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63
64 package dom.util;
65
66 import java.io.PrintWriter  ;
67 import java.io.StringWriter ;
68
69 public class Assertion {
70
71 public static boolean assertTrue(boolean result) {
72 return assertTrue(result, null);
73 }
74
75 public static boolean assertTrue(boolean result, String error) {
76 if (!result) {
77 System.err.print("Assertion failed: ");
78 if (error != null) {
79 System.err.print(error);
80 }
81 System.err.println();
82 System.err.println(getSourceLocation());
83 }
84 return result;
85 }
86
87 public static boolean equals(String s1, String s2) {
88 boolean result = ((s1 != null && s1.equals(s2))
89 || (s1 == null && s2 == null));
90 if (!result) {
91 assertTrue(result);
92 System.err.println(" was: equals(" + s1 + ", \"" + s2 + "\")");
93 }
94 return result;
95 }
96
97 public static String getSourceLocation() {
98 RuntimeException ex = new RuntimeException ("assertion failed");
99 StringWriter writer = new StringWriter ();
100 PrintWriter printer = new PrintWriter (writer);
101 ex.printStackTrace(printer);
102 String buf = writer.toString();
103 int index = buf.lastIndexOf("dom.util.Assertion.");
105 index = buf.indexOf('\n', index);
106 return buf.substring(index + 1);
107 }
108 }
109 |
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