1 | /*
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2 | * Copyright 2002-2004 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 |
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18 | package org.apache.tools.ant;
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19 |
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20 | import java.util.Hashtable;
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21 | import java.util.Vector;
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22 | import java.util.Enumeration;
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23 |
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24 |
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25 | /* ISSUES:
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26 | - ns param. It could be used to provide "namespaces" for properties, which
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27 | may be more flexible.
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28 | - Object value. In ant1.5 String is used for Properties - but it would be nice
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29 | to support generic Objects (the property remains immutable - you can't change
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30 | the associated object). This will also allow JSP-EL style setting using the
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31 | Object if an attribute contains only the property (name="${property}" could
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32 | avoid Object->String->Object conversion)
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33 | - Currently we "chain" only for get and set property (probably most users
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34 | will only need that - if they need more they can replace the top helper).
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35 | Need to discuss this and find if we need more.
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36 | */
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37 |
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38 | /** NOT FINAL. API MAY CHANGE
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39 | *
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40 | * Deals with properties - substitution, dynamic properties, etc.
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41 | *
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42 | * This is the same code as in Ant1.5. The main addition is the ability
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43 | * to chain multiple PropertyHelpers and to replace the default.
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44 | *
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45 | * @since Ant 1.6
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46 | */
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47 | public class PropertyHelper {
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48 |
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49 | private Project project;
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50 | private PropertyHelper next;
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51 |
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52 | /** Project properties map (usually String to String). */
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53 | private Hashtable properties = new Hashtable();
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54 |
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55 | /**
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56 | * Map of "user" properties (as created in the Ant task, for example).
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57 | * Note that these key/value pairs are also always put into the
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58 | * project properties, so only the project properties need to be queried.
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59 | * Mapping is String to String.
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60 | */
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61 | private Hashtable userProperties = new Hashtable();
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62 |
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63 | /**
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64 | * Map of inherited "user" properties - that are those "user"
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65 | * properties that have been created by tasks and not been set
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66 | * from the command line or a GUI tool.
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67 | * Mapping is String to String.
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68 | */
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69 | private Hashtable inheritedProperties = new Hashtable();
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70 |
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71 | /**
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72 | * Default constructor.
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73 | */
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74 | protected PropertyHelper() {
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75 | }
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76 |
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77 | // -------------------- Hook management --------------------
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78 |
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79 | /**
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80 | * Set the project for which this helper is performing property resolution
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81 | *
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82 | * @param p the project instance.
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83 | */
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84 | public void setProject(Project p) {
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85 | this.project = p;
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86 | }
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87 |
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88 | /** There are 2 ways to hook into property handling:
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89 | * - you can replace the main PropertyHelper. The replacement is required
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90 | * to support the same semantics (of course :-)
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91 | *
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92 | * - you can chain a property helper capable of storing some properties.
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93 | * Again, you are required to respect the immutability semantics (at
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94 | * least for non-dynamic properties)
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95 | *
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96 | * @param next the next property helper in the chain.
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97 | */
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98 | public void setNext(PropertyHelper next) {
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99 | this.next = next;
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100 | }
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101 |
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102 | /**
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103 | * Get the next property helper in the chain.
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104 | *
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105 | * @return the next property helper.
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106 | */
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107 | public PropertyHelper getNext() {
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108 | return next;
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109 | }
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110 |
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111 | /**
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112 | * Factory method to create a property processor.
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113 | * Users can provide their own or replace it using "ant.PropertyHelper"
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114 | * reference. User tasks can also add themselves to the chain, and provide
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115 | * dynamic properties.
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116 | *
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117 | * @param project the project fro which the property helper is required.
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118 | *
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119 | * @return the project's property helper.
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120 | */
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121 | public static synchronized
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122 | PropertyHelper getPropertyHelper(Project project) {
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123 | PropertyHelper helper
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124 | = (PropertyHelper) project.getReference("ant.PropertyHelper");
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125 | if (helper != null) {
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126 | return helper;
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127 | }
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128 | helper = new PropertyHelper();
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129 | helper.setProject(project);
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130 |
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131 | project.addReference("ant.PropertyHelper", helper);
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132 | return helper;
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133 | }
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134 |
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135 | // -------------------- Methods to override --------------------
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136 |
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137 | /**
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138 | * Sets a property. Any existing property of the same name
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139 | * is overwritten, unless it is a user property. Will be called
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140 | * from setProperty().
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141 | *
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142 | * If all helpers return false, the property will be saved in
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143 | * the default properties table by setProperty.
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144 | *
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145 | * @param ns The namespace that the property is in (currently
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146 | * not used.
