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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual 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.jboss.weld.manager;

import java.util.Collections;

import javax.enterprise.inject.spi.Decorator;
import javax.enterprise.inject.spi.Interceptor;
import javax.enterprise.inject.spi.ObserverMethod;

import org.jboss.weld.util.Function;

public abstract class Transform implements Function> {

    Transform() {
    }

    public abstract Iterable transform(BeanManagerImpl input);

    @Override
    public Iterable apply(BeanManagerImpl input) {
        if (input == null) {
            // should never be null but makes findbugs happy
            return Collections.emptySet();
        }
        return transform(input);
    }

    static final Transform> DECORATOR = new Transform>() {
        @Override
        public Iterable> transform(BeanManagerImpl beanManager) {
            return beanManager.getDecorators();
        }
    };

    static final Transform> INTERCEPTOR = new Transform>() {
        @Override
        public Iterable> transform(BeanManagerImpl beanManager) {
            return beanManager.getInterceptors();
        }
    };

    static final Transform NAMESPACE = new Transform() {
        @Override
        public Iterable transform(BeanManagerImpl beanManager) {
            return beanManager.getNamespaces();
        }
    };

    public static final Function>> OBSERVER = new Function>>() {
        public Iterable> apply(BeanManagerImpl beanManager) {
            return beanManager.getObservers();
        }
    };
}