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package junit.framework;
public class ComparisonCompactor {
private static final String ELLIPSIS = "...";
private static final String DELTA_END = "]";
private static final String DELTA_START = "[";
private int fContextLength;
private String fExpected;
private String fActual;
private int fPrefix;
private int fSuffix;
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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