1 | package eu.clarin.sru.client; |
---|
2 | |
---|
3 | import javax.xml.namespace.QName; |
---|
4 | import javax.xml.stream.XMLStreamException; |
---|
5 | import javax.xml.stream.XMLStreamReader; |
---|
6 | |
---|
7 | public final class XmlStreamReaderUtils { |
---|
8 | private XmlStreamReaderUtils() { |
---|
9 | } |
---|
10 | |
---|
11 | public static boolean readStart(XMLStreamReader reader, String namespaceURI, String localName, boolean required) |
---|
12 | throws XMLStreamException { |
---|
13 | return readStart(reader, namespaceURI, localName, required, false); |
---|
14 | } |
---|
15 | |
---|
16 | |
---|
17 | public static boolean readStart(XMLStreamReader reader, String namespaceURI, String localName, boolean required, |
---|
18 | boolean attributes) throws XMLStreamException { |
---|
19 | // System.err.println("readStart (" + localName + ", required = " + |
---|
20 | // required + ") @ " + toReadable(reader)); |
---|
21 | if (!reader.isEndElement()) { |
---|
22 | while (reader.hasNext()) { |
---|
23 | // System.err.println(" LOOP: " + dumpState()); |
---|
24 | if (reader.isWhiteSpace()) { |
---|
25 | reader.next(); |
---|
26 | continue; |
---|
27 | } |
---|
28 | if (reader.isStartElement()) { |
---|
29 | if (namespaceURI.equals(reader.getNamespaceURI()) && |
---|
30 | localName.equals(reader.getLocalName())) { |
---|
31 | // System.err.print("--> found "); |
---|
32 | if (!attributes) { |
---|
33 | // System.err.print("and consumed "); |
---|
34 | reader.next(); // skip to next event |
---|
35 | } |
---|
36 | // System.err.println("@ " + toReadable(reader)); |
---|
37 | return true; |
---|
38 | } |
---|
39 | break; |
---|
40 | } |
---|
41 | if (reader.isCharacters() || reader.isEndElement()) { |
---|
42 | break; |
---|
43 | } |
---|
44 | reader.next(); |
---|
45 | } // while |
---|
46 | } |
---|
47 | if (required) { |
---|
48 | // System.err.println("--> error, not found @ " + |
---|
49 | // toReadable(reader)); |
---|
50 | throw new XMLStreamException("expected element '" + |
---|
51 | new QName(namespaceURI, localName) + "', but found '" + |
---|
52 | reader.getName() + "'", reader.getLocation()); |
---|
53 | } |
---|
54 | // System.err.println("--> not found @ " + toReadable(reader)); |
---|
55 | return false; |
---|
56 | } |
---|
57 | |
---|
58 | |
---|
59 | public static void readEnd(XMLStreamReader reader, String namespaceURI, String localName) |
---|
60 | throws XMLStreamException { |
---|
61 | readEnd(reader, namespaceURI, localName, false); |
---|
62 | } |
---|
63 | |
---|
64 | |
---|
65 | public static void readEnd(XMLStreamReader reader, String namespaceURI, String localName, boolean skipContent) |
---|
66 | throws XMLStreamException { |
---|
67 | // System.err.println("readEnd (" + localName + ") @ " + dumpState() + |
---|
68 | // ", skipContent = " + skipContent); |
---|
69 | int level = 1; |
---|
70 | while (reader.hasNext()) { |
---|
71 | // System.err.println(" LOOP " + dumpState() + " [" + |
---|
72 | // level + "]"); |
---|
73 | if (reader.isWhiteSpace()) { |
---|
74 | reader.next(); |
---|
75 | continue; |
---|
76 | } |
---|
77 | if (skipContent) { |
---|
78 | if (reader.isCharacters()) { |
---|
79 | reader.next(); |
---|
80 | continue; |
---|
81 | } |
---|
82 | if (reader.isStartElement()) { |
---|
83 | if (!(namespaceURI.equals(reader.getNamespaceURI()) && localName |
---|
84 | .equals(reader.getLocalName()))) { |
---|
85 | level++; |
---|
86 | } |
---|
87 | reader.next(); |
---|
88 | continue; |
---|
89 | } |
---|
90 | } |
---|
91 | if (reader.isEndElement()) { |
---|
92 | level--; |
---|
93 | // System.err.println(" @END-TAG: " + dumpState() + " [" + |
---|
94 | // level + "]"); |
---|
95 | if (level == 0) { |
---|
96 | if (namespaceURI.equals(reader.getNamespaceURI()) && |
---|
97 | localName.equals(reader.getLocalName())) { |
---|
98 | reader.next(); // consume tag |
---|
99 | break; |
---|
100 | } else { |
---|
101 | throw new XMLStreamException("expected end tag for '" + |
---|
102 | new QName(namespaceURI, localName) + |
---|
