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annotate org.eclipse.core.commands/src/org/eclipse/core/commands/ParameterType.d @ 17:6f068362a363

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Remove direct import of tango.text.convert.Format
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 09:09:23 +0100
parents bc29606a740c
children 634e4380db78
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1 /*******************************************************************************
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2 * Copyright (c) 2005, 2006 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 module org.eclipse.core.commands.ParameterType;
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14
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15 import org.eclipse.core.commands.common.HandleObject;
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16 import org.eclipse.core.commands.common.NotDefinedException;
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17 import org.eclipse.core.internal.commands.util.Util;
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18 import org.eclipse.core.commands.AbstractParameterValueConverter;
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19 import org.eclipse.core.commands.IParameterTypeListener;
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20 import org.eclipse.core.commands.ParameterTypeEvent;
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21
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22 import java.lang.all;
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23
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24 /**
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25 * <p>
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26 * Provides information about the type of a command parameter. Clients can use a
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27 * parameter type to check if an object matches the type of the parameter with
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28 * {@link #isCompatible(Object)} and can get an
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29 * {@link AbstractParameterValueConverter} to convert between objects matching
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30 * the parameter type and strings that encode the object's identity.
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31 * </p>
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32 * <p>
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33 * A command parameter is not required to declare a type. To determine if a
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34 * given parameter has a type, check if an {@link IParameter} implements
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35 * {@link ITypedParameter} and if so, use
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36 * {@link ITypedParameter#getParameterType()} like this:
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37 * </p>
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38 *
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39 * <pre>
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40 * IParameter parameter = // ... get IParameter from Command
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41 * if (parameter instanceof ITypedParameter) {
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42 * ParameterType type = ((ITypedParameter)parameter).getParameterType();
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43 * if (type !is null) {
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44 * // this parameter has a ParameterType
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45 * }
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46 * }
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47 * </pre>
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48 *
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49 * @see IParameter
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50 * @see ITypedParameter#getParameterType()
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51 * @since 3.2
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52 */
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53 public final class ParameterType : HandleObject, Comparable {
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54
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55 /**
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56 * TODO: this was copied from
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57 * org.eclipse.core.internal.expressions.Expressions is there a better place
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58 * to reference this?
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59 *
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60 * @param element
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61 * The element to test; may be <code>null</code>.
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62 * @param type
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63 * The type against which we are testing;may be <code>null</code>.
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64 * @return <code>true</code> if the <code>element</code> is an instance
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65 * of <code>type</code>; <code>false</code> otherwise.
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66 */
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67 private static final bool isInstanceOf(Object element,
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68 String type) {
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69 // null isn't an instanceof of anything.
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70 if (element is null) {
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71 return false;
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72 }
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73 return isSubtype(element.classinfo, type);
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74 }
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75
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76 /**
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77 * TODO: this was copied from
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78 * org.eclipse.core.internal.expressions.Expressions is there a better place
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79 * to reference this?
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80 *
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81 * @param clazz
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82 * The class to match; may be <code>null</code>.
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83 * @param type
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84 * The type against which we are testing;may be <code>null</code>.
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85 * @return <code>true</code> if the <code>element</code> is an instance
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86 * of <code>type</code>; <code>false</code> otherwise.
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87 */
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88 private static final bool isSubtype(ClassInfo clazz, String type) {
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89 if (clazz.name.equals(type)) {
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90 return true;
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91 }
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92 ClassInfo superClass = clazz.base;
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93 if (superClass !is null && isSubtype(superClass, type)) {
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94 return true;
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95 }
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96 Interface[] interfaces = clazz.interfaces;
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97 for (int i = 0; i < interfaces.length; i++) {
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98 if (isSubtype(interfaces[i].classinfo, type)) {
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99 return true;
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100 }
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101 }
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102 return false;
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103 }
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104
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105 /**
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106 * An {@link AbstractParameterValueConverter} for converting parameter
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107 * values between objects and strings. This may be <code>null</code>.
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108 */
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109 private /+transient+/ AbstractParameterValueConverter parameterTypeConverter;
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110
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111 /**
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112 * A string specifying the object type of this parameter type. This will be
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113 * <code>null</code> when the parameter type is undefined but never null
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114 * when it is defined.
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115 */
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116 private /+transient+/ String type = null;
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117
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118 /**
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119 * Constructs a new instance based on the given identifier. When a parameter
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120 * type is first constructed, it is undefined. Parameter types should only
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121 * be constructed by the {@link CommandManager} to ensure that the
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122 * identifier remains unique.
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123 *
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124 * @param id
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125 * The identifier for this type. This value must not be
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126 * <code>null</code>, and must be unique amongst all parameter
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127 * types.
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128 */
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129 this(String id) {
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130 super(id);
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131 }
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132
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133 /**
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134 * Adds a listener to this parameter type that will be notified when its
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135 * state changes.
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136 *
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137 * @param listener
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138 * The listener to be added; must not be <code>null</code>.
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139 */
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140 public final void addListener(IParameterTypeListener listener) {
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141 addListenerObject(cast(Object)listener);
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142 }
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143
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144 /**
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145 * Compares this parameter type with another object by comparing each of the
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146 * non-transient attributes.
