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annotate org.eclipse.text/src/org/eclipse/jface/text/templates/TemplateContextType.d @ 14:5feec68b4556

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First run of automatic package imports
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:41:58 +0100
parents bc29606a740c
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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.jface.text.templates.TemplateContextType;
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14 import org.eclipse.jface.text.templates.TemplateVariable;
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15 import org.eclipse.jface.text.templates.TemplateTranslator;
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16 import org.eclipse.jface.text.templates.SimpleTemplateVariableResolver;
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17 import org.eclipse.jface.text.templates.TemplateException;
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18 import org.eclipse.jface.text.templates.TemplateBuffer;
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19 import org.eclipse.jface.text.templates.DocumentTemplateContext;
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20 import org.eclipse.jface.text.templates.GlobalTemplateVariables;
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21 import org.eclipse.jface.text.templates.Template;
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22 import org.eclipse.jface.text.templates.TextTemplateMessages;
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23 import org.eclipse.jface.text.templates.TemplateVariableType;
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24 import org.eclipse.jface.text.templates.TemplateContext;
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25 import org.eclipse.jface.text.templates.TemplateVariableResolver;
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29 import java.lang.all;
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30 import java.util.Collections;
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31 import java.util.List;
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32 import java.util.ArrayList;
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33 import java.util.Iterator;
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34 import java.util.Map;
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35 import java.util.HashMap;
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36 import java.util.Set;
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43
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44 import org.eclipse.core.runtime.Assert;
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45 import org.eclipse.jface.text.BadLocationException;
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46 import org.eclipse.jface.text.Document;
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47 import org.eclipse.jface.text.IDocument;
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48 import org.eclipse.text.edits.MalformedTreeException;
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49 import org.eclipse.text.edits.MultiTextEdit;
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50 import org.eclipse.text.edits.RangeMarker;
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51 import org.eclipse.text.edits.ReplaceEdit;
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52 import org.eclipse.text.edits.TextEdit;
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54
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55 /**
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56 * A context type defines a context within which templates are resolved. It
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57 * stores a number of <code>TemplateVariableResolver</code>s. A
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58 * <code>TemplateBuffer</code> can be resolved in a
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59 * <code>TemplateContext</code> using the
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60 * {@link #resolve(TemplateBuffer, TemplateContext)} method.
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61 * <p>
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62 * Clients may extend this class.
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63 * </p>
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64 *
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65 * @since 3.0
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66 */
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67 public class TemplateContextType {
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68
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69 /** The id of the context type. */
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70 private /* final */ String fId= null;
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71
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72 /** Variable resolvers used by this content type. */
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73 private const Map fResolvers;
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74
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75 /** The name of the context type. */
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76 private String fName= null;
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77
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78 /**
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79 * Creates a context type with an identifier. The identifier must be unique,
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80 * a qualified name is suggested. The id is also used as name.
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81 *
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82 * @param id the unique identifier of the context type
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83 */
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84 public this(String id) {
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85 this(id, id);
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86 }
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87
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88 /**
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89 * Creates a context type with an identifier. The identifier must be unique, a qualified name is suggested.
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90 *
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91 * @param id the unique identifier of the context type
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92 * @param name the name of the context type
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93 */
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94 public this(String id, String name) {
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95 fResolvers= new HashMap();
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96
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97 Assert.isNotNull(id);
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98 Assert.isNotNull(name);
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99 fId= id;
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100 fName= name;
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101 }
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102
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103 /**
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104 * Returns the id of the context type.
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105 *
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106 * @return the id of the receiver
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107 */
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108 public String getId() {
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109 return fId;
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110 }
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111
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112
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113 /**
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114 * Returns the name of the context type.
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115 *
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116 * @return the name of the context type
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117 */
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118 public String getName() {
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119 return fName;
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120 }
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121
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122 /**
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123 * Creates a context type with a <code>null</code> identifier.
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124 * <p>
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125 * This is a framework-only constructor that exists only so that context
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126 * types can be contributed via an extension point and that should not be
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127 * called in client code except for subclass constructors; use
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128 * {@link #TemplateContextType(String)} instead.
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129 * </p>
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130 */
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131 public this() {
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132 fResolvers= new HashMap();
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133 }
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134
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135 /**
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136 * Sets the id of this context.
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137 * <p>
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138 * This is a framework-only method that exists solely so that context types
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139 * can be contributed via an extension point and that should not be called
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140 * in client code; use {@link #TemplateContextType(String)} instead.
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141 * </p>
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142 *
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143 * @param id the identifier of this context
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144 * @throws RuntimeException an unspecified exception if the id has already
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145 * been set on this context type
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146 */
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147 public final void setId(String id) {
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148 Assert.isNotNull(id);
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149 Assert.isTrue(fId is null); // may only be called once when the context is instantiated
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150 fId= id;
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151 }
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152
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153 /**
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154 * Sets the name of the context type.
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155 *
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156 * <p>
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157 * This is a framework-only method that exists solely so that context types
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158 * can be contributed via an extension point and that should not be called
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159 * in client code; use {@link #TemplateContextType(String, String)} instead.
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160 * </p>
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161 *
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162 * @param name the name of the context type
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163 */
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164 public final void setName(String name) {
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165 Assert.isTrue(fName is null); // only initialized by extension code
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166 fName= name;
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167 }
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168
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169 /**
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170 * Adds a variable resolver to the context type. If there already is a resolver
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171 * for the same type, the previous one gets replaced by <code>resolver</code>.
