org.springsource.loaded.ri.Invoker Maven / Gradle / Ivy
/*
* Copyright 2010-2012 VMware and contributors
*
* 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.springsource.loaded.ri;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
/**
* An invoker represents the result of a method lookup operation in the type hierarchy.
*
* It encapsulates a reference to a resolved method implementation in a reloadable or non-reloadable type and provides
* an 'invoke' method suitable for invoking that method implementation, and a 'createJavaMethod' to create a Java
* {@link Method} instance that can be used to represent the method in the Java reflection API.
*
* @author Kris De Volder
* @since 0.5.0
*/
public abstract class Invoker {
private Method cachedMethod; //Cached for cases where we get call getJavaMethod multiple times.
public abstract Object invoke(Object target, Object... params) throws IllegalArgumentException,
IllegalAccessException,
InvocationTargetException;
public abstract int getModifiers();
public abstract String getName();
public abstract String getMethodDescriptor();
public String toString() {
return "Invoker(" + Modifier.toString(getModifiers()) + " " + getClassName() + "." + getName()
+ getMethodDescriptor()
+ ")";
}
public abstract String getClassName();
protected abstract Method createJavaMethod();
public String getParamsDescriptor() {
String methodDescriptor = getMethodDescriptor();
return methodDescriptor.substring(0, methodDescriptor.lastIndexOf(')') + 1);
}
public Class getReturnType() {
return getJavaMethod().getReturnType();
}
public final Method getJavaMethod() {
if (cachedMethod == null) {
cachedMethod = createJavaMethod();
}
return cachedMethod;
}
}