/*****************************************************************************
 * Copyright (c) 2009 Ken Gilmer
 * 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:
 *     Ken Gilmer - initial API and implementation
 *******************************************************************************/
package org.yocto.bc.ui.filesystem;

import java.io.File;
import java.net.URI;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;

import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.filesystem.IFileSystem;
import org.eclipse.core.filesystem.provider.FileSystem;

import org.yocto.bc.bitbake.BBSession;
import org.yocto.bc.ui.Activator;

/**
 * A filesystem that ignores specific OE directories that contain derived information.
 * @author kgilmer
 *
 */
public class OEFileSystem extends FileSystem {

	private static IFileSystem ref;
	public static IFileSystem getInstance() {
		return ref;
	}

	private Map fileStoreCache;

	public OEFileSystem() {
		ref = this;
		fileStoreCache = new Hashtable();
	}
	
	@Override
	public IFileStore getStore(URI uri) {
		
		OEFile uf = (OEFile) fileStoreCache.get(uri);
		
		if (uf == null) {
			BBSession config = null;
			try {
				config = Activator.getBBSession(uri.getPath());
				config.initialize();
			} catch (Exception e) {
				e.printStackTrace();
				return new OEIgnoreFile(new File(uri.getPath()));
			}

			if (config.get("TMPDIR") == null || config.get("DL_DIR") == null || config.get("SSTATE_DIR")== null) {
				throw new RuntimeException("Invalid local.conf: TMPDIR or DL_DIR or SSTATE_DIR undefined.");
			}
			
			List ignoreList = new ArrayList();

			//These directories are ignored because they contain too many files for Eclipse to handle efficiently.
			ignoreList.add(config.get("TMPDIR"));
			ignoreList.add(config.get("DL_DIR"));
			ignoreList.add(config.get("SSTATE_DIR"));
			
			uf = new OEFile(new File(uri.getPath()), ignoreList, uri.getPath());
			fileStoreCache.put(uri, uf);
		}
		
		return uf;
	}
}