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147 *
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148 * @param object
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149 * The object with which to compare; must be an instance of
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150 * {@link ParameterType}.
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151 * @return A negative integer, zero or a positive integer, if the object is
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152 * greater than, equal to or less than this parameter type.
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153 */
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154 public final int compareTo(Object object) {
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155 ParameterType castedObject = cast(ParameterType) object;
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156 int compareTo = Util.compare(defined, castedObject.defined);
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157 if (compareTo is 0) {
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158 compareTo = Util.compare(id, castedObject.id);
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159 }
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160 return compareTo;
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161 }
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162
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163 /**
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164 * <p>
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165 * Defines this parameter type, setting the defined property to
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166 * <code>true</code>.
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167 * </p>
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168 * <p>
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169 * Notification is sent to all listeners that something has changed.
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170 * </p>
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171 *
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172 * @param type
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173 * a string identifying the Java object type for this parameter
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174 * type; <code>null</code> is interpreted as
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175 * <code>"java.lang.Object"</code>
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176 * @param parameterTypeConverter
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177 * an {@link AbstractParameterValueConverter} to perform
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178 * string/object conversions for parameter values; may be
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179 * <code>null</code>
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180 */
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181 public final void define(String type,
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182 AbstractParameterValueConverter parameterTypeConverter) {
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183
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184 bool definedChanged = !this.defined;
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185 this.defined = true;
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186
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187 this.type = (type is null) ? Object.classinfo.name : type;
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188 this.parameterTypeConverter = parameterTypeConverter;
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189
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190 fireParameterTypeChanged(new ParameterTypeEvent(this, definedChanged));
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191 }
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192
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193 /**
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194 * Notifies all listeners that this parameter type has changed. This sends
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195 * the given event to all of the listeners, if any.
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196 *
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197 * @param event
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198 * The event to send to the listeners; must not be
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199 * <code>null</code>.
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200 */
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201 private final void fireParameterTypeChanged(ParameterTypeEvent event) {
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202 if (event is null) {
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203 throw new NullPointerException(
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204 "Cannot send a null event to listeners."); //$NON-NLS-1$
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205 }
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206
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207 if (!isListenerAttached()) {
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208 return;
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209 }
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210
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211 Object[] listeners = getListeners();
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212 for (int i = 0; i < listeners.length; i++) {
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213 IParameterTypeListener listener = cast(IParameterTypeListener) listeners[i];
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214 listener.parameterTypeChanged(event);
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215 }
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216 }
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217
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218 /**
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219 * Returns the value converter associated with this parameter, if any.
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220 *
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221 * @return The parameter value converter, or <code>null</code> if there is
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222 * no value converter for this parameter.
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223 * @throws NotDefinedException
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224 * if the parameter type is not currently defined
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225 */
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226 public final AbstractParameterValueConverter getValueConverter() {
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227 if (!isDefined()) {
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228 throw new NotDefinedException(
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229 "Cannot use getValueConverter() with an undefined ParameterType"); //$NON-NLS-1$
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230 }
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231
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232 return parameterTypeConverter;
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233 }
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234
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235 /**
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236 * Returns whether the provided value is compatible with this parameter
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237 * type. An object is compatible with a parameter type if the object is an
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238 * instance of the class defined as the parameter's type class.
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239 *
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240 * @param value
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241 * an object to check for compatibility with this parameter type;
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242 * may be <code>null</code>.
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243 * @return <code>true</code> if the value is compatible with this type,
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244 * <code>false</code> otherwise
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245 * @throws NotDefinedException
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246 * if the parameter type is not currently defined
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247 */
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248 public bool isCompatible(Object value) {
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249 if (!isDefined()) {
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250 throw new NotDefinedException(
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251 "Cannot use isCompatible() with an undefined ParameterType"); //$NON-NLS-1$
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252 }
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253 return isInstanceOf(value, type);
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254 }
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255
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256 /**
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257 * Unregisters listener for changes to properties of this parameter type.
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258 *
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259 * @param listener
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260 * the instance to unregister. Must not be <code>null</code>.
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261 * If an attempt is made to unregister an instance which is not
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262 * already registered with this instance, no operation is
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263 * performed.
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264 */
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265 public final void removeListener(IParameterTypeListener listener) {
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266 removeListenerObject(cast(Object)listener);
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267 }
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268
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269 /**
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270 * The string representation of this parameter type. For debugging purposes
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271 * only. This string should not be shown to an end user.
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272 *
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273 * @return The string representation; never <code>null</code>.
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274 */
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275 public override final String toString() {
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276 if (string is null) {
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277 string = Format( "ParameterType({},{})", id, defined );
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278 }
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279 return string;
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280 }
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281
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282 /**
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283 * Makes this parameter type become undefined. Notification is sent to all
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284 * listeners.
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285 */
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286 public override final void undefine() {
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287 string = null;
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288
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289 final bool definedChanged = defined;
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290 defined = false;
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291
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292 type = null;
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293 parameterTypeConverter = null;
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294
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295 fireParameterTypeChanged(new ParameterTypeEvent(this, definedChanged));
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296 }
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297
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298 }