ClassTransformer (Java EE 5 SDK)

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Java EE 5 SDK

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javax.persistence.spi Interface ClassTransformer

public interface ClassTransformer

A persistence provider supplies an instance of this interface to the PersistenceUnitInfo.addTransformer 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.

从以下版本开始:: Java Persistence 1.0

方法摘要
`byte[]`	`transform(ClassLoader loader, String className, Class<?> classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer)` Invoked when a class is being loaded or redefined.

方法详细信息

transform

byte[] transform(ClassLoader loader,
                 String className,
                 Class<?> classBeingRedefined,
                 ProtectionDomain protectionDomain,
                 byte[] classfileBuffer)
                 throws IllegalClassFormatException

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.

参数:: loader - The defining loader of the class to be transformed, may be null if the bootstrap loader; className - The name of the class in the internal form of fully qualified class and interface names; classBeingRedefined - If this is a redefine, the class being redefined, otherwise null; protectionDomain - The protection domain of the class being defined or redefined; classfileBuffer - The input byte buffer in class file format - must not be modified
返回:: A well-formed class file buffer (the result of the transform), or null if no transform is performed
抛出异常:: IllegalClassFormatException - If the input does not represent a well-formed class file

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