src/main/java/javax/xml/crypto/dsig/TransformException.java

/**
 * 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.
 */
/*
 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
 */
/*
 * $Id$
 */
package javax.xml.crypto.dsig;

import java.io.PrintStream;
import java.io.PrintWriter;

/**
 * Indicates an exceptional condition that occured while executing a
 * transform algorithm.
 *
 * <p>A <code>TransformException</code> can contain a cause: another 
 * throwable that caused this <code>TransformException</code> to get thrown. 
 *
 * @see Transform#transform
 * @author Sean Mullan
 * @author JSR 105 Expert Group
 */
public class TransformException extends Exception {

    private static final long serialVersionUID = 5082634801360427800L;

    /**
     * The throwable that caused this exception to get thrown, or null if this
     * exception was not caused by another throwable or if the causative
     * throwable is unknown. 
     *
     * @serial
     */
    private Throwable cause;

    /**
     * Constructs a new <code>TransformException</code> with 
     * <code>null</code> as its detail message.
     */
    public TransformException() {
        super();
    }

    /**
     * Constructs a new <code>TransformException</code> with the specified 
     * detail message. 
     *
     * @param message the detail message
     */
    public TransformException(String message) {
        super(message);
    }

    /**
     * Constructs a new <code>TransformException</code> with the 
     * specified detail message and cause.  
     * <p>Note that the detail message associated with
     * <code>cause</code> is <i>not</i> automatically incorporated in
     * this exception's detail message.
     *
     * @param message the detail message 
     * @param cause the cause (A <tt>null</tt> value is permitted, and 
     *	      indicates that the cause is nonexistent or unknown.)
     */
    public TransformException(String message, Throwable cause) {
        super(message);
        this.cause = cause;
    }

    /**
     * Constructs a new <code>TransformException</code> with the specified 
     * cause and a detail message of 
     * <code>(cause==null ? null : cause.toString())</code>
     * (which typically contains the class and detail message of 
     * <code>cause</code>).
     *
     * @param cause the cause (A <tt>null</tt> value is permitted, and 
     *        indicates that the cause is nonexistent or unknown.)
     */
    public TransformException(Throwable cause) {
        super(cause==null ? null : cause.toString());
        this.cause = cause;
    }

    /**
     * Returns the cause of this <code>TransformException</code> or 
     * <code>null</code> if the cause is nonexistent or unknown.  (The 
     * cause is the throwable that caused this 
     * <code>TransformException</code> to get thrown.)
     *
     * @return the cause of this <code>TransformException</code> or 
     *         <code>null</code> if the cause is nonexistent or unknown.
     */
    public Throwable getCause() {
        return cause;
    }

    /**
     * Prints this <code>TransformException</code>, its backtrace and
     * the cause's backtrace to the standard error stream.
     */
    public void printStackTrace() {
        super.printStackTrace();
        if (cause != null) {
            cause.printStackTrace();
        }
    }

    /**
     * Prints this <code>TransformException</code>, its backtrace and
     * the cause's backtrace to the specified print stream.
     *
     * @param s <code>PrintStream</code> to use for output
     */
    public void printStackTrace(PrintStream s) {
        super.printStackTrace(s);
        if (cause != null) {
            cause.printStackTrace(s);
        }
    }

    /**
     * Prints this <code>TransformException</code>, its backtrace and
     * the cause's backtrace to the specified print writer.
     *
     * @param s <code>PrintWriter</code> to use for output
     */
    public void printStackTrace(PrintWriter s) {
        super.printStackTrace(s);
        if (cause != null) {
            cause.printStackTrace(s);
        }
    }
}