1 | package eu.clarin.cmdi.oai.harvester.impl; |
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2 | |
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3 | import java.io.FilterInputStream; |
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4 | import java.io.IOException; |
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5 | import java.io.InputStream; |
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6 | import java.util.ArrayList; |
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7 | import java.util.List; |
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8 | import java.util.zip.GZIPInputStream; |
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9 | import java.util.zip.Inflater; |
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10 | import java.util.zip.InflaterInputStream; |
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11 | |
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12 | import javax.xml.namespace.NamespaceContext; |
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13 | import javax.xml.namespace.QName; |
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14 | import javax.xml.stream.Location; |
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15 | import javax.xml.stream.XMLStreamConstants; |
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16 | import javax.xml.stream.XMLStreamException; |
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17 | import javax.xml.stream.XMLStreamReader; |
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18 | import javax.xml.stream.XMLStreamWriter; |
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19 | |
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20 | import org.apache.http.HttpEntity; |
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21 | import org.apache.http.client.methods.CloseableHttpResponse; |
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22 | import org.codehaus.stax2.XMLStreamReader2; |
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23 | import org.slf4j.Logger; |
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24 | import org.slf4j.LoggerFactory; |
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25 | |
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26 | import eu.clarin.cmdi.oai.harvester.HarvesterException; |
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27 | import eu.clarin.cmdi.oai.harvester.HarvesterProtocolErrorException; |
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28 | import eu.clarin.cmdi.oai.harvester.ProtocolError; |
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29 | |
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30 | |
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31 | final class Response { |
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32 | private static final class CountingInputStream extends FilterInputStream { |
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33 | private long count = 0; |
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34 | |
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35 | |
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36 | private CountingInputStream(final InputStream stream) { |
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37 | super(stream); |
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38 | } |
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39 | |
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40 | |
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41 | @Override |
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42 | public int read() throws IOException { |
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43 | final int result = super.read(); |
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44 | count += (result > 0) ? 1 : 0; |
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45 | return result; |
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46 | } |
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47 | |
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48 | |
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49 | @Override |
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50 | public int read(byte[] buffer, int offset, int length) |
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51 | throws IOException { |
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52 | final int result = super.read(buffer, offset, length); |
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53 | count += (result > 0) ? result : 0; |
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54 | return result; |
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55 | } |
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56 | |
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57 | |
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58 | @Override |
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59 | public int read(byte[] buffer) throws IOException { |
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60 | final int result = super.read(buffer); |
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61 | count += (result > 0) ? result : 0; |
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62 | return result; |
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63 | } |
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64 | |
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65 | |
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66 | @Override |
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67 | public long skip(long n) throws IOException { |
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68 | final long result = super.skip(n); |
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69 | count += (result > 0) ? n : 0; |
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70 | return result; |
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71 | } |
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72 | |
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73 | |
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74 | public long getByteCount() { |
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75 | return count; |
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76 | } |
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77 | |
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78 | } // class CountingInputStream |
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79 | private static final String OAI_NS = "http://www.openarchives.org/OAI/2.0/"; |
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80 | private static final String ENCODING_GZIP = "gzip"; |
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81 | private static final String ENCODING_DEFLATE = "defalte"; |
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82 | private static final Logger logger = |
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83 | LoggerFactory.getLogger(Response.class); |
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84 | private final CloseableHttpResponse response; |
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85 | private final long now = System.currentTimeMillis(); |
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86 | private final CountingInputStream stream; |
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87 | private final XMLStreamReader2 reader; |
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88 | |
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89 | |
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90 | Response(HarvestJobImpl job, CloseableHttpResponse response, AbstractHarvester harvester) |
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91 | throws IOException, XMLStreamException, HarvesterException { |
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92 | if (job == null) { |
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93 | throw new NullPointerException("job == null"); |
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94 | } |
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95 | if (response == null) { |
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96 | throw new NullPointerException("response == null"); |
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97 | } |
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98 | if (harvester == null) { |
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99 | throw new NullPointerException("harvester == null"); |
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100 | } |
