/**
 * Copyright 2013 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 io.neba.core.resourcemodels.metadata;

import io.neba.api.annotations.PostMapping;
import io.neba.api.annotations.PreMapping;
import io.neba.core.util.Annotations;

import java.lang.reflect.Method;

import static io.neba.core.util.Annotations.annotations;

/**
 * Represents method meta-data extracted from a {@link io.neba.api.annotations.ResourceModel}.
 * Used to prevent the costly retrieval of this meta-data upon each resource to model mapping.
 *
 * @author Olaf Otto
 */
public class MethodMetaData {
    private final boolean isPreMappingCallback;
    private final Method method;
    private final boolean isPostMappingCallback;

    public MethodMetaData(Method method) {
        if (method == null) {
            throw new IllegalArgumentException("Constructor parameter method must not be null.");
        }
        this.method = method;
        final Annotations element  = annotations(method);
        this.isPreMappingCallback = element.contains(PreMapping.class);
        this.isPostMappingCallback = element.contains(PostMapping.class);
    }

    public boolean isPreMappingCallback() {
        return this.isPreMappingCallback;
    }

    public Method getMethod() {
        return this.method;
    }

    public boolean isPostMappingCallback() {
        return this.isPostMappingCallback;
    }

    @Override
    public int hashCode() {
        return this.method.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return obj == this ||
               (
                  obj != null && obj.getClass() == getClass() &&
                  ((MethodMetaData) obj).method.equals(this.method)
               );
    }

    @Override
    public String toString() {
        return getClass().getName() + " [" + this.method + "]";
    }
}