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

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   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 package org.argeo.server.json;
  17
  18 import java.io.IOException;
  19 import java.io.Reader;
  20 import java.io.StringReader;
  21 import java.util.HashMap;
  22 import java.util.Map;
  23
  24 import org.apache.commons.io.IOUtils;
  25 import org.apache.commons.logging.Log;
  26 import org.apache.commons.logging.LogFactory;
  27 import org.argeo.ArgeoException;
  28 import org.argeo.server.Deserializer;
  29 import org.codehaus.jackson.JsonProcessingException;
  30 import org.codehaus.jackson.map.DeserializationContext;
  31 import org.codehaus.jackson.map.DeserializationProblemHandler;
  32 import org.codehaus.jackson.map.JsonDeserializer;
  33 import org.codehaus.jackson.map.deser.CustomDeserializerFactory;
  34 import org.codehaus.jackson.map.deser.StdDeserializerProvider;
  35 import org.springframework.beans.factory.InitializingBean;
  36
  37 public class JsonServerMapper extends JsonServerSerializer implements
  38                 Deserializer, InitializingBean {
  39         private final static Log log = LogFactory.getLog(JsonServerMapper.class);
  40
  41         private Class<?> targetClass;
  42
  43         private Map<Class<?>, JsonDeserializer<?>> deserializers = new HashMap<Class<?>, JsonDeserializer<?>>();
  44
  45         @SuppressWarnings("unchecked")
  46         public void afterPropertiesSet() throws Exception {
  47                 CustomDeserializerFactory dsf = new CustomDeserializerFactory();
  48                 for (Class clss : deserializers.keySet()) {
  49                         dsf.addSpecificMapping(clss, deserializers.get(clss));
  50                         if (log.isDebugEnabled())
  51                                 log.debug("Add JSON mapping for " + clss);
  52                 }
  53                 StdDeserializerProvider sdp = new StdDeserializerProvider(dsf);
  54                 getObjectMapper().setDeserializerProvider(sdp);
  55                 // ignore unkown properties
  56                 getObjectMapper().getDeserializationConfig().addHandler(
  57                                 new DeserializationProblemHandler() {
  58                                         public boolean handleUnknownProperty(
  59                                                         DeserializationContext ctxt,
  60                                                         JsonDeserializer<?> deserializer, Object bean,
  61                                                         String propertyName) throws IOException,
  62                                                         JsonProcessingException {
  63                                                 if (log.isTraceEnabled())
  64                                                         log.debug("Ignore property " + propertyName
  65                                                                         + " in bean " + bean);
  66                                                 ctxt.getParser().skipChildren();
  67                                                 return true;
  68                                         }
  69                                 });
  70         }
  71
  72         public Object deserialize(Reader reader) {
  73                 try {
  74                         if (log.isTraceEnabled()) {
  75                                 String str = IOUtils.toString(reader);
  76                                 log.debug(str);
  77                                 reader = new StringReader(str);
  78                         }
  79
  80                         return getObjectMapper().readValue(reader, targetClass);
  81                 } catch (Exception e) {
  82                         throw new ArgeoException("Cannot deserialize " + reader, e);
  83                 }
  84
  85         }
  86
  87         public <T> T deserialize(Reader reader, Class<T> clss) {
  88                 try {
  89                         if (log.isTraceEnabled()) {
  90                                 String str = IOUtils.toString(reader);
  91                                 log.debug(str);
  92                                 reader = new StringReader(str);
  93                         }
  94
  95                         return getObjectMapper().readValue(reader, clss);
  96                 } catch (Exception e) {
  97                         throw new ArgeoException("Cannot deserialize " + reader, e);
  98                 }
  99
 100         }
 101
 102         public Object deserialize(String content) {
 103                 StringReader reader = new StringReader(content);
 104                 try {
 105                         return deserialize(reader);
 106                 } finally {
 107                         IOUtils.closeQuietly(reader);
 108                 }
 109         }
 110
 111         public void setTargetClass(Class<?> targetClass) {
 112                 this.targetClass = targetClass;
 113         }
 114
 115         public void setDeserializers(
 116                         Map<Class<?>, JsonDeserializer<?>> deserializers) {
 117                 this.deserializers = deserializers;
 118         }
 119
 120         public Class<?> getTargetClass() {
 121                 return targetClass;
 122         }
 123
 124         public Map<Class<?>, JsonDeserializer<?>> getDeserializers() {
 125                 return deserializers;
 126         }
 127
 128 }