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org.apache.cocoon.portal.transformation
Class ProxyTransformer

java.lang.Object
  org.apache.avalon.framework.logger.AbstractLogEnabled
      org.apache.cocoon.xml.AbstractXMLProducer
          org.apache.cocoon.xml.AbstractXMLPipe
              org.apache.cocoon.transformation.AbstractTransformer
                  org.apache.cocoon.portal.transformation.ProxyTransformer

All Implemented Interfaces:

Poolable, Recyclable, Disposable, Component, LogEnabled, Parameterizable, Serviceable, SitemapModelComponent, Transformer, XMLPipe, XMLProducer, XMLConsumer, ContentHandler, LexicalHandler

public class ProxyTransformer
extends AbstractTransformer
implements Serviceable, Disposable, Parameterizable

This transformer is used to insert the XHTML data from an request to an external application at the specified element ("envelope-tag" parameter). Nesessary connection data for the external request like sessionid, cookies, documentbase, the uri, etc. will be taken from the application coplet instance data.

Version:

CVS $Id: ProxyTransformer.html 1304258 2012-03-23 10:09:27Z ilgrosso $

Author:

Friedrich Klenner, Gernot Koller

Field Summary

protected int	configuredEncoding The encoding (JTidy constant) if configured
static String	COOKIE
static String	COPLET_ID_PARAM
static String	COPLETID
protected CopletInstanceData	copletInstanceData The coplet instance data
protected String	defaultEnvelopeTag The default value for the envelope Tag
static String	DOCUMENT_BASE
protected String	documentBase The document base uri
static String	ENVELOPE_TAG_PARAMETER Parameter for specifying the envelope tag
protected String	envelopeTag This tag will include the external XHMTL
protected InputModuleHelper	imHelper Helper for resolving input modules.
protected String	link The current link to the external application
static String	LINK
protected ServiceManager	manager The Avalon component manager
protected Parameters	parameters The sitemap parameters
static String	PORTAL_NAME_PARAM
static String	PORTALNAME
static String	PROTOCOL_HANDLER_PARAMETER Parameter for specifying the java protocol handler (used for https)
static String	PROXY_PREFIX
protected Request	request The original request to the portal
static String	SESSIONTOKEN
static String	START_URI
protected String	userAgent The user agent identification string if confiugured

Fields inherited from class org.apache.cocoon.xml.AbstractXMLProducer

contentHandler, EMPTY_CONTENT_HANDLER, lexicalHandler, xmlConsumer

Fields inherited from interface org.apache.cocoon.transformation.Transformer

ROLE

Constructor Summary

ProxyTransformer()

Method Summary

protected boolean	appendParameter(StringBuffer buffer, boolean firstparameter, boolean post, String name, String value)
protected String	checkForRedirect(Document doc, String documentBase) Analyses the XHTML response document for redirects in <meta http-equiv="refresh"> elements.
protected String	checkForRedirect(HttpURLConnection connection, String documentBase) Check the http status code of the http response to detect any redirects.
protected HttpURLConnection	connect(Request request, String uri, String query, boolean post) Establish the HttpURLConnection to the given uri.
void	dispose()
static CopletInstanceData	getInstanceData(ServiceManager manager, Map objectModel, Parameters parameters) Method getInstanceData.
static CopletInstanceData	getInstanceData(ServiceManager manager, String copletID, String portalName)
void	parameterize(Parameters parameters) For the proxy transformer the envelope-tag parameter can be specified.
protected void	processRequest() Processes the request to the external application
protected Document	readXML(HttpURLConnection connection) Reads the HTML document from given connection and returns a correct W3C DOM XHTML document
void	recycle() Recycle the producer by removing references, and resetting handlers to null (empty) implementations.
static String	resolveURI(String uri, String documentBase) Resolve the possibly relative uri to an absolue uri based on given document base.
void	service(ServiceManager manager)
void	setup(SourceResolver resolver, Map objectModel, String src, Parameters parameters) Set the SourceResolver, objectModel Map, the source and sitemap Parameters used to process the request.
void	startElement(String uri, String name, String raw, Attributes attributes) Receive notification of the beginning of an element.

