/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package com.sun.enterprise.util;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
/**
* Useful utilities for Exceptions
* Subset of methods copied from org.glassfish.admin.amx.util
*/
public final class ExceptionUtil
{
private ExceptionUtil()
{
// disallow instantiation
}
/**
Get the chain of exceptions via getCause(). The first element is the
Exception passed.
@param start the Exception to traverse
@return a Throwable[] or an Exception[] as appropriate
*/
public static Throwable[] getCauses(final Throwable start)
{
final ArrayList<Throwable> list = new ArrayList<Throwable>();
boolean haveNonException = false;
Throwable t = start;
while (t != null)
{
list.add(t);
if (!(t instanceof Exception))
{
haveNonException = true;
}
final Throwable temp = t.getCause();
if (temp == null)
{
break;
}
t = temp;
}
final Throwable[] results = haveNonException ? new Throwable[list.size()] : new Exception[list.size()];
list.toArray(results);
return (results);
}
/**
Get the original troublemaker.
@param e the Exception to dig into
@return the original Throwable that started the problem
*/
public static Throwable getRootCause(final Throwable e)
{
final Throwable[] causes = getCauses(e);
return (causes[causes.length - 1]);
}
/**
Get the stack trace as a String.
@param t the Throwabe whose stack trace should be gotten
@return a String containing the stack trace
*/
public static String getStackTrace(Throwable t)
{
final StringBuffer buf = new StringBuffer();
final StackTraceElement[] elems = t.getStackTrace();
for (int i = 0; i < elems.length; ++i)
{
buf.append(elems[i]);
buf.append("\n");
}
return (buf.toString());
}
}