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172 *
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173 * @param resolver the resolver to be added under its name
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174 */
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175 public void addResolver(TemplateVariableResolver resolver) {
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176 Assert.isNotNull(resolver);
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177 fResolvers.put(resolver.getType(), resolver);
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178 }
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179
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180 /**
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181 * Removes a template variable from the context type.
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182 *
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183 * @param resolver the variable to be removed
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184 */
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185 public void removeResolver(TemplateVariableResolver resolver) {
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186 Assert.isNotNull(resolver);
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187 fResolvers.remove(resolver.getType());
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188 }
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189
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190 /**
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191 * Removes all template variables from the context type.
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192 */
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193 public void removeAllResolvers() {
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194 fResolvers.clear();
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195 }
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196
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197 /**
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198 * Returns an iterator for the variables known to the context type.
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199 *
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200 * @return an iterator over the variables in this context type
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201 */
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202 public Iterator resolvers() {
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203 return Collections.unmodifiableMap(fResolvers).values().iterator();
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204 }
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205
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206 /**
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207 * Returns the resolver for the given type.
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208 *
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209 * @param type the type for which a resolver is needed
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210 * @return a resolver for the given type, or <code>null</code> if none is registered
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211 */
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212 protected TemplateVariableResolver getResolver(String type) {
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213 return cast(TemplateVariableResolver) fResolvers.get(type);
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214 }
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215
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216 /**
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217 * Validates a pattern, a <code>TemplateException</code> is thrown if
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218 * validation fails.
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219 *
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220 * @param pattern the template pattern to validate
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221 * @throws TemplateException if the pattern is invalid
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222 */
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223 public void validate(String pattern) {
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224 TemplateTranslator translator= new TemplateTranslator();
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225 TemplateBuffer buffer= translator.translate(pattern);
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226 validateVariables(buffer.getVariables());
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227 }
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228
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229 /**
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230 * Validates the variables in this context type. If a variable is not valid,
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231 * e.g. if its type is not known in this context type, a
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232 * <code>TemplateException</code> is thrown.
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233 * <p>
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234 * The default implementation does nothing.
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235 * </p>
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236 *
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237 * @param variables the variables to validate
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238 * @throws TemplateException if one of the variables is not valid in this
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239 * context type
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240 */
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241 protected void validateVariables(TemplateVariable[] variables) {
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242 }
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243
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244 /**
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245 * Resolves the variables in <code>buffer</code> within <code>context</code>
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246 * and edits the template buffer to reflect the resolved variables.
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247 *
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248 * @param buffer the template buffer
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249 * @param context the template context
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250 * @throws MalformedTreeException if the positions in the buffer overlap
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251 * @throws BadLocationException if the buffer cannot be successfully modified
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252 */
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253 public void resolve(TemplateBuffer buffer, TemplateContext context) {
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254 Assert.isNotNull(context);
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255 TemplateVariable[] variables= buffer.getVariables();
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256
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257 List positions= variablesToPositions(variables);
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258 List edits= new ArrayList(5);
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259
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260 // iterate over all variables and try to resolve them
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261 for (int i= 0; i !is variables.length; i++) {
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262 TemplateVariable variable= variables[i];
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263
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264 if (!variable.isResolved())
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265 resolve(variable, context);
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266
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267 String value= variable.getDefaultValue();
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268 int[] offsets= variable.getOffsets();
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269 // update buffer to reflect new value
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270 for (int k= 0; k !is offsets.length; k++)
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271 edits.add(new ReplaceEdit(offsets[k], variable.getInitialLength(), value));
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272
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273 }
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274
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275 IDocument document= new Document(buffer.getString());
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276 MultiTextEdit edit= new MultiTextEdit(0, document.getLength());
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277 edit.addChildren(arraycast!(TextEdit)( positions.toArray()));
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278 edit.addChildren(arraycast!(TextEdit)( edits.toArray()));
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279 edit.apply(document, TextEdit.UPDATE_REGIONS);
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280
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281 positionsToVariables(positions, variables);
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282
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283 buffer.setContent(document.get(), variables);
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284 }
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285
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286 /**
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287 * Resolves a single variable in a context. Resolving is delegated to the registered resolver.
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288 *
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289 * @param variable the variable to resolve
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290 * @param context the context in which to resolve the variable
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291 * @since 3.3
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292 */
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293 public void resolve(TemplateVariable variable, TemplateContext context) {
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294 String type= variable.getType();
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295 TemplateVariableResolver resolver= cast(TemplateVariableResolver) fResolvers.get(type);
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296 if (resolver is null)
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297 resolver= new TemplateVariableResolver(type, ""); //$NON-NLS-1$
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298 resolver.resolve(variable, context);
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299 }
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300
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301 private static List variablesToPositions(TemplateVariable[] variables) {
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302 List positions= new ArrayList(5);
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303 for (int i= 0; i !is variables.length; i++) {
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304 int[] offsets= variables[i].getOffsets();
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305 for (int j= 0; j !is offsets.length; j++)
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306 positions.add(new RangeMarker(offsets[j], 0));
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307 }
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308
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309 return positions;
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310 }
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311
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312 private static void positionsToVariables(List positions, TemplateVariable[] variables) {
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313 Iterator iterator= positions.iterator();
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314
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315 for (int i= 0; i !is variables.length; i++) {
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316 TemplateVariable variable= variables[i];
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317
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318 int[] offsets= new int[variable.getOffsets().length];
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319 for (int j= 0; j !is offsets.length; j++)
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320 offsets[j]= (cast(TextEdit) iterator.next()).getOffset();
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321
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322 variable.setOffsets(offsets);
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323 }
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324 }
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325 }