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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
*
* 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 io.fd.honeycomb.v3po.translate.util;
import com.google.common.base.Optional;
import java.lang.reflect.Method;
import java.util.List;
import javax.annotation.Nonnull;
/**
* Reflection based utilities
*/
public final class ReflectionUtils {
private ReflectionUtils() {}
/**
* Find a specific method using reflection
*
* @param managedType Class object to find method in
* @param prefix Method name prefix used when finding the method. Case does not matter.
* @param paramTypes List of input argument types
* @param retType Return type
*
* @return Found method or Optional.absent() if there's no such method
*/
@Nonnull
public static Optional<Method> findMethodReflex(@Nonnull final Class<?> managedType,
@Nonnull final String prefix,
@Nonnull final List<Class<?>> paramTypes,
@Nonnull final Class<?> retType) {
for (Method method : managedType.getMethods()) {
if (isMethodMatch(prefix, paramTypes, retType, method)) {
return Optional.of(method);
}
}
return Optional.absent();
}
private static boolean isMethodMatch(final @Nonnull String prefix,
final @Nonnull List<Class<?>> paramTypes,
final @Nonnull Class<?> retType, final Method method) {
if (!method.getName().toLowerCase().startsWith(prefix.toLowerCase())) {
return false;
}
final Class<?>[] parameterTypes = method.getParameterTypes();
if (parameterTypes.length != paramTypes.size()) {
return false;
}
for (int i = 0; i < parameterTypes.length; i++) {
if (!parameterTypes[i].isAssignableFrom(paramTypes.get(i))) {
return false;
}
}
if (!method.getReturnType().equals(retType)) {
return false;
}
return true;
}
}
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