bundles/org.simantics.mapping/src/org/simantics/mapping/rule/instructions/UnlessRuleInstruction.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.mapping.rule.instructions;\r
  13 \r
  14 import gnu.trove.map.hash.TIntIntHashMap;\r
  15 import gnu.trove.set.hash.TIntHashSet;\r
  16 \r
  17 import org.simantics.db.ReadGraph;\r
  18 import org.simantics.db.WriteGraph;\r
  19 import org.simantics.db.exception.DatabaseException;\r
  20 import org.simantics.layer0.utils.triggers.IModification;\r
  21 import org.simantics.mapping.constraint.instructions.IInstruction;\r
  22 \r
  23 public class UnlessRuleInstruction implements IRuleInstruction {\r
  24         IInstruction condition;\r
  25         IRuleInstruction rule;\r
  26         \r
  27         public UnlessRuleInstruction(IInstruction condition, IRuleInstruction rule) {\r
  28                 this.condition = condition;\r
  29                 this.rule = rule;\r
  30         }\r
  31         \r
  32         @Override\r
  33         public IModification execute(ReadGraph g, Object[] bindings) throws DatabaseException {\r
  34                 if(DEBUG)\r
  35                         System.out.println("UnlessRuleInstruction.execute: condition");\r
  36                 Object cont = condition.query(g, bindings);\r
  37                 if(cont == IInstruction.FAILURE) {\r
  38                         if(DEBUG)\r
  39                                 System.out.println("UnlessRuleInstruction.execute: execute");\r
  40                         return rule.execute(g, bindings);\r
  41                 }\r
  42                 return null;\r
  43         }\r
  44 \r
  45         @Override\r
  46         public void doExecute(WriteGraph g, Object[] bindings) throws DatabaseException {\r
  47                 if(DEBUG)\r
  48                         System.out.println("UnlessRuleInstruction.doExecute: condition");\r
  49                 Object cont = condition.query(g, bindings);\r
  50                 if(cont == IInstruction.FAILURE) {\r
  51                         if(DEBUG)\r
  52                                 System.out.println("UnlessRuleInstruction.doExecute: execute");\r
  53                         rule.doExecute(g, bindings);\r
  54                 }\r
  55         }\r
  56         \r
  57         @Override\r
  58         public void collectVariables(TIntHashSet reads, TIntHashSet writes) {\r
  59                 condition.collectVariables(reads, writes);\r
  60                 rule.collectVariables(reads, writes);\r
  61         }\r
  62 \r
  63         @Override\r
  64         public void mapVariables(TIntIntHashMap map) {\r
  65                 condition.mapVariables(map);\r
  66                 rule.mapVariables(map);\r
  67         }\r
  68         \r
  69         @Override\r
  70         public void toString(StringBuilder b, int indent) {             \r
  71                 b.append("unless ");\r
  72                 condition.toString(b, indent+1);\r
  73                 b.append('\n');\r
  74                 \r
  75                 for(int i=0;i<indent;++i)\r
  76                         b.append(INDENTATION);\r
  77                 b.append("then ");\r
  78                 rule.toString(b, indent+1);     \r
  79         }\r
  80 }\r