bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AbstractSymbolProvider.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.diagram.symbolcontribution;\r
  13 \r
  14 import java.util.Collection;\r
  15 import java.util.Collections;\r
  16 import java.util.HashSet;\r
  17 import java.util.Set;\r
  18 \r
  19 import org.simantics.diagram.symbollibrary.ISymbolGroup;\r
  20 \r
  21 public abstract class AbstractSymbolProvider implements ISymbolProvider {\r
  22     protected volatile boolean         disposed = false;\r
  23     protected Runnable                 listener;\r
  24     protected Collection<ISymbolGroup> groups   = Collections.emptyList();\r
  25     private Set<ISymbolGroup>          groupSet = null;\r
  26 \r
  27     public Collection<ISymbolGroup> getSymbolGroups() {\r
  28         return groups;\r
  29     }\r
  30 \r
  31     public void setListener(Runnable listener) {\r
  32         this.listener = listener;\r
  33     }\r
  34 \r
  35     public void dispose() {\r
  36         disposed = true;\r
  37     }\r
  38 \r
  39     void setSymbolGroup(Collection<ISymbolGroup> groups) {\r
  40         if (groups == null)\r
  41             throw new NullPointerException("null groups");\r
  42         this.groups = groups;\r
  43     }\r
  44 \r
  45     protected Set<ISymbolGroup> getSymbolGroupSet() {\r
  46         synchronized (this) {\r
  47             if (groupSet != null)\r
  48                 return groupSet;\r
  49             groupSet = new HashSet<ISymbolGroup>(getSymbolGroups());\r
  50             return groupSet;\r
  51         }\r
  52     }\r
  53 \r
  54     void lockGroups() {\r
  55         groups = Collections.unmodifiableCollection(groups);\r
  56         groupSet = null;\r
  57         getSymbolGroupSet();\r
  58     }\r
  59 \r
  60     @Override\r
  61     public int hashCode() {\r
  62         return getSymbolGroupSet().hashCode();\r
  63     }\r
  64 \r
  65     @Override\r
  66     public boolean equals(Object obj) {\r
  67         if (this == obj)\r
  68             return true;\r
  69         if (obj == null)\r
  70             return false;\r
  71         if (!(obj instanceof AbstractSymbolProvider))\r
  72             return false;\r
  73         AbstractSymbolProvider other = (AbstractSymbolProvider) obj;\r
  74         return getSymbolGroupSet().equals( other.getSymbolGroupSet() );\r
  75     }\r
  76 \r
  77 }\r