org.springsource.loaded.ri.GetDeclaredMethodLookup Maven / Gradle / Ivy
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/*
* 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.util.List;
/**
* Provides an implementation for method lookup as suitable for 'Class.getDeclaredMethod'
*
* @author Kris De Volder
* @since 0.5.0
*/
public class GetDeclaredMethodLookup {
private String name;
private String paramsDescriptor;
/*
* Create an object capable of performing the lookup in some MethodProvider
*/
public GetDeclaredMethodLookup(String name, String paramsDescriptor) {
this.name = name;
this.paramsDescriptor = paramsDescriptor;
}
public Invoker lookup(MethodProvider methodProvider) {
List methods = methodProvider.getDeclaredMethods();
Invoker found = null;
for (Invoker invoker : methods) {
if (matches(invoker)) {
if (found == null || isMoreSpecificReturnTypeThan(invoker, found)) {
found = invoker;
}
}
}
return found;
}
/*
* @return true if m2 has a more specific return type than m1
*/
private boolean isMoreSpecificReturnTypeThan(Invoker m1, Invoker m2) {
//This uses 'Class.isAssigableFrom'. This is ok, assuming that inheritance hierarchy is not something that we are allowed
// to change on reloads.
Class cls1 = m1.getReturnType();
Class cls2 = m2.getReturnType();
return cls2.isAssignableFrom(cls1);
}
protected boolean matches(Invoker invoker) {
return name.equals(invoker.getName()) && paramsDescriptor.equals(invoker.getParamsDescriptor());
}
@Override
public String toString() {
return "GetDeclaredMethod( " + name + "." + paramsDescriptor + " )";
}
}