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101 | this.response = response; |
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102 | |
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103 | final HttpEntity entity = response.getEntity(); |
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104 | if (entity.getContentType() != null) { |
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105 | logger.debug("Content-Type: {}", entity.getContentType().getValue()); |
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106 | logger.debug("Content-Length: {}", entity.getContentLength()); |
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107 | } |
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108 | InputStream in = entity.getContent(); |
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109 | org.apache.http.Header enc = entity.getContentEncoding(); |
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110 | if (enc != null) { |
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111 | final String encoding = enc.getValue(); |
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112 | logger.debug("Content-Encoding: {}", encoding); |
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113 | if (ENCODING_GZIP.equalsIgnoreCase(encoding)) { |
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114 | in = new GZIPInputStream(in); |
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115 | } else if (ENCODING_DEFLATE.equalsIgnoreCase(encoding)) { |
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116 | in = new InflaterInputStream(in, new Inflater(true)); |
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117 | } else { |
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118 | throw new HarvesterException("Unsupported content encoding " + |
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119 | "in HTTP response: " + encoding); |
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120 | } |
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121 | } |
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122 | this.stream = new CountingInputStream(job.wrap(in)); |
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123 | this.reader = harvester.createReader(stream); |
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124 | readStart(OAI_NS, "OAI-PMH", true); |
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125 | readContent(OAI_NS, "responseDate", true); |
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126 | readStart(OAI_NS, "request", true, true); |
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127 | readEnd(OAI_NS, "request", true); |
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128 | |
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129 | List<ProtocolError> errors = null; |
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130 | while (readStart(OAI_NS, "error", false, true)) { |
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131 | if (errors == null) { |
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132 | errors = new ArrayList<ProtocolError>(); |
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133 | } |
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134 | final String code = reader.getAttributeValue(null, "code"); |
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135 | reader.next(); // skip start element after reading attrs |
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136 | final String msg = readString(true); |
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137 | readEnd(OAI_NS, "error"); |
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138 | errors.add(new ProtocolError(code, msg)); |
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139 | } |
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140 | if (errors != null) { |
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141 | throw new HarvesterProtocolErrorException(errors); |
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142 | } |
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143 | } |
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144 | |
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145 | |
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146 | public void close() throws XMLStreamException { |
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147 | readEnd(OAI_NS, "OAI-PMH"); |
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148 | } |
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149 | |
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150 | |
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151 | public void release(HarvestJobImpl job) { |
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152 | job.finishRequest(stream.getByteCount(), |
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153 | (System.currentTimeMillis() - now)); |
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154 | try { |
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155 | reader.close(); |
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156 | } catch (XMLStreamException e) { |
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157 | /* IGNORE */ |
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158 | } |
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159 | try { |
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160 | stream.close(); |
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161 | } catch (IOException e) { |
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162 | /* IGNORE */ |
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163 | } |
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164 | |
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165 | /* make sure to release allocated resources */ |
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166 | try { |
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167 | response.close(); |
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168 | } catch (IOException e) { |
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169 | /* IGNORE */ |
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170 | } |
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171 | } |
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172 | |
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173 | |
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174 | XMLStreamReader getXMLStreamReader() { |
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175 | return reader; |
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176 | } |
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177 | |
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178 | |
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179 | Location getLocation() { |
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180 | return reader.getLocation(); |
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181 | } |
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182 | |
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183 | |
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184 | boolean readStart(String namespaceURI, String localName, boolean required) |
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185 | throws XMLStreamException { |
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186 | return readStart(namespaceURI, localName, required, false); |
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187 | } |
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188 | |
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189 | |
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190 | boolean readStart(String namespaceURI, String localName, boolean required, |
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191 | boolean attributes) throws XMLStreamException { |
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192 | // System.err.println("readStart (" + localName + ", required = " + |
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193 | // required + ") @ " + toReadable(reader)); |
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194 | if (!reader.isEndElement()) { |
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195 | while (reader.hasNext()) { |
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196 | // System.err.println(" LOOP: " + dumpState()); |
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197 | if (reader.isWhiteSpace()) { |
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198 | reader.next(); |
