bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/viewpoints/LazyContainerViewpoint.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.browsing.ui.common.viewpoints;\r
  13 \r
  14 import org.simantics.browsing.ui.NodeContext;\r
  15 import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
  16 import org.simantics.browsing.ui.content.Viewpoint;\r
  17 \r
  18 public class LazyContainerViewpoint implements Viewpoint {\r
  19 \r
  20     private NodeContext[] children = Viewpoint.PENDING_CHILDREN;\r
  21     private Boolean        hasChildren = Viewpoint.PENDING_HAS_CHILDREN;\r
  22 \r
  23     public LazyContainerViewpoint() {\r
  24     }\r
  25 \r
  26     public LazyContainerViewpoint(NodeContext[] children) {\r
  27         this.children = children;\r
  28         this.hasChildren = children.length > 0;\r
  29     }\r
  30 \r
  31     public void setChildren(PrimitiveQueryUpdater updater, NodeContext[] children) {\r
  32         for(NodeContext c : children) updater.incRef(c);\r
  33         for(NodeContext c : this.children) updater.decRef(c);\r
  34         this.children = children;\r
  35     }\r
  36 \r
  37     public void setHasChildren(Boolean hasChildren) {\r
  38         this.hasChildren = hasChildren;\r
  39     }\r
  40 \r
  41     @Override\r
  42     public NodeContext[] getChildren() {\r
  43         return children;\r
  44     }\r
  45 \r
  46     @Override\r
  47     public Boolean getHasChildren() {\r
  48         return hasChildren;\r
  49     }\r
  50 \r
  51 }\r