EntryProviderImpl.java

/*
 * Copyright (C) 2009 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.sites.liberation.util;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.collect.Lists;
import com.google.gdata.client.Query;
import com.google.gdata.client.sites.SitesService;
import com.google.gdata.data.sites.BaseContentEntry;
import com.google.gdata.data.sites.ContentFeed;
import com.google.gdata.util.ServiceException;

import java.io.IOException;
import java.util.List;

/**
 * Implements {@link EntryProvider} to provide entries for a given
 * query using a SitesService.
 * 
 * @author bsimon@google.com (Benjamin Simon)
 */
public final class EntryProviderImpl implements EntryProvider {
  
  @SuppressWarnings("unchecked")
  @Override
  public List<BaseContentEntry<?>> getEntries(Query query, 
      SitesService sitesService) throws IOException, ServiceException {
    checkNotNull(query, "query");
    checkNotNull(sitesService, "sitesService");
    List<BaseContentEntry> baseEntries = 
        sitesService.getFeed(query, ContentFeed.class).getEntries();
    List<BaseContentEntry<?>> adaptedEntries = Lists.newLinkedList();
    for (BaseContentEntry entry : baseEntries) {
      BaseContentEntry<?> adaptedEntry = 
          (BaseContentEntry<?>) entry.getAdaptedEntry();
      if (adaptedEntry == null) {
        adaptedEntries.add(entry);
      } else {
        adaptedEntries.add(adaptedEntry);
      }
    }
    return adaptedEntries;
  }
}