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| 1 | +/* | |
| 2 | + * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +/* | |
| 27 | + * (C) Copyright Taligent, Inc. 1996 - All Rights Reserved | |
| 28 | + * (C) Copyright IBM Corp. 1996 - All Rights Reserved | |
| 29 | + * | |
| 30 | + * The original version of this source code and documentation is copyrighted | |
| 31 | + * and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These | |
| 32 | + * materials are provided under terms of a License Agreement between Taligent | |
| 33 | + * and Sun. This technology is protected by multiple US and International | |
| 34 | + * patents. This notice and attribution to Taligent may not be removed. | |
| 35 | + * Taligent is a registered trademark of Taligent, Inc. | |
| 36 | + * | |
| 37 | + */ | |
| 38 | + | |
| 39 | +package java.text; | |
| 40 | + | |
| 41 | +/** | |
| 42 | + * A RuleBasedCollationKey is a concrete implementation of CollationKey class. | |
| 43 | + * The RuleBasedCollationKey class is used by the RuleBasedCollator class. | |
| 44 | + */ | |
| 45 | + | |
| 46 | +final class RuleBasedCollationKey extends CollationKey { | |
| 47 | + /** | |
| 48 | + * Compare this RuleBasedCollationKey to target. The collation rules of the | |
| 49 | + * Collator object which created these keys are applied. <strong>Note:</strong> | |
| 50 | + * RuleBasedCollationKeys created by different Collators can not be compared. | |
| 51 | + * @param target target RuleBasedCollationKey | |
| 52 | + * @return Returns an integer value. Value is less than zero if this is less | |
| 53 | + * than target, value is zero if this and target are equal and value is greater than | |
| 54 | + * zero if this is greater than target. | |
| 55 | + * @see java.text.Collator#compare | |
| 56 | + */ | |
| 57 | + public int compareTo(CollationKey target) | |
| 58 | + { | |
| 59 | + int result = key.compareTo(((RuleBasedCollationKey)(target)).key); | |
| 60 | + if (result <= Collator.LESS) | |
| 61 | + return Collator.LESS; | |
| 62 | + else if (result >= Collator.GREATER) | |
| 63 | + return Collator.GREATER; | |
| 64 | + return Collator.EQUAL; | |
| 65 | + } | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Compare this RuleBasedCollationKey and the target for equality. | |
| 69 | + * The collation rules of the Collator object which created these keys are applied. | |
| 70 | + * <strong>Note:</strong> RuleBasedCollationKeys created by different Collators can not be | |
| 71 | + * compared. | |
| 72 | + * @param target the RuleBasedCollationKey to compare to. | |
| 73 | + * @return Returns true if two objects are equal, false otherwise. | |
| 74 | + */ | |
| 75 | + public boolean equals(Object target) { | |
| 76 | + if (this == target) return true; | |
| 77 | + if (target == null || !getClass().equals(target.getClass())) { | |
| 78 | + return false; | |
| 79 | + } | |
| 80 | + RuleBasedCollationKey other = (RuleBasedCollationKey)target; | |
| 81 | + return key.equals(other.key); | |
| 82 | + } | |
| 83 | + | |
| 84 | + /** | |
| 85 | + * Creates a hash code for this RuleBasedCollationKey. The hash value is calculated on the | |
| 86 | + * key itself, not the String from which the key was created. Thus | |
| 87 | + * if x and y are RuleBasedCollationKeys, then x.hashCode(x) == y.hashCode() if | |
| 88 | + * x.equals(y) is true. This allows language-sensitive comparison in a hash table. | |
| 89 | + * See the CollatinKey class description for an example. | |
| 90 | + * @return the hash value based on the string's collation order. | |
| 91 | + */ | |
| 92 | + public int hashCode() { | |
| 93 | + return (key.hashCode()); | |
| 94 | + } | |
| 95 | + | |
| 96 | + /** | |
| 97 | + * Converts the RuleBasedCollationKey to a sequence of bits. If two RuleBasedCollationKeys | |
| 98 | + * could be legitimately compared, then one could compare the byte arrays | |
| 99 | + * for each of those keys to obtain the same result. Byte arrays are | |
| 100 | + * organized most significant byte first. | |
| 101 | + */ | |
| 102 | + public byte[] toByteArray() { | |
| 103 | + | |
| 104 | + char[] src = key.toCharArray(); | |
| 105 | + byte[] dest = new byte[ 2*src.length ]; | |
| 106 | + int j = 0; | |
| 107 | + for( int i=0; i<src.length; i++ ) { | |
| 108 | + dest[j++] = (byte)(src[i] >>> 8); | |
| 109 | + dest[j++] = (byte)(src[i] & 0x00ff); | |
| 110 | + } | |
| 111 | + return dest; | |
| 112 | + } | |
| 113 | + | |
| 114 | + /** | |
| 115 | + * A RuleBasedCollationKey can only be generated by Collator objects. | |
| 116 | + */ | |
| 117 | + RuleBasedCollationKey(String source, String key) { | |
| 118 | + super(source); | |
| 119 | + this.key = key; | |
| 120 | + } | |
| 121 | + private String key = null; | |
| 122 | + | |
| 123 | +} | |