/*
* Copyright 2003-2007 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.metaclass;
import groovy.lang.Closure;
import groovy.lang.ClosureInvokingMethod;
import groovy.lang.MetaMethod;
import org.codehaus.groovy.reflection.CachedClass;
import org.codehaus.groovy.reflection.CachedMethod;
import org.codehaus.groovy.reflection.ReflectionCache;
import org.codehaus.groovy.runtime.GeneratedClosure;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.codehaus.groovy.runtime.MethodClosure;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
/**
* A MetaMethod that accepts a closure in the constructor which is invoked when the MetaMethod is called.
* The delegate of the closure is set to the instance that the MetaMethod is invoked on when called.
*
* @author Graeme Rocher
* @since 1.5
*/
public class ClosureMetaMethod extends MetaMethod implements ClosureInvokingMethod {
private final Closure callable;
private final CachedMethod doCall;
private final String name;
private final CachedClass declaringClass;
public ClosureMetaMethod(String name, Closure c, CachedMethod doCall) {
this(name, c.getOwner().getClass(), c, doCall);
}
public ClosureMetaMethod(String name, Class declaringClass, Closure c, CachedMethod doCall) {
super (doCall.getNativeParameterTypes());
this.name = name;
callable = c;
this.doCall = doCall;
this.declaringClass = ReflectionCache.getCachedClass(declaringClass);
}
public int getModifiers() {
return Modifier.PUBLIC;
}
public String getName() {
return name;
}
public Class getReturnType() {
return Object.class;
}
public CachedClass getDeclaringClass() {
return declaringClass;
}
public Object invoke(final Object object, Object[] arguments) {
Closure cloned = (Closure) callable.clone();
cloned.setDelegate(object);
arguments = coerceArgumentsToClasses(arguments);
return doCall.invoke(cloned, arguments);
}
/**
* Retrieves the closure that is invoked by this MetaMethod
*
* @return The closure
*/
public Closure getClosure() {
return callable;
}
public static List<MetaMethod> createMethodList(final String name, final Class declaringClass, final Closure closure) {
List<MetaMethod> res = new ArrayList<MetaMethod>();
if (closure instanceof MethodClosure) {
MethodClosure methodClosure = (MethodClosure) closure;
Object owner = closure.getOwner();
Class ownerClass = (Class) (owner instanceof Class ? owner : owner.getClass());
for (CachedMethod method : ReflectionCache.getCachedClass(ownerClass).getMethods() ) {
if (method.getName().equals(methodClosure.getMethod())) {
MetaMethod metaMethod = new MethodClosureMetaMethod(name, declaringClass, closure, method);
res.add(adjustParamTypesForStdMethods(metaMethod, name));
}
}
}
else {
if (closure instanceof GeneratedClosure) {
for (CachedMethod method : ReflectionCache.getCachedClass(closure.getClass()).getMethods() ) {
if (method.getName().equals("doCall")) {
MetaMethod metaMethod = new ClosureMetaMethod(name, declaringClass, closure, method);
res.add(adjustParamTypesForStdMethods(metaMethod, name));
}
}
}
else {
MetaMethod metaMethod = new AnonymousMetaMethod(closure, name, declaringClass);
res.add(adjustParamTypesForStdMethods(metaMethod, name));
}
}
return res;
}
private static MetaMethod adjustParamTypesForStdMethods(MetaMethod metaMethod, String methodName) {
Class[] nativeParamTypes = metaMethod.getNativeParameterTypes();
nativeParamTypes = (nativeParamTypes != null) ? nativeParamTypes : new Class[0];
// for methodMissing, first parameter should be String type - to allow overriding of this method without
// type String explicitly specified for first parameter (missing method name) - GROOVY-2951
if("methodMissing".equals(methodName) && nativeParamTypes.length == 2 && nativeParamTypes[0] != String.class) {
nativeParamTypes[0] = String.class;
}
return metaMethod;
}
public CachedMethod getDoCall() {
return doCall;
}
public static ClosureMetaMethod copy(ClosureMetaMethod closureMethod) {
if (closureMethod instanceof MethodClosureMetaMethod)
return new MethodClosureMetaMethod(closureMethod.getName(), closureMethod.getDeclaringClass().getTheClass(), closureMethod.getClosure(), closureMethod.getDoCall());
else
return new ClosureMetaMethod(closureMethod.getName(), closureMethod.getDeclaringClass().getTheClass(), closureMethod.getClosure(), closureMethod.getDoCall());
}
private static class MethodClosureMetaMethod extends ClosureMetaMethod {
public MethodClosureMetaMethod(String name, Class declaringClass, Closure closure, CachedMethod method) {
super(name, declaringClass, closure, method);
}
public Object invoke(Object object, Object[] arguments) {
return getDoCall().invoke(getClosure().getOwner(), arguments);
}
}
static class AnonymousMetaMethod extends MetaMethod {
private final Closure closure;
private final String name;
private final Class declaringClass;
public AnonymousMetaMethod(Closure closure, String name, Class declaringClass) {
super(closure.getParameterTypes());
this.closure = closure;
this.name = name;
this.declaringClass = declaringClass;
}
public int getModifiers() {
return Modifier.PUBLIC;
}
public String getName() {
return name;
}
public Class getReturnType() {
return Object.class;
}
public CachedClass getDeclaringClass() {
return ReflectionCache.getCachedClass(declaringClass);
}
public Object invoke(Object object, Object[] arguments) {
Closure cloned = (Closure) closure.clone();
cloned.setDelegate(object);
arguments = coerceArgumentsToClasses(arguments);
return InvokerHelper.invokeMethod(cloned, "call", arguments);
}
}
}