com.greenpepper.shaded.net.sf.cglib.proxy.MethodProxy Maven / Gradle / Ivy
/*
* Copyright 2003,2004 The Apache Software Foundation
*
* 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 net.sf.cglib.proxy;
import java.lang.reflect.*;
import java.util.Arrays;
import java.util.List;
import net.sf.cglib.core.*;
import net.sf.cglib.reflect.*;
/**
* Classes generated by {@link Enhancer} pass this object to the
* registered {@link MethodInterceptor} objects when an intercepted method is invoked. It can
* be used to either invoke the original method, or call the same method on a different
* object of the same type.
* @version $Id: MethodProxy.java,v 1.12 2004/06/24 21:15:20 herbyderby Exp $
*/
public class MethodProxy {
private Signature sig;
private String superName;
private FastClass f1;
private FastClass f2;
private int i1;
private int i2;
/**
* For internal use by {@link Enhancer} only; see the {@link net.sf.cglib.reflect.FastMethod} class
* for similar functionality.
*/
public static MethodProxy create(ClassLoader loader, Class c1, Class c2, String desc, String name1, String name2) {
final Signature sig1 = new Signature(name1, desc);
Signature sig2 = new Signature(name2, desc);
FastClass f1 = helper(loader, c1);
FastClass f2 = helper(loader, c2);
int i1 = f1.getIndex(sig1);
int i2 = f2.getIndex(sig2);
MethodProxy proxy;
if (i1 < 0) {
proxy = new MethodProxy() {
public Object invoke(Object obj, Object[] args) throws Throwable {
throw new IllegalArgumentException("Protected method: " + sig1);
}
};
} else {
proxy = new MethodProxy();
}
proxy.f1 = f1;
proxy.f2 = f2;
proxy.i1 = i1;
proxy.i2 = i2;
proxy.sig = sig1;
proxy.superName = name2;
return proxy;
}
private static FastClass helper(ClassLoader loader, Class type) {
FastClass.Generator g = new FastClass.Generator();
g.setType(type);
g.setClassLoader(loader);
AbstractClassGenerator fromEnhancer = AbstractClassGenerator.getCurrent();
if (fromEnhancer != null) {
g.setNamingPolicy(fromEnhancer.getNamingPolicy());
g.setStrategy(fromEnhancer.getStrategy());
g.setAttemptLoad(fromEnhancer.getAttemptLoad());
}
return g.create();
}
private MethodProxy() {
}
/**
* Return the signature of the proxied method.
*/
public Signature getSignature() {
return sig;
}
/**
* Return the name of the synthetic method created by CGLIB which is
* used by {@link #invokeSuper} to invoke the superclass
* (non-intercepted) method implementation. The parameter types are
* the same as the proxied method.
*/
public String getSuperName() {
return superName;
}
/**
* Return the {@link net.sf.cglib.reflect.FastClass} method index
* for the method used by {@link #invokeSuper}. This index uniquely
* identifies the method within the generated proxy, and therefore
* can be useful to reference external metadata.
* @see #getSuperName
*/
public int getSuperIndex() {
return i2;
}
/**
* Return the MethodProxy used when intercepting the method
* matching the given signature.
* @param type the class generated by Enhancer
* @param sig the signature to match
* @return the MethodProxy instance, or null if no applicable matching method is found
* @throws IllegalArgumentException if the Class was not created by Enhancer or does not use a MethodInterceptor
*/
public static MethodProxy find(Class type, Signature sig) {
try {
Method m = type.getDeclaredMethod(MethodInterceptorGenerator.FIND_PROXY_NAME,
MethodInterceptorGenerator.FIND_PROXY_TYPES);
return (MethodProxy)m.invoke(null, new Object[]{ sig });
} catch (NoSuchMethodException e) {
throw new IllegalArgumentException("Class " + type + " does not use a MethodInterceptor");
} catch (IllegalAccessException e) {
throw new CodeGenerationException(e);
} catch (InvocationTargetException e) {
throw new CodeGenerationException(e);
}
}
/**
* Invoke the original method, on a different object of the same type.
* @param obj the compatible object; recursion will result if you use the object passed as the first
* argument to the MethodInterceptor (usually not what you want)
* @param args the arguments passed to the intercepted method; you may substitute a different
* argument array as long as the types are compatible
* @see MethodInterceptor#intercept
* @throws Throwable the bare exceptions thrown by the called method are passed through
* without wrapping in an InvocationTargetException
*/
public Object invoke(Object obj, Object[] args) throws Throwable {
try {
return f1.invoke(i1, obj, args);
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
}
/**
* Invoke the original (super) method on the specified object.
* @param obj the enhanced object, must be the object passed as the first
* argument to the MethodInterceptor
* @param args the arguments passed to the intercepted method; you may substitute a different
* argument array as long as the types are compatible
* @see MethodInterceptor#intercept
* @throws Throwable the bare exceptions thrown by the called method are passed through
* without wrapping in an InvocationTargetException
*/
public Object invokeSuper(Object obj, Object[] args) throws Throwable {
try {
return f2.invoke(i2, obj, args);
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
}
}
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