server/runtime/org.argeo.server.json/src/main/java/org/argeo/server/json/JsonServerMapper.java

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.server.json;
  18
  19 import java.io.IOException;
  20 import java.io.Reader;
  21 import java.io.StringReader;
  22 import java.util.HashMap;
  23 import java.util.Map;
  24
  25 import org.apache.commons.io.IOUtils;
  26 import org.apache.commons.logging.Log;
  27 import org.apache.commons.logging.LogFactory;
  28 import org.argeo.ArgeoException;
  29 import org.argeo.server.Deserializer;
  30 import org.codehaus.jackson.JsonProcessingException;
  31 import org.codehaus.jackson.map.DeserializationContext;
  32 import org.codehaus.jackson.map.DeserializationProblemHandler;
  33 import org.codehaus.jackson.map.JsonDeserializer;
  34 import org.codehaus.jackson.map.deser.CustomDeserializerFactory;
  35 import org.codehaus.jackson.map.deser.StdDeserializerProvider;
  36 import org.springframework.beans.factory.InitializingBean;
  37
  38 public class JsonServerMapper extends JsonServerSerializer implements
  39                 Deserializer, InitializingBean {
  40         private final static Log log = LogFactory.getLog(JsonServerMapper.class);
  41
  42         private Class<?> targetClass;
  43
  44         private Map<Class<?>, JsonDeserializer<?>> deserializers = new HashMap<Class<?>, JsonDeserializer<?>>();
  45
  46         @SuppressWarnings("unchecked")
  47         public void afterPropertiesSet() throws Exception {
  48                 CustomDeserializerFactory dsf = new CustomDeserializerFactory();
  49                 for (Class clss : deserializers.keySet()) {
  50                         dsf.addSpecificMapping(clss, deserializers.get(clss));
  51                         if (log.isDebugEnabled())
  52                                 log.debug("Add JSON mapping for " + clss);
  53                 }
  54                 StdDeserializerProvider sdp = new StdDeserializerProvider(dsf);
  55                 getObjectMapper().setDeserializerProvider(sdp);
  56                 // ignore unkown properties
  57                 getObjectMapper().getDeserializationConfig().addHandler(
  58                                 new DeserializationProblemHandler() {
  59                                         public boolean handleUnknownProperty(
  60                                                         DeserializationContext ctxt,
  61                                                         JsonDeserializer<?> deserializer, Object bean,
  62                                                         String propertyName) throws IOException,
  63                                                         JsonProcessingException {
  64                                                 if (log.isTraceEnabled())
  65                                                         log.debug("Ignore property " + propertyName
  66                                                                         + " in bean " + bean);
  67                                                 ctxt.getParser().skipChildren();
  68                                                 return true;
  69                                         }
  70                                 });
  71         }
  72
  73         public Object deserialize(Reader reader) {
  74                 try {
  75                         if (log.isTraceEnabled()) {
  76                                 String str = IOUtils.toString(reader);
  77                                 log.debug(str);
  78                                 reader = new StringReader(str);
  79                         }
  80
  81                         return getObjectMapper().readValue(reader, targetClass);
  82                 } catch (Exception e) {
  83                         throw new ArgeoException("Cannot deserialize " + reader, e);
  84                 }
  85
  86         }
  87
  88         public <T> T deserialize(Reader reader, Class<T> clss) {
  89                 try {
  90                         if (log.isTraceEnabled()) {
  91                                 String str = IOUtils.toString(reader);
  92                                 log.debug(str);
  93                                 reader = new StringReader(str);
  94                         }
  95
  96                         return getObjectMapper().readValue(reader, clss);
  97                 } catch (Exception e) {
  98                         throw new ArgeoException("Cannot deserialize " + reader, e);
  99                 }
 100
 101         }
 102
 103         public Object deserialize(String content) {
 104                 StringReader reader = new StringReader(content);
 105                 try {
 106                         return deserialize(reader);
 107                 } finally {
 108                         IOUtils.closeQuietly(reader);
 109                 }
 110         }
 111
 112         public void setTargetClass(Class<?> targetClass) {
 113                 this.targetClass = targetClass;
 114         }
 115
 116         public void setDeserializers(
 117                         Map<Class<?>, JsonDeserializer<?>> deserializers) {
 118                 this.deserializers = deserializers;
 119         }
 120
 121         public Class<?> getTargetClass() {
 122                 return targetClass;
 123         }
 124
 125         public Map<Class<?>, JsonDeserializer<?>> getDeserializers() {
 126                 return deserializers;
 127         }
 128
 129 }