1 | package eu.clarin.cmdi.virtualcollectionregistry; |
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2 | |
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3 | import java.security.Principal; |
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4 | import java.util.Collections; |
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5 | import java.util.List; |
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6 | import java.util.Map; |
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7 | import java.util.concurrent.atomic.AtomicBoolean; |
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8 | |
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9 | import javax.persistence.EntityManager; |
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10 | import javax.persistence.NoResultException; |
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11 | import javax.persistence.TypedQuery; |
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12 | |
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13 | import org.slf4j.Logger; |
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14 | import org.slf4j.LoggerFactory; |
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15 | |
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16 | import eu.clarin.cmdi.virtualcollectionregistry.model.InternalPersistentIdentifierProvider; |
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17 | import eu.clarin.cmdi.virtualcollectionregistry.model.PersistentIdentifier; |
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18 | import eu.clarin.cmdi.virtualcollectionregistry.model.PersistentIdentifierProvider; |
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19 | import eu.clarin.cmdi.virtualcollectionregistry.model.User; |
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20 | import eu.clarin.cmdi.virtualcollectionregistry.model.VirtualCollection; |
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21 | import eu.clarin.cmdi.virtualcollectionregistry.model.VirtualCollectionList; |
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22 | import eu.clarin.cmdi.virtualcollectionregistry.model.VirtualCollectionValidator; |
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23 | import eu.clarin.cmdi.virtualcollectionregistry.query.ParsedQuery; |
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24 | import eu.clarin.cmdi.virtualcollectionregistry.query.QueryException; |
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25 | |
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26 | public class VirtualCollectionRegistry { |
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27 | private static final Logger logger = |
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28 | LoggerFactory.getLogger(VirtualCollectionRegistry.class); |
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29 | private static final VirtualCollectionRegistry s_instance = |
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30 | new VirtualCollectionRegistry(); |
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31 | private AtomicBoolean intialized = new AtomicBoolean(false); |
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32 | private DataStore datastore = null; |
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33 | private PersistentIdentifierProvider pid_provider = null; |
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34 | private VirtualCollectionRegistryMarshaller marshaller = null; |
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35 | |
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36 | private VirtualCollectionRegistry() { |
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37 | super(); |
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38 | } |
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39 | |
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40 | public static void initalize(Map<String, String> config) |
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41 | throws VirtualCollectionRegistryException { |
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42 | s_instance.doInitalize(config); |
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43 | } |
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44 | |
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45 | private void doInitalize(Map<String, String> config) |
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46 | throws VirtualCollectionRegistryException { |
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47 | if (intialized.get()) { |
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48 | throw new VirtualCollectionRegistryException("already initialized"); |
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49 | } |
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50 | logger.debug("initializing virtual collection registry ..."); |
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51 | if (config != null) { |
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52 | config = Collections.unmodifiableMap(config); |
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53 | } else { |
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54 | config = Collections.emptyMap(); |
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55 | } |
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56 | this.datastore = new DataStore(config); |
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57 | this.pid_provider = new InternalPersistentIdentifierProvider(config); |
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58 | this.marshaller = new VirtualCollectionRegistryMarshaller(); |
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59 | this.intialized.set(true); |
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60 | logger.info("virtual collection registry successfully intialized"); |
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61 | } |
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62 | |
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63 | public void destroy() throws VirtualCollectionRegistryException { |
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64 | if (datastore != null) { |
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65 | datastore.destroy(); |
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66 | } |
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67 | } |
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68 | |
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69 | public static VirtualCollectionRegistry instance() { |
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70 | if (!s_instance.intialized.get()) { |
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71 | throw new InternalError("virtual collection registry failed " + |
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72 | "to initialize correctly"); |
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73 | } |
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74 | return s_instance; |
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75 | } |
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76 | |
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77 | public DataStore getDataStore() { |
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78 | return datastore; |
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79 | } |
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80 | |
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81 | public VirtualCollectionRegistryMarshaller getMarshaller() { |
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82 | return marshaller; |
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83 | } |
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84 | |
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85 | public long createVirtualCollection(Principal principal, |
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86 | VirtualCollection vc) throws VirtualCollectionRegistryException { |
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87 | if (principal == null) { |
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88 | throw new NullPointerException("principal == null"); |
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89 | } |
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90 | if (vc == null) { |
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91 | throw new NullPointerException("vc == null"); |
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92 | } |
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93 | |
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94 | logger.debug("creating virtual collection"); |
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95 | |
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96 | VirtualCollectionValidator validator = |
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97 | new VirtualCollectionValidator(); |
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98 | validator.validate(vc); |
