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Diffstat (limited to 'src/org/apache/commons/codec/StringEncoderComparator.java')
-rw-r--r-- | src/org/apache/commons/codec/StringEncoderComparator.java | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/org/apache/commons/codec/StringEncoderComparator.java b/src/org/apache/commons/codec/StringEncoderComparator.java new file mode 100644 index 0000000..6d29af2 --- /dev/null +++ b/src/org/apache/commons/codec/StringEncoderComparator.java @@ -0,0 +1,83 @@ +/* + * Copyright 2001-2004 The Apache Software Foundation. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.commons.codec; + +import java.util.Comparator; + +/** + * Strings are comparable, and this comparator allows + * you to configure it with an instance of a class + * which implements StringEncoder. This comparator + * is used to sort Strings by an encoding scheme such + * as Soundex, Metaphone, etc. This class can come in + * handy if one need to sort Strings by an encoded + * form of a name such as Soundex. + * + * @author Apache Software Foundation + * @version $Id: StringEncoderComparator.java,v 1.14 2004/06/21 23:24:17 ggregory Exp $ + */ +public class StringEncoderComparator implements Comparator { + + /** + * Internal encoder instance. + */ + private StringEncoder stringEncoder; + + /** + * Constructs a new instance. + */ + public StringEncoderComparator() { + // no init. + } + + /** + * Constructs a new instance with the given algorithm. + * @param stringEncoder the StringEncoder used for comparisons. + */ + public StringEncoderComparator(StringEncoder stringEncoder) { + this.stringEncoder = stringEncoder; + } + + /** + * Compares two strings based not on the strings + * themselves, but on an encoding of the two + * strings using the StringEncoder this Comparator + * was created with. + * + * If an {@link EncoderException} is encountered, return <code>0</code>. + * + * @param o1 the object to compare + * @param o2 the object to compare to + * @return the Comparable.compareTo() return code or 0 if an encoding error was caught. + * @see Comparable + */ + public int compare(Object o1, Object o2) { + + int compareCode = 0; + + try { + Comparable s1 = (Comparable) ((Encoder) this.stringEncoder).encode(o1); + Comparable s2 = (Comparable) ((Encoder) this.stringEncoder).encode(o2); + compareCode = s1.compareTo(s2); + } + catch (EncoderException ee) { + compareCode = 0; + } + return compareCode; + } + +} |