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• ProxyGeneratorAdapter.java

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org.codehaus.groovy.runtime.ProxyGeneratorAdapter Maven / Gradle / Ivy

/*
 * Copyright 2003-2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.runtime;

import groovy.lang.Closure;
import groovy.lang.GroovyObject;
import groovy.lang.GroovyRuntimeException;
import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.classgen.asm.BytecodeHelper;
import org.objectweb.asm.*;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.*;
import java.util.concurrent.atomic.AtomicLong;

/**
 * A proxy generator responsible for mapping a map of closures to a class implementing a list of interfaces. For
 * example, the following code:
 * 
 *     abstract class Foo {
 *         abstract void bar();
 *         abstract void baz();
 *     }
 *     def dyn = [bar: { println 'hello' }, baz: { println 'world'}] as Foo
 * 
 * will generate a proxy class which extends class Foo and delegates method calls to the provided closures.
 *
 * The generated proxy implements the {@link GroovyObject} interface.
 *
 * Additionaly, this proxy generator supports delegation to another object. In that case, if a method is defined
 * both in the closure map and the delegate, the version from the map is preferred. This allows overriding methods
 * from delegates with ease.
 *
 * Internally, the proxy generator makes use of ASM to generate bytecode, for improved performance as compared
 * to the legacy proxy generation mechanism which made use of string templates.
 *
 * @author Cedric Champeau
 *
 * @since 2.0.0
 */
public class ProxyGeneratorAdapter extends ClassVisitor implements Opcodes {
    private static final Map EMPTY_DELEGATECLOSURE_MAP = Collections.emptyMap();
    private static final Set EMPTY_STRING_SET = Collections.emptySet();

    private static final String CLOSURES_MAP_FIELD = "$closures$delegate$map";
    private static final String DELEGATE_OBJECT_FIELD = "$delegate";
    private static List OBJECT_METHODS = getInheritedMethods(Object.class, new ArrayList());
    private static List GROOVYOBJECT_METHODS = getInheritedMethods(GroovyObject.class, new ArrayList());

    private final static AtomicLong pxyCounter = new AtomicLong();
    private static final Set GROOVYOBJECT_METHOD_NAMESS;
    private static final Object[] EMPTY_ARGS = new Object[0];

    static {
        List names = new ArrayList();
        for (Method method : GroovyObject.class.getMethods()) {
            names.add(method.getName());
        }
        GROOVYOBJECT_METHOD_NAMESS = new HashSet(names);
    }

    private final Class superClass;
    private final Class delegateClass;
    private final InnerLoader loader;
    private final String proxyName;
    private final List classList;
    private final Map delegatedClosures;

    // if emptyBody == true, then we generate an empty body instead throwing error on unimplemented methods
    private final boolean emptyBody;
    private final boolean hasWildcard;
    private final boolean generateDelegateField;
    private final Set objectDelegateMethods;

    private final Set