Methods inherited from class org.apache.cocoon.xml.AbstractXMLPipe

characters, comment, endCDATA, endDocument, endDTD, endElement, endEntity, endPrefixMapping, ignorableWhitespace, processingInstruction, setDocumentLocator, skippedEntity, startCDATA, startDocument, startDTD, startEntity, startPrefixMapping

Methods inherited from class org.apache.cocoon.xml.AbstractXMLProducer

setConsumer, setContentHandler, setLexicalHandler

Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled

enableLogging, getLogger, setupLogger, setupLogger, setupLogger

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.xml.sax.ContentHandler

characters, endDocument, endElement, endPrefixMapping, ignorableWhitespace, processingInstruction, setDocumentLocator, skippedEntity, startDocument, startPrefixMapping

Methods inherited from interface org.xml.sax.ext.LexicalHandler

comment, endCDATA, endDTD, endEntity, startCDATA, startDTD, startEntity

Methods inherited from interface org.apache.cocoon.xml.XMLProducer

setConsumer

Field Detail

ENVELOPE_TAG_PARAMETER

public static final String ENVELOPE_TAG_PARAMETER

Parameter for specifying the envelope tag

See Also:

Constant Field Values

PORTALNAME

public static final String PORTALNAME

See Also:

Constant Field Values

COPLETID

public static final String COPLETID

See Also:

Constant Field Values

PROXY_PREFIX

public static final String PROXY_PREFIX

See Also:

Constant Field Values

COPLET_ID_PARAM

public static final String COPLET_ID_PARAM

See Also:

Constant Field Values

PORTAL_NAME_PARAM

public static final String PORTAL_NAME_PARAM

See Also:

Constant Field Values

SESSIONTOKEN

public static final String SESSIONTOKEN

See Also:

Constant Field Values

COOKIE

public static final String COOKIE

See Also:

Constant Field Values

START_URI

public static final String START_URI

See Also:

Constant Field Values

LINK

public static final String LINK

See Also:

Constant Field Values

DOCUMENT_BASE

public static final String DOCUMENT_BASE

See Also:

Constant Field Values

PROTOCOL_HANDLER_PARAMETER

public static final String PROTOCOL_HANDLER_PARAMETER

Parameter for specifying the java protocol handler (used for https)

See Also:

Constant Field Values

documentBase

protected String documentBase

The document base uri

link

protected String link

The current link to the external application

defaultEnvelopeTag

protected String defaultEnvelopeTag

The default value for the envelope Tag

envelopeTag

protected String envelopeTag

This tag will include the external XHMTL

manager

protected ServiceManager manager

The Avalon component manager

copletInstanceData

protected CopletInstanceData copletInstanceData

The coplet instance data

request

protected Request request

The original request to the portal

configuredEncoding

protected int configuredEncoding

The encoding (JTidy constant) if configured

userAgent

protected String userAgent

The user agent identification string if confiugured

parameters

protected Parameters parameters

The sitemap parameters

imHelper

protected InputModuleHelper imHelper

Helper for resolving input modules.

Constructor Detail

ProxyTransformer

public ProxyTransformer()

Method Detail

service

public void service(ServiceManager manager)
             throws ServiceException

Specified by:

service in interface Serviceable

Throws:

ServiceException

See Also:

Serviceable.service(org.apache.avalon.framework.service.ServiceManager)

dispose

public void dispose()

Specified by:

dispose in interface Disposable

See Also:

Disposable.dispose()

parameterize

public void parameterize(Parameters parameters)

For the proxy transformer the envelope-tag parameter can be specified.

Specified by:

parameterize in interface Parameterizable

See Also:

Parameterizable.parameterize(Parameters)

setup

public void setup(SourceResolver resolver,
                  Map objectModel,
                  String src,
                  Parameters parameters)
           throws ProcessingException,
                  SAXException,
                  IOException

Description copied from interface: SitemapModelComponent

Set the SourceResolver, objectModel Map, the source and sitemap Parameters used to process the request.