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147 | * @param name The name of property to set.
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148 | * Must not be <code>null</code>.
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149 | * @param value The new value of the property.
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150 | * Must not be <code>null</code>.
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151 | * @param inherited True if this property is inherited (an [sub]ant[call] property).
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152 | * @param user True if this property is a user property.
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153 | * @param isNew True is this is a new property.
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154 | * @return true if this helper has stored the property, false if it
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155 | * couldn't. Each helper should delegate to the next one (unless it
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156 | * has a good reason not to).
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157 | */
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158 | public boolean setPropertyHook(String ns, String name,
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159 | Object value,
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160 | boolean inherited, boolean user,
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161 | boolean isNew) {
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162 | if (getNext() != null) {
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163 | boolean subst = getNext().setPropertyHook(ns, name, value,
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164 | inherited, user, isNew);
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165 | // If next has handled the property
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166 | if (subst) {
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167 | return true;
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168 | }
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169 | }
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170 |
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171 | return false;
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172 | }
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173 |
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174 | /** Get a property. If all hooks return null, the default
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175 | * tables will be used.
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176 | *
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177 | * @param ns namespace of the sought property.
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178 | * @param name name of the sought property.
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179 | * @param user True if this is a user property.
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180 | * @return The property, if returned by a hook, or null if none.
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181 | */
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182 | public Object getPropertyHook(String ns, String name, boolean user) {
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183 | if (getNext() != null) {
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184 | Object o = getNext().getPropertyHook(ns, name, user);
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185 | if (o != null) {
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186 | return o;
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187 | }
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188 | }
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189 | // Experimental/Testing, will be removed
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190 | if (name.startsWith("toString:")) {
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191 | name = name.substring("toString:".length());
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192 | Object v = project.getReference(name);
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193 | if (v == null) {
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194 | return null;
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195 | }
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196 | return v.toString();
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197 | }
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198 |
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199 |
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200 | return null;
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201 | }
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202 |
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203 | // -------------------- Optional methods --------------------
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204 | // You can override those methods if you want to optimize or
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205 | // do advanced things (like support a special syntax).
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206 | // The methods do not chain - you should use them when embedding ant
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207 | // (by replacing the main helper)
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208 |
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209 | /**
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210 | * Parses a string containing <code>${xxx}</code> style property
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211 | * references into two lists. The first list is a collection
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212 | * of text fragments, while the other is a set of string property names.
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213 | * <code>null</code> entries in the first list indicate a property
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214 | * reference from the second list.
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215 | *
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216 | * It can be overridden with a more efficient or customized version.
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217 | *
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218 | * @param value Text to parse. Must not be <code>null</code>.
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219 | * @param fragments List to add text fragments to.
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220 | * Must not be <code>null</code>.
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221 | * @param propertyRefs List to add property names to.
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222 | * Must not be <code>null</code>.
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223 | *
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224 | * @exception BuildException if the string contains an opening
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225 | * <code>${</code> without a closing
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226 | * <code>}</code>
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227 | */
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228 | public void parsePropertyString(String value, Vector fragments,
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229 | Vector propertyRefs)
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230 | throws BuildException {
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231 | parsePropertyStringDefault(value, fragments, propertyRefs);
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232 | }
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233 |
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234 | /**
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235 | * Replaces <code>${xxx}</code> style constructions in the given value
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236 | * with the string value of the corresponding data types.
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237 | *
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238 | * @param ns The namespace for the property.
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239 | * @param value The string to be scanned for property references.
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240 | * May be <code>null</code>, in which case this
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241 | * method returns immediately with no effect.
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242 | * @param keys Mapping (String to String) of property names to their
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243 | * values. If <code>null</code>, only project properties will
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244 | * be used.
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245 | *
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246 | * @exception BuildException if the string contains an opening
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247 | * <code>${</code> without a closing
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248 | * <code>}</code>
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249 | * @return the original string with the properties replaced, or
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250 | * <code>null</code> if the original string is <code>null</code>.
