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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>PropertyHelper Task</title>
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</head>
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<body>
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<h2>PropertyHelper</h2>
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<p><em>Since Ant 1.8.0</em></p>
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<h3>Description</h3>
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<p>This task is provided for the purpose of allowing the user to <strong>(a)</strong> install a
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different <code>PropertyHelper</code> at run time, or <strong>(b)</strong> (hopefully more often)
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install one or more <code class="code">PropertyHelper</code> Delegates into
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the <code class="code">PropertyHelper</code> active on the
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current <code class="code">Project</code>. This is somewhat advanced Apache Ant usage and assumes a
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working familiarity with the modern Ant APIs. See the description of
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Ant's <a href="../properties.html#propertyHelper">Property Helper</a> for more information.</p>
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<h3>Parameters specified as nested elements</h3>
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<h4>PropertyHelper</h4>
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<p>You may specify exactly one configured <code>org.apache.tools.ant.PropertyHelper</code>
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instance.</p>
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<h4>PropertyHelper.Delegate</h4>
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<p>You may specify, either in conjunction with a new <code class="code">PropertyHelper</code> or
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not, one or more configured implementations of
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the <code class="code">org.apache.tools.ant.PropertyHelper.Delegate</code> interface. A deeper
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understanding of the API is required here, however, as <code class="code">Delegate</code> is a
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marker interface only: the nested arguments must implement a <code class="code">Delegate</code>
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subinterface in order to do anything meaningful.</p>
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<h4>delegate</h4>
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<p>A generic <code><delegate></code> element which can use project references is also
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provided:</p>
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<h5>Parameters</h5>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>refid</td>
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<td>The <var>id</var> of a <code>PropertyHelper.Delegate</code> to install.</td>
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<td>Yes</td>
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</tr>
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</table>
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<h3>Examples</h3>
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<p>Install a completely different <code class="code">PropertyHelper</code> implementation
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(assuming <code class="code">MyPropertyHelper extends PropertyHelper</code>):</p>
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<pre>
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<componentdef classname="org.example.MyPropertyHelper"
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name="mypropertyhelper"/>
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<propertyhelper>
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<mypropertyhelper/>
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</propertyhelper>
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</pre>
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<p>Add a new <code class="code">PropertyEvaluator</code> delegate
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(assuming <code class="code">MyPropertyEvaluator implements
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PropertyHelper.PropertyEvaluator</code>). Note that <code class="code">PropertyHelper</code> uses
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the configured delegates in LIFO order. I.e. the delegate added by this task will be consulted
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before any previously defined delegate and in particular before the built-in ones.</p>
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<pre>
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<componentdef classname="org.example.MyPropertyEvaluator"
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name="mypropertyevaluator"/>
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<propertyhelper>
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<mypropertyevaluator/>
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</propertyhelper>
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</pre>
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<p>Add a new <code class="code">PropertyEvaluator</code> delegate using the <var>refid</var>
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syntax:</p>
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<pre>
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<typedef classname="org.example.MyPropertyEvaluator"
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name="mypropertyevaluator"/>
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<mypropertyevaluator id="evaluator"/>
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<propertyhelper>
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<delegate refid="evaluator"/>
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</propertyhelper>
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</pre>
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</body>
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</html>
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