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| <div class="subTitle">org.apache.logging.log4j.core.config.plugins.util</div> |
| <h2 title="Class ResolverUtil" class="title">Class ResolverUtil</h2> |
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| <li>org.apache.logging.log4j.core.config.plugins.util.ResolverUtil</li> |
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| <pre>public class <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.83">ResolverUtil</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block"><p> |
| ResolverUtil is used to locate classes that are available in the/a class path and meet arbitrary conditions. The two |
| most common conditions are that a class implements/extends another class, or that is it annotated with a specific |
| annotation. However, through the use of the <a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util"><code>ResolverUtil.Test</code></a> class it is possible to search using arbitrary conditions. |
| </p> |
| |
| <p> |
| A ClassLoader is used to locate all locations (directories and jar files) in the class path that contain classes |
| within certain packages, and then to load those classes and check them. By default the ClassLoader returned by |
| <code>Thread.currentThread().getContextClassLoader()</code> is used, but this can be overridden by calling |
| <a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#setClassLoader-java.lang.ClassLoader-"><code>setClassLoader(ClassLoader)</code></a> prior to invoking any of the <code>find()</code> methods. |
| </p> |
| |
| <p> |
| General searches are initiated by calling the <a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#find-org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.Test-java.lang.String...-"><code>find(ResolverUtil.Test, String...)</code></a> method and supplying a |
| package name and a Test instance. This will cause the named package <b>and all sub-packages</b> to be scanned for |
| classes that meet the test. There are also utility methods for the common use cases of scanning multiple packages for |
| extensions of particular classes, or classes annotated with a specific annotation. |
| </p> |
| |
| <p> |
| The standard usage pattern for the ResolverUtil class is as follows: |
| </p> |
| |
| <pre> |
| ResolverUtil resolver = new ResolverUtil(); |
| resolver.findInPackage(new CustomTest(), pkg1); |
| resolver.find(new CustomTest(), pkg1); |
| resolver.find(new CustomTest(), pkg1, pkg2); |
| Set<Class<?>> beans = resolver.getClasses(); |
| </pre> |
| |
| <p> |
| This class was copied and modified from Stripes - http://stripes.mc4j.org/confluence/display/stripes/Home |
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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 interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a></span></code> |
| <div class="block">A simple interface that specifies how to test classes to determine if they are to be included in the results |
| produced by the ResolverUtil.</div> |
| </td> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#ResolverUtil--">ResolverUtil</a></span>()</code> </td> |
| </tr> |
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| <tr> |
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| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#addIfMatching-org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.Test-java.lang.String-">addIfMatching</a></span>(<a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a> test, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> fqn)</code> |
| <div class="block">Add the class designated by the fully qualified class name provided to the set of resolved classes if and only if |
| it is approved by the Test supplied.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#find-org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.Test-java.lang.String...-">find</a></span>(<a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a> test, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>... packageNames)</code> |
| <div class="block">Attempts to discover classes that pass the test.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#findInPackage-org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.Test-java.lang.String-">findInPackage</a></span>(<a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a> test, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> packageName)</code> |
| <div class="block">Scans for classes starting at the package provided and descending into subpackages.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#getClasses--">getClasses</a></span>()</code> |
| <div class="block">Provides access to the classes discovered so far.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#getClassLoader--">getClassLoader</a></span>()</code> |
| <div class="block">Returns the ClassLoader that will be used for scanning for classes.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#getResources--">getResources</a></span>()</code> |
| <div class="block">Returns the matching resources.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#setClassLoader-java.lang.ClassLoader-">setClassLoader</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</a> aClassloader)</code> |
| <div class="block">Sets an explicit ClassLoader that should be used when scanning for classes.</div> |
| </td> |
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| </ul> |
| </li> |
| </ul> |
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| </ul> |
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| <h3>Constructor Detail</h3> |
| <a name="ResolverUtil--"> |
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| </a> |
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| <h4>ResolverUtil</h4> |
| <pre>public <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.83">ResolverUtil</a>()</pre> |
| </li> |
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| <a name="getClasses--"> |
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| <h4>getClasses</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><?>> <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.113">getClasses</a>()</pre> |
| <div class="block">Provides access to the classes discovered so far. If no calls have been made to any of the <code>find()</code> |
| methods, this set will be empty.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the set of classes that have been discovered.</dd> |
| </dl> |
| </li> |
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| <a name="getResources--"> |
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| <h4>getResources</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="class or interface in java.util">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/net/URI.html?is-external=true" title="class or interface in java.net">URI</a>> <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.122">getResources</a>()</pre> |
| <div class="block">Returns the matching resources.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A Set of URIs that match the criteria.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getClassLoader</h4> |
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| <div class="block">Returns the ClassLoader that will be used for scanning for classes. If no explicit ClassLoader has been set by |
| the calling, the context class loader will be used.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the ClassLoader that will be used to scan for classes</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setClassLoader-java.lang.ClassLoader-"> |
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| </a> |
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| <h4>setClassLoader</h4> |
| <pre>public void <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.143">setClassLoader</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/ClassLoader.html?is-external=true" title="class or interface in java.lang">ClassLoader</a> aClassloader)</pre> |
| <div class="block">Sets an explicit ClassLoader that should be used when scanning for classes. If none is set then the context |
| ClassLoader will be used.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>aClassloader</code> - a ClassLoader to use when scanning for classes</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="find-org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.Test-java.lang.String...-"> |
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| </a> |
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| <h4>find</h4> |
| <pre>public void <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.156">find</a>(<a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a> test, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>... packageNames)</pre> |
| <div class="block">Attempts to discover classes that pass the test. Accumulated classes can be accessed by calling |
| <a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#getClasses--"><code>getClasses()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>test</code> - the test to determine matching classes</dd> |
| <dd><code>packageNames</code> - one or more package names to scan (including subpackages) for classes</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>findInPackage</h4> |
| <pre>public void <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.176">findInPackage</a>(<a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a> test, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> packageName)</pre> |
| <div class="block">Scans for classes starting at the package provided and descending into subpackages. Each class is offered up to |
| the Test as it is discovered, and if the Test returns true the class is retained. Accumulated classes can be |
| fetched by calling <a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#getClasses--"><code>getClasses()</code></a>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>test</code> - an instance of <a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util"><code>ResolverUtil.Test</code></a> that will be used to filter classes</dd> |
| <dd><code>packageName</code> - the name of the package from which to start scanning for classes, e.g. <code>net.sourceforge.stripes</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="addIfMatching-org.apache.logging.log4j.core.config.plugins.util.ResolverUtil.Test-java.lang.String-"> |
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| <h4>addIfMatching</h4> |
| <pre>protected void <a href="../../../../../../../../src-html/org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.html#line.440">addIfMatching</a>(<a href="../../../../../../../../org/apache/logging/log4j/core/config/plugins/util/ResolverUtil.Test.html" title="interface in org.apache.logging.log4j.core.config.plugins.util">ResolverUtil.Test</a> test, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> fqn)</pre> |
| <div class="block">Add the class designated by the fully qualified class name provided to the set of resolved classes if and only if |
| it is approved by the Test supplied.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>test</code> - the test used to determine if the class matches</dd> |
| <dd><code>fqn</code> - the fully qualified name of a class</dd> |
| </dl> |
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