/*
 * The contents of this file are subject to the terms of the Common Development
 * and Distribution License (the License). You may not use this file except in
 * compliance with the License.
 *
 * You can obtain a copy of the License at http://www.netbeans.org/cddl.html
 * or http://www.netbeans.org/cddl.txt.
 * 
 * When distributing Covered Code, include this CDDL Header Notice in each file
 * and include the License file at http://www.netbeans.org/cddl.txt.
 * If applicable, add the following below the CDDL Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 *
 * The Original Software is NetBeans. The Initial Developer of the Original
 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
 * Microsystems, Inc. All Rights Reserved.
 */
package org.openide.filesystems;

import java.util.*;


/**
 * This class is intended as superclass for individual resolvers.
 * All registered subclasses of MIMEResolver are looked up and asked one by one
 * to resolve MIME type of passed FileObject. Resolving is finished right after
 * a resolver is able to resolve the FileObject or if all registered
 * resolvers returned null (not recognized).
 * <p>
 * Resolvers are registered if they have their record in the Lookup area.
 * E.g. in form : org-some-package-JavaResolver.instance file.
 *
 * @author  rmatous
 */
public abstract class MIMEResolver {
    /**
     * Resolves FileObject and returns recognized MIME type
     * @param fo is FileObject which should be resolved (This FileObject is not
     * thread safe. Also this FileObject should not be cached for later use)
     * @return  recognized MIME type or null if not recognized
     */
    public abstract String findMIMEType(FileObject fo);
}
