1 package junit.framework; 2 3 // android-changed add @hide 4 /** 5 * @hide not needed for public API 6 */ 7 public class ComparisonCompactor { 8 9 private static final String ELLIPSIS= "..."; 10 private static final String DELTA_END= "]"; 11 private static final String DELTA_START= "["; 12 13 private int fContextLength; 14 private String fExpected; 15 private String fActual; 16 private int fPrefix; 17 private int fSuffix; 18 19 public ComparisonCompactor(int contextLength, String expected, String actual) { 20 fContextLength= contextLength; 21 fExpected= expected; 22 fActual= actual; 23 } 24 25 public String compact(String message) { 26 if (fExpected == null || fActual == null || areStringsEqual()) { 27 // android-changed use local method instead of Assert.format, since 28 // the later is not part of Android API till API 16 29 return format(message, fExpected, fActual); 30 } 31 findCommonPrefix(); 32 findCommonSuffix(); 33 String expected= compactString(fExpected); 34 String actual= compactString(fActual); 35 // android-changed use local format method 36 return format(message, expected, actual); 37 } 38 39 private String compactString(String source) { 40 String result= DELTA_START + source.substring(fPrefix, source.length() - fSuffix + 1) + DELTA_END; 41 if (fPrefix > 0) 42 result= computeCommonPrefix() + result; 43 if (fSuffix > 0) 44 result= result + computeCommonSuffix(); 45 return result; 46 } 47 48 private void findCommonPrefix() { 49 fPrefix= 0; 50 int end= Math.min(fExpected.length(), fActual.length()); 51 for (; fPrefix < end; fPrefix++) { 52 if (fExpected.charAt(fPrefix) != fActual.charAt(fPrefix)) 53 break; 54 } 55 } 56 57 private void findCommonSuffix() { 58 int expectedSuffix= fExpected.length() - 1; 59 int actualSuffix= fActual.length() - 1; 60 for (; actualSuffix >= fPrefix && expectedSuffix >= fPrefix; actualSuffix--, expectedSuffix--) { 61 if (fExpected.charAt(expectedSuffix) != fActual.charAt(actualSuffix)) 62 break; 63 } 64 fSuffix= fExpected.length() - expectedSuffix; 65 } 66 67 private String computeCommonPrefix() { 68 return (fPrefix > fContextLength ? ELLIPSIS : "") + fExpected.substring(Math.max(0, fPrefix - fContextLength), fPrefix); 69 } 70 71 private String computeCommonSuffix() { 72 int end= Math.min(fExpected.length() - fSuffix + 1 + fContextLength, fExpected.length()); 73 return fExpected.substring(fExpected.length() - fSuffix + 1, end) + (fExpected.length() - fSuffix + 1 < fExpected.length() - fContextLength ? ELLIPSIS : ""); 74 } 75 76 private boolean areStringsEqual() { 77 return fExpected.equals(fActual); 78 } 79 80 // android-changed copy of Assert.format for reasons described above 81 private static String format(String message, Object expected, Object actual) { 82 String formatted= ""; 83 if (message != null && message.length() > 0) 84 formatted= message+" "; 85 return formatted+"expected:<"+expected+"> but was:<"+actual+">"; 86 } 87 } 88
