plugins/org.eclipse.acceleo.model/src/org/eclipse/acceleo/model/mtl/resource/LowLevelIOException.java

/*******************************************************************************
 * Copyright (c) 2004, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     OBEO - fork for stand alone use in Acceleo
 *******************************************************************************/
package org.eclipse.acceleo.model.mtl.resource;

// CHECKSTYLE:OFF
import java.io.IOException;

import org.eclipse.core.internal.content.LazyReader;
import org.eclipse.core.runtime.Assert;

/**
 * A wrapper for IOExceptions, throw by LazyInputStream/Reader. Its purpose is to allow one to differentiate
 * between IOExceptions thrown by the base stream/reader from those thrown by streams/readers built on top of
 * LazyInputStream/Reader.
 * 
 * @see LazyInputStream
 * @see LazyReader
 */
/* package */class LowLevelIOException extends IOException {

	/**
	 * All serializable objects should have a stable serialVersionUID
	 */
	private static final long serialVersionUID = 1L;

	private IOException actual;

	public LowLevelIOException(IOException actual) {
		// ensure we don't wrap more than once
		Assert.isLegal(!(actual instanceof LowLevelIOException));
		this.actual = actual;
	}

	public IOException getActualException() {
		return actual;
	}
}