/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.xml.xpath;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.io.InvalidClassException;
/**
* <code>XPathException</code> represents a generic XPath exception.</p>
*
* @author <a href="Norman.Walsh@Sun.com">Norman Walsh</a>
* @author <a href="mailto:Jeff.Suttor@Sun.COM">Jeff Suttor</a>
* @since 1.5
*/
public class XPathException extends Exception {
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField( "cause", Throwable.class )
};
/**
* <p>Stream Unique Identifier.</p>
*/
private static final long serialVersionUID = -1837080260374986980L;
/**
* <p>Constructs a new <code>XPathException</code>
* with the specified detail <code>message</code>.</p>
*
* <p>The <code>cause</code> is not initialized.</p>
*
* <p>If <code>message</code> is <code>null</code>,
* then a <code>NullPointerException</code> is thrown.</p>
*
* @param message The detail message.
*
* @throws NullPointerException When <code>message</code> is
* <code>null</code>.
*/
public XPathException(String message) {
super(message);
if ( message == null ) {
throw new NullPointerException ( "message can't be null");
}
}
/**
* <p>Constructs a new <code>XPathException</code>
* with the specified <code>cause</code>.</p>
*
* <p>If <code>cause</code> is <code>null</code>,
* then a <code>NullPointerException</code> is thrown.</p>
*
* @param cause The cause.
*
* @throws NullPointerException if <code>cause</code> is <code>null</code>.
*/
public XPathException(Throwable cause) {
super(cause);
if ( cause == null ) {
throw new NullPointerException ( "cause can't be null");
}
}
/**
* <p>Get the cause of this XPathException.</p>
*
* @return Cause of this XPathException.
*/
public Throwable getCause() {
return super.getCause();
}
/**
* Writes "cause" field to the stream.
* The cause is got from the parent class.
*
* @param out stream used for serialization.
* @throws IOException thrown by <code>ObjectOutputStream</code>
*
*/
private void writeObject(ObjectOutputStream out)
throws IOException
{
ObjectOutputStream.PutField fields = out.putFields();
fields.put("cause", (Throwable) super.getCause());
out.writeFields();
}
/**
* Reads the "cause" field from the stream.
* And initializes the "cause" if it wasn't
* done before.
*
* @param in stream used for deserialization
* @throws IOException thrown by <code>ObjectInputStream</code>
* @throws ClassNotFoundException thrown by <code>ObjectInputStream</code>
*/
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException
{
ObjectInputStream.GetField fields = in.readFields();
Throwable scause = (Throwable) fields.get("cause", null);
if (super.getCause() == null && scause != null) {
try {
super.initCause(scause);
} catch(IllegalStateException e) {
throw new InvalidClassException("Inconsistent state: two causes");
}
}
}
/**
* <p>Print stack trace to specified <code>PrintStream</code>.</p>
*
* @param s Print stack trace to this <code>PrintStream</code>.
*/
public void printStackTrace(java.io.PrintStream s) {
if (getCause() != null) {
getCause().printStackTrace(s);
s.println("--------------- linked to ------------------");
}
super.printStackTrace(s);
}
/**
* <p>Print stack trace to <code>System.err</code>.</p>
*/
public void printStackTrace() {
printStackTrace(System.err);
}
/**
* <p>Print stack trace to specified <code>PrintWriter</code>.</p>
*
* @param s Print stack trace to this <code>PrintWriter</code>.
*/
public void printStackTrace(PrintWriter s) {
if (getCause() != null) {
getCause().printStackTrace(s);
s.println("--------------- linked to ------------------");
}
super.printStackTrace(s);
}
}