103 | "', but found '" + reader.getName() + "'", |
---|
104 | reader.getLocation()); |
---|
105 | } |
---|
106 | } |
---|
107 | } |
---|
108 | reader.next(); |
---|
109 | } |
---|
110 | // System.err.println("--> ok @ " + dumpState()); |
---|
111 | } |
---|
112 | |
---|
113 | |
---|
114 | public static String readContent(XMLStreamReader reader, String namespaceURI, String localName, boolean required) |
---|
115 | throws XMLStreamException { |
---|
116 | String result = null; |
---|
117 | if (readStart(reader, namespaceURI, localName, required)) { |
---|
118 | result = readString(reader, true); |
---|
119 | readEnd(reader, namespaceURI, localName); |
---|
120 | } |
---|
121 | return result; |
---|
122 | } |
---|
123 | |
---|
124 | |
---|
125 | public static int readContent(XMLStreamReader reader, String namespaceURI, String localName, boolean required, |
---|
126 | int defaultValue) throws XMLStreamException { |
---|
127 | if (readStart(reader, namespaceURI, localName, required)) { |
---|
128 | String s = readString(reader, true); |
---|
129 | readEnd(reader, namespaceURI, localName); |
---|
130 | try { |
---|
131 | return Integer.parseInt(s); |
---|
132 | } catch (NumberFormatException e) { |
---|
133 | throw new XMLStreamException( |
---|
134 | "expected a xs:integer value: s", e); |
---|
135 | } |
---|
136 | } |
---|
137 | return defaultValue; |
---|
138 | } |
---|
139 | |
---|
140 | |
---|
141 | public static String readString(XMLStreamReader reader, boolean required) throws XMLStreamException { |
---|
142 | // System.err.println("readString @ " + toReadable(reader)); |
---|
143 | String s = null; |
---|
144 | if (reader.isCharacters()) { |
---|
145 | s = reader.getText(); |
---|
146 | if (s != null) { |
---|
147 | s = s.trim(); |
---|
148 | } |
---|
149 | reader.next(); |
---|
150 | } |
---|
151 | if (required && ((s == null) || s.isEmpty())) { |
---|
152 | throw new XMLStreamException("expected character content " |
---|
153 | + "at position", reader.getLocation()); |
---|
154 | } |
---|
155 | // System.err.println("--> ok @ " + toReadable(reader)); |
---|
156 | return s; |
---|
157 | } |
---|
158 | |
---|
159 | |
---|
160 | public static String readAttributeValue(XMLStreamReader reader, String namespaceURI, String localName) |
---|
161 | throws XMLStreamException { |
---|
162 | if (!reader.isStartElement()) { |
---|
163 | throw new XMLStreamException("not at a start elment event", |
---|
164 | reader.getLocation()); |
---|
165 | } |
---|
166 | String attr = reader.getAttributeValue(namespaceURI, localName); |
---|
167 | if (attr != null) { |
---|
168 | attr = attr.trim().intern(); |
---|
169 | } |
---|
170 | return attr; |
---|
171 | } |
---|
172 | |
---|
173 | |
---|
174 | public static String readNamespaceURI(XMLStreamReader reader) throws XMLStreamException { |
---|
175 | if (!reader.isStartElement()) { |
---|
176 | throw new XMLStreamException("not at a start elment event", |
---|
177 | reader.getLocation()); |
---|
178 | } |
---|
179 | return reader.getNamespaceURI(); |
---|
180 | } |
---|
181 | |
---|
182 | |
---|
183 | public static String peekElementLocalName(XMLStreamReader reader) throws XMLStreamException { |
---|
184 | if (!reader.isStartElement()) { |
---|
185 | throw new XMLStreamException("not at a start elment event", |
---|
186 | reader.getLocation()); |
---|
187 | } |
---|
188 | return reader.getLocalName(); |
---|
189 | } |
---|
190 | |
---|
191 | |
---|
192 | public static void consumeStart(XMLStreamReader reader) throws XMLStreamException { |
---|
193 | if (!reader.isStartElement()) { |
---|
194 | throw new XMLStreamException("not at a start elment event", |
---|
195 | reader.getLocation()); |
---|
196 | } |
---|
197 | reader.next(); |
---|
198 | } |
---|
199 | |
---|
200 | |
---|
201 | public static void consumeWhitespace(XMLStreamReader reader) throws XMLStreamException { |
---|
202 | while (reader.isWhiteSpace() && reader.hasNext()) { |
---|
203 | reader.next(); |
---|
204 | continue; |
---|
205 | } |
---|
206 | } |
---|
207 | |
---|
208 | } // class XmlStreamReaderUtils |
---|