bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/collections/ConditionalList.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.collections;\r
  13 \r
  14 import java.util.Collection;\r
  15 \r
  16 import org.simantics.db.Resource;\r
  17 import org.simantics.db.ReadGraph;\r
  18 import org.simantics.db.exception.DatabaseException;\r
  19 import org.simantics.layer0.utils.operations.IOperation;\r
  20 import org.simantics.layer0.utils.predicates.IUnaryPredicate;\r
  21 import org.simantics.utils.datastructures.persistent.IContextMap;\r
  22 \r
  23 public class ConditionalList implements IContextualList {\r
  24 \r
  25         IUnaryPredicate predicate;\r
  26         Resource thenElement;\r
  27         Resource elseElement;\r
  28 \r
  29         public ConditionalList(IUnaryPredicate predicate, Resource thenElement,\r
  30                         Resource elseElement) {\r
  31                 this.predicate = predicate;\r
  32                 this.thenElement = thenElement;\r
  33                 this.elseElement = elseElement;\r
  34         }\r
  35 \r
  36         @Override\r
  37         public void fill(ReadGraph g, IContextMap parameters, Collection<Resource> c) throws DatabaseException {\r
  38                 Resource r = (Resource)parameters.get(IOperation.SUBJECT);\r
  39                 \r
  40                 if(predicate.has(g, r))\r
  41                         ContextualListUtils.fill(g, thenElement, parameters, c);\r
  42                 else if(elseElement != null)\r
  43                         ContextualListUtils.fill(g, elseElement, parameters, c);\r
  44         }\r
  45 \r
  46 }\r