KeyTransformer.java

/*
 *
 *  * JBoss, Home of Professional Open Source.
 *  * Copyright 2011, Red Hat, Inc., and individual contributors
 *  * as indicated by the @author tags. See the copyright.txt file in the
 *  * distribution for a full listing of individual contributors.
 *  *
 *  * This is free software; you can redistribute it and/or modify it
 *  * under the terms of the GNU Lesser General Public License as
 *  * published by the Free Software Foundation; either version 2.1 of
 *  * the License, or (at your option) any later version.
 *  *
 *  * This software is distributed in the hope that it will be useful,
 *  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  * Lesser General Public License for more details.
 *  *
 *  * You should have received a copy of the GNU Lesser General Public
 *  * License along with this software; if not, write to the Free
 *  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 *  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 *
 */

package org.jboss.capedwarf.bytecode;

import javassist.CtClass;
import javassist.CtField;
import javassist.CtMethod;
import javassist.CtNewMethod;
import javassist.Modifier;
import javassist.NotFoundException;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.ClassFile;
import javassist.bytecode.ConstPool;
import javassist.bytecode.annotation.Annotation;
import javassist.bytecode.annotation.ClassMemberValue;

/**
 * @author <a href="mailto:marko.luksa@gmail.com">Marko Luksa</a>
 * @author <a href="mailto:ales.justin@jboss.org">Ales Justin</a>
 */
public class KeyTransformer extends RewriteTransformer {

    protected void transformInternal(CtClass clazz) throws Exception {
        ClassFile ccFile = clazz.getClassFile();
        ConstPool constPool = ccFile.getConstPool();
        AnnotationsAttribute attr = new AnnotationsAttribute(constPool, AnnotationsAttribute.visibleTag);

        String transformableClassName = "org.infinispan.query.Transformable";
        String gaeKeyTransformerClassName = "org.jboss.capedwarf.datastore.query.GAEKeyTransformer";

        constPool.addUtf8Info(transformableClassName);
        constPool.addUtf8Info(gaeKeyTransformerClassName);

        Annotation annotation = new Annotation(transformableClassName, constPool);
        annotation.addMemberValue("transformer", new ClassMemberValue(gaeKeyTransformerClassName, constPool));
        attr.addAnnotation(annotation);

        ccFile.addAttribute(attr);

        // boolean checked;

        CtField checked = new CtField(CtClass.booleanType, "checked", clazz);
        checked.setModifiers(Modifier.PRIVATE);
        clazz.addField(checked);

        CtMethod isChecked = CtNewMethod.make(CtClass.booleanType, "isChecked", new CtClass[0], new CtClass[0], "{return checked;}", clazz);
        clazz.addMethod(isChecked);

        CtMethod setChecked = CtNewMethod.make(CtClass.voidType, "setChecked", new CtClass[]{CtClass.booleanType}, new CtClass[0], "{checked = $1;}", clazz);
        clazz.addMethod(setChecked);
    }

    protected boolean doCheck(CtClass clazz) throws NotFoundException {
        return clazz.getDeclaredField("checked") != null;
    }
}