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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.databene.commons.depend;

import java.util.ArrayList;
import java.util.List;

/**
 * Abstract class that provides partial featur implementation of the Dependent interface.
 * @param  the type of the objects to process
 * @author Volker Bergmann
 * @since 0.3.04
 */
public abstract class AbstractDependent> implements Dependent {

    protected List> providers;

    public AbstractDependent(E ... requiredProviders) {
        this.providers = new ArrayList>();
        for (E requiredProvider : requiredProviders)
            addRequiredProvider(requiredProvider);
    }
    
    public void addRequiredProvider(E provider) {
        providers.add(new ProviderInfo(provider, true));
    }

    public void addOptionalProvider(E provider) {
        providers.add(new ProviderInfo(provider, false));
    }

    // Dependent interface --------------------------------------------------------------------------
    
    @Override
	public int countProviders() {
        return providers.size();
    }

    @Override
	public E getProvider(int index) {
        return providers.get(index).getProvider();
    }

    @Override
	public boolean requiresProvider(int index) {
        return providers.get(index).isRequired();
    }

}




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