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Viewing changes to src/org/hibernate/tool/instrument/cglib/InstrumentTask.java

  • Committer: Bazaar Package Importer
  • Author(s): Torsten Werner
  • Date: 2007-10-14 14:43:34 UTC
  • Revision ID: james.westby@ubuntu.com-20071014144334-eamc8i0q10gs1aro
Tags: upstream-3.2.5
Import upstream version 3.2.5

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src/org/hibernate/tool/instrument/cglib/InstrumentTask.java
 
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//$Id: InstrumentTask.java 10209 2006-08-03 20:35:26Z steve.ebersole@jboss.com $
 
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package org.hibernate.tool.instrument.cglib;
 
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import org.hibernate.bytecode.util.BasicClassFilter;
 
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import org.hibernate.bytecode.util.ClassDescriptor;
 
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import org.hibernate.bytecode.cglib.BytecodeProviderImpl;
 
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import org.hibernate.bytecode.ClassTransformer;
 
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import org.hibernate.tool.instrument.BasicInstrumentationTask;
 
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import org.objectweb.asm.ClassReader;
 
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import java.io.ByteArrayInputStream;
 
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import net.sf.cglib.core.ClassNameReader;
 
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import net.sf.cglib.transform.impl.InterceptFieldEnabled;
 
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/**
 
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 * An Ant task for instrumenting persistent classes in order to enable
 
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 * field-level interception using CGLIB.
 
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 * <p/>
 
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 * In order to use this task, typically you would define a a taskdef
 
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 * similiar to:<pre>
 
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 * <taskdef name="instrument" classname="org.hibernate.tool.instrument.cglib.InstrumentTask">
 
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 *     <classpath refid="lib.class.path"/>
 
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 * </taskdef>
 
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 * </pre>
 
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 * where <tt>lib.class.path</tt> is an ANT path reference containing all the
 
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 * required Hibernate and CGLIB libraries.
 
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 * <p/>
 
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 * And then use it like:<pre>
 
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 * <instrument verbose="true">
 
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 *     <fileset dir="${testclasses.dir}/org/hibernate/test">
 
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 *         <include name="yadda/yadda/**"/>
 
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 *         ...
 
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 *     </fileset>
 
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 * </instrument>
 
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 * </pre>
 
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 * where the nested ANT fileset includes the class you would like to have
 
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 * instrumented.
 
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 * <p/>
 
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 * Optionally you can chose to enable "Extended Instrumentation" if desired
 
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 * by specifying the extended attriubute on the task:<pre>
 
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 * <instrument verbose="true" extended="true">
 
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 *     ...
 
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 * </instrument>
 
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 * </pre>
 
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 * See the Hibernate manual regarding this option.
 
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 *
 
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 * @author Gavin King
 
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 * @author Steve Ebersole
 
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 */
 
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public class InstrumentTask extends BasicInstrumentationTask {
 
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        private static final BasicClassFilter CLASS_FILTER = new BasicClassFilter();
 
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        private final BytecodeProviderImpl provider = new BytecodeProviderImpl();
 
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        protected ClassDescriptor getClassDescriptor(byte[] byecode) throws Exception {
 
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                return new CustomClassDescriptor( byecode );
 
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        }
 
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        protected ClassTransformer getClassTransformer(ClassDescriptor descriptor) {
 
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                if ( descriptor.isInstrumented() ) {
 
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                        logger.verbose( "class [" + descriptor.getName() + "] already instrumented" );
 
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                        return null;
 
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                }
 
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                else {
 
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                        return provider.getTransformer( CLASS_FILTER, new CustomFieldFilter( descriptor ) );
 
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                }
 
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        }
 
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        private static class CustomClassDescriptor implements ClassDescriptor {
 
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                private final byte[] bytecode;
 
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                private final String name;
 
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                private final boolean isInstrumented;
 
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                public CustomClassDescriptor(byte[] bytecode) throws Exception {
 
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                        this.bytecode = bytecode;
 
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                        ClassReader reader = new ClassReader( new ByteArrayInputStream( bytecode ) );
 
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                        String[] names = ClassNameReader.getClassInfo( reader );
 
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                        this.name = names[0];
 
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                        boolean instrumented = false;
 
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                        for ( int i = 1; i < names.length; i++ ) {
 
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                                if ( InterceptFieldEnabled.class.getName().equals( names[i] ) ) {
 
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                                        instrumented = true;
 
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                                        break;
 
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                                }
 
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                        }
 
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                        this.isInstrumented = instrumented;
 
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                }
 
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                public String getName() {
 
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                        return name;
 
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                }
 
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                public boolean isInstrumented() {
 
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                        return isInstrumented;
 
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                }
 
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                public byte[] getBytes() {
 
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                        return bytecode;
 
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                }
 
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        }
 
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}