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199 | continue; |
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200 | } |
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201 | if (reader.isStartElement()) { |
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202 | if (namespaceURI.equals(reader.getNamespaceURI()) && |
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203 | localName.equals(reader.getLocalName())) { |
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204 | // System.err.print("--> found "); |
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205 | if (!attributes) { |
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206 | // System.err.print("and consumed "); |
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207 | reader.next(); // skip to next event |
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208 | } |
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209 | // System.err.println("@ " + toReadable(reader)); |
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210 | return true; |
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211 | } |
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212 | break; |
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213 | } |
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214 | if (reader.isCharacters() || reader.isEndElement()) { |
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215 | break; |
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216 | } |
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217 | reader.next(); |
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218 | } // while |
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219 | } |
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220 | if (required) { |
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221 | // System.err.println("--> error, not found @ " + |
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222 | // toReadable(reader)); |
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223 | String what; |
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224 | if (reader.isStartElement() || reader.isEndElement() || |
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225 | reader.isEmptyElement()) { |
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226 | what = "'" + reader.getName().toString() + "'"; |
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227 | } else { |
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228 | what = "some character data"; |
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229 | } |
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230 | throw new XMLStreamException("expected element '" + |
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231 | new QName(namespaceURI, localName) + "', but found "+ |
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232 | what, reader.getLocation()); |
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233 | } |
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234 | // System.err.println("--> not found @ " + toReadable(reader)); |
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235 | return false; |
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236 | } |
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237 | |
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238 | |
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239 | void readEnd(String namespaceURI, String localName) |
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240 | throws XMLStreamException { |
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241 | readEnd(namespaceURI, localName, false); |
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242 | } |
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243 | |
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244 | |
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245 | void readEnd(String namespaceURI, String localName, boolean skipContent) |
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246 | throws XMLStreamException { |
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247 | // System.err.println("readEnd (" + localName + ") @ " + dumpState() + |
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248 | // ", skipContent = " + skipContent); |
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249 | int level = 1; |
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250 | while (reader.hasNext()) { |
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251 | // System.err.println(" LOOP " + dumpState() + " [" + |
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252 | // level + "]"); |
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253 | if (reader.isWhiteSpace()) { |
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254 | reader.next(); |
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255 | continue; |
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256 | } |
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257 | if (skipContent) { |
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258 | if (reader.isCharacters()) { |
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259 | reader.next(); |
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260 | continue; |
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261 | } |
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262 | if (reader.isStartElement()) { |
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263 | if (!(namespaceURI.equals(reader.getNamespaceURI()) && |
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264 | localName.equals(reader.getLocalName()))) { |
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265 | level++; |
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266 | } |
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267 | reader.next(); |
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268 | continue; |
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269 | } |
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270 | } |
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271 | if (reader.isEndElement()) { |
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272 | level--; |
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273 | // System.err.println(" @END-TAG: " + dumpState() + " [" + |
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274 | // level + "]"); |
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275 | if (level == 0) { |
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276 | if (namespaceURI.equals(reader.getNamespaceURI()) && |
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277 | localName.equals(reader.getLocalName())) { |
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278 | reader.next(); // consume tag |
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279 | break; |
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280 | } else { |
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281 | String what; |
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282 | if (reader.isStartElement() || reader.isEndElement() || |
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283 | reader.isEmptyElement()) { |
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284 | what = "'" + reader.getName().toString() + "'"; |
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285 | } else { |
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286 | what = "some character data"; |
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287 | } |
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288 | throw new XMLStreamException("expected end tag for '" + |
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289 | new QName(namespaceURI, localName) + |
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290 | "', but found " + what, |
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291 | reader.getLocation()); |
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292 | } |
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293 | } |
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294 | } |
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295 | reader.next(); |
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296 | } |
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297 | // System.err.println("--> ok @ " + dumpState()); |
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298 | } |
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299 | |
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300 | |
