bundles/org.simantics.mapping/src/org/simantics/mapping/constraint/instructions/CombinedInstruction.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.constraint.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.mapping.IContextualModification;
  21
  22 public abstract class CombinedInstruction implements IInstruction {
  23         IInstruction[] instructions;
  24
  25         public CombinedInstruction(IInstruction... instructions) {
  26                 this.instructions = instructions;
  27         }
  28
  29         class CompositeClaim implements IContextualModification {
  30
  31                 IContextualModification modification;
  32                 int instructionId;
  33
  34                 public CompositeClaim(IContextualModification modification, int instructionId) {
  35                         this.modification = modification;
  36                         this.instructionId = instructionId;
  37                 }
  38
  39                 @Override
  40                 public void perform(WriteGraph g, Object[] bindings) throws DatabaseException {
  41                         modification.perform(g, bindings);
  42                         for(int i=instructionId+1;i<instructions.length;++i)
  43                                 instructions[i].doClaim(g, bindings);
  44                 }
  45
  46         }
  47
  48         @Override
  49         public IContextualModification claim(ReadGraph g, Object[] bindings) throws DatabaseException {
  50                 for(int instructionId=0;instructionId<instructions.length;++instructionId) {
  51                         IContextualModification modification = instructions[instructionId].claim(g, bindings);
  52                         if(modification != null) {
  53                                 if(instructionId==instructions.length-1)
  54                                         return modification;
  55                                 else
  56                                         return new CompositeClaim(modification, instructionId);
  57                         }
  58                 }
  59                 return null;
  60         }
  61
  62         class CompositeDeny implements IContextualModification {
  63
  64                 IContextualModification modification;
  65                 int instructionId;
  66
  67                 public CompositeDeny(IContextualModification modification, int instructionId) {
  68                         this.modification = modification;
  69                         this.instructionId = instructionId;
  70                 }
  71
  72                 @Override
  73                 public void perform(WriteGraph g, Object[] bindings) throws DatabaseException {
  74                         modification.perform(g, bindings);
  75                         for(int i=instructionId+1;i<instructions.length;++i)
  76                                 instructions[i].doDeny(g, bindings);
  77                 }
  78
  79         }
  80
  81         @Override
  82         public IContextualModification deny(ReadGraph g, Object[] bindings) throws DatabaseException {
  83                 for(int instructionId=0;instructionId<instructions.length;++instructionId) {
  84                         IContextualModification modification = instructions[instructionId].deny(g, bindings);
  85                         if(modification != null) {
  86                                 if(instructionId==instructions.length-1)
  87                                         return modification;
  88                                 else
  89                                         return new CompositeDeny(modification, instructionId);
  90                         }
  91                 }
  92                 return null;
  93         }
  94
  95         @Override
  96         public void doClaim(WriteGraph g, Object[] bindings) throws DatabaseException {
  97                 for(int i=0;i<instructions.length;++i)
  98                         instructions[i].doClaim(g, bindings);
  99         }
 100
 101         @Override
 102         public void doDeny(WriteGraph g, Object[] bindings) throws DatabaseException {
 103                 for(int i=0;i<instructions.length;++i)
 104                         instructions[i].doDeny(g, bindings);
 105         }
 106
 107         @Override
 108         public void collectVariables(TIntHashSet reads, TIntHashSet writes) {
 109                 for(IInstruction inst : instructions)
 110                         inst.collectVariables(reads, writes);
 111         }
 112
 113         @Override
 114         public void mapVariables(TIntIntHashMap map) {
 115                 for(IInstruction inst : instructions)
 116                         inst.mapVariables(map);
 117         }
 118
 119 }