net.enilink.composition.asm.util.MethodNodeGenerator.java Source code

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Here is the source code for net.enilink.composition.asm.util.MethodNodeGenerator.java

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/*
 * Copyright (c) 2009, 2010 Ken Wenzel
 *
 * 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 net.enilink.composition.asm.util;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.MethodNode;
import net.enilink.composition.asm.Types;

/**
 * Generator for method nodes.
 * 
 */
public class MethodNodeGenerator extends InsnListGenerator {
    public MethodNode mn;

    public MethodNodeGenerator(int access, String name, String desc) {
        this(access, name, desc, null, null);
    }

    public MethodNodeGenerator(int access, String name, String desc, String signature, String[] exceptions) {
        this(new MethodNode(access, name, desc, signature, exceptions));
    }

    public MethodNodeGenerator(MethodNode mn) {
        super(mn);
        this.mn = mn;
    }

    /**
     * Makes the given class visitor visit the generated method.
     * 
     * @param cv
     *            a class visitor.
     */
    public void accept(final ClassVisitor cv) {
        mn.accept(cv);
    }

    /**
     * Makes the given method visitor visit the generated method.
     * 
     * @param mv
     *            a method visitor.
     */
    public void accept(final MethodVisitor mv) {
        mn.accept(mv);
    }

    public void appendToStringBuilder() {
        Type type = Type.getType(StringBuilder.class);
        invokeVirtual(type, new org.objectweb.asm.commons.Method("append", type, new Type[] { Types.STRING_TYPE }));
    }

    /**
     * Calls {@link Object#toString()}.
     * 
     */
    public void invokeToString() {
        invokeVirtual(Types.OBJECT_TYPE,
                new org.objectweb.asm.commons.Method("toString", Types.STRING_TYPE, new Type[0]));
    }

    @SuppressWarnings("unchecked")
    public InsnListGenerator createSubGenerator() {
        return new InsnListGenerator(new MethodNode(mn.access, mn.name, mn.desc, mn.signature,
                (String[]) mn.exceptions.toArray(new String[mn.exceptions.size()])));
    }

    public void invoke(Constructor<?> constructor) {
        Class<?> declaringClass = constructor.getDeclaringClass();
        Type declaringType = Type.getType(declaringClass);
        org.objectweb.asm.commons.Method methodDesc = org.objectweb.asm.commons.Method.getMethod(constructor);

        invokeConstructor(declaringType, methodDesc);
    }

    public void invoke(Method method) {
        Class<?> declaringClass = method.getDeclaringClass();
        Type declaringType = Type.getType(declaringClass);
        org.objectweb.asm.commons.Method methodDesc = org.objectweb.asm.commons.Method.getMethod(method);

        if (declaringClass.isInterface()) {
            invokeInterface(declaringType, methodDesc);
        } else if (Modifier.isStatic(method.getModifiers())) {
            invokeStatic(declaringType, methodDesc);
        } else {
            invokeVirtual(declaringType, methodDesc);
        }
    }

    public void newStringBuilder() {
        Type type = Type.getType(StringBuilder.class);
        newInstance(type);
        dup();
        invokeConstructor(type, new org.objectweb.asm.commons.Method("<init>", Type.VOID_TYPE, new Type[0]));
    }
}