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Exchange Web Services (EWS) Java API
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/*
 * The MIT License
 * Copyright (c) 2012 Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package microsoft.exchange.webservices.data.property.complex;

import microsoft.exchange.webservices.data.attribute.EditorBrowsable;
import microsoft.exchange.webservices.data.core.EwsServiceXmlReader;
import microsoft.exchange.webservices.data.core.EwsUtilities;
import microsoft.exchange.webservices.data.core.service.item.Item;
import microsoft.exchange.webservices.data.core.enumeration.attribute.EditorBrowsableState;
import microsoft.exchange.webservices.data.core.enumeration.misc.XmlNamespace;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceObjectPropertyException;
import microsoft.exchange.webservices.data.core.exception.service.local.ServiceVersionException;
import microsoft.exchange.webservices.data.security.XmlNodeType;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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

/**
 * Represents a collection of item.
 *
 * @param  the generic type. The type of item the collection contains.
 */
@EditorBrowsable(state = EditorBrowsableState.Never)
public final class ItemCollection extends ComplexProperty
    implements Iterable {

  private static final Log LOG = LogFactory.getLog(ItemCollection.class);

  /**
   * The item.
   */
  private List items = new ArrayList();

  /**
   * Initializes a new instance of the "ItemCollection<TItem>" class.
   */
  public ItemCollection() {
    super();
  }

  /**
   * Loads from XML.
   *
   * @param reader           The reader.
   * @param localElementName Name of the local element.
   * @throws Exception the exception
   */
  @Override public void loadFromXml(EwsServiceXmlReader reader, String localElementName) throws Exception {
    reader.ensureCurrentNodeIsStartElement(XmlNamespace.Types,
        localElementName);
    if (!reader.isEmptyElement()) {
      do {
        reader.read();

        if (reader.getNodeType().getNodeType() == XmlNodeType.START_ELEMENT) {
          TItem item = EwsUtilities
              .createEwsObjectFromXmlElementName(Item.class, reader.getService(), reader.getLocalName());

          if (item == null) {
            reader.skipCurrentElement();
          } else {
            try {
              item.loadFromXml(reader,
                  true /* clearPropertyBag */);
            } catch (ServiceObjectPropertyException e) {
              LOG.error(e);
            } catch (ServiceVersionException e) {
              LOG.error(e);
            }

            this.items.add(item);
          }
        }
      } while (!reader.isEndElement(XmlNamespace.Types,
          localElementName));
    } else {
      reader.read();
    }
  }

  /**
   * Gets the total number of item in the collection.
   *
   * @return the count
   */
  public int getCount() {
    return this.items.size();
  }

  /**
   * Gets the item at the specified index.
   *
   * @param index The zero-based index of the item to get.
   * @return The item at the specified index.
   */
  public TItem getItem(int index) {

    if (index < 0 || index >= this.getCount()) {
      throw new ArrayIndexOutOfBoundsException("index is out of range.");
    }
    return this.items.get(index);
  }

  /**
   * Gets an iterator that iterates through the elements of the collection.
   *
   * @return An Iterator for the collection.
   */
  public Iterator getIterator() {
    return this.items.iterator();
  }

  /**
   * Returns an iterator over a set of elements of type T.
   *
   * @return an Iterator.
   */
  @Override
  public Iterator iterator() {
    return this.items.iterator();
  }

}