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| <h2 title="Interface ClassTransformer" class="title">Interface ClassTransformer</h2> |
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| <pre>public interface <span class="typeNameLabel">ClassTransformer</span></pre> |
| <div class="block">A persistence provider supplies an instance of this |
| interface to the <a href="../../../javax/persistence/spi/PersistenceUnitInfo.html#addTransformer-javax.persistence.spi.ClassTransformer-"><code>PersistenceUnitInfo.addTransformer</code></a> |
| method. The supplied transformer instance will get |
| called to transform entity class files when they are |
| loaded or redefined. The transformation occurs before |
| the class is defined by the JVM.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 1.0</dd> |
| </dl> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/persistence/spi/ClassTransformer.html#transform-java.lang.ClassLoader-java.lang.String-java.lang.Class-java.security.ProtectionDomain-byte:A-">transform</a></span>(java.lang.ClassLoader loader, |
| java.lang.String className, |
| java.lang.Class<?> classBeingRedefined, |
| java.security.ProtectionDomain protectionDomain, |
| byte[] classfileBuffer)</code> |
| <div class="block">Invoked when a class is being loaded or redefined.</div> |
| </td> |
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| <h3>Method Detail</h3> |
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| <h4>transform</h4> |
| <pre>byte[] transform(java.lang.ClassLoader loader, |
| java.lang.String className, |
| java.lang.Class<?> classBeingRedefined, |
| java.security.ProtectionDomain protectionDomain, |
| byte[] classfileBuffer) |
| throws java.lang.instrument.IllegalClassFormatException</pre> |
| <div class="block">Invoked when a class is being loaded or redefined. |
| The implementation of this method may transform the |
| supplied class file and return a new replacement class |
| file.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>loader</code> - the defining loader of the class to be |
| transformed, may be null if the bootstrap loader</dd> |
| <dd><code>className</code> - the name of the class in the internal form |
| of fully qualified class and interface names</dd> |
| <dd><code>classBeingRedefined</code> - if this is a redefine, the |
| class being redefined, otherwise null</dd> |
| <dd><code>protectionDomain</code> - the protection domain of the |
| class being defined or redefined</dd> |
| <dd><code>classfileBuffer</code> - the input byte buffer in class |
| file format - must not be modified</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a well-formed class file buffer (the result of |
| the transform), or null if no transform is performed</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.instrument.IllegalClassFormatException</code> - if the input does |
| not represent a well-formed class file</dd> |
| </dl> |
| </li> |
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