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251 | */
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252 | public String replaceProperties(String ns, String value,
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253 | Hashtable keys)
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254 | throws BuildException {
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255 | if (value == null) {
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256 | return null;
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257 | }
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258 |
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259 | Vector fragments = new Vector();
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260 | Vector propertyRefs = new Vector();
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261 | parsePropertyString(value, fragments, propertyRefs);
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262 |
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263 | StringBuffer sb = new StringBuffer();
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264 | Enumeration i = fragments.elements();
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265 | Enumeration j = propertyRefs.elements();
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266 |
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267 | while (i.hasMoreElements()) {
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268 | String fragment = (String) i.nextElement();
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269 | if (fragment == null) {
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270 | String propertyName = (String) j.nextElement();
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271 | Object replacement = null;
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272 |
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273 | // try to get it from the project or keys
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274 | // Backward compatibility
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275 | if (keys != null) {
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276 | replacement = keys.get(propertyName);
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277 | }
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278 | if (replacement == null) {
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279 | replacement = getProperty(ns, propertyName);
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280 | }
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281 |
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282 | if (replacement == null) {
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283 | project.log("Property ${" + propertyName
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284 | + "} has not been set", Project.MSG_VERBOSE);
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285 | }
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286 | fragment = (replacement != null)
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287 | ? replacement.toString()
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288 | : "${" + propertyName + "}";
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289 | }
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290 | sb.append(fragment);
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291 | }
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292 |
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293 | return sb.toString();
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294 | }
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295 |
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296 | // -------------------- Default implementation --------------------
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297 | // Methods used to support the default behavior and provide backward
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298 | // compatibility. Some will be deprecated, you should avoid calling them.
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299 |
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300 |
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301 | /** Default implementation of setProperty. Will be called from Project.
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302 | * This is the original 1.5 implementation, with calls to the hook
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303 | * added.
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304 | * @param ns The namespace for the property (currently not used).
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305 | * @param name The name of the property.
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306 | * @param value The value to set the property to.
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307 | * @param verbose If this is true output extra log messages.
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308 | * @return true if the property is set.
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309 | */
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310 | public synchronized boolean setProperty(String ns, String name,
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311 | Object value, boolean verbose) {
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312 | // user (CLI) properties take precedence
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313 | if (null != userProperties.get(name)) {
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314 | if (verbose) {
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315 | project.log("Override ignored for user property " + name,
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316 | Project.MSG_VERBOSE);
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317 | }
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318 | return false;
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319 | }
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320 |
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321 | boolean done = setPropertyHook(ns, name, value, false, false, false);
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322 | if (done) {
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323 | return true;
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324 | }
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325 |
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326 | if (null != properties.get(name) && verbose) {
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327 | project.log("Overriding previous definition of property " + name,
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328 | Project.MSG_VERBOSE);
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329 | }
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330 |
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331 | if (verbose) {
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332 | project.log("Setting project property: " + name + " -> "
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333 | + value, Project.MSG_DEBUG);
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334 | }
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335 | properties.put(name, value);
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336 | return true;
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337 | }
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338 |
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339 | /**
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340 | * Sets a property if no value currently exists. If the property
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341 | * exists already, a message is logged and the method returns with
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342 | * no other effect.
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343 | *
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344 | * @param ns The namespace for the property (currently not used).
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345 | * @param name The name of property to set.
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346 | * Must not be <code>null</code>.
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347 | * @param value The new value of the property.
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348 | * Must not be <code>null</code>.
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349 | * @since Ant 1.6
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350 | */
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351 | public synchronized void setNewProperty(String ns, String name,
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352 | Object value) {
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353 | if (null != properties.get(name)) {
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354 | project.log("Override ignored for property " + name,
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355 | Project.MSG_VERBOSE);
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356 | return;
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357 | }
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358 |
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359 | boolean done = setPropertyHook(ns, name, value, false, false, true);
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360 | if (done) {
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361 | return;
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362 | }
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363 |
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364 | project.log("Setting project property: " + name + " -> "
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365 | + value, Project.MSG_DEBUG);
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366 | if (name != null && value != null) {
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367 | properties.put(name, value);
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368 | }
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369 | }
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370 |
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371 | /**
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372 | * Sets a user property, which cannot be overwritten by
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373 | * set/unset property calls. Any previous value is overwritten.
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374 | * @param ns The namespace for the property (currently not used).
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375 | * @param name The name of property to set.
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376 | * Must not be <code>null</code>.
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377 | * @param value The new value of the property.
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378 | * Must not be <code>null</code>.
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379 | */
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380 | public synchronized void setUserProperty(String ns, String name,
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381 | Object value) {
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382 | project.log("Setting ro project property: " + name + " -> "
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383 | + value, Project.MSG_DEBUG);
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384 | userProperties.put(name, value);
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385 |
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386 | boolean done = setPropertyHook(ns, name, value, false, true, false);
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387 | if (done) {
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388 | return;
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389 | }
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390 | properties.put(name, value);
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391 | }
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392 |
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393 | /**
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394 | * Sets an inherited user property, which cannot be overwritten by set/unset
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395 | * property calls. Any previous value is overwritten. Also marks
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396 | * these properties as properties that have not come from the
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397 | * command line.
