--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/carbidecpp20devenv/plugins/org.eclipse.test.source_3.3.0.v20080507/src/org.junit4_4.3.1/junitsrc/org/junit/ComparisonFailure.java	Wed Mar 18 17:21:00 2009 -0500
@@ -0,0 +1,138 @@
+package org.junit;
+
+/**
+ * Thrown when an {@link org.junit.Assert#assertEquals(Object, Object) assertEquals(String, String)} fails. Create and throw
+ * a <code>ComparisonFailure</code> manually if you want to show users the difference between two complex 
+ * strings.
+ * 
+ * Inspired by a patch from Alex Chaffee (alex@purpletech.com)
+ */
+public class ComparisonFailure extends AssertionError {	
+	/** 
+	 * The maximum length for fExpected and fActual. If it is exceeded, the strings should be shortened. 
+	 * @see ComparisonCompactor
+	 */
+	private static final int MAX_CONTEXT_LENGTH= 20;
+	private static final long serialVersionUID= 1L;
+	
+	private String fExpected;
+	private String fActual;
+
+	/**
+	 * Constructs a comparison failure.
+	 * @param message the identifying message or null
+	 * @param expected the expected string value
+	 * @param actual the actual string value
+	 */
+	public ComparisonFailure (String message, String expected, String actual) {
+		super (message);
+		fExpected= expected;
+		fActual= actual;
+	}
+	
+	/**
+	 * Returns "..." in place of common prefix and "..." in
+	 * place of common suffix between expected and actual.
+	 * 
+	 * @see Throwable#getMessage()
+	 */
+	@Override
+	public String getMessage() {
+		return new ComparisonCompactor(MAX_CONTEXT_LENGTH, fExpected, fActual).compact(super.getMessage());
+	}
+	
+	/**
+	 * Returns the actual string value
+	 * @return the actual string value
+	 */
+	public String getActual() {
+		return fActual;
+	}
+	/**
+	 * Returns the expected string value
+	 * @return the expected string value
+	 */
+	public String getExpected() {
+		return fExpected;
+	}
+	
+	private static class ComparisonCompactor {
+		private static final String ELLIPSIS= "...";
+		private static final String DELTA_END= "]";
+		private static final String DELTA_START= "[";
+		
+		/**
+		 * The maximum length for <code>expected</code> and <code>actual</code>. When <code>contextLength</code> 
+		 * is exceeded, the Strings are shortened
+		 */
+		private int fContextLength;
+		private String fExpected;
+		private String fActual;
+		private int fPrefix;
+		private int fSuffix;
+
+		/**
+		 * @param contextLength the maximum length for <code>expected</code> and <code>actual</code>. When contextLength 
+		 * is exceeded, the Strings are shortened
+		 * @param expected the expected string value
+		 * @param actual the actual string value
+		 */
+		public ComparisonCompactor(int contextLength, String expected, String actual) {
+			fContextLength= contextLength;
+			fExpected= expected;
+			fActual= actual;
+		}
+
+		public String compact(String message) {
+			if (fExpected == null || fActual == null || areStringsEqual())
+				return Assert.format(message, fExpected, fActual);
+
+			findCommonPrefix();
+			findCommonSuffix();
+			String expected= compactString(fExpected);
+			String actual= compactString(fActual);
+			return Assert.format(message, expected, actual);
+		}
+
+		private String compactString(String source) {
+			String result= DELTA_START + source.substring(fPrefix, source.length() - fSuffix + 1) + DELTA_END;
+			if (fPrefix > 0)
+				result= computeCommonPrefix() + result;
+			if (fSuffix > 0)
+				result= result + computeCommonSuffix();
+			return result;
+		}
+
+		private void findCommonPrefix() {
+			fPrefix= 0;
+			int end= Math.min(fExpected.length(), fActual.length());
+			for (; fPrefix < end; fPrefix++) {
+				if (fExpected.charAt(fPrefix) != fActual.charAt(fPrefix))
+					break;
+			}
+		}
+
+		private void findCommonSuffix() {
+			int expectedSuffix= fExpected.length() - 1;
+			int actualSuffix= fActual.length() - 1;
+			for (; actualSuffix >= fPrefix && expectedSuffix >= fPrefix; actualSuffix--, expectedSuffix--) {
+				if (fExpected.charAt(expectedSuffix) != fActual.charAt(actualSuffix))
+					break;
+			}
+			fSuffix=  fExpected.length() - expectedSuffix;
+		}
+
+		private String computeCommonPrefix() {
+			return (fPrefix > fContextLength ? ELLIPSIS : "") + fExpected.substring(Math.max(0, fPrefix - fContextLength), fPrefix);
+		}
+
+		private String computeCommonSuffix() {
+			int end= Math.min(fExpected.length() - fSuffix + 1 + fContextLength, fExpected.length());
+			return fExpected.substring(fExpected.length() - fSuffix + 1, end) + (fExpected.length() - fSuffix + 1 < fExpected.length() - fContextLength ? ELLIPSIS : "");
+		}
+
+		private boolean areStringsEqual() {
+			return fExpected.equals(fActual);
+		}
+	}
+}
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