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'rapiddweller Common' is an open source Java library forked from Databene Commons 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 com.rapiddweller.common.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 {

  /**
   * The Providers.
   */
  protected List> providers;

  /**
   * Instantiates a new Abstract dependent.
   *
   * @param requiredProviders the required providers
   */
  @SafeVarargs
  public AbstractDependent(E... requiredProviders) {
    this.providers = new ArrayList<>();
    for (E requiredProvider : requiredProviders) {
      addRequiredProvider(requiredProvider);
    }
  }

  /**
   * Add required provider.
   *
   * @param provider the provider
   */
  public void addRequiredProvider(E provider) {
    providers.add(new ProviderInfo<>(provider, true));
  }

  /**
   * Add optional provider.
   *
   * @param provider the provider
   */
  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();
  }

}