org.apache.cocoon.transformation
Class XMLDBTransformer

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.transformation.XMLDBTransformer

All Implemented Interfaces:

Poolable, Recyclable, Initializable, Component, Configurable, LogEnabled, CacheableProcessingComponent, SitemapModelComponent, Transformer, XMLPipe, XMLProducer, XMLConsumer, ContentHandler, LexicalHandler

public class XMLDBTransformer
extends AbstractTransformer
implements CacheableProcessingComponent, Configurable, Initializable

This transformer allows to perform resource creation, deletion, and XUpdate command execution in XML:DB. All operations are performed either in base collection, or context collection, which is specified as collection attribute on the query element. Context collection must be specified relative to the base collection.

Definition:

 <map:transformer name="xmldb" src="org.apache.cocoon.transformation.XMLDBTransformer">
   <!-- Optional driver parameter. Uncomment if you want transformer to register a database.
   <driver>org.apache.xindice.client.xmldb.DatabaseImpl</driver>
   -->
   <base>xmldb:xindice:///db/collection</base>
   <user>myDatabaseLogin</user>
   <password>myDatabasePassword</password>
 </map:transformer>
 

The component configuration defined in <map:transformer> can be overriden with sitemap parameters on the <map:transform>:

 <map:transform type="xmldb">
   <map:parameter name="base" value="xmldb:xindice:///db/collection"/>
   <map:parameter name="user" value="myDatabaseLogin"/>
   <map:parameter name="password" value="myDatabasePassword"/>
 </map:transform>
 

Input XML document example:

 <page xmlns:db="http://apache.org/cocoon/xmldb/1.0">
   ...
   <p>Create XML resource in base collection with specified object ID</p>
   <db:query type="create" oid="xmldb-object-id">
     <page>
       XML Object body
     </page>
   </db:query>

   <p>Delete XML resource from the base collection with specified object ID</p>
   <db:query type="delete" oid="xmldb-object-id"/>

   <p>Update XML resource with specified object ID</p>
   <db:query type="update" oid="xmldb-object-id">
     <xu:modifications version="1.0" xmlns:xu="http://www.xmldb.org/xupdate">
       <xu:remove select="/person/phone[@type = 'home']"/>
       <xu:update select="/person/phone[@type = 'work']">
         480-300-3003
       </xu:update>
       </xu:modifications>
   </db:query>

   <p>Create collection nested into the base collection</p>
   <db:query type="create" oid="inner/"/>

   <p>Create XML resource in context collection with specified object ID</p>
   <db:query type="create" collection="inner" oid="xmldb-object-id">
     <page>
       XML Object body
     </page>
   </db:query>
   ...
 </page>
 

Output XML document example:

 <page xmlns:db="http://apache.org/cocoon/xmldb/1.0">
   ...
   <db:query type="create" oid="xmldb-object-id" result="success"/>

   <db:query type="delete" oid="xmldb-object-id" result="success"/>

   <db:query type="update" oid="xmldb-object-id" result="failure">
     Resource xmldb-object-id is not found
   </db:query>
   ...
 </page>
 

Known bugs and limitations:

• No namespaces with Xalan (see AbstractTextSerializer)

Version:

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

Field Summary

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

XMLDBTransformer()

Method Summary

void	characters(char[] c, int start, int len) Receive notification of character data.
void	comment(char[] ch, int start, int len) Report an XML comment anywhere in the document.
void	configure(Configuration configuration)
void	endCDATA() Report the end of a CDATA section.
void	endDocument() Receive notification of the end of a document.
void	endDTD() Report the end of DTD declarations.
void	endElement(String uri, String loc, String raw) Receive notification of the end of an element.
void	endEntity(String name) Report the end of an entity.
void	endPrefixMapping(String prefix) End the scope of a prefix-URI mapping.
Serializable	getKey() Generate the unique key.
protected SAXTransformerFactory	getTransformerFactory() Helper for TransformerFactory.
SourceValidity	getValidity() Generate the validity object.
void	ignorableWhitespace(char[] c, int start, int len) Receive notification of ignorable whitespace in element content.
void	initialize() Initializes XML:DB database instance if driver class was configured.
void	processingInstruction(String target, String data) Receive notification of a processing instruction.
void	recycle() Recycle the producer by removing references, and resetting handlers to null (empty) implementations.
void	setup(SourceResolver resolver, Map objectModel, String src, Parameters par) Setup the transformer.
void	skippedEntity(String name) Receive notification of a skipped entity.
void	startCDATA() Report the start of a CDATA section.
void	startDocument() Receive notification of the beginning of a document.
void	startDTD(String name, String publicId, String systemId) Report the start of DTD declarations, if any.
void	startElement(String uri, String loc, String raw, Attributes a) Receive notification of the beginning of an element.
void	startEntity(String name) Report the beginning of an entity.
void	startPrefixMapping(String prefix, String uri) Begin the scope of a prefix-URI Namespace mapping.

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

setDocumentLocator

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

setDocumentLocator

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

setConsumer

Constructor Detail

XMLDBTransformer

public XMLDBTransformer()

Method Detail

configure

public void configure(Configuration configuration)
               throws ConfigurationException

Specified by:

configure in interface Configurable

Throws:

ConfigurationException

initialize

public void initialize()
                throws Exception

Initializes XML:DB database instance if driver class was configured.

Specified by:

initialize in interface Initializable

Throws:

Exception

setup

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

Setup the transformer.

Specified by:

setup in interface SitemapModelComponent

Throws:

ProcessingException

SAXException

IOException

getTransformerFactory

protected SAXTransformerFactory getTransformerFactory()

Helper for TransformerFactory.

getKey

public Serializable getKey()

Generate the unique key. This key must be unique inside the space of this component. This method must be invoked before the generateValidity() method.

