org.friz.bytecode.refactor.Refactorer.java Source code

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Here is the source code for org.friz.bytecode.refactor.Refactorer.java

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/**
 * Copyright (c) 2015 Kyle Friz
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.friz.bytecode.refactor;

import java.util.HashMap;
import java.util.Map;

import org.friz.bytecode.Container;
import org.friz.bytecode.element.ClassElement;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.commons.RemappingClassAdapter;
import org.objectweb.asm.tree.ClassNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Kyle Friz
 * @since Apr 6, 2015
 */
public class Refactorer {

    /**
     * The {@link Logger} instance
     */
    private static Logger logger = LoggerFactory.getLogger(Refactorer.class);

    private Container container;
    private RefactorMapper mapper;
    private Map<String, ClassMapping> sortedClasses;

    /**
     * @param container
     */
    public Refactorer(Container container) {
        this.container = container;
        this.sortedClasses = new HashMap<>();
        this.mapper = new RefactorMapper(this);
    }

    public void transform() {
        Map<String, ClassElement> refactored = new HashMap<>();
        for (ClassElement el : container().elements()) {
            String oldName = el.name();
            ClassReader cr = new ClassReader(getClassNodeBytes(el.node()));
            ClassWriter cw = new ClassWriter(cr, 0);
            RemappingClassAdapter rca = new RemappingClassAdapter(cw, mapper);
            cr.accept(rca, ClassReader.EXPAND_FRAMES);
            cr = new ClassReader(cw.toByteArray());
            ClassNode cn = new ClassNode();
            cr.accept(cn, 0);
            refactored.put(oldName, new ClassElement(cn));
        }
        for (Map.Entry<String, ClassElement> factor : refactored.entrySet()) {
            container.relocate(factor.getKey(), factor.getValue());
        }
    }

    private byte[] getClassNodeBytes(ClassNode cn) {
        ClassWriter cw = new ClassWriter(0);
        cn.accept(cw);
        byte[] b = cw.toByteArray();
        return b;
    }

    public Container container() {
        return container;
    }

    public Map<String, ClassMapping> classes() {
        return sortedClasses;
    }

    public void relocateClass(ClassElement el, String ref) {
        sortedClasses.put(el.name(), new ClassMapping(el.name(), ref));
    }
}