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2 | Licensed to the Apache Software Foundation (ASF) under one or more
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5 | The ASF licenses this file to You under the Apache License, Version 2.0
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9 | http://www.apache.org/licenses/LICENSE-2.0
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10 |
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11 | Unless required by applicable law or agreed to in writing, software
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12 | distributed under the License is distributed on an "AS IS" BASIS,
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13 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 | limitations under the License.
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17 | <html>
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18 |
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19 | <head>
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20 | <meta http-equiv="Content-Language" content="en-us"></meta>
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21 | <link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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22 | <title>AntLib</title>
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23 | </head>
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24 |
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25 | <body>
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26 | <h2><a name="antlib">Antlib</a></h2>
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27 |
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28 |
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29 | <h3>Description</h3>
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30 | <p>
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31 | An antlib file is an xml file with a root element of "antlib".
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32 | Antlib's elements are ant definition tasks - like
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33 |
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34 | and <a href="../CoreTasks/taskdef.html">Taskdef</a>,
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35 | or any ant task that extends
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36 | <code>org.apache.tools.ant.taskdefs.AntlibDefinition</code>.
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37 | </p>
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38 | <p>
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39 | The current set of declarations bundled with Ant that do this are:
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40 | </p>
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41 | <ol>
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42 | <li><a href="../CoreTasks/typedef.html">Typedef</a>
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43 | </li>
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44 | <li><a href="../CoreTasks/taskdef.html">Taskdef</a>
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45 | </li>
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46 | <li><a href="../CoreTasks/macrodef.html">Macrodef</a>
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47 | </li>
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48 | <li><a href="../CoreTasks/presetdef.html">Presetdef</a>
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49 | </li>
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50 | <li><a href="../OptionalTasks/scriptdef.html">Scriptdef</a>
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51 | </li>
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52 | </ol>
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53 | <p>
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54 | A group of tasks and types may be defined together in an antlib
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55 | file. For example the file <i>sample.xml</i> contains the following:
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56 | </p>
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57 | <blockquote>
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58 | <pre>
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59 | <?xml version="1.0"?>
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60 | <antlib>
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61 | <typedef name="if" classname="org.acme.ant.If"/>
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62 | <typedef name="scriptpathmapper"
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63 | classname="org.acme.ant.ScriptPathMapper"
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64 | onerror="ignore"/>
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65 | <macrodef name="print">
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66 | <attribute name="file"/>
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67 | <sequential>
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68 | <concat taskname="print">
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69 | <fileset dir="." includes="@{file}"/>
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70 | </concat>
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71 | </sequential>
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72 | </macrodef>
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73 | </antlib>
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74 | </pre>
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75 | </blockquote>
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76 | <p>
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77 | It defines two types or tasks, <i>if</i> and <i>scriptpathmapper</i>.
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78 | This antlib file may be used in a build script as follows:
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79 | </p>
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80 | <blockquote>
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81 | <pre>
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82 | <typedef file="sample.xml"/>
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83 | </pre>
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84 | </blockquote>
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85 | <p>
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86 | The other attributes of <code><typedef></code> may be used as well.
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87 | For example, assuming that the <i>sample.xml</i> is in a jar
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88 | file <i>sample.jar</i> also containing the classes, the
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89 | following build fragment will define the <i>if</i> and <i>scriptpathmapper</i>
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90 | tasks/types and place them in the namespace uri <i>samples:/acme.org</i>.
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91 | </p>
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92 | <blockquote>
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93 | <pre>
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94 | <typedef resource="org/acme/ant/sample.xml"
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95 | uri="samples:/acme.org"/>
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96 | </pre>
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97 | </blockquote>
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98 | <p>
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99 | The definitions may then be used as follows:
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100 | </p>
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101 | <blockquote>
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102 | <pre>
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103 | <sample:if valuetrue="${props}" xmlns:sample="samples:/acme.org">
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104 | <sample:scriptpathmapper language="beanshell">
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105 | some bean shell
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106 | </sample:scriptpathmapper>
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107 | </sample:if>
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108 | </pre>
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109 | </blockquote>
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110 |
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111 |
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112 | <h3><a name="antlibnamespace">Antlib namespace</a></h3>
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113 | <p>
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114 | The name space URIs with the pattern <b>antlib:<i>java package</i></b>
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115 | are given special treatment.
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116 | </p>
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117 | <p>
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118 | When ant encounters a element with a namespace URI with this pattern, it
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119 | will check to see if there is a resource of the name <i>antlib.xml</i> in
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120 | the package directory in the default classpath.
