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