/*
    * Copyright 2008 FatWire Corporation. 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 tools.gsf.facade.assetapi.asset;
  
  import com.fatwire.assetapi.data.AssetData;
  import com.fatwire.assetapi.data.AssetId;
  import tools.gsf.facade.assetapi.AssetAccessTemplate;
  import tools.gsf.facade.assetapi.AssetClosure;
  
  import java.util.Date;
  import java.util.Iterator;
  import java.util.LinkedList;
  import java.util.List;
  
  /**
   * Iterable that filters a list of assetids based on a future date. It makes use
   * of a DateFilterClosure.
   *
   * @author Dolf.Dijkstra
   * @see "DateFilterClosure"
   * @since Apr 20, 2011
   */
  public class AssetFilterIterator implements Iterable<AssetId> {
  
      final Iterable<AssetId> i;
  
      /**
       * @param aat      asset access template
       * @param assetIds collection of AssetIds
       */
      public AssetFilterIterator(final AssetAccessTemplate aat, final Iterable<AssetId> assetIds) {
          this(aat, new Date(), assetIds);
  
      }
  
      /**
       * @param aat      asset access template
       * @param date     date
       * @param assetIds collection of AssetIds
       */
  
      public AssetFilterIterator(final AssetAccessTemplate aat, final Date date, final Iterable<AssetId> assetIds) {
          super();
  
          i = date == null ? assetIds : toIterable(aat, date, assetIds);
      }
  
      private Iterable<AssetId> toIterable(final AssetAccessTemplate aat, final Date date,
                                           final Iterable<AssetId> assetIds) {
          final List<AssetId> list = new LinkedList<AssetId>();
          final AssetClosure target = new AssetClosure() {
              public boolean work(final AssetData asset) {
                  list.add(asset.getAssetId());
                  return true;
              }
          };
          final AssetClosure closure = new DateFilterClosure(date, target);
  
          aat.readAsset(assetIds, closure, "startdate", "enddate");
          return list;
      }
  
      public Iterator<AssetId> iterator() {
          return i.iterator();
      }
  }