Java tutorial
/* * Copyright 2011 VZ Netzwerke Ltd * Copyright 2014 devbliss GmbH * * 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.mongojack.internal; import org.mongojack.DBRef; import org.mongojack.Id; import org.mongojack.ObjectId; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.JsonDeserializer; import com.fasterxml.jackson.databind.introspect.Annotated; import com.fasterxml.jackson.databind.introspect.NopAnnotationIntrospector; import com.fasterxml.jackson.databind.type.TypeFactory; import com.fasterxml.jackson.databind.PropertyName; /** * Annotation introspector that supports @ObjectId's * * @author James Roper * @since 1.0 */ public class MongoAnnotationIntrospector extends NopAnnotationIntrospector { private final TypeFactory typeFactory; public MongoAnnotationIntrospector(TypeFactory typeFactory) { this.typeFactory = typeFactory; } // Handling of javax.persistence.Id @Override public PropertyName findNameForDeserialization(Annotated a) { String rawName = findPropertyName(a); if (rawName != null) { return new PropertyName(rawName); } return null; } @Override public PropertyName findNameForSerialization(Annotated a) { String rawName = findPropertyName(a); if (rawName != null) { return new PropertyName(rawName); } return null; } private String findPropertyName(Annotated annotated) { if (annotated.hasAnnotation(Id.class) || annotated.hasAnnotation(javax.persistence.Id.class)) { return "_id"; } return null; } // Handling of ObjectId annotated properties @Override public Object findSerializer(Annotated am) { if (am.hasAnnotation(ObjectId.class)) { return ObjectIdSerializer.class; } return null; } @Override public Object findDeserializer(Annotated am) { if (am.hasAnnotation(ObjectId.class)) { return findObjectIdDeserializer(typeFactory.constructType(am.getGenericType())); } return null; } @Override public JsonDeserializer findContentDeserializer(Annotated am) { if (am.hasAnnotation(ObjectId.class)) { JavaType type = typeFactory.constructType(am.getGenericType()); if (type.isCollectionLikeType()) { return findObjectIdDeserializer(type.containedType(0)); } else if (type.isMapLikeType()) { return findObjectIdDeserializer(type.containedType(1)); } } return null; } public JsonDeserializer findObjectIdDeserializer(JavaType type) { if (type.getRawClass() == String.class) { return new ObjectIdDeserializers.ToStringDeserializer(); } else if (type.getRawClass() == byte[].class) { return new ObjectIdDeserializers.ToByteArrayDeserializer(); } else if (type.getRawClass() == DBRef.class) { JavaType dbRefType; if (type.isContainerType()) { if (type.isCollectionLikeType()) { dbRefType = type.containedType(0); } else if (type.isMapLikeType()) { dbRefType = type.containedType(1); } else { return null; } } else { dbRefType = type; } JsonDeserializer keyDeserializer = findObjectIdDeserializer(dbRefType.containedType(1)); return new DBRefDeserializer(dbRefType.containedType(0), dbRefType.containedType(1), keyDeserializer); } else if (type.getRawClass() == org.bson.types.ObjectId.class) { // Don't know why someone would annotated an ObjectId with // @ObjectId, but handle it return new ObjectIdDeserializers.ToObjectIdDeserializer(); } return null; } }