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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
/* $Id$ */
package org.apache.fop.render.afp.exceptions;
import java.io.PrintStream;
import java.io.PrintWriter;
/**
* Handy class for wrapping runtime Exceptions with a root cause.
* This technique is no longer necessary in Java 1.4, which provides
* built-in support for exception nesting. Thus exceptions in applications
* written to use Java 1.4 need not extend this class.
*
*/
public abstract class NestedRuntimeException extends RuntimeException {
/** Root cause of this nested exception */
private Throwable underlyingException;
/**
* Construct a <code>NestedRuntimeException</code> with the specified detail message.
* @param msg The detail message.
*/
public NestedRuntimeException(String msg) {
super(msg);
}
/**
* Construct a <code>NestedRuntimeException</code> with the specified
* detail message and nested exception.
* @param msg The detail message.
* @param t The nested exception.
*/
public NestedRuntimeException(String msg, Throwable t) {
super(msg);
underlyingException = t;
}
/**
* Gets the original triggering exception
* @return The original exception as a throwable.
*/
public Throwable getUnderlyingException() {
return underlyingException;
}
/**
* Return the detail message, including the message from the nested
* exception if there is one.
* @return The detail message.
*/
public String getMessage() {
if (underlyingException == null) {
return super.getMessage();
} else {
return super.getMessage()
+ "; nested exception is "
+ underlyingException.getClass().getName();
}
}
/**
* Print the composite message and the embedded stack trace to the specified stream.
* @param ps the print stream
*/
public void printStackTrace(PrintStream ps) {
if (underlyingException == null) {
super.printStackTrace(ps);
} else {
ps.println(this);
underlyingException.printStackTrace(ps);
}
}
/**
* Print the composite message and the embedded stack trace to the specified writer.
* @param pw the print writer
*/
public void printStackTrace(PrintWriter pw) {
if (underlyingException == null) {
super.printStackTrace(pw);
} else {
pw.println(this);
underlyingException.printStackTrace(pw);
}
}
}
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