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<div class="subTitle">org.apache.tools.ant.util</div>
<h2 title="Class ClasspathUtils" class="title">Class ClasspathUtils</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.apache.tools.ant.util.ClasspathUtils</li>
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<pre>public class <span class="strong">ClasspathUtils</span>
extends java.lang.Object</pre>
<div class="block">Offers some helper methods on the Path structure in ant.
<p>The basic idea behind this utility class is to use it from inside the
different Ant objects (and user defined objects) that need classLoading
for their operation.
Normally those would have a setClasspathRef() {for the @classpathref}
and/or a createClasspath() {for the nested <classpath>}
Typically one would have in your Ant Task or DataType</p>
<pre><code>
ClasspathUtils.Delegate cpDelegate;
public void init() {
this.cpDelegate = ClasspathUtils.getDelegate(this);
super.init();
}
public void setClasspathRef(Reference r) {
this.cpDelegate.setClasspathRef(r);
}
public Path createClasspath() {
return this.cpDelegate.createClasspath();
}
public void setClassname(String fqcn) {
this.cpDelegate.setClassname(fqcn);
}
</code></pre>
<p>At execution time, when you actually need the classloading
you can just:</p>
<pre><code>
Object o = this.cpDelegate.newInstance();
</code></pre></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>Ant 1.6</dd></dl>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static class </code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.Delegate.html" title="class in org.apache.tools.ant.util">ClasspathUtils.Delegate</a></strong></code>
<div class="block">Delegate that helps out any specific ProjectComponent that needs
dynamic classloading.</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#REUSE_LOADER_REF">REUSE_LOADER_REF</a></strong></code>
<div class="block">Name of the magic property that controls classloader reuse in Ant 1.4.</div>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#ClasspathUtils()">ClasspathUtils</a></strong>()</code> </td>
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<td class="colFirst"><code>static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String)">getClassLoaderForPath</a></strong>(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
java.lang.String loaderId)</code>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean)"><code>getClassLoaderForPath(Project, Path, String, boolean)</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean)">getClassLoaderForPath</a></strong>(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
java.lang.String loaderId,
boolean reverseLoader)</code>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean, boolean)"><code>getClassLoaderForPath(Project, Path, String, boolean, boolean)</code></a>.</div>
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<tr class="altColor">
<td class="colFirst"><code>static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean, boolean)">getClassLoaderForPath</a></strong>(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
java.lang.String loaderId,
boolean reverseLoader,
boolean reuseLoader)</code>
<div class="block">Gets a classloader that loads classes from the classpath
defined in the path argument.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Reference)">getClassLoaderForPath</a></strong>(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Reference.html" title="class in org.apache.tools.ant.types">Reference</a> ref)</code>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Reference, boolean)"><code>getClassLoaderForPath(Project, Reference, boolean)</code></a>.</div>
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<tr class="altColor">
<td class="colFirst"><code>static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Reference, boolean)">getClassLoaderForPath</a></strong>(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Reference.html" title="class in org.apache.tools.ant.types">Reference</a> ref,
boolean reverseLoader)</code>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean)"><code>getClassLoaderForPath(Project, Path,
String, boolean)</code></a>.</div>
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<td class="colFirst"><code>static <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.Delegate.html" title="class in org.apache.tools.ant.util">ClasspathUtils.Delegate</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getDelegate(org.apache.tools.ant.ProjectComponent)">getDelegate</a></strong>(<a href="../../../../../org/apache/tools/ant/ProjectComponent.html" title="class in org.apache.tools.ant">ProjectComponent</a> component)</code>
<div class="block">Obtains a delegate that helps out with classic classpath configuration.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.ClassLoader</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getUniqueClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, boolean)">getUniqueClassLoaderForPath</a></strong>(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
boolean reverseLoader)</code>
<div class="block">Gets a fresh, different, previously unused classloader that uses the
passed path as its classpath.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#newInstance(java.lang.String, java.lang.ClassLoader)">newInstance</a></strong>(java.lang.String className,
java.lang.ClassLoader userDefinedLoader)</code>
<div class="block">Creates a fresh object instance of the specified classname.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#newInstance(java.lang.String, java.lang.ClassLoader, java.lang.Class)">newInstance</a></strong>(java.lang.String className,
java.lang.ClassLoader userDefinedLoader,
java.lang.Class expectedType)</code>
<div class="block">Creates a fresh object instance of the specified classname.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public static final java.lang.String REUSE_LOADER_REF</pre>
<div class="block">Name of the magic property that controls classloader reuse in Ant 1.4.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.tools.ant.util.ClasspathUtils.REUSE_LOADER_REF">Constant Field Values</a></dd></dl>
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<pre>public ClasspathUtils()</pre>
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<pre>public static java.lang.ClassLoader getClassLoaderForPath(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Reference.html" title="class in org.apache.tools.ant.types">Reference</a> ref)</pre>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Reference, boolean)"><code>getClassLoaderForPath(Project, Reference, boolean)</code></a>.
<p>Assumes the logical 'false' for the reverseLoader.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - the project</dd><dd><code>ref</code> - the reference</dd>
<dt><span class="strong">Returns:</span></dt><dd>The class loader</dd></dl>
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<pre>public static java.lang.ClassLoader getClassLoaderForPath(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Reference.html" title="class in org.apache.tools.ant.types">Reference</a> ref,
boolean reverseLoader)</pre>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean)"><code>getClassLoaderForPath(Project, Path,
String, boolean)</code></a>.
