/*******************************************************************************
 * Copyright (c) 2001, 2004 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
 *******************************************************************************/
package org.eclipse.jst.j2ee.internal;


import java.util.ArrayList;
import java.util.List;
/**
 * Utility class to factor common code for implementers of IWrappedException
 */
public class ExceptionHelper {
/**
 * Utility class; cannot be instantiated
 */
private ExceptionHelper() {
	super();
}
/**
 * Return the messages from @exception and all nested exceptions, in order from outermost to innermost
 */
public static java.lang.String[] getAllMessages(IWrappedException exception) {
	List messages = new ArrayList(4);
	messages.add(exception.getMessage());
	Exception nested = exception.getNestedException();
	while (nested != null) {
		messages.add(nested.getMessage());
		if (nested instanceof IWrappedException) 
			nested = ((IWrappedException)nested).getNestedException();
		else
			nested = null;
	}
	return (String[])messages.toArray(new String[messages.size()]);
}
/**
 * Return the messages from @exception and all nested exceptions, in order from outermost to innermost,
 * concatenated as one
 */
public static String getConcatenatedMessages(IWrappedException exception) {
	String[] messages = getAllMessages(exception);
	StringBuffer sb = new StringBuffer(256);
	for (int i = 0; i < messages.length; i++){
		sb.append(messages[i]);
		if (i < messages.length-1)
			sb.append('\n');
	}
	return sb.toString();
}
}