1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.mapping.constraint.instructions;
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14 import org.simantics.db.ReadGraph;
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15 import org.simantics.db.exception.DatabaseException;
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17 public class AndInstruction extends CombinedInstruction {
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19 public AndInstruction(IInstruction... instructions) {
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20 super(instructions);
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23 static class Continuation {
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24 Object continuation;
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28 public Continuation(Object continuation, int instructionId,
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29 Continuation next) {
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30 this.continuation = continuation;
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31 this.instructionId = instructionId;
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38 public Object query(ReadGraph g, Object[] bindings) throws DatabaseException {
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39 Continuation ret = null;
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40 int instructionId = 0;
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41 while(instructionId < instructions.length) {
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43 System.out.println("AndInstruction.query " + instructionId + "/" + instructions.length);
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44 Object continuation = instructions[instructionId].query(g, bindings);
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45 if(continuation == IInstruction.FAILURE) {
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48 return IInstruction.FAILURE;
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49 instructionId = ret.instructionId;
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50 continuation = instructions[instructionId].next(g, bindings, ret.continuation);
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51 if(continuation == IInstruction.FAILURE) {
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55 if(continuation == null)
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58 ret.continuation = continuation;
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62 else if(continuation != null)
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63 ret = new Continuation(continuation, instructionId, ret);
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70 public Object next(ReadGraph g, Object[] bindings, Object ret_) throws DatabaseException {
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71 Continuation ret = (Continuation)ret_;
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75 return IInstruction.FAILURE;
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76 instructionId = ret.instructionId;
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77 Object continuation =
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78 instructions[instructionId].next(g, bindings, ret.continuation);
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79 if(continuation == IInstruction.FAILURE) {
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83 if(continuation == null)
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86 ret.continuation = continuation;
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90 while(instructionId < instructions.length) {
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91 Object continuation = instructions[instructionId].query(g, bindings);
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92 if(continuation == IInstruction.FAILURE) {
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95 return IInstruction.FAILURE;
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96 instructionId = ret.instructionId;
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97 continuation = instructions[instructionId].next(g, bindings, ret.continuation);
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98 if(continuation == IInstruction.FAILURE) {
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102 if(continuation == null)
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105 ret.continuation = continuation;
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109 else if(continuation != null)
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110 ret = new Continuation(continuation, instructionId, ret);
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117 public void toString(StringBuilder b, int indent) {
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119 boolean first = true;
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120 for(IInstruction inst : instructions) {
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125 for(int i=0;i<indent+1;++i)
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126 b.append(INDENTATION);
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128 inst.toString(b, indent + 1);
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131 for(int i=0;i<indent;++i)
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132 b.append(INDENTATION);
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