FolderArchiveReader.java from BIRT at Krugle

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/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/

package org.eclipse.birt.core.archive;

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

public class FolderArchiveReader implements IDocArchiveReader
{

	private String folderName;

	/**
	 * @param folderName -
	 *            the absolute name of the folder archive
	 */
	public FolderArchiveReader( String folderName ) throws IOException
	{
		if ( folderName == null || folderName.length( ) == 0 )
			throw new IOException(
					"The folder archive name is null or empty string." );

		File fd = new File( folderName );
		if ( !fd.isDirectory( ) )
			throw new IOException(
					"The specified name is not a folder name. The FolderArchiveReader is expecting a valid folder archive name." );

		this.folderName = fd.getCanonicalPath( ); // make sure the folder name
													// is an absolute path
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.core.archive.IDocArchiveReader#getName()
	 */
	/**
	 * return the folder name as the report archive name
	 */
	public String getName( )
	{
		return folderName;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.core.archive.IDocArchiveReader#open()
	 */
	public void open( )
	{
		// Do nothing
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.core.archive.IDocArchiveReader#close()
	 */
	public void close( )
	{
		// Do nothing
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.core.archive.IDocArchiveReader#getStream(java.lang.String)
	 */
	public RAInputStream getStream( String relativePath ) throws IOException
	{
		String path = ArchiveUtil.generateFullPath( folderName, relativePath );

		File file = new File( path );
		if ( file.exists( ) )
		{
			RAFolderInputStream in = new RAFolderInputStream( file );
			return in;
		}

		return null;
	}

	public boolean exists( String relativePath )
	{
		String fullPath = ArchiveUtil.generateFullPath( folderName,
				relativePath );
		File fd = new File( fullPath );
		return fd.exists( );
	}

	/**
	 * reurun a list of strings which are the relative path of streams
	 */
	public List listStreams( String relativeStoragePath ) throws IOException
	{
		ArrayList streamList = new ArrayList( );
		String storagePath = ArchiveUtil.generateFullPath( folderName,
				relativeStoragePath );
		File dir = new File( storagePath );

		if ( dir.exists( ) && dir.isDirectory( ) )
		{
			File[] files = dir.listFiles( );
			if ( files != null )
			{
				for ( int i = 0; i < files.length; i++ )
				{
					File file = files[i];
					if ( file.isFile( ) )
					{
						String relativePath = ArchiveUtil.generateRelativePath(
								folderName, file.getPath( ) );
						if ( !FolderArchiveWriter.needSkip( relativePath ) )
						{
							streamList.add( relativePath );
						}
					}
				}
			}
		}

		return streamList;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.core.archive.IDocArchiveReader#lock(java.lang.String)
	 */
	public Object lock( String stream ) throws IOException
	{
		String path = ArchiveUtil.generateFullPath( folderName, stream + ".lck" );
		return DocArchiveLockManager.getInstance( ).lock( path );
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.core.archive.IDocArchiveReader#unlock(java.lang.Object)
	 */
	public void unlock( Object lock )
	{
		DocArchiveLockManager.getInstance( ).unlock( lock );
	}
}
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