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99 | |
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100 | try { |
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101 | EntityManager em = datastore.getEntityManager(); |
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102 | em.getTransaction().begin(); |
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103 | |
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104 | // fetch user, if user does not exist create new |
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105 | User user = fetchUser(em, principal); |
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106 | if (user == null) { |
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107 | user = new User(principal.getName()); |
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108 | em.persist(user); |
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109 | } |
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110 | |
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111 | // store virtual collection |
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112 | vc.setOwner(user); |
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113 | vc.createUUID(); |
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114 | em.persist(vc); |
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115 | em.getTransaction().commit(); |
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116 | |
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117 | PersistentIdentifier pid = |
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118 | pid_provider.createPersistentIdentifier(vc); |
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119 | em.getTransaction().begin(); |
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120 | em.persist(pid); |
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121 | em.getTransaction().commit(); |
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122 | logger.debug("created virtual collection (id={}, pid={})", |
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123 | vc.getId(), pid.getIdentifier()); |
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124 | return vc.getId(); |
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125 | } catch (VirtualCollectionRegistryException e) { |
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126 | logger.debug("failed creating virtual collecion: {}", |
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127 | e.getMessage()); |
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128 | throw e; |
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129 | } catch (Exception e) { |
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130 | logger.error("error while creating virtual collection", e); |
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131 | throw new VirtualCollectionRegistryException( |
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132 | "error while creating virtual collection", e); |
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133 | } |
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134 | } |
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135 | |
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136 | public long updateVirtualCollection(Principal principal, long id, |
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137 | VirtualCollection vc) throws VirtualCollectionRegistryException { |
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138 | if (principal == null) { |
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139 | throw new NullPointerException("principal == null"); |
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140 | } |
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141 | if (id <= 0) { |
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142 | throw new IllegalArgumentException("id <= 0"); |
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143 | } |
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144 | if (vc == null) { |
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145 | throw new NullPointerException("vc == null"); |
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146 | } |
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147 | |
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148 | logger.debug("updating virtual collection (id={})", id); |
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149 | |
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150 | VirtualCollectionValidator validator = |
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151 | new VirtualCollectionValidator(); |
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152 | validator.validate(vc); |
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153 | |
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154 | try { |
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155 | EntityManager em = datastore.getEntityManager(); |
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156 | em.getTransaction().begin(); |
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157 | VirtualCollection c = em.find(VirtualCollection.class, new Long(id)); |
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158 | if (c == null) { |
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159 | throw new VirtualCollectionNotFoundException(id); |
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160 | } |
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161 | if (!c.getOwner().equalsPrincipal(principal)) { |
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162 | throw new VirtualCollectionRegistryPermissionException( |
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163 | "permission denied for user \"" + |
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164 | principal.getName() + "\""); |
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165 | } |
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166 | c.updateFrom(vc); |
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167 | validator.validate(c); |
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168 | em.getTransaction().commit(); |
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169 | logger.debug("updated virtual collection (id={})", vc.getId()); |
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170 | return vc.getId(); |
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171 | } catch (VirtualCollectionRegistryException e) { |
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172 | logger.debug("failed updating virtual collecion (id={}): {}", |
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173 | id, e.getMessage()); |
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174 | throw e; |
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175 | } catch (Exception e) { |
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176 | logger.error("error while updating virtual collection", e); |
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177 | throw new VirtualCollectionRegistryException( |
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178 | "error while updating virtual collection", e); |
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179 | } |
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180 | } |
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181 | |
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182 | public long deleteVirtualCollection(Principal principal, long id) |
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183 | throws VirtualCollectionRegistryException { |
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184 | if (principal == null) { |
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185 | throw new NullPointerException("principal == null"); |
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186 | } |
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187 | if (id <= 0) { |
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188 | throw new IllegalArgumentException("id <= 0"); |
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189 | } |
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190 | |
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191 | logger.debug("deleting virtual collection (id={})", id); |
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192 | |
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193 | try { |
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194 | EntityManager em = datastore.getEntityManager(); |
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195 | em.getTransaction().begin(); |
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196 | VirtualCollection vc = em.find(VirtualCollection.class, new Long(id)); |
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197 | if (vc == null) { |
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198 | logger.debug("virtual collection (id={}) not found", id); |
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199 | throw new VirtualCollectionNotFoundException(id); |
