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/* Copyright 2002-2005 Elliotte Rusty Harold
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This library is free software; you can redistribute it and/or modify
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it under the terms of version 2.1 of the GNU Lesser General Public
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License as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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Boston, MA 02111-1307 USA
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You can contact Elliotte Rusty Harold by sending e-mail to
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elharo@metalab.unc.edu. Please include the word "XOM" in the
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subject line. The XOM home page is located at http://www.xom.nu/
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* The generic superclass for most runtime exceptions thrown in
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* <code>nu.xom</code>. The general principle followed is that
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* anything that can normally be detected by testing such as
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* using spaces in an element name is a runtime exception.
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* Exceptions that depend on environmental conditions,
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* such as might occur when parsing an external file,
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* are checked exceptions, because these depend on variable input,
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* and thus all problems may not be detected during testing.
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* @author Elliotte Rusty Harold
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public class XMLException extends RuntimeException {
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private static final long serialVersionUID = -4497254051626978523L;
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private Throwable cause;
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* Creates a new <code>XMLException</code>
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* with the specified detail message
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* and an underlying root cause.
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* @param message information about the cause of the exception
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* @param cause the nested exception that caused this exception
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public XMLException(String message, Throwable cause) {
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this.initCause(cause);
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* Creates a new <code>XMLException</code> with
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* the specified detail message.
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* @param message information about the cause of the exception
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public XMLException(String message) {
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* Return the original cause that led to this exception,
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* or null if there was no original exception.
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* @return the root cause of this exception
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public Throwable getCause() {
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// null is insufficient for detecting an uninitialized cause.
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// The cause may be set to null which may not then be reset.
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private boolean causeSet = false;
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* Sets the root cause of this exception. This may
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* only be called once. Subsequent calls throw an
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* <code>IllegalStateException</code>.
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* This method is unnecessary in Java 1.4 where it could easily be
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* inherited from the superclass. However, including it here
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* allows this method to be used in Java 1.3 and earlier.
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* @param cause the root cause of this exception
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* @return this <code>XMLException</code>
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* @throws IllegalArgumentException if the cause is this exception
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* (An exception cannot be its own cause.)
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* @throws IllegalStateException if this method is called twice
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public final Throwable initCause(Throwable cause) {
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throw new IllegalStateException("Can't overwrite cause");
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else if (cause == this) {
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throw new IllegalArgumentException("Self-causation not permitted");
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else this.cause = cause;
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src/nu/xom/XMLException.java
