Mercurial > lada > lada-server

annotate src/main/java/de/intevation/lada/util/data/JsonObjectType.java @ 1299:0eece233cbae

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Added JSON object type to database dialect.
author Raimund Renkert <raimund.renkert@intevation.de>
date Fri, 24 Feb 2017 14:28:19 +0100
parents
children
rev   line source
1299
0eece233cbae Added JSON object type to database dialect.
Raimund Renkert <raimund.renkert@intevation.de>
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1 /* Copyright (C) 2013 by Bundesamt fuer Strahlenschutz
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out
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6 * the documentation coming with IMIS-Labordaten-Application for details.
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7 */
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8 package de.intevation.lada.util.data;
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9
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10 import java.io.IOException;
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11 import java.io.Serializable;
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12 import java.sql.PreparedStatement;
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13 import java.sql.ResultSet;
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14 import java.sql.SQLException;
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15 import java.sql.Types;
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16
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17 import org.hibernate.HibernateException;
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18 import org.hibernate.engine.spi.SessionImplementor;
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19 import org.hibernate.usertype.UserType;
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20
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21 import com.fasterxml.jackson.databind.JsonNode;
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22 import com.fasterxml.jackson.databind.ObjectMapper;
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23
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24 /**
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25 * Implementation for a new data type in the postgresql/postgis jdbc driver.
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26 *
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27 * @author <a href="mailto:rrenkert@intevation.de">Raimund Renkert</a>
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28 */
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29 public class JsonObjectType implements UserType {
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30 /**
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31 * Reconstruct an object from the cacheable representation. At the very
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32 * least this method should perform a deep copy if the type is mutable.
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33 * (optional <span id="IL_AD5" class="IL_AD">operation</span>)
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34 *
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35 * @param cached
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36 * the object to be cached
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37 * @param owner
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38 * the owner of the cached object
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39 * @return a reconstructed object from the cachable representation
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40 * @throws HibernateException
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41 */
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42 @Override
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43 public Object assemble(Serializable cached, Object owner) throws HibernateException {
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44 return this.deepCopy(cached);
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45 }
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46
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47 /**
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48 * Return a deep copy of the persistent state, stopping at entities and st
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49 * collections. It is not necessary to copy immutable objects, or null
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50 * values, in which case it is safe to simple return the argument.
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51 *
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52 * @param value
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53 * the object to be cloned, which may be null
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54 *
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55 * @return object a copy
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56 * @throws HibernateException
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57 */
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58 @Override
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59 public Object deepCopy(Object value) throws HibernateException {
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60 return value;
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61 }
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62
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63 /**
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64 * Transform the object into its cacheable representation. At the very least
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65 * this method should perform a deep copy if the type is mutable. That may
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66 * not be enough for some implementations, however; for example,
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67 * <span id="IL_AD11" class="IL_AD">associations</span> must be cached as <span id="IL_AD9" class="IL_AD">identifier</span> values. (optional operation)
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68 *
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69 * @param value
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70 * the object to be cached
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71 * @return a cachable representation of the object
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72 * @throws HibernateException
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73 */
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74 @Override
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75 public Serializable disassemble(Object value) throws HibernateException {
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76 return (String) this.deepCopy(value);
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77 }
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78
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79 /**
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80 * Compare two instances of the class mapped by this type for persistence
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81 * "equality". Equality of the persistence state.
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82 *
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83 * @param x
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84 * @param y
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85 * @return <span id="IL_AD12" class="IL_AD">boolean</span>
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86 * @throws HibernateException
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87 */
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88 @Override
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89 public boolean equals(Object x, Object y) throws HibernateException {
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90 if (x == null) {
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91 return y == null;
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92 }
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93 return x.equals(y);
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94 }
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95
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96 /**
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97 * Get a hashcode for the instance, consistent with persistence "equality".
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98 */
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99 @Override
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100 public int hashCode(Object x) throws HibernateException {
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101 return x.hashCode();
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102 }
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103
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104 /**
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105 * Are objects of this type mutable?
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106 *
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107 * @return boolean
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108 */
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109 @Override
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110 public boolean isMutable() {
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111 return true;
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112 }
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113
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114 /**
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115 * Retrieve an instance of the mapped class from a JDBC resultset.
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116 * Implementors should handle possibility of null values.
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117 *
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118 * @param rs
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119 * a JDBC result set
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120 * @param names
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121 * the column names
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122 * @param session
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123 * @param owner
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124 * the containing entity
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125 * @return
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126 * @throws HibernateException
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127 * @throws SQLException
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128 */
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129 @Override
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130 public Object nullSafeGet(ResultSet rs, String[] names, SessionImplementor session, Object owner) throws HibernateException, SQLException {
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131 ObjectMapper mapper = new ObjectMapper();
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132 JsonNode node = null;
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133 try {
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134 node = mapper.readTree(rs.getString(names[0]));
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135 return node;
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136 } catch (IOException e) {
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137 e.printStackTrace();
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138 }
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139 return mapper.createObjectNode();
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140 }
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141
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142 /**
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143 * Write an instance of the mapped class to a prepared statement.
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144 * Implementors should handle possibility of null values. A multi-column
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145 * type should be written to parameters starting from <tt>index</tt>
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146 *
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147 * @param st
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148 * a JDBC prepared statement
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149 * @param value
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150 * the object to write
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151 * @param index
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152 * statement parameter index
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153 * @param session
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154 * @throws HibernateException
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155 * @throws SQLException
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156 */
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157 @Override
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158 public void nullSafeSet(PreparedStatement st, Object value, int index, SessionImplementor session) throws HibernateException, SQLException {
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159 if (value == null) {
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160 st.setNull(index, Types.OTHER);
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161 return;
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162 }
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163 st.setObject(index, value, Types.OTHER);
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164 }
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165
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166 /**
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167 * During merge, <span id="IL_AD7" class="IL_AD">replace</span> the existing (target) values in the entity we are
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168 * merging to with a new (original) value from the detched entity we are
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169 * merging. For immutable objects, or null values, it is safe to return a
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170 * copy of the first parameter. For the objects with component values, it
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171 * might make sense to recursively replace component values
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172 *
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173 * @param original
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174 * the value from the detched entity being merged
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175 * @param target
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176 * the value in the managed entity
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177 * @param owner
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178 * @return the value to be merged
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179 * @throws HibernateException
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180 */
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181 @Override
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182 public Object replace(Object original, Object target, Object owner) throws HibernateException {
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183 return original;
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184 }
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185
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186 /**
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187 * The class returned by <tt>nullSafeGet()</tt>
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188 *
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189 * @return Class
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190 */
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191 @Override
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192 public Class returnedClass() {
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193 return String.class;
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194 }
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195
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196 /**
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197 * Returns the SQL type <span id="IL_AD3" class="IL_AD">codes</span> for the columns mapped by this type. The codes
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198 * are defined on <tt>java.sql.Types</tt>
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199 *
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200 * @return int[] the typecodes
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201 * @see java.sql.Types
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202 */
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203 @Override
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204 public int[] sqlTypes() {
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205 return new int[] { Types.JAVA_OBJECT };
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206 }
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207 }
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