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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   package org.apache.pdfbox.util;
   18   
   19   import java.util.Map;
   20   
   21   
   22   /**
   23    * This class with handle some simple Map operations.
   24    *
   25    * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
   26    * @version $Revision: 1.2 $
   27    */
   28   public class MapUtil
   29   {
   30       private MapUtil()
   31       {
   32           //utility class
   33       }
   34   
   35       /**
   36        * Generate a unique key for the map based on a prefix.
   37        *
   38        * @param map The map to look for existing keys.
   39        * @param prefix The prefix to use when generating the key.
   40        * @return The new unique key that does not currently exist in the map.
   41        */
   42       public static final String getNextUniqueKey( Map map, String prefix )
   43       {
   44           int counter = 0;
   45           while( map.get( prefix+counter ) != null )
   46           {
   47               counter++;
   48           }
   49           return prefix+counter;
   50       }
   51   }

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