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301 | boolean peekStart(String namespaceURI, String localName) |
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302 | throws XMLStreamException { |
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303 | if (reader.isWhiteSpace()) { |
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304 | consumeWhitespace(); |
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305 | } |
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306 | if (!reader.isStartElement()) { |
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307 | return false; |
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308 | } |
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309 | return namespaceURI.equals(reader.getNamespaceURI()) && |
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310 | localName.equals(reader.getLocalName()); |
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311 | } |
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312 | |
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313 | |
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314 | String readContent(String namespaceURI, String localName, boolean required) |
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315 | throws XMLStreamException { |
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316 | return readContent(namespaceURI, localName, required, true); |
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317 | } |
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318 | |
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319 | |
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320 | String readContent(String namespaceURI, String localName, boolean required, |
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321 | boolean contentRequired) throws XMLStreamException { |
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322 | String result = null; |
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323 | if (readStart(namespaceURI, localName, required)) { |
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324 | try { |
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325 | result = readString(contentRequired); |
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326 | if (!contentRequired && (result == null)) { |
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327 | result = ""; |
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328 | } |
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329 | } catch (XMLStreamException e) { |
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330 | StringBuilder sb = new StringBuilder(); |
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331 | sb.append("element '"); |
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332 | sb.append(new QName(namespaceURI, localName)); |
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333 | sb.append("' may not be empty"); |
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334 | throw new XMLStreamException(sb.toString(), e.getLocation()); |
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335 | } |
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336 | readEnd(namespaceURI, localName); |
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337 | } |
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338 | return result; |
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339 | } |
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340 | |
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341 | |
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342 | int readContent(String namespaceURI, String localName, boolean required, |
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343 | int defaultValue) throws XMLStreamException { |
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344 | if (readStart(namespaceURI, localName, required)) { |
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345 | String s = readString(true); |
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346 | try { |
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347 | readEnd(namespaceURI, localName); |
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348 | } catch (XMLStreamException e) { |
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349 | StringBuilder sb = new StringBuilder(); |
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350 | sb.append("element '"); |
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351 | sb.append(new QName(namespaceURI, localName)); |
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352 | sb.append(localName).append("' may not be empty"); |
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353 | throw new XMLStreamException(sb.toString(), e.getLocation()); |
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354 | } |
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355 | try { |
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356 | return Integer.parseInt(s); |
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357 | } catch (NumberFormatException e) { |
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358 | StringBuilder sb = new StringBuilder(); |
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359 | sb.append("element '"); |
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360 | sb.append(new QName(namespaceURI, localName)); |
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361 | sb.append("' was expected to be of type xs:integer; "); |
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362 | sb.append("incompatible value was: "); |
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363 | sb.append(s); |
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364 | throw new XMLStreamException(sb.toString(), |
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365 | reader.getLocation(), e); |
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366 | } |
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367 | } |
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368 | return defaultValue; |
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369 | } |
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370 | |
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371 | |
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372 | String readString(boolean required) throws XMLStreamException { |
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373 | // System.err.println("readString @ " + toReadable(reader)); |
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374 | StringBuilder sb = new StringBuilder(); |
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375 | while (reader.isCharacters()) { |
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376 | String s = reader.getText(); |
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377 | if ((s != null) && !s.isEmpty()) { |
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378 | sb.append(s); |
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379 | } |
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380 | if (!reader.hasNext()) { |
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381 | break; |
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382 | } |
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383 | reader.next(); |
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384 | } // while |
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385 | String s = null; |
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386 | if (sb.length() > 0) { |
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387 | s = sb.toString().trim(); |
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388 | } |
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389 | if (required && ((s == null) || s.isEmpty())) { |
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390 | throw new XMLStreamException("expected character content " |
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391 | + "at position ", reader.getLocation()); |
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392 | } |
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393 | // System.err.println("--> ok @ " + toReadable(reader)); |
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394 | return s; |
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395 | } |
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396 | |
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397 | |
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398 | String readAttributeValue(String namespaceURI, String localName) |
