/**
 * Copyright 2006-2009 the original author or authors.
 *
 * 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 ext.test4j.objenesis.instantiator.gcj;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.lang.reflect.Method;

import ext.test4j.objenesis.ObjenesisException;
import ext.test4j.objenesis.instantiator.ObjectInstantiator;

/**
 * Base class for GCJ-based instantiators. It initializes reflection access to
 * method ObjectInputStream.newObject, as well as creating a dummy
 * ObjectInputStream to be used as the "this" argument for the method.
 * 
 * @author Leonardo Mesquita
 */
@SuppressWarnings("rawtypes")
public abstract class GCJInstantiatorBase implements ObjectInstantiator {
	protected static Method newObjectMethod = null;
	protected static ObjectInputStream dummyStream;

	private static class DummyStream extends ObjectInputStream {
		public DummyStream() throws IOException {
		}
	}

	private static void initialize() {
		if (newObjectMethod == null) {
			try {
				newObjectMethod = ObjectInputStream.class.getDeclaredMethod("newObject", new Class[] { Class.class,
						Class.class });
				newObjectMethod.setAccessible(true);
				dummyStream = new DummyStream();
			} catch (RuntimeException e) {
				throw new ObjenesisException(e);
			} catch (NoSuchMethodException e) {
				throw new ObjenesisException(e);
			} catch (IOException e) {
				throw new ObjenesisException(e);
			}
		}
	}

	protected final Class type;

	public GCJInstantiatorBase(Class type) {
		this.type = type;
		initialize();
	}

	public abstract Object newInstance();
}