analysis.RuntimeTemplateGenerator.java Source code

Introduction

Here is the source code for analysis.RuntimeTemplateGenerator.java

Source

/*******************************************************************************
 *     AndroidPortAssist, a Java application porting tool
 *     Copyright (C) 2016 
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program 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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package analysis;

import jar.JarClasses;
import jar.JarClasses.Entry;

import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.ClassNode;

public class RuntimeTemplateGenerator {

    public RuntimeTemplateGenerator(Collection<ClassReference> references, JarClasses javaRuntime)
            throws ClassNotFoundException {
        this.references = references;

        classes = new HashMap<String, ClassReader>();

        JarClasses.Entry entry;

        for (ClassReference ref : references) {
            if ((entry = javaRuntime.getEntry(ref.getName())) == null) {
                throw new ClassNotFoundException("Class " + ref.getName() + " not found in supplied Java runtime.");
            }

            classes.put(ref.getName(), entry.getClassReader());
        }

    }

    public JarClasses generateTemplate() {
        ClassReader classReader;
        ClassVisitor classVisitor;
        ClassWriter classWriter;

        Map<String, JarClasses.Entry> entries = new HashMap<String, JarClasses.Entry>();

        for (ClassReference ref : references) {
            classReader = classes.get(ref.getName());

            classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS);
            classVisitor = getClassTransformer(ref, classWriter);

            classReader.accept(classVisitor, ClassReader.SKIP_FRAMES);

            entries.put(ref.getName(), new JarClasses.Entry(classWriter.toByteArray(), ref.getName()));
        }

        return new JarClasses(entries);
    }

    private ClassVisitor getClassTransformer(ClassReference ref, ClassVisitor cv) {
        return new RuntimeClassTransformer(Opcodes.ASM4, cv, ref);
    }

    Collection<ClassReference> references;
    Map<String, ClassReader> classes;
}