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| 3 | <head>
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| 4 | <meta http-equiv="Content-Language" content="en-us">
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| 5 | <title>Typedef Task</title>
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| 6 | <link rel="stylesheet" type="text/css" href="../stylesheets/antmanual.css">
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| 7 | </head>
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| 8 |
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| 9 | <body>
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| 10 |
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| 11 | <h2><a name="typedef">Typedef</a></h2>
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| 12 | <h3>Description</h3>
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| 13 | <p>
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| 14 | Adds a task or a data type definition to the current project
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| 15 | such that this new type or task can be used in the current project.
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| 16 | </p>
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| 17 | <p>
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| 18 | Tasks are any class that extend org.apache.tools.ant.Task or
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| 19 | a class that is adapted to a Task using an adapter class.
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| 20 | </p>
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| 21 | <p>
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| 22 | Data types are things like <a href="../using.html#path">paths</a> or
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| 23 | <a href="../CoreTypes/fileset.html">filesets</a> that can be defined at
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| 24 | the project level and referenced via their ID attribute.
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| 25 | Custom data types usually need custom tasks to put them to good use.
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| 26 | </p>
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| 27 | <p>
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| 28 | Two attributes are needed to make a definition,
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| 29 | the name that identifies this data type uniquely, and the full
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| 30 | name of the class (including the packages) that implements this
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| 31 | type.
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| 32 | </p>
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| 33 | <p>
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| 34 | You can also define a group of definitions at once using the file or
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| 35 | resource attributes. These attributes point to files in the format of
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| 36 | Java property files or an xml format.
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| 37 | </p>
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| 38 | <p>
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| 39 | For property files each line defines a single data type in the
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| 40 | format:</p>
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| 41 | <pre>
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| 42 | typename=fully.qualified.java.classname
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| 43 | </pre>
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| 44 |
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| 45 | <p>
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| 46 | The xml format is described in the
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| 47 | <a href="../CoreTypes/antlib.html">Antlib</a>
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| 48 | section.
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| 49 | </p>
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| 50 |
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| 51 | <h3>Parameters</h3>
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| 52 | <table border="1" cellpadding="2" cellspacing="0">
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| 53 | <tr>
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| 54 | <td valign="top"><b>Attribute</b></td>
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| 55 | <td valign="top"><b>Description</b></td>
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| 56 | <td align="center" valign="top"><b>Required</b></td>
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| 57 | </tr>
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| 58 | <tr>
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| 59 | <td valign="top">name</td>
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| 60 | <td valign="top">the name of the data type</td>
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| 61 | <td valign="top" align="center">Yes, unless the file or resource type
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| 62 | attributes have been specified.</td>
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| 63 | </tr>
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| 64 | <tr>
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| 65 | <td valign="top">classname</td>
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| 66 | <td valign="top">the full class name implementing the data type</td>
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| 67 | <td valign="top" align="center">Yes, unless file or resource
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| 68 | have been specified.</td>
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| 69 | </tr>
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| 70 | <tr>
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| 71 | <td valign="top">file</td>
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| 72 | <td valign="top">Name of the file to load definitions from.</td>
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| 73 | <td valign="top" align="center">No</td>
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| 74 | </tr>
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| 75 | <tr>
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| 76 | <td valign="top">resource</td>
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| 77 | <td valign="top">
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| 78 | Name of the resource to load definitions from.
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| 79 | If there is multiple resources of this name in the classpath, and the
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| 80 | format is "properties", the first resource will be loaded, otherwise
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| 81 | all the resources will be loaded.
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| 82 | </td>
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| 83 | <td valign="top" align="center">No</td>
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| 84 | </tr>
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| 85 | <tr>
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| 86 | <td valign="top">format</td>
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| 87 | <td valign="top">The format of the file or resource. The values
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| 88 | are "properties" or "xml". If the value is "properties" the file/resource
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| 89 | is a property file contains name to classname pairs. If the value
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| 90 | is "xml", the file/resource is an xml file/resource structured according
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| 91 | to <a href="../CoreTypes/antlib.html">Antlib</a>.
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| 92 | The default is "properties" unless the file/resource name ends with
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| 93 | ".xml", in which case the format attribute will have the value "xml".
