/* Copyright (c) 2008 Google Inc.
 *
 * 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.google.gdata.data.sites;

import com.google.gdata.util.common.xml.XmlNamespace;
import com.google.gdata.data.BaseFeed;
import com.google.gdata.data.ExtensionDescription;
import com.google.gdata.data.ExtensionProfile;
import com.google.gdata.data.Link;
import com.google.gdata.data.extensions.FeedLink;

/**
 * Describes a site feed.
 *
 * 
 */
public class SiteFeed extends BaseFeed<SiteFeed, SiteEntry> {

  /**
   * Default mutable constructor.
   */
  public SiteFeed() {
    super(SiteEntry.class);
  }

  /**
   * Constructs a new instance by doing a shallow copy of data from an existing
   * {@link BaseFeed} instance.
   *
   * @param sourceFeed source feed
   */
  public SiteFeed(BaseFeed<?, ?> sourceFeed) {
    super(SiteEntry.class, sourceFeed);
  }

  @Override
  public void declareExtensions(ExtensionProfile extProfile) {
    if (extProfile.isDeclared(SiteFeed.class)) {
      return;
    }
    super.declareExtensions(extProfile);
    extProfile.declare(SiteFeed.class, new ExtensionDescription(FeedLink.class,
        new XmlNamespace("gd", "http://schemas.google.com/g/2005"), "feedLink",
        true, false, false));
    new FeedLink().declareExtensions(extProfile);
    extProfile.declare(SiteFeed.class, SitesLink.getDefaultDescription(true,
        true));
  }

  /**
   * Returns the sites ACL feed link.
   *
   * @return sites ACL feed link
   */
  public FeedLink getFeedLink() {
    return getExtension(FeedLink.class);
  }

  /**
   * Sets the sites ACL feed link.
   *
   * @param feedLink sites ACL feed link or <code>null</code> to reset
   */
  public void setFeedLink(FeedLink feedLink) {
    if (feedLink == null) {
      removeExtension(FeedLink.class);
    } else {
      setExtension(feedLink);
    }
  }

  /**
   * Returns whether it has the sites ACL feed link.
   *
   * @return whether it has the sites ACL feed link
   */
  public boolean hasFeedLink() {
    return hasExtension(FeedLink.class);
  }

  /**
   * Returns the link that provides the URI that can be used to edit the entry.
   *
   * @return Link that provides the URI that can be used to edit the entry or
   *     {@code null} for none.
   */
  public Link getEditLink() {
    return getLink(Link.Rel.ENTRY_EDIT, Link.Type.ATOM);
  }

  @Override
  protected void validate() {
  }

  @Override
  public String toString() {
    return "{SiteFeed " + super.toString() + "}";
  }

}