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