/*
 * Copyright 2014 the original author or authors.
 *
 * 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.gradle.internal.reflect;

import com.google.common.base.Equivalence;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;

import java.lang.reflect.Method;

public class MethodSignatureEquivalence extends Equivalence<Method> {

    @Override
    protected boolean doEquivalent(Method a, Method b) {
        boolean equals = new EqualsBuilder()
            .append(a.getName(), b.getName())
            .append(a.getGenericParameterTypes(), b.getGenericParameterTypes())
            .isEquals();
        if (equals) {
            equals = a.getReturnType().equals(b.getReturnType())
                || a.getReturnType().isAssignableFrom(b.getReturnType())
                || b.getReturnType().isAssignableFrom(a.getReturnType());
        }
        return equals;
    }

    @Override
    protected int doHash(Method method) {
        return new HashCodeBuilder()
            .append(method.getName())
            .append(method.getGenericParameterTypes())
            .toHashCode();
    }
}
