/*
* The Sun Project JXTA(TM) Software License
*
* Copyright (c) 2001-2007 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 Sun Microsystems, Inc. for JXTA(TM) technology."
* 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.
*
* JXTA is a registered trademark of Sun Microsystems, Inc. in the United
* States and other countries.
*
* Please see the license information page at :
* <http://www.jxta.org/project/www/license.html> for instructions on use of
* the license in source files.
*
* ====================================================================
* 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.
*/
package net.jxta.impl.content.srdisocket;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Enumeration;
import java.util.logging.Level;
import java.util.logging.Logger;
import net.jxta.logging.Logging;
import net.jxta.content.ContentID;
import net.jxta.document.Document;
import net.jxta.document.Element;
import net.jxta.document.MimeMediaType;
import net.jxta.document.StructuredDocument;
import net.jxta.document.StructuredDocumentFactory;
import net.jxta.document.StructuredTextDocument;
import net.jxta.document.XMLDocument;
import net.jxta.document.XMLElement;
import net.jxta.id.IDFactory;
import net.jxta.util.LimitInputStream;
/**
* Implements a Content Response Message according to the schema:
*
* <p/><pre>
* <xs:element name="ContentResponse" type="ContentResponseType"/>
*
* <xs:complexType name="ContentResponseType">
* <xs:sequence>
* <xs:element name="ContentID" type="xs:string"
* minOccurs="1" maxoccurs="1" />
* <xs:element name="Success" type="xs:boolean"
* minOccurs="1" maxoccurs="1" />
* </xs:sequence>
* </xs:complexType>
* </pre>
*/
public class ContentResponse {
private static Logger LOG =
Logger.getLogger(ContentResponse.class.getName());
private static final String tagRoot = "ContentResponse";
private static final String tagID = "ContentID";
private static final String tagSuccess = "Success";
private ContentID id;
private boolean success;
/**
* Default constructor.
*/
public ContentResponse() {
}
/**
* Builds response object, initializing values from data found in request.
*/
public ContentResponse(ContentRequest req) {
setContentID(req.getContentID());
}
/**
* Build response object from existing XML document.
*/
public ContentResponse(Element root) {
initialize(root);
}
/**
* Process an individual element from the document during parse. Normally,
* implementations will allow the base advertisments a chance to handle the
* element before attempting ot handle the element themselves. ie.
*
* <p/><pre><code>
* protected boolean handleElement(Element elem) {
*
* if (super.handleElement()) {
* // it's been handled.
* return true;
* }
*
* <i>... handle elements here ...</i>
*
* // we don't know how to handle the element
* return false;
* }
* </code></pre>
*
* @param raw the element to be processed.
* @return true if the element was recognized, otherwise false.
**/
protected boolean handleElement(Element raw) {
XMLElement elem = (XMLElement) raw;
ContentID contentId;
URI uri;
if (elem.getName().equals(tagID)) {
try {
uri = new URI( elem.getTextValue() );
contentId = (ContentID) IDFactory.fromURI( uri );
setContentID(contentId);
} catch ( URISyntaxException badID ) {
throw new IllegalArgumentException(
"Bad Content ID in response", badID);
}
return true;
} else if (elem.getName().equals(tagSuccess)) {
setSuccess(Boolean.valueOf(elem.getTextValue()));
return true;
}
// element was not handled
return false;
}
/**
* Intialize a Content Response from a portion of a structured document.
* @param root document to intialize from
*/
protected void initialize(Element root) {
XMLElement doc = (XMLElement) root;
if(!XMLElement.class.isInstance(root)) {
throw new IllegalArgumentException(getClass().getName() +
" only supports XMLElement");
}
if (!doc.getName().equals(tagRoot)) {
throw new IllegalArgumentException(
"Could not construct : " + getClass().getName() +
"from doc containing a " + doc.getName());
}
Enumeration elements = doc.getChildren();
while (elements.hasMoreElements()) {
Element elem = (Element) elements.nextElement();
if ((!handleElement(elem))
&& Logging.SHOW_FINE && LOG.isLoggable(Level.FINE)) {
LOG.fine("Unhandled Element : " + elem.toString());
}
}
}
/**
* Read in an XML document.
*/
public Document getDocument(MimeMediaType asMimeType) {
StructuredDocument doc =
(StructuredTextDocument)
StructuredDocumentFactory.newStructuredDocument(
asMimeType, tagRoot);
Element e;
if (doc instanceof XMLDocument) {
XMLDocument xmlDoc = (XMLDocument) doc;
xmlDoc.addAttribute("xmlns:jxta", "http://jxta.org");
}
e = doc.createElement(tagID, getContentID().toString());
doc.appendChild(e);
e = doc.createElement(tagSuccess, Boolean.toString(getSuccess()));
doc.appendChild(e);
return doc;
}
/**
* Sets the Content ID of this response.
*/
public void setContentID(ContentID contentID) {
id = contentID;
}
/**
* Returns Content ID of this response.
*/
public ContentID getContentID() {
return id;
}
/**
* Sets the response status.
*/
public void setSuccess(boolean wasSuccessful) {
success = wasSuccessful;
}
/**
* Returns response status.
*/
public boolean getSuccess() {
return success;
}
/**
* Utility method to write the document to a stream with a document
* byte length prefixed to the data.
*
* @param out stream to write document to
*/
public void writeToStream(OutputStream out)
throws IOException {
ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
Document doc = getDocument(MimeMediaType.XMLUTF8);
doc.sendToStream(byteOut);
int size = byteOut.size();
out.write(size >>> 24 & 0xFF);
out.write(size >>> 16 & 0xFF);
out.write(size >>> 8 & 0xFF);
out.write(size & 0xFF);
out.write(byteOut.toByteArray());
out.flush();
}
/**
* Utility method to read a document transmitted with the corresponding
* <code>writeToStream</code> method.
*
* @param in stream to read document from
* @return response object
*/
public static ContentResponse readFromStream(InputStream in)
throws IOException {
int size = 0;
size = in.read() << 24;
size |= in.read() << 16;
size |= in.read() << 8;
size |= in.read();
LimitInputStream limitIn = new LimitInputStream(in, size);
StructuredDocument responseDoc =
StructuredDocumentFactory.newStructuredDocument(
MimeMediaType.XMLUTF8, limitIn);
return new ContentResponse(responseDoc);
}
}