/*

  * Copyright 2004-2008 the Seasar Foundation and the Others.

  *

  * 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.seasar.uruma.viewer;

 import java.io.Serializable;

 import java.util.Comparator;

 import org.seasar.framework.util.StringUtil;

 /**

  * 文字列と数値による比較を行う {@link Comparator} です。<br />

  * 

  * @author y-komori

  */

 public class StringAndNumberComparator implements Comparator<Object>,

         Serializable {

     private static final long serialVersionUID = 12087223297593031L;

     /*

      * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)

      */

     public int compare(final Object o1, final Object o2) {

         if ((o1 instanceof String) && (o2 instanceof String)) {

             String s1 = (String) o1;

             String s2 = (String) o2;

             if (StringUtil.isNumber(s1) && StringUtil.isNumber(s2)) {

                 return Long.valueOf(s1).compareTo(Long.valueOf(s2));

             } else {

                 return s1.compareTo(s2);

             }

         } else {

             return 0;

         }

     }

 }