bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/NameMap.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.layer0.utils;\r
  13 \r
  14 import java.util.HashMap;\r
  15 import java.util.Map;\r
  16 \r
  17 import org.simantics.db.Resource;\r
  18 \r
  19 /**\r
  20  * Service that creates unique names for resources and\r
  21  * resource paths. \r
  22  */\r
  23 public class NameMap {\r
  24 \r
  25     int maxLength;\r
  26     Map<Resource, String> cache = new HashMap<Resource, String>();\r
  27     int curId = 0;\r
  28     \r
  29     public NameMap(int maxLength) {\r
  30         this.maxLength = maxLength;\r
  31     }\r
  32     \r
  33     protected boolean isValid(String name) {\r
  34         return true;\r
  35     }\r
  36     \r
  37     private static final int charA = 65;\r
  38     private static final int char0 = 48 - 26;\r
  39     \r
  40     public void clear() {\r
  41         curId = 0;\r
  42         cache.clear();\r
  43     }\r
  44     \r
  45     public String getName(Resource resource) {\r
  46         String ret = cache.get(resource);\r
  47         while(ret == null) {\r
  48             int id = curId++;\r
  49             byte[] c = new byte[5];\r
  50             c[0] = '@';\r
  51             for(int i=0;i<4;++i) {\r
  52                 int lid = id%36;\r
  53                 if(lid < 26)\r
  54                     c[4-i] = (byte)(charA + lid);\r
  55                 else\r
  56                     c[4-i] = (byte)(char0 + lid);\r
  57                 id /= 36;\r
  58             }                \r
  59             ret = new String(c);\r
  60             if(isValid(ret))\r
  61                 cache.put(resource, ret);\r
  62             else\r
  63                 ret = null;\r
  64         }\r
  65         return ret;\r
  66     }\r
  67     \r
  68     public static void main(String[] args) {\r
  69                 NameMap m = new NameMap(24);\r
  70                 for(int i=0;i<100;++i)\r
  71                         System.out.println(m.getName(new Resource() {\r
  72 \r
  73                                 @Override\r
  74                                 public int getThreadHash() {\r
  75                                         return hashCode();\r
  76                                 }\r
  77                                 \r
  78                                 @Override\r
  79                                 public long getResourceId() {\r
  80                                         return 3;\r
  81                                 }\r
  82 \r
  83                                 @Override\r
  84                                 public Resource get() {\r
  85                                         return this;\r
  86                                 }\r
  87 \r
  88                                 @Override\r
  89                                 public boolean isPersistent() {\r
  90                                         return false;\r
  91                                 }\r
  92                                 \r
  93                                 @Override\r
  94                                 public int compareTo(Resource o) {\r
  95                                         // TODO Auto-generated method stub\r
  96                                         return 0;\r
  97                                 }\r
  98 \r
  99                                 @Override\r
 100                                 public boolean equalsResource(Resource other) {\r
 101                                         return equals(other);\r
 102                                 }\r
 103                                 \r
 104                         }));\r
 105                         \r
 106         }\r
 107     \r
 108     public String getName(Resource[] resources) {\r
 109         String ret = "";\r
 110         for(Resource r : resources)\r
 111             ret += getName(r);\r
 112         return ret;\r
 113     }\r
 114     \r
 115 }\r