1 /** 2 * ****************************************************************************** 3 * Copyright (C) 1996-2005, International Business Machines Corporation and * 4 * others. All Rights Reserved. * 5 * ****************************************************************************** 6 * 7 * 8 * ****************************************************************************** 9 */ 10 11 package libcore.icu; 12 13 import java.text.CollationKey; 14 15 /** 16 * A concrete implementation of the abstract java.text.CollationKey. 17 */ 18 public final class CollationKeyICU extends CollationKey { 19 /** 20 * The key. 21 */ 22 private final android.icu.text.CollationKey key; 23 24 public CollationKeyICU(String source, android.icu.text.CollationKey key) { 25 super(source); 26 this.key = key; 27 } 28 29 @Override 30 public int compareTo(CollationKey other) { 31 final android.icu.text.CollationKey otherKey; 32 if (other instanceof CollationKeyICU) { 33 otherKey = ((CollationKeyICU) other).key; 34 } else { 35 otherKey = new android.icu.text.CollationKey(other.getSourceString(), 36 other.toByteArray()); 37 } 38 39 return key.compareTo(otherKey); 40 } 41 42 @Override 43 public boolean equals(Object object) { 44 if (object == this) { 45 return true; 46 } 47 if (!(object instanceof CollationKey)) { 48 return false; 49 } 50 return compareTo((CollationKey) object) == 0; 51 } 52 53 /** 54 * Creates a hash code for this CollationKey. 55 * Compute the hash by iterating sparsely over about 32 (up to 63) bytes 56 * spaced evenly through the string. For each byte, multiply the previous 57 * hash value by a prime number and add the new byte in, like a linear 58 * congruential random number generator, producing a pseudo-random 59 * deterministic value well distributed over the output range. 60 * 61 * @return hash value of collation key. Hash value is never 0. 62 * @stable ICU 2.4 63 */ 64 @Override 65 public int hashCode() { 66 return key.hashCode(); 67 } 68 69 @Override 70 public byte[] toByteArray() { 71 return key.toByteArray(); 72 } 73 } 74
