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+/*
+ * 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;
+ }
+
+}