/**
 * Copyright 2012 Apache Wave
 *
 * 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 org.waveprotocol.box.server.persistence.lucene;

import com.google.inject.Inject;
import com.google.inject.name.Named;

import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.waveprotocol.box.server.CoreSettings;
import org.waveprotocol.box.server.persistence.PersistenceException;
import org.waveprotocol.box.server.persistence.file.FileUtils;
import org.waveprotocol.box.server.waveserver.IndexException;

import java.io.File;
import java.io.IOException;

/**
 * File system based {@link IndexDirectory}.
 *
 * @author A. Kaplanov
 */
public class FSIndexDirectory implements IndexDirectory {

  private Directory directory;

  @Inject
  public FSIndexDirectory(@Named(CoreSettings.INDEX_DIRECTORY) String directoryName) {
    if (directory == null) {
      File file;
      try {
        file = FileUtils.createDirIfNotExists(directoryName, "");
      } catch (PersistenceException e) {
        throw new IndexException("Cannot create index directory " + directoryName, e);
      }
      try {
        directory = FSDirectory.open(file);
      } catch (IOException e) {
        throw new IndexException("Cannot open index directory " + directoryName, e);
      }
    }
  }

  @Override
  public Directory getDirectory() throws IndexException {
    return directory;
  }
}