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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.binding.corba.provider.util;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
/**
* @version $Rev$ $Date$
* Utility for finding method in given class.
*/
public class MethodFinder {
private static Map<Class<?>, Class<?>> boxingMapping;
static {
boxingMapping = new HashMap<Class<?>, Class<?>>();
boxingMapping.put(boolean.class, Boolean.class);
boxingMapping.put(byte.class, Byte.class);
boxingMapping.put(short.class, Short.class);
boxingMapping.put(char.class, Character.class);
boxingMapping.put(int.class, Integer.class);
boxingMapping.put(long.class, Long.class);
boxingMapping.put(float.class, Float.class);
boxingMapping.put(double.class, Double.class);
}
/**
* Converts primitive class to its object equivalent.
*
* @param parameter class to convert
* @return object equivalent for primitive type. If parameter wasn't
* primitive then returns parameter.
*/
private static Class<?> normalizePrimitive(Class<?> parameter) {
Class<?> result = boxingMapping.get(parameter);
if (result != null) {
return result;
} else {
// not a primitive - no need to normalize
return parameter;
}
}
/**
* Finds appropriate method. This method ignores difference between
* primitive types and theirs object equivalents. Ie. if we want to find
* method "get" in java.util.List with only one parameter, which type is
* Integer then we'll obtain method get(int).
*
* @param forClass class which possibly contains desired method
* @param methodName desired methods name
* @param parameterTypes desired methods parameter types
* @return desired method, if no method was found then null will be returned
*/
public static Method findMethod(Class<?> forClass, String methodName, Class<?>[] parameterTypes) {
Method[] methods = forClass.getMethods();
for (int i = 0; i < methods.length; i++) {
if (methods[i].getName().equals(methodName)) {
Class<?>[] methodPTypes = methods[i].getParameterTypes();
if (methodPTypes.length == parameterTypes.length) {
boolean parameterMatch = true;
for (int j = 0; j < methodPTypes.length; j++) {
Class<?> nMethodPType = normalizePrimitive(methodPTypes[j]);
Class<?> nParameterType = normalizePrimitive(parameterTypes[j]);
if (!nMethodPType.equals(nParameterType)) {
parameterMatch = false;
break;
}
}
if (parameterMatch) {
return methods[i];
}
}
}
}
return null;
}
}
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