Package org.apache.jackrabbit.commons.xml

Class Exporter

java.lang.Object

org.apache.jackrabbit.commons.xml.Exporter

Direct Known Subclasses:

DocumentViewExporter, SystemViewExporter

public abstract class Exporter
extends Object

Abstract base class for document and system view exporters. This class takes care of all the details related to namespace mappings, shareable nodes, recursive exports, binary values, and so on while leaving the decisions about what kind of SAX events to generate to subclasses.

A subclass should only need to implement the abstract methods of this class to produce a fully functional exporter.

Since:

Jackrabbit JCR Commons 1.5

Field Summary

Fields

Modifier and Type	Field	Description
protected NamespaceHelper	helper	Namespace helper.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Exporter(Session session, ContentHandler handler, boolean recurse, boolean binary)	Creates an exporter instance.

Method Summary

Modifier and Type	Method	Description
protected void	addAttribute(String uri, String local, String value)	Adds the given attribute to be included in the next element.
protected String	addNamespace(String hint, String uri)	Adds the given namespace to the export.
protected void	characters(char[] ch, int start, int length)	Emits a characters event with the given character content.
protected void	endElement(String uri, String local)	Emits the end element event for an element with the given name.
void	export(Node node)	Exports the given node by preparing the export and calling the abstract exportNode(String, String, Node) method to give control of the export format to a subclass.
protected abstract void	exportNode(String uri, String local, Node node)	Called to export the given node.
protected void	exportNodes(Node node)	Called by exportNode(String, String, Node) to recursively call exportNode(String, String, Node) for each child node.
protected void	exportProperties(Node node)	Processes all properties of the given node by calling the abstract exportProperty(String, String, Value) and exportProperty(String, String, int, Value[]) methods for each property depending on whether the property is single- or multivalued.
protected abstract void	exportProperty(String uri, String local, int type, Value[] values)	Called by exportProperties(Node) to process a multivalued property.
protected abstract void	exportProperty(String uri, String local, Value value)	Called by exportProperties(Node) to process a single-valued property.
protected String	getXMLName(String uri, String local)	Returns a prefixed XML name for the given namespace URI and local name.
protected void	startElement(String uri, String local)	Emits the start element event for an element with the given name.

Methods inherited from class java.lang.Object

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

Field Detail

helper

protected final NamespaceHelper helper

Namespace helper.

Constructor Detail

Exporter

protected Exporter(Session session,
                   ContentHandler handler,
                   boolean recurse,
                   boolean binary)

Creates an exporter instance.

Parameters:

session - current session

handler - SAX event handler

recurse - whether the export should be recursive

binary - whether the export should include binary values

Method Detail

export

public void export(Node node)
            throws RepositoryException,
                   SAXException

Exports the given node by preparing the export and calling the abstract exportNode(String, String, Node) method to give control of the export format to a subclass.

This method should be called only once for an exporter instance.

Parameters:

node - node to be exported

Throws:

SAXException - if a SAX error occurs

RepositoryException - if a repository error occurs

exportNode

protected abstract void exportNode(String uri,
                                   String local,
                                   Node node)
                            throws RepositoryException,
                                   SAXException

Called to export the given node. The node name (or jcr:root if the node is the root node) is given as an explicit pair of the resolved namespace URI and local part of the name.

The implementation of this method should call the methods exportProperties(Node) and exportProperties(Node) to respectively export the properties and child nodes of the given node. Those methods will call back to the implementations of this method and the abstract property export methods so the subclass can decide what SAX events to emit for each exported item.

Parameters:

uri - node namespace

local - node name

node - node

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

exportProperty

protected abstract void exportProperty(String uri,
                                       String local,
                                       Value value)
                                throws RepositoryException,
                                       SAXException

Called by exportProperties(Node) to process a single-valued property.

Parameters:

uri - property namespace

local - property name

value - property value

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

exportProperty

protected abstract void exportProperty(String uri,
                                       String local,
                                       int type,
                                       Value[] values)
                                throws RepositoryException,
                                       SAXException

Called by exportProperties(Node) to process a multivalued property.

Parameters:

uri - property namespace

local - property name

type - property type

values - property values

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

exportNodes

protected void exportNodes(Node node)
                    throws RepositoryException,
                           SAXException

Called by exportNode(String, String, Node) to recursively call exportNode(String, String, Node) for each child node. Does nothing if this exporter is not recursive.

Parameters:

node - parent node

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

exportProperties

protected void exportProperties(Node node)
                         throws RepositoryException,
                                SAXException

Processes all properties of the given node by calling the abstract exportProperty(String, String, Value) and exportProperty(String, String, int, Value[]) methods for each property depending on whether the property is single- or multivalued.

The first properties to be processed are jcr:primaryType, jcr:mixinTypes, and jcr:uuid, and then the remaining properties ordered by their names.

If the node is a shareable node that has already been encountered by this event generator, then only a jcr:primaryType property with the fixed value "nt:share" and the jcr:uuid property of the shareable node are exported.

Parameters:

node - node

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

See Also:

JCR-1084

characters

protected void characters(char[] ch,
                          int start,
                          int length)
                   throws SAXException

Emits a characters event with the given character content.

Parameters:

ch - character array

start - start offset within the array

length - number of characters to emit

Throws:

SAXException - if a SAX error occurs

addAttribute

protected void addAttribute(String uri,
                            String local,
                            String value)
                     throws RepositoryException

Adds the given attribute to be included in the next element.

Parameters:

uri - namespace URI of the attribute

local - local name of the attribute

value - attribute value

Throws:

RepositoryException - if a repository error occurs

startElement

protected void startElement(String uri,
                            String local)
                     throws SAXException,
                            RepositoryException

Emits the start element event for an element with the given name. All the attributes added using addAttribute(String, String, String) are included in the element along with any new namespace mappings. The namespace stack is extended for potential child elements.

Parameters:

uri - namespace URI or the element

local - local name of the element

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

endElement

protected void endElement(String uri,
                          String local)
                   throws SAXException,
                          RepositoryException

Emits the end element event for an element with the given name. The namespace stack and mappings are automatically updated.

Parameters:

uri - namespace URI or the element

local - local name of the element

Throws:

RepositoryException - if a repository error occurs

SAXException - if a SAX error occurs

getXMLName

protected String getXMLName(String uri,
                            String local)
                     throws RepositoryException

Returns a prefixed XML name for the given namespace URI and local name. If a prefix mapping for the namespace URI is not yet available, it is created based on the namespace mappings of the current JCR session.

Parameters:

uri - namespace URI

local - local name

Returns:

prefixed XML name

Throws:

RepositoryException - if a JCR namespace mapping is not available

addNamespace

protected String addNamespace(String hint,
                              String uri)

Adds the given namespace to the export. A unique prefix based on the given prefix hint is mapped to the given namespace URI. If the namespace is already mapped, then the existing prefix is returned.

Parameters:

hint - prefix hint

uri - namespace URI

Returns:

registered prefix