/*
    * 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
   *   copyright notice, this list of conditions and the following
   *   disclaimer in the documentation and/or other materials provided
   *   with the distribution.
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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
   *   products derived from this software without specific prior
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   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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  package org.eclipse.jgit.internal.storage.file;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.util.List;
  
  import org.eclipse.jgit.internal.storage.pack.CachedPack;
  import org.eclipse.jgit.internal.storage.pack.ObjectToPack;
  import org.eclipse.jgit.internal.storage.pack.PackOutputStream;
  import org.eclipse.jgit.internal.storage.pack.StoredObjectRepresentation;
  
  class LocalCachedPack extends CachedPack {
  	private final ObjectDirectory odb;
  
  	private final String[] packNames;
  
  	private PackFile[] packs;
  
  	LocalCachedPack(ObjectDirectory odb, List<String> packNames) {
  		this.odb = odb;
  		this.packNames = packNames.toArray(new String[0]);
  	}
  
  	LocalCachedPack(List<PackFile> packs) {
  		odb = null;
  		packNames = null;
  		this.packs = packs.toArray(new PackFile[0]);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public long getObjectCount() throws IOException {
  		long cnt = 0;
  		for (PackFile pack : getPacks())
  			cnt += pack.getObjectCount();
  		return cnt;
  	}
  
  	void copyAsIs(PackOutputStream out, WindowCursor wc)
  			throws IOException {
  		for (PackFile pack : getPacks())
  			pack.copyPackAsIs(out, wc);
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public boolean hasObject(ObjectToPack obj, StoredObjectRepresentation rep) {
  		try {
  			LocalObjectRepresentation local = (LocalObjectRepresentation) rep;
  			for (PackFile pack : getPacks()) {
  				if (local.pack == pack)
  					return true;
  			}
  			return false;
  		} catch (FileNotFoundException packGone) {
 			return false;
 		}
 	}
 
 	private PackFile[] getPacks() throws FileNotFoundException {
 		if (packs == null) {
 			PackFile[] p = new PackFile[packNames.length];
 			for (int i = 0; i < packNames.length; i++)
 				p[i] = getPackFile(packNames[i]);
 			packs = p;
 		}
 		return packs;
 	}
 
 	private PackFile getPackFile(String packName) throws FileNotFoundException {
 		for (PackFile pack : odb.getPacks()) {
 			if (packName.equals(pack.getPackName()))
 				return pack;
 		}
 		throw new FileNotFoundException(getPackFilePath(packName));
 	}
 
 	private String getPackFilePath(String packName) {
 		final File packDir = odb.getPackDirectory();
 		return new File(packDir, "pack-" + packName + ".pack").getPath(); //$NON-NLS-1$ //$NON-NLS-2$
 	}
 }