/*+
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 * AliasingDocuDirCache -- DocuDirCache using alias entries from config file+
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 * +
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 * Digital Image Library servlet components+
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 * +
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 * Copyright (C) 2003 Robert Casties (robcast@mail.berlios.de)+
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 * +
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 * This program is free software; you can redistribute it and/or modify it+
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 * under the terms of the GNU General Public License as published by the Free+
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 * Software Foundation; either version 2 of the License, or (at your option)+
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 * any later version.+
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 * +
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 * Please read license.txt for the full details. A copy of the GPL may be found+
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 * at http://www.gnu.org/copyleft/lgpl.html+
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 * +
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 * You should have received a copy of the GNU General Public License along with+
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 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple+
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 * Place, Suite 330, Boston, MA 02111-1307 USA+
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 * +
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 * Created on 04.11.2003+
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 */+
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+
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package digilib.io;+
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+
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import java.io.File;+
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import java.util.Iterator;+
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import java.util.Map;+
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+
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import digilib.servlet.DigilibConfiguration;+
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+
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/**+
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 * @author casties+
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 *  +
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 */+
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public class AliasingDocuDirCache extends DocuDirCache {+
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+
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	/**+
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	 * @param baseDirs+
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	 * @param fileClasses+
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	 * @param confFileName+
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	 * @throws FileOpException+
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	 */+
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	public AliasingDocuDirCache(String[] baseDirs, int[] fileClasses,+
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			File confFile, DigilibConfiguration dlConfig)+
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			throws FileOpException {+
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		// create standard DocuDirCache+
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		super(baseDirs, fileClasses, dlConfig);+
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		Map pathMap = null;+
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		// read alias config file+
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		try {+
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			// load into pathMap+
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			XMLListLoader mapLoader = new XMLListLoader("digilib-aliases",+
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					"mapping", "link", "dir");+
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			pathMap = mapLoader.loadURL(confFile.toURL().toString());+
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		} catch (Exception e) {+
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			throw new FileOpException("ERROR loading mapping file: " + e);+
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		}+
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		if (pathMap == null) {+
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			throw new FileOpException("ERROR: unable to load mapping file!");+
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		}+
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+
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		/*+
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		 * load map entries into cache+
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		 */+
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+
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		for (Iterator i = pathMap.keySet().iterator(); i.hasNext();) {+
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			String link = FileOps.normalName((String) i.next());+
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			String dir = (String) pathMap.get(link);+
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			DocuDirectory destDir = new DocuDirectory(dir, this);+
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			if (destDir.isValid()) {+
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				logger.debug("Aliasing dir: " + link);+
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				// add the alias name+
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				putName(link, destDir);+
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				// add the real dir+
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				putDir(destDir);+
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			}+
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		}+
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	}+
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+
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	/**+
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	 * Adds a DocuDirectory under another name to the cache.+
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	 * +
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	 * @param name+
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	 * @param newdir+
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	 */+
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	public void putName(String name, DocuDirectory newdir) {+
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		if (map.containsKey(name)) {+
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			logger+
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					.warn("Duplicate key in AliasingDocuDirCache.put -- ignored!");+
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		} else {+
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			map.put(name, newdir);+
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		}+
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	}+
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+
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}+
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