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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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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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<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>jarlib-resolve Task</title>
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</head>
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<body>
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<h2 id="jarlib-resolve">jarlib-resolve</h2>
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<h3>Description</h3>
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<p>Try to locate a jar to satisfy an extension and place location of jar into property. The task
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allows you to add a number of resolvers that are capable of locating a library for a specific
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extension. Each resolver will be attempted in specified order until library is found or no resolvers
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are left. If no resolvers are left and <var>failOnError</var> is true then
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a <code>BuildException</code> will be thrown.</p>
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<p>Note that this task works with extensions as defined by the "Optional Package" specification.
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For more information about optional packages, see the document <em>Optional Package Versioning</em>
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in the documentation bundle for your Java Standard Edition package, in
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file <code>guide/extensions/versioning.html</code> or the
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online <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/extensions/versioning.html"
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target="_top">Extension and ExtensionSet documentation</a> for further details.</p>
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<h3>Parameters</h3>
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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>property</td>
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<td>The name of property to set to library location.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>failOnError</td>
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<td><q>true</q> if failure to locate library should result in build exception.</td>
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<td>No; defaults to <q>true</q></td>
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</tr>
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<tr>
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<td>checkExtension</td>
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<td><q>true</q> if libraries returned by nested resolvers should be checked to see if they
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supply extension.</td>
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<td>No; defaults to <q>true</q></td>
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</tr>
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</table>
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<h3>Parameters specified as nested elements</h3>
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<h4>extension</h4>
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<p><a href="../Types/extension.html">Extension</a> the extension to resolve. Must be present</p>
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<h4>location</h4>
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<p>The <code>location</code> nested element allows you to look for a library in a location relative
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to project directory.</p>
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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>location</td>
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<td>The pathname of library.</td>
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<td>Yes</td>
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</tr>
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</table>
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<h4>url</h4>
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<p>The <code>url</code> resolver allows you to download a library from a URL to a local file.</p>
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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>url</td>
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<td>The URL to download.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>destfile</td>
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<td>The file to download URL into.</td>
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<td rowspan="2">Exactly one of the two</td>
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</tr>
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<tr>
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<td>destdir</td>
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<td class="left">The directory in which to place downloaded file.</td>
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</tr>
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</table>
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<h4>ant</h4>
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<p>The <code>ant</code> resolver allows you to run an Apache Ant build file to generate a
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library.</p>
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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>antfile</td>
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<td>The build file.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>destfile</td>
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<td>The file that the ant build creates.</td>
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<td>Yes</td>
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</tr>
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<tr>
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<td>target</td>
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<td>The target to run in build file.</td>
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<td>No</td>
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</tr>
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</table>
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<h3>Examples</h3>
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<p>Resolve Extension to file. If file does not exist or file does not implement extension then throw
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an exception.</p>
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<pre>
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<extension id="dve.ext"
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extensionName="org.realityforge.dve"
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specificationVersion="1.2"
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specificationVendor="Peter Donald"/>
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<jarlib-resolve property="dve.library">
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<extension refid="dve.ext"/>
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<location location="/opt/jars/dve.jar"/>
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</jarlib-resolve></pre>
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<p>Resolve Extension to URL. If URL does not exist or can not write to <var>destfile</var> or file
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does not implement extension then throw an exception.</p>
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<pre>
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<extension id="dve.ext"
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extensionName="org.realityforge.dve"
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specificationVersion="1.2"
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specificationVendor="Peter Donald"/>
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<jarlib-resolve property="dve.library">
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<extension refid="dve.ext"/>
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<url url="http://www.realityforge.net/jars/dve.jar" destfile="lib/dve.jar"/>
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</jarlib-resolve></pre>
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<p>Resolve Extension to file produce by Ant build. If file does not get produced or Ant file is
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missing or build fails then throw an exception. (<strong>Note</strong>: does not check that library
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implements extension.)</p>
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<pre>
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<extension id="dve.ext"
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extensionName="org.realityforge.dve"
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specificationVersion="1.2"
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specificationVendor="Peter Donald"/>
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<jarlib-resolve property="dve.library" checkExtension="false">
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<extension refid="dve.ext"/>
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<ant antfile="../dve/build.xml" target="main" destfile="lib/dve.jar"/>
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</jarlib-resolve></pre>
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<p>Resolve Extension via multiple methods. First check local file to see if it implements
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extension. If it does not then try to build it from source in parallel directory. If that fails then
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finally try to download it from a website. If all steps fail then throw a build exception.</p>
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<pre>
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<extension id="dve.ext"
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extensionName="org.realityforge.dve"
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specificationVersion="1.2"
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specificationVendor="Peter Donald"/>
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<jarlib-resolve property="dve.library">
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<extension refid="dve.ext"/>
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<location location="/opt/jars/dve.jar"/>
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<ant antfile="../dve/build.xml" target="main" destfile="lib/dve.jar"/>
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<url url="http://www.realityforge.net/jars/dve.jar" destfile="lib/dve.jar"/>
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</jarlib-resolve></pre>
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</body>
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</html>
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