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200 | } |
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201 | if (!vc.getOwner().equalsPrincipal(principal)) { |
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202 | throw new VirtualCollectionRegistryPermissionException( |
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203 | "permission denied for user \"" + |
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204 | principal.getName() + "\""); |
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205 | } |
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206 | em.remove(vc); |
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207 | em.getTransaction().commit(); |
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208 | return vc.getId(); |
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209 | } catch (VirtualCollectionRegistryException e) { |
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210 | logger.debug("failed deleting virtual collecion (id={}): {}", |
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211 | id, e.getMessage()); |
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212 | throw e; |
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213 | } catch (Exception e) { |
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214 | logger.error("error while deleting virtual collection", e); |
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215 | throw new VirtualCollectionRegistryException( |
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216 | "error while deleting virtual collection", e); |
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217 | } |
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218 | } |
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219 | |
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220 | public VirtualCollection retrieveVirtualCollection(long id) |
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221 | throws VirtualCollectionRegistryException { |
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222 | if (id <= 0) { |
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223 | throw new IllegalArgumentException("id <= 0"); |
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224 | } |
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225 | |
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226 | logger.debug("retrieve virtual collection (id={})", id); |
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227 | |
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228 | try { |
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229 | EntityManager em = datastore.getEntityManager(); |
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230 | em.getTransaction().begin(); |
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231 | VirtualCollection vc = em.find(VirtualCollection.class, |
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232 | new Long(id)); |
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233 | em.getTransaction().commit(); |
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234 | if (vc == null) { |
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235 | logger.debug("virtual collection (id={}) not found", id); |
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236 | throw new VirtualCollectionNotFoundException(id); |
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237 | } |
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238 | return vc; |
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239 | } catch (VirtualCollectionRegistryException e) { |
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240 | throw e; |
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241 | } catch (Exception e) { |
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242 | logger.error("error while retrieving virtual collection", e); |
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243 | throw new VirtualCollectionRegistryException( |
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244 | "error while retrieving virtual collection", e); |
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245 | } |
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246 | } |
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247 | |
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248 | public VirtualCollection retrieveVirtualCollection(String uuid) |
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249 | throws VirtualCollectionRegistryException { |
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250 | if (uuid == null) { |
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251 | throw new NullPointerException("uuid == null"); |
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252 | } |
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253 | uuid = uuid.trim(); |
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254 | if (uuid.isEmpty()) { |
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255 | throw new IllegalArgumentException("uuid is empty"); |
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256 | } |
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257 | |
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258 | logger.debug("retrieve virtual collection (uuid={})", uuid); |
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259 | |
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260 | try { |
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261 | EntityManager em = datastore.getEntityManager(); |
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262 | em.getTransaction().begin(); |
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263 | TypedQuery<VirtualCollection> q = |
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264 | em.createNamedQuery("VirtualCollection.byUUID", |
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265 | VirtualCollection.class); |
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266 | q.setParameter("uuid", uuid); |
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267 | VirtualCollection vc = q.getSingleResult(); |
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268 | em.getTransaction().commit(); |
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269 | return vc; |
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270 | } catch (NoResultException e) { |
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271 | logger.debug("virtual collection (uuid={}) not found", uuid); |
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272 | throw new VirtualCollectionNotFoundException(uuid); |
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273 | } catch (Exception e) { |
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274 | logger.error("error while retrieving virtual collection", e); |
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275 | throw new VirtualCollectionRegistryException( |
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276 | "error while retrieving virtual collection", e); |
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277 | } |
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278 | } |
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279 | |
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280 | public VirtualCollectionList getVirtualCollections(String query, |
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281 | int offset, int count) throws VirtualCollectionRegistryException { |
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282 | EntityManager em = datastore.getEntityManager(); |
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283 | try { |
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284 | em.getTransaction().begin(); |
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285 | |
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286 | // setup queries |
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287 | TypedQuery<Long> cq = null; |
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288 | TypedQuery<VirtualCollection> q = null; |
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289 | if (query != null) { |
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290 | ParsedQuery parsedQuery = ParsedQuery.parseQuery(em, query); |
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291 | cq = parsedQuery.getCountQuery(null); |
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292 | q = parsedQuery.getQuery(null); |
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293 | } else { |
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294 | cq = em.createNamedQuery("VirtualCollection.countAll", |
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295 | Long.class); |
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296 | q = em.createNamedQuery("VirtualCollection.findAll", |
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297 | VirtualCollection.class); |
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298 | } |
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299 | |
