javax.xml.xpath.XPathException Maven / Gradle / Ivy
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/*
* Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* questions.
*/
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} represents a generic XPath exception.
*
* @author Norman Walsh
* @author Jeff Suttor
* @since 1.5
*/
public class XPathException extends Exception {
/**
* Serializable fields.
*/
private static final ObjectStreamField[] serialPersistentFields = {
new ObjectStreamField( "cause", Throwable.class )
};
/**
* Stream Unique Identifier.
*/
private static final long serialVersionUID = -1837080260374986980L;
/**
* Constructs a new {@code XPathException}
* with the specified detail {@code message}.
*
* The {@code cause} is not initialized.
*
*
If {@code message} is {@code null},
* then a {@code NullPointerException} is thrown.
*
* @param message The detail message.
*
* @throws NullPointerException When {@code message} is
* {@code null}.
*/
public XPathException(String message) {
super(message);
if ( message == null ) {
throw new NullPointerException ( "message can't be null");
}
}
/**
* Constructs a new {@code XPathException}
* with the specified {@code cause}.
*
*
If {@code cause} is {@code null},
* then a {@code NullPointerException} is thrown.
*
* @param cause The cause.
*
* @throws NullPointerException if {@code cause} is {@code null}.
*/
public XPathException(Throwable cause) {
super(cause);
if ( cause == null ) {
throw new NullPointerException ( "cause can't be null");
}
}
/**
* Get the cause of this XPathException.
*
* @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}
*
*/
private void writeObject(ObjectOutputStream out)
throws IOException
{
ObjectOutputStream.PutField fields = out.putFields();
fields.put("cause", 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}
* @throws ClassNotFoundException thrown by {@code ObjectInputStream}
*/
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");
}
}
}
/**
* Print stack trace to specified {@code PrintStream}.
*
* @param s Print stack trace to this {@code PrintStream}.
*/
public void printStackTrace(java.io.PrintStream s) {
if (getCause() != null) {
getCause().printStackTrace(s);
s.println("--------------- linked to ------------------");
}
super.printStackTrace(s);
}
/**
* Print stack trace to {@code System.err}.
*/
public void printStackTrace() {
printStackTrace(System.err);
}
/**
* Print stack trace to specified {@code PrintWriter}.
*
* @param s Print stack trace to this {@code PrintWriter}.
*/
public void printStackTrace(PrintWriter s) {
if (getCause() != null) {
getCause().printStackTrace(s);
s.println("--------------- linked to ------------------");
}
super.printStackTrace(s);
}
}