1/*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements.  See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License.  You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17// $Id: XPathException.java 446598 2006-09-15 12:55:40Z jeremias $
18
19package javax.xml.xpath;
20
21import java.io.PrintWriter;
22
23/**
24 * <code>XPathException</code> represents a generic XPath exception.</p>
25 *
26 * @author  <a href="Norman.Walsh@Sun.com">Norman Walsh</a>
27 * @author <a href="mailto:Jeff.Suttor@Sun.COM">Jeff Suttor</a>
28 * @version $Revision: 446598 $, $Date: 2006-09-15 05:55:40 -0700 (Fri, 15 Sep 2006) $
29 * @since 1.5
30 */
31public class XPathException extends Exception {
32
33    private final Throwable cause;
34
35    /**
36     * <p>Stream Unique Identifier.</p>
37     */
38    private static final long serialVersionUID = -1837080260374986980L;
39
40    /**
41     * <p>Constructs a new <code>XPathException</code> with the specified detail <code>message</code>.</p>
42     *
43     * <p>The <code>cause</code> is not initialized.</p>
44     *
45     * <p>If <code>message</code> is <code>null</code>, then a <code>NullPointerException</code> is thrown.</p>
46     *
47     * @param message The detail message.
48     */
49    public XPathException(String message) {
50        super(message);
51        if ( message == null ) {
52            throw new NullPointerException ( "message can't be null");
53        }
54        this.cause = null;
55    }
56
57    /**
58     * <p>Constructs a new <code>XPathException</code> with the specified <code>cause</code>.</p>
59     *
60     * <p>If <code>cause</code> is <code>null</code>, then a <code>NullPointerException</code> is thrown.</p>
61     *
62     * @param cause The cause.
63     *
64     * @throws NullPointerException if <code>cause</code> is <code>null</code>.
65     */
66    public XPathException(Throwable cause) {
67        super(cause == null ? null : cause.toString());
68        this.cause = cause;
69        if ( cause == null ) {
70            throw new NullPointerException ( "cause can't be null");
71        }
72    }
73
74    public Throwable getCause() {
75        return cause;
76    }
77
78    public void printStackTrace( java.io.PrintStream s ) {
79        if( getCause() != null ) {
80            getCause().printStackTrace(s);
81          s.println("--------------- linked to ------------------");
82        }
83
84        super.printStackTrace(s);
85    }
86
87    public void printStackTrace() {
88        printStackTrace(System.err);
89    }
90
91    public void printStackTrace(PrintWriter s) {
92        if( getCause() != null ) {
93            getCause().printStackTrace(s);
94          s.println("--------------- linked to ------------------");
95        }
96
97        super.printStackTrace(s);
98    }
99}
100