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Implementation of the LDP4j Application Kernel
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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the LDP4j Project:
 *     http://www.ldp4j.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2014-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.ldp4j.framework:ldp4j-application-kernel-core:0.2.2
 *   Bundle      : ldp4j-application-kernel-core-0.2.2.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.ldp4j.application.kernel.engine;

import org.ldp4j.application.data.Individual;
import org.ldp4j.application.data.Name;
import org.ldp4j.application.ext.ResourceHandler;
import org.ldp4j.application.kernel.transaction.Transaction;
import org.ldp4j.application.session.ResourceSnapshot;
import org.ldp4j.application.session.SessionTerminationException;
import org.ldp4j.application.session.WriteSession;
import org.ldp4j.application.session.WriteSessionException;

import com.google.common.base.MoreObjects;

final class TransactionalWriteSession implements WriteSession {

	private final Transaction transaction;
	private final WriteSession delegate;

	TransactionalWriteSession(Transaction transaction, WriteSession delegate) {
		this.transaction = transaction;
		this.delegate = delegate;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public  S find(Class snapshotClass, Name id, Class handlerClass) {
		return this.delegate.find(snapshotClass, id, handlerClass);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public  S resolve(Class snapshotClass, Individual individual) {
		return this.delegate.resolve(snapshotClass, individual);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void modify(ResourceSnapshot resource) {
		this.delegate.modify(resource);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void delete(ResourceSnapshot resource) {
		this.delegate.delete(resource);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void saveChanges() throws WriteSessionException {
		this.delegate.saveChanges();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void discardChanges() throws WriteSessionException {
		this.delegate.discardChanges();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void close() throws SessionTerminationException {
		try {
			this.delegate.close();
		} finally {
			if(this.transaction.isActive()) {
				this.transaction.rollback();
			}
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public String toString() {
		return
			MoreObjects.
				toStringHelper(getClass()).
					add("transaction",transaction).
					add("delegate",delegate).
					toString();
	}

}