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399 | throws XMLStreamException { |
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400 | if (!reader.isStartElement()) { |
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401 | throw new XMLStreamException("not at a start elment event", |
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402 | reader.getLocation()); |
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403 | } |
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404 | String attr = reader.getAttributeValue(namespaceURI, localName); |
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405 | if (attr != null) { |
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406 | attr = attr.trim().intern(); |
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407 | } |
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408 | return attr; |
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409 | } |
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410 | |
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411 | |
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412 | String readNamespaceURI() throws XMLStreamException { |
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413 | if (!reader.isStartElement()) { |
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414 | throw new XMLStreamException("not at a start elment event", |
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415 | reader.getLocation()); |
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416 | } |
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417 | return reader.getNamespaceURI(); |
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418 | } |
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419 | |
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420 | |
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421 | String peekElementLocalName() throws XMLStreamException { |
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422 | if (!reader.isStartElement()) { |
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423 | throw new XMLStreamException("not at a start elment event", |
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424 | reader.getLocation()); |
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425 | } |
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426 | return reader.getLocalName(); |
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427 | } |
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428 | |
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429 | |
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430 | void consumeStart() throws XMLStreamException { |
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431 | if (!reader.isStartElement()) { |
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432 | throw new XMLStreamException("not at a start elment event", |
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433 | reader.getLocation()); |
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434 | } |
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435 | reader.next(); |
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436 | } |
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437 | |
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438 | |
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439 | void consumeWhitespace() throws XMLStreamException { |
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440 | outer: |
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441 | while (reader.hasNext()) { |
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442 | /* |
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443 | * some hackish method to also skip stray UTF-8 BOMs; only works |
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444 | * where whitespace is expected |
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445 | */ |
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446 | if (reader.isCharacters()) { |
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447 | final char buffer[] = reader.getTextCharacters(); |
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448 | final int end = reader.getTextStart() + reader.getTextLength(); |
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449 | for (int i = reader.getTextStart(); i < end; i++) { |
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450 | if (!(Character.isWhitespace(buffer[i]) || |
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451 | (buffer[i] == 0x0FEFF))) { |
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452 | break outer; |
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453 | } |
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454 | } |
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455 | } else if (!reader.isWhiteSpace()) { |
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456 | break outer; |
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457 | } |
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458 | reader.next(); |
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459 | } // while |
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460 | } |
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461 | |
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462 | |
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463 | void copyTo(XMLStreamWriter writer) throws XMLStreamException { |
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464 | final int depth = reader.getDepth(); |
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465 | do { |
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466 | copyEvent(reader, writer); |
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467 | reader.next(); |
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468 | } while (reader.getDepth() >= depth); |
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469 | } |
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470 | |
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471 | |
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472 | private static void copyEvent(XMLStreamReader from, XMLStreamWriter to) |
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473 | throws XMLStreamException { |
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474 | switch (from.getEventType()) { |
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475 | case XMLStreamConstants.START_DOCUMENT: |
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476 | { |
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477 | String version = from.getVersion(); |
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478 | if (version == null || version.length() == 0) { |
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479 | to.writeStartDocument(); |
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480 | } else { |
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481 | to.writeStartDocument(from.getCharacterEncodingScheme(), |
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482 | from.getVersion()); |
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483 | } |
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484 | to.writeCharacters("\n"); |
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485 | } |
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486 | return; |
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487 | |
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488 | case XMLStreamConstants.END_DOCUMENT: |
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489 | to.writeCharacters("\n"); |
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490 | to.writeEndDocument(); |
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491 | return; |
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492 | |
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493 | case XMLStreamConstants.START_ELEMENT: |
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494 | copyStartElement(from, to); |
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495 | return; |
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496 | |
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497 | case XMLStreamConstants.END_ELEMENT: |
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498 | to.writeEndElement(); |
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499 | return; |
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500 | |
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501 | case XMLStreamConstants.SPACE: |
