Java tutorial
/* * Copyright (C) 2011 Benoit GUEROUT <bguerout at gmail dot com> and Yves AMSELLEM <amsellem dot yves at gmail dot com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.jongo.marshall.jackson.oid; import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.core.TreeNode; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.databind.deser.ContextualDeserializer; import org.bson.types.ObjectId; import java.io.IOException; import static org.jongo.MongoCollection.MONGO_QUERY_OID; public class ObjectIdDeserializer extends JsonDeserializer<Object> implements ContextualDeserializer { private boolean fieldIsObjectId = false; public ObjectIdDeserializer() { this(false); } public ObjectIdDeserializer(boolean fieldIsObjectId) { this.fieldIsObjectId = fieldIsObjectId; } @Override public Object deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException { TreeNode treeNode = jp.readValueAsTree(); JsonNode oid = ((JsonNode) treeNode).get(MONGO_QUERY_OID); if (fieldIsObjectId) { if (oid != null) { return new ObjectId(oid.asText()); } else { return new ObjectId(((JsonNode) treeNode).asText()); } } else { if (oid != null) { return oid.asText(); } else { return ((JsonNode) treeNode).asText(); } } } public JsonDeserializer<?> createContextual(DeserializationContext ctxt, BeanProperty property) throws JsonMappingException { return new ObjectIdDeserializer(ObjectId.class.isAssignableFrom(property.getType().getRawClass())); } }