/*
    * Copyright (C) 2011, Google Inc.
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
    *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
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   * - Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above
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   *   disclaimer in the documentation and/or other materials provided
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   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
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  package org.eclipse.jgit.internal.storage.dfs;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.text.MessageFormat;
  import java.util.Collections;
  
  import org.eclipse.jgit.attributes.AttributesNode;
  import org.eclipse.jgit.attributes.AttributesNodeProvider;
  import org.eclipse.jgit.attributes.AttributesRule;
  import org.eclipse.jgit.internal.JGitText;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.RefUpdate;
  import org.eclipse.jgit.lib.ReflogReader;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.lib.StoredConfig;
  
  /** A Git repository on a DFS. */
  public abstract class DfsRepository extends Repository {
  	private final DfsConfig config;
  
  	private final DfsRepositoryDescription description;
  
  	/**
  	 * Initialize a DFS repository.
  	 *
  	 * @param builder
  	 *            description of the repository.
  	 */
  	protected DfsRepository(DfsRepositoryBuilder builder) {
  		super(builder);
  		this.config = new DfsConfig();
  		this.description = builder.getRepositoryDescription();
  	}
  
  	@Override
  	public abstract DfsObjDatabase getObjectDatabase();
  
  	/** @return a description of this repository. */
  	public DfsRepositoryDescription getDescription() {
  		return description;
  	}
  
  	/**
  	 * Check if the repository already exists.
  	 *
  	 * @return true if the repository exists; false if it is new.
  	 * @throws IOException
  	 *             the repository cannot be checked.
  	 */
  	public boolean exists() throws IOException {
  		if (getRefDatabase() instanceof DfsRefDatabase) {
  			return ((DfsRefDatabase) getRefDatabase()).exists();
  		}
  		return true;
  	}
 
 	@Override
 	public void create(boolean bare) throws IOException {
 		if (exists())
 			throw new IOException(MessageFormat.format(
 					JGitText.get().repositoryAlreadyExists, "")); //$NON-NLS-1$
 
 		String master = Constants.R_HEADS + Constants.MASTER;
 		RefUpdate.Result result = updateRef(Constants.HEAD, true).link(master);
 		if (result != RefUpdate.Result.NEW)
 			throw new IOException(result.name());
 	}
 
 	@Override
 	public StoredConfig getConfig() {
 		return config;
 	}
 
 	@Override
 	public void scanForRepoChanges() throws IOException {
 		getRefDatabase().refresh();
 		getObjectDatabase().clearCache();
 	}
 
 	@Override
 	public void notifyIndexChanged() {
 		// Do not send notifications.
 		// There is no index, as there is no working tree.
 	}
 
 	@Override
 	public ReflogReader getReflogReader(String refName) throws IOException {
 		throw new UnsupportedOperationException();
 	}
 
 	@Override
 	public AttributesNodeProvider createAttributesNodeProvider() {
 		// TODO Check if the implementation used in FileRepository can be used
 		// for this kind of repository
 		return new EmptyAttributesNodeProvider();
 	}
 
 	private static class EmptyAttributesNodeProvider implements
 			AttributesNodeProvider {
 		private EmptyAttributesNode emptyAttributesNode = new EmptyAttributesNode();
 
 		@Override
 		public AttributesNode getInfoAttributesNode() throws IOException {
 			return emptyAttributesNode;
 		}
 
 		@Override
 		public AttributesNode getGlobalAttributesNode() throws IOException {
 			return emptyAttributesNode;
 		}
 
 		private static class EmptyAttributesNode extends AttributesNode {
 
 			public EmptyAttributesNode() {
 				super(Collections.<AttributesRule> emptyList());
 			}
 
 			@Override
 			public void parse(InputStream in) throws IOException {
 				// Do nothing
 			}
 		}
 	}
 }