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398 | *
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399 | * @param ns The namespace for the property (currently not used).
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400 | * @param name The name of property to set.
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401 | * Must not be <code>null</code>.
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402 | * @param value The new value of the property.
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403 | * Must not be <code>null</code>.
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404 | */
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405 | public synchronized void setInheritedProperty(String ns, String name,
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406 | Object value) {
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407 | inheritedProperties.put(name, value);
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408 |
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409 | project.log("Setting ro project property: " + name + " -> "
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410 | + value, Project.MSG_DEBUG);
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411 | userProperties.put(name, value);
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412 |
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413 | boolean done = setPropertyHook(ns, name, value, true, false, false);
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414 | if (done) {
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415 | return;
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416 | }
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417 | properties.put(name, value);
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418 | }
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419 |
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420 | // -------------------- Getting properties --------------------
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421 |
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422 | /**
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423 | * Returns the value of a property, if it is set. You can override
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424 | * this method in order to plug your own storage.
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425 | *
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426 | * @param ns The namespace for the property (currently not used).
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427 | * @param name The name of the property.
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428 | * May be <code>null</code>, in which case
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429 | * the return value is also <code>null</code>.
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430 | * @return the property value, or <code>null</code> for no match
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431 | * or if a <code>null</code> name is provided.
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432 | */
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433 | public synchronized Object getProperty(String ns, String name) {
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434 | if (name == null) {
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435 | return null;
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436 | }
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437 |
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438 | Object o = getPropertyHook(ns, name, false);
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439 | if (o != null) {
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440 | return o;
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441 | }
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442 |
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443 | return properties.get(name);
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444 | }
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445 | /**
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446 | * Returns the value of a user property, if it is set.
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447 | *
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448 | * @param ns The namespace for the property (currently not used).
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449 | * @param name The name of the property.
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450 | * May be <code>null</code>, in which case
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451 | * the return value is also <code>null</code>.
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452 | * @return the property value, or <code>null</code> for no match
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453 | * or if a <code>null</code> name is provided.
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454 | */
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455 | public synchronized Object getUserProperty(String ns, String name) {
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456 | if (name == null) {
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457 | return null;
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458 | }
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459 | Object o = getPropertyHook(ns, name, true);
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460 | if (o != null) {
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461 | return o;
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462 | }
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463 | return userProperties.get(name);
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464 | }
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465 |
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466 |
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467 | // -------------------- Access to property tables --------------------
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468 | // This is used to support ant call and similar tasks. It should be
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469 | // deprecated, it is possible to use a better (more efficient)
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470 | // mechanism to preserve the context.
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471 |
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472 | // TODO: do we need to delegate ?
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473 |
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474 | /**
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475 | * Returns a copy of the properties table.
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476 | * @return a hashtable containing all properties
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477 | * (including user properties).
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478 | */
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479 | public Hashtable getProperties() {
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480 | return new Hashtable(properties);
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481 | // There is a better way to save the context. This shouldn't
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482 | // delegate to next, it's for backward compatibility only.
|
---|
483 | }
|
---|
484 |
|
---|
485 | /**
|
---|
486 | * Returns a copy of the user property hashtable
|
---|
487 | * @return a hashtable containing just the user properties
|
---|
488 | */
|
---|
489 | public Hashtable getUserProperties() {
|
---|
490 | return new Hashtable(userProperties);
|
---|
491 | }
|
---|
492 |
|
---|
493 | /**
|
---|
494 | * Copies all user properties that have not been set on the
|
---|
495 | * command line or a GUI tool from this instance to the Project
|
---|
496 | * instance given as the argument.
|
---|
497 | *
|
---|
498 | * <p>To copy all "user" properties, you will also have to call
|
---|
499 | * {@link #copyUserProperties copyUserProperties}.</p>
|
---|
500 | *
|
---|
501 | * @param other the project to copy the properties to. Must not be null.
|
---|
502 | *
|
---|
503 | * @since Ant 1.6
|
---|
504 | */
|
---|
505 | public void copyInheritedProperties(Project other) {
|
---|
506 | Enumeration e = inheritedProperties.keys();
|
---|
507 | while (e.hasMoreElements()) {
|
---|
508 | String arg = e.nextElement().toString();
|
---|
509 | if (other.getUserProperty(arg) != null) {
|
---|
510 | continue;
|
---|
511 | }
|
---|
512 | Object value = inheritedProperties.get(arg);
|
---|
513 | other.setInheritedProperty(arg, value.toString());
|
---|
514 | }
|
---|
515 | }
|
---|
516 |
|
---|
517 | /**
|
---|
518 | * Copies all user properties that have been set on the command
|
---|
519 | * line or a GUI tool from this instance to the Project instance
|
---|
520 | * given as the argument.
