sun/slp/SAttrMsg.java

/*
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 *
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/*
 * Copyright (c) 1999 by Sun Microsystems, Inc.
 * All rights reserved.
 *
 */

//  SAttrMsg.java:    Message class for SLP attribute request.
//  Author:           James Kempf
//  Created On:       Thu Oct  9 14:24:55 1997
//  Last Modified By: James Kempf
//  Last Modified On: Tue Oct 27 10:57:41 1998
//  Update Count:     131
//

package com.sun.slp;

import java.util.*;
import java.io.*;


/**
 * The SAttrMsg class models the SLP server side attribute message.
 * Subclasses for other versions can specialize the
 * initialize() and makeReply() methods.
 *
 * @author James Kempf
 */

class SAttrMsg extends SrvLocMsgImpl {

    ServiceURL URL = null;      // nonNull if a URL query.
    String serviceType = null;  // nonNull if a service type query.
    Vector tags = new Vector(); // Vector of String tags.
    String spi = "";          // requested SPI

    protected SAttrMsg() {}

    // Construct a SAttrMsg from the input stream. This will
    //  be an SLP attribute request.

    SAttrMsg(SrvLocHeader hdr, DataInputStream dis)
    throws ServiceLocationException, IOException {

    super(hdr, SrvLocHeader.AttrRqst);

    this.initialize(dis);

    }

    // Initialize the message object.

    void initialize(DataInputStream dis)
    throws ServiceLocationException, IOException {

    SLPServerHeaderV2 hdr = (SLPServerHeaderV2)getHeader();
    StringBuffer buf = new StringBuffer();

    // Parse in the previous responder's list.

    hdr.parsePreviousRespondersIn(dis);

    // Parse in the URL or service type.

    hdr.getString(buf, dis);

    String urlOrServiceType = buf.toString();

    // Decide whether this is a service type or service URL

    try {
        URL = new ServiceURL(urlOrServiceType, ServiceURL.LIFETIME_NONE);

        serviceType = null;

    } catch (IllegalArgumentException ex) {

        // Validate and remove IANA.

        ServiceType t = new ServiceType(urlOrServiceType);

        serviceType = t.toString();

        URL = null;
    }

    // Parse in the scopes.

    hdr.parseScopesIn(dis);

    // Parse in the attribute tags.

    hdr.getString(buf, dis);

    tags = hdr.parseCommaSeparatedListIn(buf.toString(), true);

    // Unescape tags.

    hdr.unescapeTags(tags);

    // Get the SPI

    hdr.getString(buf, dis);

    spi = buf.toString();

    // Construct the description.

    hdr.constructDescription("AttrRqst",
                 "         " +
                 (URL != null ?
                    ("URL=``" + URL):
                    ("service type=``" + serviceType)) +
                 "''\n" +
                 "         tags=``" + tags + "''\n" +
                 "         spi=``" + spi + "''\n");
    }

    // Construct an SAttrMsg payload for reply to client. This will
    //  be an AttrRply message.

    SrvLocMsg makeReply(Vector attrs, Hashtable auth)
    throws ServiceLocationException {

    SLPServerHeaderV2 hdr =
        ((SLPServerHeaderV2)getHeader()).makeReplyHeader();

    hdr.iNumReplies = attrs.size();

    // Select AuthBlock with requested SPI
    if (auth != null) {
        AuthBlock selectedAuth = AuthBlock.getEquivalentAuth(spi, auth);
        auth = null;
        if (selectedAuth != null) {
        auth = new Hashtable();
        auth.put(spi, selectedAuth);
        }
    }

    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    hdr.parseAttributeVectorOut(attrs, 0, (auth != null),
                    auth, baos, true);

    hdr.payload = baos.toByteArray();

    // Construct description.

    hdr.constructDescription("AttrRply",
                 "        attributes=``" +
                 attrs +
                 "''\n" +
                 "        auth block=" +
                 AuthBlock.desc(auth) +
                 "\n");

    return hdr;

    }

}