content: package org.apache.solr.core;
  /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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.
   */
  
  import java.io.File;
  import java.io.IOException;
  
  import org.apache.lucene.store.Directory;
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.util.plugin.NamedListInitializedPlugin;
  
  /**
   * Provides access to a Directory implementation. 
   * 
   */
  public abstract class DirectoryFactory implements NamedListInitializedPlugin {
  
    /**
     * Opens a Lucene directory
     * 
     * @throws IOException
     */
    public abstract Directory open(String path) throws IOException;
    
    public boolean exists(String path) {
      // back compat behavior
      File dirFile = new File(path);
      return dirFile.canRead();
    }
  
    
    public void init(NamedList args) {
    }
  }
  