DefaultMultiGetItemResponseWrapper.java

/**
 * Copyright 2010 Molindo 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 at.molindo.esi4j.action.impl;

import org.elasticsearch.action.get.MultiGetItemResponse;

import at.molindo.esi4j.action.MultiGetItemResponseWrapper;

public class DefaultMultiGetItemResponseWrapper implements MultiGetItemResponseWrapper {

	private final MultiGetItemResponse _response;
	private final MultiGetItemReader _reader;

	private Object _object;

	public DefaultMultiGetItemResponseWrapper(final MultiGetItemResponse response, final MultiGetItemReader reader) {
		if (response == null) {
			throw new NullPointerException("response");
		}
		if (reader == null) {
			throw new NullPointerException("reader");
		}
		_response = response;
		_reader = reader;
	}

	@Override
	public Object getObject() {
		return getObject(Object.class);
	}

	@Override
	public synchronized <T> T getObject(final Class<T> type) {
		if (_object == null) {
			_object = _reader.read(_response);
		}
		return type.cast(_object);
	}

	@Override
	public MultiGetItemResponse getMultiGetItemResponse() {
		return _response;
	}

}