metadata.java

jxta_src_2.41b jxta 2.41b 最新版源码 from www.jxta.org

/*
 * Copyright (c) 2001 Sun Microsystems, Inc.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: Metadata.java,v 1.9 2005/12/09 01:11:16 bondolo Exp $
 */
package net.jxta.codat;

import java.io.IOException;

import net.jxta.peergroup.PeerGroupID;
import net.jxta.document.Document;
import net.jxta.codat.CodatID;

/**
 * Medata Codats are special codats that contain information about another
 * Codat. Multiple medata Codats can refer to the same Codat. Medata codats can
 * hold any kind of information about a codat, such as a symbolic name,
 * description, index and searching information, etc.
 *
 * @see net.jxta.codat.Codat
 * @see net.jxta.codat.CodatID
 * @see net.jxta.document.Document
 **/
public class Metadata extends Codat {
    
    /**
     *  Constructs a Metadata instance with a new CodatId given a PeerGroupID, 
     *  the CodatID of the associated Codat and a Document.
     *
     *  @param groupID The peer group to which this Codat will belong.
     *  @param about The CodatID of an associated Codat for which this Codat is
     *  metadata or <tt>null</tt> if there is no associated Codat.
     *  @param document Document which contains the content data for this Codat.
     *  @throws IOException if there is an error accessing the document.
     **/
    public Metadata(PeerGroupID groupID, CodatID about, Document document) throws IOException {
        super(groupID, about, document);
    }
    
    /**
     *  Constructs a Metadata instance for an existing Codat given it's
     *  CodatID, the CodatID of the associated Codat and a Document.
     *
     *  <p/>This implementation does not verify that the CodatID matches the
     *  provided Document.
     *
     *  @param id CodatId of the new Codat.
     *  @param about CodatID of an associated Codat for which this Codat is metadata.
     *  @param document Document which contains the content data for this Codat.
     **/
    public Metadata(CodatID id, CodatID about, Document document) {
        super(id, about, document);
    }
}