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300 | // commence query ... |
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301 | List<VirtualCollection> results = null; |
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302 | long totalCount = cq.getSingleResult(); |
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303 | |
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304 | // optimization; don't query, if we won't get any results |
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305 | if ( totalCount > 0) { |
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306 | if (offset > 0) { |
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307 | q.setFirstResult(offset); |
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308 | } |
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309 | if (count > 0) { |
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310 | q.setMaxResults(count); |
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311 | } |
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312 | results = q.getResultList(); |
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313 | } |
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314 | return new VirtualCollectionList(results, offset, (int) totalCount); |
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315 | } catch (QueryException e) { |
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316 | throw new VirtualCollectionRegistryUsageException( |
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317 | "query invalid", e); |
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318 | } catch (Exception e) { |
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319 | logger.error("error while enumerating virtual collections", e); |
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320 | throw new VirtualCollectionRegistryException( |
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321 | "error while enumerating virtual collections", e); |
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322 | } finally { |
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323 | em.getTransaction().commit(); |
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324 | } |
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325 | } |
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326 | |
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327 | public VirtualCollectionList getVirtualCollections(Principal principal, |
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328 | String query, int offset, int count) |
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329 | throws VirtualCollectionRegistryException { |
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330 | if (principal == null) { |
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331 | throw new NullPointerException("principal == null"); |
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332 | } |
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333 | EntityManager em = datastore.getEntityManager(); |
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334 | try { |
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335 | em.getTransaction().begin(); |
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336 | |
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337 | // fetch user |
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338 | User user = fetchUser(em, principal); |
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339 | if (user == null) { |
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340 | throw new VirtualCollectionRegistryPermissionException("user " + |
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341 | principal.getName() + " does not exist"); |
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342 | } |
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343 | |
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344 | // setup queries |
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345 | TypedQuery<Long> cq = null; |
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346 | TypedQuery<VirtualCollection> q = null; |
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347 | if (query != null) { |
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348 | ParsedQuery parsedQuery = ParsedQuery.parseQuery(em, query); |
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349 | cq = parsedQuery.getCountQuery(user); |
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350 | q = parsedQuery.getQuery(user); |
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351 | } else { |
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352 | cq = em.createNamedQuery("VirtualCollection.countByOwner", Long.class); |
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353 | cq.setParameter("owner", user); |
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354 | q = em.createNamedQuery("VirtualCollection.findByOwner", |
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355 | VirtualCollection.class); |
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356 | q.setParameter("owner", user); |
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357 | } |
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358 | |
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359 | // commence query ... |
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360 | List<VirtualCollection> results = null; |
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361 | long totalCount = cq.getSingleResult(); |
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362 | |
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363 | // optimization; don't query, if we won't get any results |
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364 | if (totalCount > 0) { |
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365 | if (offset > 0) { |
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366 | q.setFirstResult(offset); |
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367 | } |
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368 | if (count > 0) { |
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369 | q.setMaxResults(count); |
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370 | } |
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371 | results = q.getResultList(); |
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372 | } |
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373 | return new VirtualCollectionList(results, offset, (int) totalCount); |
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374 | } catch (QueryException e) { |
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375 | throw new VirtualCollectionRegistryUsageException( |
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376 | "query invalid", e); |
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377 | } catch (VirtualCollectionRegistryException e) { |
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378 | throw e; |
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379 | } catch (Exception e) { |
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380 | logger.error("error while enumerating virtual collections", e); |
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381 | throw new VirtualCollectionRegistryException( |
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382 | "error while enumerating virtual collections", e); |
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383 | } finally { |
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384 | em.getTransaction().commit(); |
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385 | } |
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386 | } |
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387 | |
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388 | private static User fetchUser(EntityManager em, Principal principal) { |
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389 | User user = null; |
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390 | try { |
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391 | TypedQuery<User> q = |
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392 | em.createNamedQuery("User.findByName", User.class); |
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393 | q.setParameter("name", principal.getName()); |
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394 | user = q.getSingleResult(); |
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395 | } catch (NoResultException e) { |
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396 | /* IGNORE */ |
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397 | } |
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398 | return user; |
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399 | } |
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400 | |
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401 | } // class VirtualCollectionRegistry |
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