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

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