Java tutorial
/* * Copyright 2008-present MongoDB, Inc. * * 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 com.mongodb; import com.mongodb.lang.Nullable; import org.bson.LazyBSONDecoder; import java.io.IOException; import java.io.InputStream; /** * A decoder for {@code LazyDBObject} instances. */ public class LazyDBDecoder extends LazyBSONDecoder implements DBDecoder { @Override public DBCallback getDBCallback(@Nullable final DBCollection collection) { // callback doesn't do anything special, could be unique per decoder // but have to create per collection due to DBRef, at least return new LazyDBCallback(collection); } @Override public DBObject readObject(final InputStream in) throws IOException { DBCallback dbCallback = getDBCallback(null); decode(in, dbCallback); return (DBObject) dbCallback.get(); } @Override public DBObject decode(final InputStream input, final DBCollection collection) throws IOException { DBCallback callback = getDBCallback(collection); decode(input, callback); return (DBObject) callback.get(); } @Override public DBObject decode(final byte[] bytes, final DBCollection collection) { DBCallback callback = getDBCallback(collection); decode(bytes, callback); return (DBObject) callback.get(); } public static final DBDecoderFactory FACTORY = new DBDecoderFactory() { @Override public DBDecoder create() { return new LazyDBDecoder(); } }; }