| /* $Id$ */ |
| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 1999 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xerces" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache\@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation, and was |
| * originally based on software copyright (c) 1999, International |
| * Business Machines, Inc., http://www.ibm.com . For more information |
| * on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| /** |
| * A simple Assertion class (a hack really ;-) to report the source line number |
| * where an assertion fails. |
| */ |
| |
| |
| package dom.util; |
| |
| import java.io.StringWriter; |
| import java.io.PrintWriter; |
| |
| public class Assertion { |
| |
| public static boolean assert(boolean result) { |
| return assert(result, null); |
| } |
| |
| public static boolean assert(boolean result, String error) { |
| if (!result) { |
| System.err.print("Assertion failed: "); |
| if (error != null) { |
| System.err.print(error); |
| } |
| System.err.println(); |
| System.err.println(getSourceLocation()); |
| } |
| return result; |
| } |
| |
| public static boolean equals(String s1, String s2) { |
| boolean result = ((s1 != null && s1.equals(s2)) |
| || (s1 == null && s2 == null)); |
| if (!result) { |
| assert(result); |
| System.err.println(" was: equals(" + s1 + ", \"" + s2 + "\")"); |
| } |
| return result; |
| } |
| |
| public static String getSourceLocation() { |
| RuntimeException ex = new RuntimeException("assertion failed"); |
| StringWriter writer = new StringWriter(); |
| PrintWriter printer = new PrintWriter(writer); |
| ex.printStackTrace(printer); |
| String buf = writer.toString(); |
| // skip the first line as well as every line related to this class |
| int index = buf.lastIndexOf("dom.util.Assertion."); |
| index = buf.indexOf('\n', index); |
| return buf.substring(index + 1); |
| } |
| } |