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502 | to.writeCharacters(from.getTextCharacters(), from.getTextStart(), |
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503 | from.getTextLength()); |
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504 | return; |
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505 | |
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506 | case XMLStreamConstants.CDATA: |
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507 | to.writeCData(from.getText()); |
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508 | return; |
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509 | |
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510 | case XMLStreamConstants.CHARACTERS: |
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511 | to.writeCharacters(from.getTextCharacters(), from.getTextStart(), |
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512 | from.getTextLength()); |
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513 | return; |
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514 | |
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515 | case XMLStreamConstants.COMMENT: |
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516 | to.writeComment(from.getText()); |
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517 | return; |
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518 | |
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519 | case XMLStreamConstants.PROCESSING_INSTRUCTION: |
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520 | to.writeProcessingInstruction(from.getPITarget(), from.getPIData()); |
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521 | return; |
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522 | |
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523 | case XMLStreamConstants.DTD: |
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524 | case XMLStreamConstants.ENTITY_REFERENCE: |
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525 | case XMLStreamConstants.ATTRIBUTE: |
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526 | case XMLStreamConstants.NAMESPACE: |
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527 | case XMLStreamConstants.ENTITY_DECLARATION: |
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528 | case XMLStreamConstants.NOTATION_DECLARATION: |
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529 | /* FALL_TROUGH */ |
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530 | } |
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531 | throw new XMLStreamException("unsupported event type: " + |
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532 | from.getEventType()); |
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533 | } |
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534 | |
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535 | |
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536 | private static void copyStartElement(XMLStreamReader from, |
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537 | XMLStreamWriter to) throws XMLStreamException { |
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538 | final int nsCount = from.getNamespaceCount(); |
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539 | if (nsCount > 0) { // yup, got some... |
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540 | for (int i = 0; i < nsCount; ++i) { |
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541 | String pfx = from.getNamespacePrefix(i); |
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542 | String uri = from.getNamespaceURI(i); |
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543 | if ((pfx == null) || pfx.isEmpty()) { // default NS |
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544 | to.setDefaultNamespace(uri); |
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545 | } else { |
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546 | to.setPrefix(pfx, uri); |
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547 | } |
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548 | } |
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549 | } |
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550 | |
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551 | final String prefix = from.getPrefix(); |
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552 | final NamespaceContext from_ctx = from.getNamespaceContext(); |
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553 | final NamespaceContext to_ctx = to.getNamespaceContext(); |
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554 | boolean repair_prefix_namespace = false; |
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555 | if ((prefix != null) && (to_ctx.getNamespaceURI(prefix) == null)) { |
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556 | repair_prefix_namespace = true; |
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557 | to.setPrefix(prefix, from_ctx.getNamespaceURI(prefix)); |
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558 | } |
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559 | |
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560 | to.writeStartElement(prefix, from.getLocalName(), |
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561 | from.getNamespaceURI()); |
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562 | |
---|
563 | if (nsCount > 0) { |
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564 | // write namespace declarations |
---|
565 | for (int i = 0; i < nsCount; ++i) { |
---|
566 | String pfx = from.getNamespacePrefix(i); |
---|
567 | String uri = from.getNamespaceURI(i); |
---|
568 | |
---|
569 | if ((pfx == null) || pfx.isEmpty()) { // default NS |
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570 | to.writeDefaultNamespace(uri); |
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571 | } else { |
---|
572 | to.writeNamespace(pfx, uri); |
---|
573 | } |
---|
574 | } |
---|
575 | } |
---|
576 | if (repair_prefix_namespace) { |
---|
577 | to.writeNamespace(prefix, from_ctx.getNamespaceURI(prefix)); |
---|
578 | } |
---|
579 | |
---|
580 | int attrCount = from.getAttributeCount(); |
---|
581 | if (attrCount > 0) { |
---|
582 | for (int i = 0; i < attrCount; ++i) { |
---|
583 | to.writeAttribute(from.getAttributePrefix(i), |
---|
584 | from.getAttributeNamespace(i), |
---|
585 | from.getAttributeLocalName(i), |
---|
586 | from.getAttributeValue(i)); |
---|
587 | } |
---|
588 | } |
---|
589 | } |
---|
590 | |
---|
591 | |
---|
592 | String dumpState() { |
---|
593 | StringBuilder sb = new StringBuilder(); |
---|
594 | switch (reader.getEventType()) { |
---|
595 | case XMLStreamConstants.START_DOCUMENT: |
---|
596 | return "START_DOC["; |
---|
597 | case XMLStreamConstants.END_DOCUMENT: |
---|
598 | return "END_DOC["; |
---|
599 | case XMLStreamConstants.START_ELEMENT: |
---|
600 | sb.append("START["); |
---|
601 | sb.append(reader.getNamespaceURI()); |
---|
602 | sb.append(","); |
---|
603 | sb.append(reader.getLocalName()); |
---|
604 | break; |
---|
605 | case XMLStreamConstants.END_ELEMENT: |
---|
606 | sb.append("END["); |
---|
607 | sb.append(reader.getNamespaceURI()); |
---|
608 | sb.append(","); |
---|
609 | sb.append(reader.getLocalName()); |
---|
610 | break; |
---|
611 | case XMLStreamConstants.CHARACTERS: |
---|
612 | sb.append("CHARACTERS[\""); |
---|
613 | sb.append(reader.getText() |
---|
614 | .replace("\n", "\\n") |
---|
615 | .replace("\r", "\\r") |
---|
616 | .replace("\t", "\\t")); |
---|
617 | sb.append("\", isWhitespace = "); |
---|
618 | sb.append(reader.isWhiteSpace()); |
---|
619 | break; |
---|
620 | case XMLStreamConstants.CDATA: |
---|
621 | sb.append("CDATA[\""); |
---|
622 | sb.append(reader.getText().replace("\n", "\\n") |
---|
623 | .replace("\r", "\\r").replace("\t", "\\t")); |
---|
624 | sb.append("\", isWhitespace = "); |
---|
625 | sb.append(reader.isWhiteSpace()); |
---|
626 | break; |
---|
627 | default: |
---|
628 | sb.append(Integer.toString(reader.getEventType())); |
---|
629 | } |
---|
630 | Location location = reader.getLocation(); |
---|
631 | sb.append(", row = ").append(location.getLineNumber()); |
---|
632 | sb.append(", col = ").append(location.getColumnNumber()); |
---|
633 | sb.append(", offset = ").append(location.getCharacterOffset()); |
---|
634 | sb.append("]"); |
---|
635 | return sb.toString(); |
---|
636 | } |
---|
637 | |
---|
638 | } // class XmlStreamReaderWrapper |
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