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| 94 | (introduced in ant1.6)
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| 95 | </td>
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| 96 | <td valign="top" align="center">No</td>
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| 97 | </tr>
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| 98 | <tr>
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| 99 | <td valign="top">classpath</td> <td valign="top">the classpath to
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| 100 | use when looking up <code>classname</code>.</td> <td
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| 101 | align="center" valign="top">No</td>
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| 102 | </tr>
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| 103 | <tr>
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| 104 | <td valign="top">classpathref</td>
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| 105 | <td valign="top">
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| 106 | a reference to a classpath to use when looking up <code>classname</code>.</td>
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| 107 | <td align="center" valign="top">No</td>
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| 108 | </tr>
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| 109 | <tr>
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| 110 | <td valign="top">loaderRef</td> <td valign="top">the name of the loader that is
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| 111 | used to load the class, constructed from the specified classpath. Use this to
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| 112 | allow multiple tasks/types to be loaded with the same loader, so they can call
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| 113 | each other. ( introduced in ant1.5 )</td>
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| 114 | <td align="center" valign="top">No</td>
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| 115 | </tr>
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| 116 | <tr>
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| 117 | <td valign="top">onerror</td>
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| 118 | <td valign="top">The action to take if there was a failure in defining the
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| 119 | type. The values are <i>fail</i> - cause a build exception, <i>report</i>,
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| 120 | output a warning, but continue, <i>ignore</i>, do nothing. The default
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| 121 | is <i>fail</i>.
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| 122 | (introduced in ant1.6)
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| 123 | </td>
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| 124 | <td valign="top" align="center">No</td>
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| 125 | </tr>
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| 126 | <tr>
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| 127 | <td valign="top">adapter</td>
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| 128 | <td valign="top">A class that is used to adapt the defined class to
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| 129 | another interface/class. The adapter class must implement the interface
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| 130 | "org.apache.tools.ant.TypeAdapter". The adapter class will be used
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| 131 | to wrap the defined class unless the defined class implements/extends
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| 132 | the class defined by the attribute "adaptto".
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| 133 | If "adaptto" is not set,
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| 134 | the defined class will always be wrapped.
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| 135 | (introduced in ant1.6)
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| 136 | </td>
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| 137 | <td valign="top" align="center">No</td>
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| 138 | </tr>
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| 139 | <tr>
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| 140 | <td valign="top">adaptto</td>
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| 141 | <td valign="top">This attribute is used in conjunction with the
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| 142 | adapter attribute.
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| 143 | If the defined class does not implement/extend the interface/class
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| 144 | specified by this attribute, the adaptor class will be used
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| 145 | to wrap the class.
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| 146 | (introduced in ant1.6)
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| 147 | </td>
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| 148 | <td valign="top" align="center">No</td>
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| 149 | </tr>
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| 150 | <tr>
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| 151 | <td valign="top">uri</td>
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| 152 | <td valign="top">
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| 153 | The uri that this definition should live in.
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| 154 | <em>since Ant1.6</em>
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| 155 | </td>
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| 156 | <td valign="top" align="center">No</td>
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| 157 | </tr>
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| 158 | </table>
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| 159 | <h3>Parameters specified as nested elements</h3>
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| 160 | <h4>classpath</h4>
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| 161 | <p><code>Typedef</code>'s <i>classpath</i> attribute is a
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| 162 | <a href="../using.html#path">PATH like structure</a> and can also be set
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| 163 | via a nested <i>classpath</i> element.</p>
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| 164 |
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| 165 | <h3>Examples</h3>
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| 166 | The following fragment defines define a type called <i>urlset</i>.
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| 167 | <pre>
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| 168 | <typedef name="urlset" classname="com.mydomain.URLSet"/> </pre>
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| 169 | The data type is now available to Ant. The
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| 170 | class <code>com.mydomain.URLSet</code> implements this type.</p>
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| 171 | <p>
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| 172 | Assuming a class <i>org.acme.ant.RunnableAdapter</i> that
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| 173 | extends Task and implements <i>org.apache.tools.ant.TypeAdapter</i>,
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| 174 | and in the execute method invokes <i>run</i> on the proxied object,
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| 175 | one may use a Runnable class as an Ant task. The following fragment
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| 176 | defines a task called <i>runclock</i>.
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| 177 | </p>
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| 178 | <pre>
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| 179 | <typedef name="runclock"
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| 180 | classname="com.acme.ant.RunClock"
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| 181 | adapter="org.acme.ant.RunnableAdapter"/>
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| 182 | </pre>
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| 183 | <p>
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| 184 | The following fragment shows the use of the classpathref and
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| 185 | loaderref to load up two definitions.
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| 186 | </p>
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| 187 | <pre>
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| 188 | <path id="lib.path">
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| 189 | <fileset dir="lib" includes="lib/*.jar"/>
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| 190 | </path>
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| 191 |
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| 192 | <typedef name="filter1"
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| 193 | classname="org.acme.filters.Filter1"
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| 194 | classpathref="lib.path"
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| 195 | loaderref="lib.path.loader"
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| 196 | />
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| 197 | <typedef name="filter2"
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| 198 | classname="org.acme.filters.Filter2"
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| 199 | loaderref="lib.path.loader"
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| 200 | />
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| 201 | </pre>
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| 202 | <hr>
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| 203 | <p align="center">Copyright © 2001-2004 The Apache Software
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| 204 | Foundation. All rights Reserved.</p>
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| 205 |
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| 206 | </body>
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| 207 | </html>
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| 208 |
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