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121 | </p>
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122 | <p>
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123 | For example, assuming that the file <i>antcontrib.jar</i> has been placed
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124 | in the directory <i>${ant.home}/lib</i> and it contains the resource
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125 | <i>net/sf/antcontrib/antlib.xml</i> which has all antcontrib's definitions
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126 | defined, the following build file will automatically load the antcontrib
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127 | definitions at location <i>HERE</i>:
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128 | </p>
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129 | <blockquote>
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130 | <pre>
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131 | <project default="deletetest" xmlns:antcontrib="antlib:net.sf.antcontrib">
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132 | <macrodef name="showdir">
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133 | <attribute name="dir"/>
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134 | <sequential>
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135 | <antcontrib:shellscript shell="bash"> <!-- HERE -->
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136 | ls -Rl @{dir}
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137 | </antcontrib:shellscript>
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138 | </sequential>
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139 | </macrodef>
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140 |
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141 | <target name="deletetest">
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142 | <delete dir="a" quiet="yes"/>
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143 | <mkdir dir="a/b"/>
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144 | <touch file="a/a.txt"/>
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145 | <touch file="a/b/b.txt"/>
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146 | <delete>
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147 | <fileset dir="a"/>
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148 | </delete>
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149 | <showdir dir="a"/>
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150 | </target>
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151 | </project>
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152 | </pre>
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153 | </blockquote>
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154 | <p>
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155 | The requirement that the resource is in the default classpath
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156 | may be removed in future versions of Ant.</p>
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157 | </p>
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158 |
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159 |
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160 | <h3><a name="loadFromInside">Load antlib from inside of the buildfile</a></h3>
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161 | <p>
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162 | If you want to seperate the antlib from your local Ant installation, e.g. because you
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163 | want to hold that jar in your projects SCM system, you have to specify a classpath, so
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164 | that Ant could find that jar. The best solution is loading the antlib with <tt><taskdef></tt>.
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165 | </p>
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166 | <blockquote>
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167 | <pre>
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168 | <project xmlns:<font color="green">antcontrib</font>="<font color="red">antlib:net.sf.antcontrib</font>">
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169 | <taskdef uri="<font color="red">antlib:net.sf.antcontrib</font>"
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170 | resource="net/sf/antcontrib/antlib.xml"
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171 | classpath="path/to/ant-contrib.jar"/>
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172 |
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173 | <target name="iterate">
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174 | <<font color="green">antcontrib</font>:for param="file">
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175 | <fileset dir="."/>
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176 | <sequential>
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177 | <echo message="- @{file}"/>
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178 | </sequential>
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179 | </antcontrib:for>
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180 | </target>
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181 | </project>
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182 | </pre>
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183 | </blockquote>
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184 |
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185 |
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186 |
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187 |
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188 | <h3><a name="currentnamespace">Current namespace</a></h3>
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189 | <p>
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190 | Definitions defined in antlibs may be used in antlibs. However
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191 | the namespace that definitions are placed in are dependent on
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192 | the <code><typedef></code> that uses the antlib. To deal with this
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193 | problem, the definitions are placed in the namepace URI <i>ant:current</i>
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194 | for the duration of the antlib execution.
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195 | For example the following antlib defines the task <code><if></code>, the
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196 | type <code><isallowed></code> and a macro
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197 | <code><ifallowed></code> that makes use of the task and type:
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198 | </p>
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199 | <blockquote>
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200 | <pre>
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201 | <antlib xmlns:current="ant:current">
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202 | <taskdef name="if" classname="org.acme.ant.If"/>
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203 | <typedef name="isallowed" classname="org.acme.ant.Isallowed"/>
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204 | <macrodef name="ifallowed">
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205 | <attribute name="action"/>
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206 | <element name="do"/>
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207 | <sequential>
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208 | <current:if>
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209 | <current:isallowed test="@{action}"/>
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210 | <current:then>
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211 | <do/>
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212 | </current:then>
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213 | </current:if>
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214 | </sequential>
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215 | </macrodef>
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216 | </antlib>
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217 | </pre>
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218 | </blockquote>
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219 |
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220 |
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221 | <h3>Other examples and comments</h3>
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222 | <p>
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223 | Antlibs may make use of other antlibs.
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224 | </p>
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225 | <p>
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226 | As the names defined in the antlib are in the namespace uri as
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227 | specified by the calling <code><typedef></code> or by automatic element
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228 | resolution, one may reuse names from core ant types and tasks,
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229 | provided the caller uses a namespace uri. For example, the
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230 | following antlib may be used to define defaults for various
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231 | tasks:
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232 | </p>
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233 | <blockquote>
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234 | <pre>
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235 | <antlib xmlns:antcontrib="antlib:net.sf.antcontrib">
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236 | <presetdef name="javac">
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237 | <javac deprecation="${deprecation}"
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238 | debug="${debug}"/>
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239 | </presetdef>
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240 | <presetdef name="delete">
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241 | <delete quiet="yes"/>
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242 | </presetdef>
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243 | <presetdef name="shellscript">
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244 | <antcontrib:shellscript shell="bash"/>
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245 | </presetdef>
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246 | </antlib>
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247 | </pre>
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248 | </blockquote>
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249 | <p>
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250 | This may be used as follows:
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251 | </p>
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252 | <blockquote>
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253 | <pre>
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254 | <project xmlns:local="localpresets">
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255 | <typedef file="localpresets.xml" uri="localpresets"/>
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256 | <local:shellscript>
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257 | echo "hello world"
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258 | </local:shellscript>
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259 | </project>
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260 | </pre>
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261 | </blockquote>
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262 |
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263 |
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264 |
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265 | </body>
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266 | </html>
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267 |
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