1 /*******************************************************************************
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2 * Copyright (c) 2010 Association for Decentralized Information Management in
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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.databoard.binding.util;
14 import java.util.Map;
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15 import java.util.WeakHashMap;
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17 import org.simantics.databoard.Bindings;
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18 import org.simantics.databoard.binding.ArrayBinding;
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19 import org.simantics.databoard.binding.Binding;
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20 import org.simantics.databoard.binding.Binding.Visitor;
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21 import org.simantics.databoard.binding.BooleanBinding;
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22 import org.simantics.databoard.binding.ByteBinding;
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23 import org.simantics.databoard.binding.DoubleBinding;
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24 import org.simantics.databoard.binding.FloatBinding;
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25 import org.simantics.databoard.binding.IntegerBinding;
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26 import org.simantics.databoard.binding.LongBinding;
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27 import org.simantics.databoard.binding.MapBinding;
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28 import org.simantics.databoard.binding.OptionalBinding;
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29 import org.simantics.databoard.binding.RecordBinding;
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30 import org.simantics.databoard.binding.StringBinding;
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31 import org.simantics.databoard.binding.UnionBinding;
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32 import org.simantics.databoard.binding.VariantBinding;
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33 import org.simantics.databoard.binding.error.BindingException;
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34 import org.simantics.databoard.binding.error.RuntimeBindingException;
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35 import org.simantics.databoard.type.ArrayType;
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36 import org.simantics.databoard.type.ByteType;
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37 import org.simantics.databoard.type.DoubleType;
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38 import org.simantics.databoard.type.FloatType;
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39 import org.simantics.databoard.type.IntegerType;
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40 import org.simantics.databoard.type.LongType;
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41 import org.simantics.databoard.type.StringType;
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42 import org.simantics.databoard.util.Range;
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45 * Visitor that creates a default instance of a DataType.
46 * This visitor may throw RuntimeBindingException.
49 * ------------------------------------------------------
51 * Byte, Integer, Long 0 or min limit
52 * Float, Double 0.0 or min limit
56 * Record each field with default value
57 * Array min range number of elements
62 * TODO Create String according to the pattern
63 * @author Toni Kalajainen <toni.kalajainen@vtt.fi>
65 public class DefaultValue implements Visitor<Object> {
67 /** Map of default values already created. Used to link back to recursive records */
68 Map<Binding, Object> map = new WeakHashMap<Binding, Object>(1);
71 public Object visit(ArrayBinding b) {
74 ArrayType at = b.type();
75 Range r = at.getLength();
76 int min = (r!=null) ? r.getLower().getValue().intValue() : 0;
79 Binding componentBinding = b.getComponentBinding();
80 Object[] array = new Object[min];
81 for (int i=0; i<min; i++) {
82 array[i] = componentBinding.accept(this);
84 result = b.createUnchecked(array);
86 result = b.createUnchecked();
92 public Object visit(BooleanBinding b) {
93 Object result = b.createUnchecked(Boolean.FALSE);
98 public Object visit(DoubleBinding b) {
99 DoubleType type = b.type();
100 Range range = type.getRange();
101 Number lowValue = range==null ? null : range.getLower().getValue();
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102 return b.createUnchecked( lowValue == null ? 0 : lowValue.doubleValue() );
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106 public Object visit(FloatBinding b) {
107 FloatType type = b.type();
108 Range range = type.getRange();
109 Number lowValue = range==null ? null : range.getLower().getValue();
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110 return b.createUnchecked( lowValue == null ? 0 : lowValue.floatValue() );
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114 public Object visit(IntegerBinding b) {
115 IntegerType type = b.type();
116 Range range = type.getRange();
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117 Number lowValue = range==null ? null : range.getLower().getValue();
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118 return b.createUnchecked( lowValue == null ? 0 : lowValue.intValue() );
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122 public Object visit(ByteBinding b) {
123 ByteType type = b.type();
124 Range range = type.getRange();
125 Number lowValue = range==null ? null : range.getLower().getValue();
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126 return b.createUnchecked( lowValue == null ? 0 : lowValue.intValue() );
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130 public Object visit(LongBinding b) {
131 LongType type = b.type();
132 Range range = type.getRange();
133 Number lowValue = range==null ? null : range.getLower().getValue();
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134 return b.createUnchecked( lowValue == null ? 0 : lowValue.longValue() );
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138 public Object visit(OptionalBinding b) {
139 return b.createNoValueUnchecked();
143 public Object visit(RecordBinding b) {
145 Object result = null;
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146 if (b.type().isReferable()) {
148 if (result!=null) return result;
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150 Object[] values = new Object[ b.getComponentCount() ];
151 result = b.createPartial();
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152 if (b.type().isReferable()) map.put(b, result);
153 for (int i=0; i<values.length; i++) {
154 Binding cb = b.getComponentBinding(i);
155 values[i] = cb.accept(this);
157 b.setComponents(result, values);
159 } catch (BindingException e) {
160 throw new RuntimeBindingException(e);
165 public Object visit(StringBinding b) {
166 Object result = null;
167 StringType st = b.type();
168 if (st.getPattern() != null) {
169 // TODO Create a string that is valid to the pattern
170 result = b.createUnchecked("");
172 result = b.createUnchecked("");
178 public Object visit(UnionBinding b) {
180 Binding componentBinding = b.getComponentBinding(tag);
181 Object tag0defaultValue = componentBinding.accept(this);
182 return b.createUnchecked(tag, tag0defaultValue);
187 public Object visit(VariantBinding b) {
188 Binding voidBinding = Bindings.getBindingUnchecked(void.class);
189 Object voidValue = null;
190 return b.createUnchecked(voidBinding, voidValue);
194 public Object visit(MapBinding b) {
195 return b.createUnchecked();