/****************************************************************************
* Copyright (c) 2005, 2010 Jan S. Rellermeyer, Systems Group,
* Department of Computer Science, ETH Zurich and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Jan S. Rellermeyer - initial API and implementation
* Markus Alexander Kuppe - enhancements and bug fixes
*
*****************************************************************************/
package ch.ethz.iks.slp.impl;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import ch.ethz.iks.slp.ServiceLocationException;
import ch.ethz.iks.slp.ServiceURL;
/**
* a ServiceReply Message is sent as reaction to a ServiceRequest.
*
* @author Jan S. Rellermeyer, ETH Z�rich
* @since 0.1
*/
class ServiceReply extends ReplyMessage {
/**
* a List of ServiceURLs.
*/
List urlList;
/**
* create a new ServiceReply from a list of ServiceURLs.
*
* @param req
* the ServiceRequest to reply to.
* @param urls
* the result URLs.
*/
ServiceReply(final ServiceRequest req, final List urls) {
this.funcID = SRVRPLY;
this.xid = req.xid;
this.locale = req.locale;
this.address = req.address;
this.port = req.port;
this.errorCode = 0;
this.urlList = urls;
}
/**
* create a new ServiceReply from a DataInput streaming the bytes of an
* ServiceReply message body.
*
* @param input
* stream of bytes forming the message body.
* @throws ServiceLocationException
* in case that the IO caused an exception.
* @throws IOException
*/
ServiceReply(final DataInputStream input) throws ServiceLocationException,
IOException {
errorCode = input.readShort();
short entryCount = input.readShort();
urlList = new ArrayList();
for (int i = 0; i < entryCount; i++) {
urlList.add(ServiceURL.fromBytes(input));
}
if (SLPCore.CONFIG.getSecurityEnabled()) {
if (!verify())
throw new ServiceLocationException(
ServiceLocationException.AUTHENTICATION_FAILED,
toString());
}
}
/**
* get the bytes of the message body in the following RFC 2608 compliant
* format:
* <p>
*
* <pre>
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Service Location header (function = SrvRply = 2) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Error Code | URL Entry count |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | <URL Entry 1> ... <URL Entry N> \
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* </pre>
*
* </p>
*
* @return array of bytes.
* @throws ServiceLocationException
* if an IO Exception occurs.
*/
protected void writeTo(final DataOutputStream out) throws IOException {
out.writeShort(errorCode);
out.writeShort(urlList.size());
for (int i = 0; i < urlList.size(); i++) {
((ServiceURL) urlList.get(i)).writeTo(out);
}
}
/**
* get the length of the message.
*
* @return the length of the message.
* @see ch.ethz.iks.slp.impl.SLPMessage#getSize()
*/
protected int getSize() {
int len = getHeaderSize() + 2 + 2;
for (int i = 0; i < urlList.size(); i++) {
len += ((ServiceURL) urlList.get(i)).getLength();
}
return len;
}
List getResult() {
return urlList;
}
/**
* get a string representation of the AttributeReply message.
*
* @return a String displaying the properties of this message instance.
*/
public String toString() {
StringBuffer buffer = new StringBuffer();
buffer.append(super.toString());
buffer.append(", errorCode " + errorCode);
buffer.append(", URLCount " + urlList.size());
buffer.append(", URLs " + urlList);
return buffer.toString();
}
/**
* sign the ServiceReply.
*
* @param spiStr
* the SPI String.
* @throws ServiceLocationException
* in case of IO errors.
*/
void sign(final String spiStr) throws ServiceLocationException {
List spiList = stringToList(spiStr, ",");
for (Iterator urlIter = urlList.iterator(); urlIter.hasNext();) {
ServiceURL url = (ServiceURL) urlIter.next();
url.sign(spiList);
}
}
/**
* verify the ServiceReply.
*
* @return true if it could be verified.
* @throws ServiceLocationException
* in case of IO errors.
*/
boolean verify() throws ServiceLocationException {
for (Iterator urlIter = urlList.iterator(); urlIter.hasNext();) {
ServiceURL url = (ServiceURL) urlIter.next();
if (!url.verify()) {
return false;
}
}
return true;
}
}