Package com.google.livingstories.client.util

Source Code of com.google.livingstories.client.util.PageCache

/**
* Copyright 2010 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.livingstories.client.util;

import com.google.livingstories.client.FilterSpec;
import com.google.livingstories.client.lsp.views.OverviewPage;

/**
* Class that caches commonly used pages.  Currently only the Overview page is cached here,
* but we may eventually want to cache things like popular player pages, etc.
*/
public class PageCache {
  private static OverviewPage overviewPage;
 
  /**
   * Gets the current overviewPage instance, changes its filters according to
   * the specified filter parameters, and highlights the specified contentItem.
   * If the filter parameters are null, it just returns the page as-is.
   */
  public static OverviewPage getOverviewPage(FilterSpec filterParams, Long focusedContentItemId) {
    if (overviewPage == null) {
      overviewPage = new OverviewPage();
    }
    if (filterParams != null) {
      overviewPage.update(filterParams, focusedContentItemId);
    }
    return overviewPage;   
  }
}
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