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annotate dwtx/core/commands/Parameterization.d @ 3:6518c18a01f7

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eclipse.core package without osgi dependencies
author Frank Benoit <benoit@tionex.de>
date Wed, 26 Mar 2008 00:57:19 +0100
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children ea8ff534f622
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6518c18a01f7 eclipse.core package without osgi dependencies
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1 /*******************************************************************************
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2 * Copyright (c) 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 ******************************************************************************/
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13
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14 module dwtx.core.commands.Parameterization;
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16 import tango.util.collection.model.Map;
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17
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18 import dwtx.core.commands.IParameter;
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19 import dwtx.core.internal.commands.util.Util;
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20
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21 import dwt.dwthelper.utils;
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22
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23 /**
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24 * <p>
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25 * A parameter with a specific value. This is usually a part of a
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26 * <code>ParameterizedCommand</code>, which is used to refer to a command
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27 * with a collection of parameterizations.
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28 * </p>
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29 *
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30 * @since 3.1
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31 */
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32 public final class Parameterization {
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33
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34 /**
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35 * The constant integer hash code value meaning the hash code has not yet
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36 * been computed.
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37 */
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38 private static const int HASH_CODE_NOT_COMPUTED = -1;
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39
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40 /**
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41 * A factor for computing the hash code for all parameterized commands.
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42 */
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43 private static const int HASH_FACTOR = 89;
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44
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45 /**
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46 * The seed for the hash code for all parameterized commands.
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47 */
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48 private static const int HASH_INITIAL;
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49
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50 static this(){
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51 HASH_INITIAL = dwt.dwthelper.utils.toHash( Parameterization.classinfo.name );
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52 }
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53 /**
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54 * The hash code for this object. This value is computed lazily, and marked
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55 * as invalid when one of the values on which it is based changes.
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56 */
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57 private /+transient+/ hash_t hashCode = HASH_CODE_NOT_COMPUTED;
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58
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59 /**
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60 * The parameter that is being parameterized. This value is never
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61 * <code>null</code>.
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62 */
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63 private const IParameter parameter;
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64
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65 /**
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66 * The value that defines the parameterization. This value may be
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67 * <code>null</code>.
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68 */
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69 private const String value;
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70
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71 /**
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72 * Constructs a new instance of <code>Parameterization</code>.
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73 *
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74 * @param parameter
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75 * The parameter that is being parameterized; must not be
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76 * <code>null</code>.
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77 * @param value
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78 * The value for the parameter; may be <code>null</code>.
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79 */
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80 public this(IParameter parameter, String value) {
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81 if (parameter is null) {
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82 throw new NullPointerException(
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83 "You cannot parameterize a null parameter"); //$NON-NLS-1$
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84 }
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85
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86 this.parameter = parameter;
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87 this.value = value;
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88 }
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89
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90 /* (non-Javadoc)
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91 * @see java.lang.Object#equals(java.lang.Object)
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92 */
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93 public final bool equals(Object object) {
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94 if (this is object) {
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95 return true;
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96 }
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97
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98 if (!(cast(Parameterization)object)) {
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99 return false;
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100 }
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101
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102 Parameterization parameterization = cast(Parameterization) object;
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103 if (!(Util.equals(this.parameter.getId(), parameterization.parameter
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104 .getId()))) {
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105 return false;
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106 }
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107
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108 return Util.equals(this.value, parameterization.value);
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109 }
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110
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111 /**
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112 * Returns the parameter that is being parameterized.
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113 *
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114 * @return The parameter; never <code>null</code>.
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115 */
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116 public final IParameter getParameter() {
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117 return parameter;
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118 }
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119
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120 /**
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121 * Returns the value for the parameter in this parameterization.
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122 *
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123 * @return The value; may be <code>null</code>.
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124 */
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125 public final String getValue() {
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126 return value;
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127 }
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128
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129 /**
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130 * Returns the human-readable name for the current value, if any. If the
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131 * name cannot be found, then it simply returns the value. It also ensures
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132 * that any <code>null</code> values are converted into an empty string.
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133 *
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134 * @return The human-readable name of the value; never <code>null</code>.
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135 * @throws ParameterValuesException
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136 * If the parameter needed to be initialized, but couldn't be.
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137 */
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138 public final String getValueName() {
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139 auto parameterValues = parameter.getValues().getParameterValues();
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140 String returnValue = null;
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141 foreach( k, v; parameterValues ){
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142 if (Util.equals(value, v)) {
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143 returnValue = k;
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144 break;
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145 }
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146 }
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147 if (returnValue is null) {
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148 return Util.ZERO_LENGTH_STRING;
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149 }
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150
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151 return returnValue;
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152 }
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153
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154 /* (non-Javadoc)
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155 * @see java.lang.Object#hashCode()
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156 */
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157 public override final hash_t toHash() {
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158 if (hashCode is HASH_CODE_NOT_COMPUTED) {
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159 hashCode = HASH_INITIAL * HASH_FACTOR + Util.toHash(cast(Object)parameter);
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160 hashCode = hashCode * HASH_FACTOR + Util.toHash(value);
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161 if (hashCode is HASH_CODE_NOT_COMPUTED) {
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162 hashCode++;
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163 }
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164 }
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165 return hashCode;
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166 }
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167 }