Specified by:

setup in interface SitemapModelComponent

Throws:

ProcessingException

SAXException

IOException

See Also:

SitemapModelComponent.setup(SourceResolver, Map, String, Parameters)

recycle

public void recycle()

Description copied from class: AbstractXMLProducer

Recycle the producer by removing references, and resetting handlers to null (empty) implementations.

Specified by:

recycle in interface Recyclable

Overrides:

recycle in class AbstractXMLProducer

See Also:

Recyclable.recycle()

startElement

public void startElement(String uri,
                         String name,
                         String raw,
                         Attributes attributes)
                  throws SAXException

Description copied from class: AbstractXMLPipe

Receive notification of the beginning of an element.

Specified by:

startElement in interface ContentHandler

Overrides:

startElement in class AbstractXMLPipe

Parameters:

uri - The Namespace URI, or the empty string if the element has no Namespace URI or if Namespace processing is not being performed.

name - The local name (without prefix), or the empty string if Namespace processing is not being performed.

raw - The raw XML 1.0 name (with prefix), or the empty string if raw names are not available.

attributes - The attributes attached to the element. If there are no attributes, it shall be an empty Attributes object.

Throws:

SAXException

See Also:

ContentHandler.startElement(String, String, String, Attributes)

processRequest

protected void processRequest()
                       throws SAXException

Processes the request to the external application

Throws:

SAXException

appendParameter

protected boolean appendParameter(StringBuffer buffer,
                                  boolean firstparameter,
                                  boolean post,
                                  String name,
                                  String value)
                           throws UnsupportedEncodingException

Throws:

UnsupportedEncodingException

checkForRedirect

protected String checkForRedirect(HttpURLConnection connection,
                                  String documentBase)
                           throws IOException

Check the http status code of the http response to detect any redirects.

Parameters:

connection - The HttpURLConnection

documentBase - The current documentBase (needed for relative redirects)

Returns:

the redirected URL or null if no redirects are detected.

Throws:

IOException - if exceptions occure while analysing the response

checkForRedirect

protected String checkForRedirect(Document doc,
                                  String documentBase)
                           throws MalformedURLException

Analyses the XHTML response document for redirects in <meta http-equiv="refresh"> elements.

Parameters:

doc - The W3C DOM document containing the XHTML response

documentBase - The current document base (needed for relative redirects)

Returns:

String the redirected URL or null if no redirects are detected.

Throws:

MalformedURLException - if the redirect uri is malformed.

readXML

protected Document readXML(HttpURLConnection connection)
                    throws SAXException

Reads the HTML document from given connection and returns a correct W3C DOM XHTML document

Parameters:

connection - hte HttpURLConnection to read from

Returns:

the result as valid W3C DOM XHTML document

Throws:

SAXException

connect

protected HttpURLConnection connect(Request request,
                                    String uri,
                                    String query,
                                    boolean post)
                             throws IOException

Establish the HttpURLConnection to the given uri. User-Agent, Accept-Language and Encoding headers will be copied from the original request, if no other headers are specified.

Parameters:

request - the original request

uri - the remote uri

query - the remote query string

post - true if request method was POST

Returns:

the established HttpURLConnection

Throws:

IOException - on any exception

resolveURI

public static String resolveURI(String uri,
                                String documentBase)
                         throws MalformedURLException

Resolve the possibly relative uri to an absolue uri based on given document base.

Parameters:

uri - the uri to resolve

documentBase - the current document base

Returns:

returns an absolute URI based on document base (e.g. http://mydomain.com/some/file.html)

Throws:

MalformedURLException - if uri or document base is malformed.

getInstanceData

public static CopletInstanceData getInstanceData(ServiceManager manager,
                                                 String copletID,
                                                 String portalName)
                                          throws ProcessingException

Throws:

ProcessingException

getInstanceData

public static CopletInstanceData getInstanceData(ServiceManager manager,
                                                 Map objectModel,
                                                 Parameters parameters)
                                          throws ProcessingException

Method getInstanceData.

Parameters:

manager -

objectModel -

parameters -

Returns:

CopletInstanceData

Throws:

ProcessingException