<p>Delegates to the other one after extracting the referenced
Path from the Project. This checks also that the passed
Reference is pointing to a Path all right.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - current Ant project</dd><dd><code>ref</code> - Reference to Path structure</dd><dd><code>reverseLoader</code> - if set to true this new loader will take
precedence over its parent (which is contra the regular
classloader behaviour)</dd>
<dt><span class="strong">Returns:</span></dt><dd>The class loader</dd></dl>
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<pre>public static java.lang.ClassLoader getClassLoaderForPath(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
java.lang.String loaderId)</pre>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean)"><code>getClassLoaderForPath(Project, Path, String, boolean)</code></a>.
<p>Assumes the logical 'false' for the reverseLoader.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - current Ant project</dd><dd><code>path</code> - the path</dd><dd><code>loaderId</code> - the loader id string</dd>
<dt><span class="strong">Returns:</span></dt><dd>The class loader</dd></dl>
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<pre>public static java.lang.ClassLoader getClassLoaderForPath(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
java.lang.String loaderId,
boolean reverseLoader)</pre>
<div class="block">Convenience overloaded version of <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.html#getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean, boolean)"><code>getClassLoaderForPath(Project, Path, String, boolean, boolean)</code></a>.
<p>Sets value for 'reuseLoader' to true if the magic property
has been set.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - the project</dd><dd><code>path</code> - the path</dd><dd><code>loaderId</code> - the loader id string</dd><dd><code>reverseLoader</code> - if set to true this new loader will take
precedence over its parent (which is contra the regular
classloader behaviour)</dd>
<dt><span class="strong">Returns:</span></dt><dd>The class loader</dd></dl>
</li>
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<a name="getClassLoaderForPath(org.apache.tools.ant.Project, org.apache.tools.ant.types.Path, java.lang.String, boolean, boolean)">
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<pre>public static java.lang.ClassLoader getClassLoaderForPath(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
java.lang.String loaderId,
boolean reverseLoader,
boolean reuseLoader)</pre>
<div class="block">Gets a classloader that loads classes from the classpath
defined in the path argument.
<p>Based on the setting of the magic property
'ant.reuse.loader' this will try to reuse the previously
created loader with that id, and of course store it there upon
creation.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - Ant Project where the handled components are living in.</dd><dd><code>path</code> - Path object to be used as classpath for this classloader</dd><dd><code>loaderId</code> - identification for this Loader,</dd><dd><code>reverseLoader</code> - if set to true this new loader will take
precedence over its parent (which is contra the regular
classloader behaviour)</dd><dd><code>reuseLoader</code> - if true reuse the loader if it is found</dd>
<dt><span class="strong">Returns:</span></dt><dd>ClassLoader that uses the Path as its classpath.</dd></dl>
</li>
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<pre>public static java.lang.ClassLoader getUniqueClassLoaderForPath(<a href="../../../../../org/apache/tools/ant/Project.html" title="class in org.apache.tools.ant">Project</a> p,
<a href="../../../../../org/apache/tools/ant/types/Path.html" title="class in org.apache.tools.ant.types">Path</a> path,
boolean reverseLoader)</pre>
<div class="block">Gets a fresh, different, previously unused classloader that uses the
passed path as its classpath.
<p>This method completely ignores the ant.reuse.loader magic
property and should be used with caution.</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>p</code> - Ant Project where the handled components are living in.</dd><dd><code>path</code> - the classpath for this loader</dd><dd><code>reverseLoader</code> - if set to true this new loader will take
precedence over its parent (which is contra the regular
classloader behaviour)</dd>
<dt><span class="strong">Returns:</span></dt><dd>The fresh, different, previously unused class loader.</dd></dl>
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<pre>public static java.lang.Object newInstance(java.lang.String className,
java.lang.ClassLoader userDefinedLoader)</pre>
<div class="block">Creates a fresh object instance of the specified classname.
<p> This uses the userDefinedLoader to load the specified class,
and then makes an instance using the default no-argument constructor.
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>className</code> - the full qualified class name to load.</dd><dd><code>userDefinedLoader</code> - the classloader to use.</dd>
<dt><span class="strong">Returns:</span></dt><dd>The fresh object instance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/tools/ant/BuildException.html" title="class in org.apache.tools.ant">BuildException</a></code> - when loading or instantiation failed.</dd></dl>
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<h4>newInstance</h4>
<pre>public static java.lang.Object newInstance(java.lang.String className,
java.lang.ClassLoader userDefinedLoader,
java.lang.Class expectedType)</pre>
<div class="block">Creates a fresh object instance of the specified classname.
<p> This uses the userDefinedLoader to load the specified class,
and then makes an instance using the default no-argument constructor.
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>className</code> - the full qualified class name to load.</dd><dd><code>userDefinedLoader</code> - the classloader to use.</dd><dd><code>expectedType</code> - the Class that the result should be assignment
compatible with. (No ClassCastException will be thrown in case
the result of this method is casted to the expectedType)</dd>
<dt><span class="strong">Returns:</span></dt><dd>The fresh object instance</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../../../org/apache/tools/ant/BuildException.html" title="class in org.apache.tools.ant">BuildException</a></code> - when loading or instantiation failed.</dd><dt><span class="strong">Since:</span></dt>
<dd>Ant 1.7</dd></dl>
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<h4>getDelegate</h4>
<pre>public static <a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.Delegate.html" title="class in org.apache.tools.ant.util">ClasspathUtils.Delegate</a> getDelegate(<a href="../../../../../org/apache/tools/ant/ProjectComponent.html" title="class in org.apache.tools.ant">ProjectComponent</a> component)</pre>
<div class="block">Obtains a delegate that helps out with classic classpath configuration.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>component</code> - your projectComponent that needs the assistence</dd>
<dt><span class="strong">Returns:</span></dt><dd>the helper, delegate.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/tools/ant/util/ClasspathUtils.Delegate.html" title="class in org.apache.tools.ant.util"><code>ClasspathUtils.Delegate</code></a></dd></dl>
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