Mercurial > hg > Members > kono > jpf-core

annotate src/main/gov/nasa/jpf/vm/choice/NumberChoiceFromList.java @ 0:61d41facf527

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author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18 package gov.nasa.jpf.vm.choice;
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19
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20 import gov.nasa.jpf.Config;
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21 import gov.nasa.jpf.JPFException;
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22 import gov.nasa.jpf.vm.ChoiceGeneratorBase;
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23 import gov.nasa.jpf.vm.StackFrame;
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24 import gov.nasa.jpf.vm.ThreadInfo;
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25
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26 import java.util.Arrays;
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27 import java.util.Comparator;
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28
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29 /**
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30 * common root for list based number choice generators
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31 */
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32 public abstract class NumberChoiceFromList<T extends Number> extends ChoiceGeneratorBase<T> {
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33
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34 // int values to choose from stored as Strings or Integers
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35 protected T[] values;
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36 protected int count = -1;
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37
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38 /**
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39 * super constructor for subclasses that want to configure themselves
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40 * @param id name used in choice config
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41 */
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42 protected NumberChoiceFromList(String id){
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43 super(id);
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44 }
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45
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46 protected NumberChoiceFromList (String id, T[] vals){
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47 super(id);
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48 values = vals;
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49 count = -1;
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50 }
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51
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52 protected abstract T[] createValueArray(int len);
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53 protected abstract T getDefaultValue();
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54 protected abstract T parseLiteral (String literal, int sign);
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55 protected abstract T newValue (Number num, int sign);
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56
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57 /**
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58 * @param conf JPF configuration object
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59 * @param id name used in choice config
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60 */
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61 public NumberChoiceFromList(Config conf, String id) {
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62 super(id);
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63
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64 String[] vals = conf.getCompactStringArray(id + ".values");
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65 if (vals == null || vals.length == 0) {
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66 throw new JPFException("no value specs for IntChoiceFromList " + id);
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67 }
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68
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69 // get the choice values here because otherwise successive getNextChoice()
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70 // calls within the same transition could see different values when looking
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71 // up fields and locals
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72 values = createValueArray(vals.length);
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73 StackFrame resolveFrame = ThreadInfo.getCurrentThread().getLastNonSyntheticStackFrame();
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74 for (int i=0; i<vals.length; i++){
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75 values[i] = parse(vals[i], resolveFrame);
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76 }
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77 }
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78
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79
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80 @Override
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81 public void reset () {
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82 count = -1;
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83
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84 isDone = false;
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85 }
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86
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87 /**
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88 * @see gov.nasa.jpf.vm.IntChoiceGenerator#getNextChoice()
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89 **/
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90 @Override
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91 public T getNextChoice() {
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92
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93 if ((count >= 0) && (count < values.length)) {
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94 return values[count];
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95 }
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96
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97 return getDefaultValue();
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98 }
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99
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100 /**
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101 * @see gov.nasa.jpf.vm.ChoiceGenerator#hasMoreChoices()
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102 **/
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103 @Override
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104 public boolean hasMoreChoices() {
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105 if (!isDone && (count < values.length-1))
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106 return true;
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107 else
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108 return false;
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109 }
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110
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111 /**
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112 * @see gov.nasa.jpf.vm.ChoiceGenerator#advance()
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113 **/
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114 @Override
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115 public void advance() {
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116 if (count < values.length-1) count++;
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117 }
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118
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119 /**
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120 * get String label of current value, as specified in config file
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121 **/
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122 public String getValueLabel(){
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123 return values[count].toString();
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124 }
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125
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126 @Override
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127 public int getTotalNumberOfChoices () {
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128 return values.length;
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129 }
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130
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131 @Override
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132 public int getProcessedNumberOfChoices () {
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133 return count+1;
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134 }
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135
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136 @Override
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137 public boolean supportsReordering(){
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138 return true;
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139 }
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140
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141
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142 protected T parse (String varSpec, StackFrame resolveFrame){
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143 int sign = 1;
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144
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145 char c = varSpec.charAt(0);
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146 if (c == '+'){
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147 varSpec = varSpec.substring(1);
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148 } else if (c == '-'){
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parents:
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149 sign = -1;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
150 varSpec = varSpec.substring(1);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
151 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
152
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parents:
diff changeset
153 if (varSpec.isEmpty()){
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parents:
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154 throw new JPFException("illegal value spec for IntChoiceFromList " + id);
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parents:
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155 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
156
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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157 c = varSpec.charAt(0);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
158 if (Character.isDigit(c)){ // its an integer literal
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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159 return parseLiteral(varSpec, sign);
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parents:
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160
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
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161 } else { // a variable or field name
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parents:
diff changeset
162 Object o = resolveFrame.getLocalOrFieldValue(varSpec);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
163 if (o == null){
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parents:
diff changeset
164 throw new JPFException("no local or field '" + varSpec + "' value found for NumberChoiceFromList " + id);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
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165 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
166 if (o instanceof Number){
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
167 return newValue( (Number)o, sign);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
168 } else {
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parents:
diff changeset
169 throw new JPFException("non-numeric local or field '" + varSpec + "' value for NumberChoiceFromList " + id);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
170 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
171 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
172 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
173
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
174
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
175 @Override
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
176 public NumberChoiceFromList<T> reorder (Comparator<T> comparator){
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parents:
diff changeset
177
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
178 T[] newValues = values.clone();
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parents:
diff changeset
179 Arrays.sort( newValues, comparator);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
180
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
181 // we can't instantiate directly
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
182 try {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
183 NumberChoiceFromList<T> clone = (NumberChoiceFromList<T>)clone();
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
184 clone.values = newValues;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
185 clone.count = -1;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
186 return clone;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
187
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
188 } catch (CloneNotSupportedException cnsx){
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
189 // can't happen
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
190 throw new JPFException("can't clone NumberChoiceFromList " + this);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
191 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
192 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
193
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
194 @Override
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
195 public String toString() {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
196 StringBuilder sb = new StringBuilder(getClass().getName());
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
197 sb.append("[id=\"");
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
198 sb.append(id);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
199 sb.append('"');
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
200
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
201 sb.append(",isCascaded:");
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
202 sb.append(isCascaded);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
203
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
204 sb.append(",");
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
205 for (int i=0; i<values.length; i++) {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
206 if (i > 0) {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
207 sb.append(',');
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
208 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
209 if (i == count) {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
210 sb.append(MARKER);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
211 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
212 sb.append(values[i]);
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
213 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
214 sb.append(']');
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
215 return sb.toString();
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
216 }
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
217
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
218
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
219 @Override
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
220 public NumberChoiceFromList<T> randomize () {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
221 for (int i = values.length - 1; i > 0; i--) {
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
222 int j = random.nextInt(i + 1);
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
223 T tmp = values[i];
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
224 values[i] = values[j];
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
225 values[j] = tmp;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
226 }
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
227 return this;
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Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
228 }
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
229
61d41facf527 initial v8 import (history reset)
Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
parents:
diff changeset
230 }