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RuleBasedCollationKey.java
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123 lines (113 loc) · 3.94 KB
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/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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/*
* (C) Copyright Taligent, Inc. 1996 - All Rights Reserved
* (C) Copyright IBM Corp. 1996 - All Rights Reserved
*
* The original version of this source code and documentation is copyrighted
* and owned by Taligent, Inc., a wholly-owned subsidiary of IBM. These
* materials are provided under terms of a License Agreement between Taligent
* and Sun. This technology is protected by multiple US and International
* patents. This notice and attribution to Taligent may not be removed.
* Taligent is a registered trademark of Taligent, Inc.
*
*/
package java.text;
/**
* A RuleBasedCollationKey is a concrete implementation of CollationKey class.
* The RuleBasedCollationKey class is used by the RuleBasedCollator class.
*/
final class RuleBasedCollationKey extends CollationKey {
/**
* Compare this RuleBasedCollationKey to target. The collation rules of the
* Collator object which created these keys are applied. <strong>Note:</strong>
* RuleBasedCollationKeys created by different Collators can not be compared.
* @param target target RuleBasedCollationKey
* @return Returns an integer value. Value is less than zero if this is less
* than target, value is zero if this and target are equal and value is greater than
* zero if this is greater than target.
* @see java.text.Collator#compare
*/
public int compareTo(CollationKey target)
{
int result = key.compareTo(((RuleBasedCollationKey)(target)).key);
if (result <= Collator.LESS)
return Collator.LESS;
else if (result >= Collator.GREATER)
return Collator.GREATER;
return Collator.EQUAL;
}
/**
* Compare this RuleBasedCollationKey and the target for equality.
* The collation rules of the Collator object which created these keys are applied.
* <strong>Note:</strong> RuleBasedCollationKeys created by different Collators can not be
* compared.
* @param target the RuleBasedCollationKey to compare to.
* @return Returns true if two objects are equal, false otherwise.
*/
public boolean equals(Object target) {
if (this == target) return true;
if (target == null || !getClass().equals(target.getClass())) {
return false;
}
RuleBasedCollationKey other = (RuleBasedCollationKey)target;
return key.equals(other.key);
}
/**
* Creates a hash code for this RuleBasedCollationKey. The hash value is calculated on the
* key itself, not the String from which the key was created. Thus
* if x and y are RuleBasedCollationKeys, then x.hashCode(x) == y.hashCode() if
* x.equals(y) is true. This allows language-sensitive comparison in a hash table.
* See the CollatinKey class description for an example.
* @return the hash value based on the string's collation order.
*/
public int hashCode() {
return (key.hashCode());
}
/**
* Converts the RuleBasedCollationKey to a sequence of bits. If two RuleBasedCollationKeys
* could be legitimately compared, then one could compare the byte arrays
* for each of those keys to obtain the same result. Byte arrays are
* organized most significant byte first.
*/
public byte[] toByteArray() {
char[] src = key.toCharArray();
byte[] dest = new byte[ 2*src.length ];
int j = 0;
for( int i=0; i<src.length; i++ ) {
dest[j++] = (byte)(src[i] >>> 8);
dest[j++] = (byte)(src[i] & 0x00ff);
}
return dest;
}
/**
* A RuleBasedCollationKey can only be generated by Collator objects.
*/
RuleBasedCollationKey(String source, String key) {
super(source);
this.key = key;
}
private String key = null;
}