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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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;

/**
 * Compares Strings using a {@link 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.
 *
 * 

This class is immutable and thread-safe.

* * @version $Id$ */ @SuppressWarnings("rawtypes") // TODO ought to implement Comparator but that's not possible whilst maintaining binary compatibility. public class StringEncoderComparator implements Comparator { /** * Internal encoder instance. */ private final StringEncoder stringEncoder; /** * Constructs a new instance. * * @deprecated Creating an instance without a {@link StringEncoder} leads to a {@link NullPointerException}. Will be * removed in 2.0. */ @Deprecated public StringEncoderComparator() { this.stringEncoder = null; // Trying to use this will cause things to break } /** * Constructs a new instance with the given algorithm. * * @param stringEncoder * the StringEncoder used for comparisons. */ public StringEncoderComparator(final 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 0. * * @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 */ @Override public int compare(final Object o1, final Object o2) { int compareCode = 0; try { @SuppressWarnings("unchecked") // May fail with CCE if encode returns something that is not Comparable // However this was always the case. final Comparable> s1 = (Comparable>) this.stringEncoder.encode(o1); final Comparable s2 = (Comparable) this.stringEncoder.encode(o2); compareCode = s1.compareTo(s2); } catch (final EncoderException ee) { compareCode = 0; } return compareCode; } }




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