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/*
 * Copyright 2016 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.springlets.data.domain.jaxb;

import java.util.AbstractCollection;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

import javax.xml.bind.annotation.adapters.XmlAdapter;

/**
 * JAXB {@link XmlAdapter} to convert {@link Iterable} instances 
 * into a {@link Collection}s and vice versa.
 * 
 * @author Enrique Ruiz at http://www.disid.com[DISID Corporation S.L.]
 */
public class IterableAdapter extends XmlAdapter, Iterable> {

  @Override
  @SuppressWarnings({"unchecked", "rawtypes"})
  public AbstractCollection marshal(Iterable source) throws Exception {

    if (source == null) {
        return (AbstractCollection) Collections.emptyList();
    }

    if (source instanceof AbstractCollection) {
      return (AbstractCollection) source;
    }

    return makeCollection(source);
  }

  @Override
  public Iterable unmarshal(AbstractCollection source) throws Exception {

    if (source == null || source.isEmpty()) {
      return Collections.emptyList();
    }

    return source;
  }

  /**
   * Creates a mutable {@link ArrayList} instance containing the given elements.
   * 
   * @param source Iterable
   * @return Collection
   */
  protected AbstractCollection makeCollection(Iterable source) {

    AbstractCollection result = new ArrayList();

    for (S element : source) {
      try {
        result.add(element);
      } 
      catch (Exception o_O) {
        throw new RuntimeException(o_O);
      }
    }
    return result;
  }

}