Specified by:

getKey in interface CacheableProcessingComponent

Returns:

The generated key or null if the component is currently not cacheable.

getValidity

public SourceValidity getValidity()

Generate the validity object. Before this method can be invoked the generateKey() method must be invoked.

Specified by:

getValidity in interface CacheableProcessingComponent

Returns:

The generated validity object or null if the component is currently not cacheable.

startDocument

public void startDocument()
                   throws SAXException

Receive notification of the beginning of a document.

Specified by:

startDocument in interface ContentHandler

Overrides:

startDocument in class AbstractXMLPipe

Throws:

SAXException

endDocument

public void endDocument()
                 throws SAXException

Receive notification of the end of a document.

Specified by:

endDocument in interface ContentHandler

Overrides:

endDocument in class AbstractXMLPipe

Throws:

SAXException

startPrefixMapping

public void startPrefixMapping(String prefix,
                               String uri)
                        throws SAXException

Begin the scope of a prefix-URI Namespace mapping.

Specified by:

startPrefixMapping in interface ContentHandler

Overrides:

startPrefixMapping in class AbstractXMLPipe

Parameters:

prefix - The Namespace prefix being declared.

uri - The Namespace URI the prefix is mapped to.

Throws:

SAXException

endPrefixMapping

public void endPrefixMapping(String prefix)
                      throws SAXException

End the scope of a prefix-URI mapping.

Specified by:

endPrefixMapping in interface ContentHandler

Overrides:

endPrefixMapping in class AbstractXMLPipe

Parameters:

prefix - The prefix that was being mapping.

Throws:

SAXException

startElement

public void startElement(String uri,
                         String loc,
                         String raw,
                         Attributes a)
                  throws SAXException

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.

loc - 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.

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

Throws:

SAXException

endElement

public void endElement(String uri,
                       String loc,
                       String raw)
                throws SAXException

Receive notification of the end of an element.

Specified by:

endElement in interface ContentHandler

Overrides:

endElement 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.

loc - 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.

Throws:

SAXException

characters

public void characters(char[] c,
                       int start,
                       int len)
                throws SAXException

Receive notification of character data.

Specified by:

characters in interface ContentHandler

Overrides:

characters in class AbstractXMLPipe

Parameters:

c - The characters from the XML document.

start - The start position in the array.

len - The number of characters to read from the array.

Throws:

SAXException

ignorableWhitespace

public void ignorableWhitespace(char[] c,
                                int start,
                                int len)
                         throws SAXException

Receive notification of ignorable whitespace in element content.

Specified by:

ignorableWhitespace in interface ContentHandler

Overrides:

ignorableWhitespace in class AbstractXMLPipe

Parameters:

c - The characters from the XML document.

start - The start position in the array.

len - The number of characters to read from the array.

Throws:

SAXException

processingInstruction

public void processingInstruction(String target,
                                  String data)
                           throws SAXException

Receive notification of a processing instruction.

Specified by:

processingInstruction in interface ContentHandler

Overrides:

processingInstruction in class AbstractXMLPipe

Parameters:

target - The processing instruction target.

data - The processing instruction data, or null if none was supplied.

Throws:

SAXException

skippedEntity

public void skippedEntity(String name)
                   throws SAXException

Receive notification of a skipped entity.

Specified by:

skippedEntity in interface ContentHandler

Overrides:

skippedEntity in class AbstractXMLPipe

Parameters:

name - The name of the skipped entity. If it is a parameter entity, the name will begin with '%'.

Throws:

SAXException

startDTD

public void startDTD(String name,
                     String publicId,
                     String systemId)
              throws SAXException

Report the start of DTD declarations, if any.

Specified by:

startDTD in interface LexicalHandler

Overrides:

startDTD in class AbstractXMLPipe

Parameters:

name - The document type name.

publicId - The declared public identifier for the external DTD subset, or null if none was declared.

systemId - The declared system identifier for the external DTD subset, or null if none was declared.

Throws:

SAXException

endDTD

public void endDTD()
            throws SAXException

Report the end of DTD declarations.

Specified by:

endDTD in interface LexicalHandler

Overrides:

endDTD in class AbstractXMLPipe

Throws:

SAXException

startEntity

public void startEntity(String name)
                 throws SAXException

Report the beginning of an entity.

Specified by:

startEntity in interface LexicalHandler

Overrides:

startEntity in class AbstractXMLPipe

Parameters:

name - The name of the entity. If it is a parameter entity, the name will begin with '%'.

Throws:

SAXException

endEntity

public void endEntity(String name)
               throws SAXException

Report the end of an entity.

Specified by:

endEntity in interface LexicalHandler

Overrides:

endEntity in class AbstractXMLPipe

Parameters:

name - The name of the entity that is ending.

Throws:

SAXException

startCDATA

public void startCDATA()
                throws SAXException

Report the start of a CDATA section.

Specified by:

startCDATA in interface LexicalHandler

Overrides:

startCDATA in class AbstractXMLPipe

Throws:

SAXException

endCDATA

public void endCDATA()
              throws SAXException

Report the end of a CDATA section.

Specified by:

endCDATA in interface LexicalHandler

Overrides:

endCDATA in class AbstractXMLPipe

Throws:

SAXException

comment

public void comment(char[] ch,
                    int start,
                    int len)
             throws SAXException

Report an XML comment anywhere in the document.

Specified by:

comment in interface LexicalHandler

Overrides:

comment in class AbstractXMLPipe

Parameters:

ch - An array holding the characters in the comment.

start - The starting position in the array.

len - The number of characters to use from the array.

Throws:

SAXException

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