|
---|
521 | *
|
---|
522 | * <p>To copy all "user" properties, you will also have to call
|
---|
523 | * {@link #copyInheritedProperties copyInheritedProperties}.</p>
|
---|
524 | *
|
---|
525 | * @param other the project to copy the properties to. Must not be null.
|
---|
526 | *
|
---|
527 | * @since Ant 1.6
|
---|
528 | */
|
---|
529 | public void copyUserProperties(Project other) {
|
---|
530 | Enumeration e = userProperties.keys();
|
---|
531 | while (e.hasMoreElements()) {
|
---|
532 | Object arg = e.nextElement();
|
---|
533 | if (inheritedProperties.containsKey(arg)) {
|
---|
534 | continue;
|
---|
535 | }
|
---|
536 | Object value = userProperties.get(arg);
|
---|
537 | other.setUserProperty(arg.toString(), value.toString());
|
---|
538 | }
|
---|
539 | }
|
---|
540 |
|
---|
541 | // -------------------- Property parsing --------------------
|
---|
542 | // Moved from ProjectHelper. You can override the static method -
|
---|
543 | // this is used for backward compatibility (for code that calls
|
---|
544 | // the parse method in ProjectHelper).
|
---|
545 |
|
---|
546 | /** Default parsing method. It is here only to support backward compatibility
|
---|
547 | * for the static ProjectHelper.parsePropertyString().
|
---|
548 | */
|
---|
549 | static void parsePropertyStringDefault(String value, Vector fragments,
|
---|
550 | Vector propertyRefs)
|
---|
551 | throws BuildException {
|
---|
552 | int prev = 0;
|
---|
553 | int pos;
|
---|
554 | //search for the next instance of $ from the 'prev' position
|
---|
555 | while ((pos = value.indexOf("$", prev)) >= 0) {
|
---|
556 |
|
---|
557 | //if there was any text before this, add it as a fragment
|
---|
558 | //TODO, this check could be modified to go if pos>prev;
|
---|
559 | //seems like this current version could stick empty strings
|
---|
560 | //into the list
|
---|
561 | if (pos > 0) {
|
---|
562 | fragments.addElement(value.substring(prev, pos));
|
---|
563 | }
|
---|
564 | //if we are at the end of the string, we tack on a $
|
---|
565 | //then move past it
|
---|
566 | if (pos == (value.length() - 1)) {
|
---|
567 | fragments.addElement("$");
|
---|
568 | prev = pos + 1;
|
---|
569 | } else if (value.charAt(pos + 1) != '{') {
|
---|
570 | //peek ahead to see if the next char is a property or not
|
---|
571 | //not a property: insert the char as a literal
|
---|
572 | /*
|
---|
573 | fragments.addElement(value.substring(pos + 1, pos + 2));
|
---|
574 | prev = pos + 2;
|
---|
575 | */
|
---|
576 | if (value.charAt(pos + 1) == '$') {
|
---|
577 | //backwards compatibility two $ map to one mode
|
---|
578 | fragments.addElement("$");
|
---|
579 | prev = pos + 2;
|
---|
580 | } else {
|
---|
581 | //new behaviour: $X maps to $X for all values of X!='$'
|
---|
582 | fragments.addElement(value.substring(pos, pos + 2));
|
---|
583 | prev = pos + 2;
|
---|
584 | }
|
---|
585 |
|
---|
586 | } else {
|
---|
587 | //property found, extract its name or bail on a typo
|
---|
588 | int endName = value.indexOf('}', pos);
|
---|
589 | if (endName < 0) {
|
---|
590 | throw new BuildException("Syntax error in property: "
|
---|
591 | + value);
|
---|
592 | }
|
---|
593 | String propertyName = value.substring(pos + 2, endName);
|
---|
594 | fragments.addElement(null);
|
---|
595 | propertyRefs.addElement(propertyName);
|
---|
596 | prev = endName + 1;
|
---|
597 | }
|
---|
598 | }
|
---|
599 | //no more $ signs found
|
---|
600 | //if there is any tail to the file, append it
|
---|
601 | if (prev < value.length()) {
|
---|
602 | fragments.addElement(value.substring(prev));
|
---|
603 | }
|
---|
604 | }
|
---|
605 |
|
---|
606 | }
|
---|