Source Code Cross Referenced for StringEncoderComparator.java in  » Library » Apache-common-codec » org » apache » commons » codec » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache common codec » org.apache.commons.codec 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2001-2004 The Apache Software Foundation.
03:         * 
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         * 
08:         *      http://www.apache.org/licenses/LICENSE-2.0
09:         * 
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */
16:
17:        package org.apache.commons.codec;
18:
19:        import java.util.Comparator;
20:
21:        /**
22:         * Strings are comparable, and this comparator allows 
23:         * you to configure it with an instance of a class
24:         * which implements StringEncoder.  This comparator
25:         * is used to sort Strings by an encoding scheme such
26:         * as Soundex, Metaphone, etc.  This class can come in
27:         * handy if one need to sort Strings by an encoded
28:         * form of a name such as Soundex.
29:         *
30:         * @author Apache Software Foundation
31:         * @version $Id: StringEncoderComparator.java,v 1.14 2004/06/21 23:24:17 ggregory Exp $
32:         */
33:        public class StringEncoderComparator implements  Comparator {
34:
35:            /**
36:             * Internal encoder instance.
37:             */
38:            private StringEncoder stringEncoder;
39:
40:            /**
41:             * Constructs a new instance.
42:             */
43:            public StringEncoderComparator() {
44:                // no init.
45:            }
46:
47:            /**
48:             * Constructs a new instance with the given algorithm.
49:             * @param stringEncoder the StringEncoder used for comparisons.
50:             */
51:            public StringEncoderComparator(StringEncoder stringEncoder) {
52:                this .stringEncoder = stringEncoder;
53:            }
54:
55:            /**
56:             * Compares two strings based not on the strings 
57:             * themselves, but on an encoding of the two 
58:             * strings using the StringEncoder this Comparator
59:             * was created with.
60:             * 
61:             * If an {@link EncoderException} is encountered, return <code>0</code>.
62:             * 
63:             * @param o1 the object to compare
64:             * @param o2 the object to compare to
65:             * @return the Comparable.compareTo() return code or 0 if an encoding error was caught.
66:             * @see Comparable
67:             */
68:            public int compare(Object o1, Object o2) {
69:
70:                int compareCode = 0;
71:
72:                try {
73:                    Comparable s1 = (Comparable) ((Encoder) this .stringEncoder)
74:                            .encode(o1);
75:                    Comparable s2 = (Comparable) ((Encoder) this .stringEncoder)
76:                            .encode(o2);
77:                    compareCode = s1.compareTo(s2);
78:                } catch (EncoderException ee) {
79:                    compareCode = 0;
80:                }
81:                return compareCode;
82:            }
83:
84:        }
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