id.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * 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: ID.java,v 1.2 2002/06/18 20:45:59 hamada Exp $
 */

package net.jxta.impl.id.unknown;

import net.jxta.id.IDFactory;
import java.net.URL;

import java.net.MalformedURLException;

/**
 *  IDs are used to uniquely identify peers, peer groups, pipes and other
 *  types of objects manipulated by the JXTA APIs.
 *
 *  @see net.jxta.id.IDFactory
 *  @see net.jxta.codat.CodatID
 *  @see net.jxta.peer.PeerID
 *  @see net.jxta.peergroup.PeerGroupID
 *  @see net.jxta.pipe.PipeID
 *  @see net.jxta.platform.ModuleClassID
 *  @see net.jxta.platform.ModuleSpecID
 *
 *  @version     $Revision: 1.2 $
 *  @since JXTA 1.0
 **/
public class ID extends net.jxta.id.ID {
    
    String  unqiueValue;
    
    /**
     *  Constructor for IDs.
     **/
    private ID() {
    }
    
    /**
     *  Constructor for IDs.
     **/
    ID( String value ) {
        unqiueValue = value;
    }
    
    /**
     *  Returns a clone of this object. All sub-classes of ID should be immutable
     *  but we have no way to enforce it. So, let subclasses override clone with
     *  a trivial method. Here, do the standard thing (which is correct for an
     *  abstract class), so that subclasses may call super.clone() in case their
     *  clone method is NOT trivial.
     *
     *  <p/>NOTE: We DO NOT throw CloneNotSupportedException; all IDs MUST be
     *  clonable by API definition.
     *
     *  @since JXTA 1.0
     *
     *  @return the cloned object
     **/
    public Object clone() {
        return this;    // ids are invarient, we return the same as always.
    }
    
    public boolean equals( Object target ) {
        if (this == target) {
            return true;
        }
        
        // FIXME 20011220 [e-mail] very many places try to compare
        // strings against ids. For now we allow this to work.
        if (target instanceof String )
            return target.equals( this.getUniqueValue() );
        
        if (target instanceof ID )
            return getUniqueValue().toString().equals( ((ID)target).getUniqueValue().toString() );
        else
            return false;
    };
    
    public int hashCode() {
        return getUniqueValue().hashCode();
    };
    
    /**
     *  Returns a string representation of the ID. This representation should be
     *  used primarily for debugging purposes. For most other situations IDs
     *  should be externalized as Java URL Objects via {@link #getURL() getURL}.
     *  The default implementation is the toString representation of the URL
     *  representation.
     *
     *  @since JXTA 1.0
     *
     *  @return	String containing the URI
     *
     **/
    public String toString( ) {
        return getURL().toString();
    }
    
    /**
     *
     *  Returns a string identifier which indicates which ID format is
     *  used by this ID instance.
     *
     *  @since JXTA 1.0
     *
     *  @return	a string identifier which indicates which ID format is
     *  used by this ID instance.
     **/
    public String getIDFormat() {
        return unqiueValue.substring( 0, unqiueValue.indexOf('-') );
        }
    
    /**
     *
     *  Returns an object containing the unique value of the ID. This object must
     *  provide implementations of toString() and hashCode() that are canonical
     *  and consistent from run-to-run given the same input values. Beyond
     *  this nothing should be assumed about the nature of this object. For some
     *  implementations the object returned may be <code>this</code>.
     *
     *  @since JXTA 1.0
     *
     *  @return	Object which can provide canonical representations of the ID.
     **/
    public Object getUniqueValue() {
        return unqiueValue;
    }
    
    /**
     *  Returns a URI (URL in Java nomenclature) representation of the ID.
     * {@link java.net.URL URLs} are the prefered way of externalizing and
     *  presenting JXTA IDs. The {@link net.jxta.id.IDFactory JXTA ID Factory}
     *  can be used to construct ID Objects from URLs containing JXTA IDs.
     *
     *  @see java.net.URL
     *  @see net.jxta.id.IDFactory#fromURL( java.net.URL )
     *  @since JXTA 1.0
     *
     *  @return	URL Object containing the URI
     **/
    public URL getURL( ) {
        URL result = null;
        
        // Encode the unique value so that the resulting URN is valid.
        String encoded = 
            sun.net.www.protocol.urn.Handler.encodeURN( getUniqueValue().toString() );
        
        try {
            result = IDFactory.jxtaURL( net.jxta.id.ID.URIEncodingName,
            "",
            net.jxta.id.ID.URNNamespace + ":" + encoded );
        }
        catch ( java.net.MalformedURLException ignored ) {
            System.out.println( "URL Handler for '" +
            net.jxta.id.ID.URIEncodingName +
            "' not found. Check your classpath for sun.net.www.protocol." +
            net.jxta.id.ID.URIEncodingName + ".Handler" );
        }
        
        return result;
    }
}