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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.sync;

import microsoft.exchange.webservices.data.core.EwsUtilities;

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

/**
 * Represents a collection of changes as returned by a synchronization
 * operation.
 *
 * @param  the generic type
 */
public final class ChangeCollection implements
    Iterable {

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

  /**
   * The sync state.
   */
  private String syncState;

  /**
   * The more changes available.
   */
  private boolean moreChangesAvailable;

  /**
   * Initializes a new instance of the class.
   */
  public ChangeCollection() {
  }

  /**
   * Adds the specified change.
   *
   * @param change the change
   */
  public void add(TChange change) {
    EwsUtilities.ewsAssert(change != null, "ChangeList.Add", "change is null");
    this.changes.add(change);
  }

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

  /**
   * Gets an individual change from the change collection.
   *
   * @param index the index
   * @return An single change
   */
  public TChange getChangeAtIndex(int index) {
    if (index < 0 || index >= this.getCount()) {
      throw new IndexOutOfBoundsException(
          String.format("index %d is out of range [0..%d[.", index, this.getCount()));
    }
    return this.changes.get(index);
  }

  /**
   * Gets the SyncState blob returned by a synchronization operation.
   *
   * @return the sync state
   */
  public String getSyncState() {
    return this.syncState;
  }

  /**
   * Sets the sync state.
   *
   * @param syncState the new sync state
   */
  public void setSyncState(String syncState) {
    this.syncState = syncState;
  }

  /**
   * Gets the SyncState blob returned by a synchronization operation.
   *
   * @return the more changes available
   */
  public boolean getMoreChangesAvailable() {
    return this.moreChangesAvailable;
  }

  /**
   * Sets the more changes available.
   *
   * @param moreChangesAvailable the new more changes available
   */
  public void setMoreChangesAvailable(boolean moreChangesAvailable) {
    this.moreChangesAvailable = moreChangesAvailable;
  }

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

}