Package com.sun.jdo.api.persistence.enhancer

Interface ByteCodeEnhancer

  • All Known Implementing Classes:
    ByteCodeEnhancerTimer, FilterEnhancer
    public interface ByteCodeEnhancer
    A JDO enhancer, or byte-code enhancer, modifies the byte-codes of Java class files to enable transparent loading and storing of the fields of the persistent instances.

    • Method Detail

      • enhanceClassFile

        boolean enhanceClassFile​(InputStream inByteCode,
                         OutputStream outByteCode)
                  throws EnhancerUserException,
                         EnhancerFatalError
        Enhances a given class according to the JDO meta-data. If the input class has been enhanced or not - the output stream is always written, either with the enhanced class or with the non-enhanced class.
        Parameters:
        inByteCode - The byte-code of the class to be enhanced.
        outByteCode - The byte-code of the enhanced class.
        Returns:
        true if the class has been enhanced, false otherwise.
        Throws:
        EnhancerUserException
        EnhancerFatalError

      • enhanceClassFile

        boolean enhanceClassFile​(InputStream in,
                         OutputStreamWrapper out)
                  throws EnhancerUserException,
                         EnhancerFatalError
        Enhances a given class according to the JDO meta-data. If the input class has been enhanced or not - the output stream is always written, either with the enhanced class or with the non-enhanced class.
        Furthermore the enhancer has to set the classname of the enhanced class to the output stream wrapper object (it's possible to get the input stream without knowing the classname).
        Parameters:
        in - The byte-code of the class to be enhanced.
        out - The byte-code of the enhanced class.
        Returns:
        true if the class has been enhanced, false otherwise.
        Throws:
        EnhancerUserException
        EnhancerFatalError