| /* |
| * 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. |
| */ |
| |
| /** |
| * 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 verify(boolean result) { |
| return verify(result, null); |
| } |
| |
| public static boolean verify(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) { |
| verify(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); |
| } |
| } |