/**
* The contents of this file are subject to the license and copyright
* detailed in the LICENSE and NOTICE files at the root of the source
* tree and available online at
*
* http://www.dspace.org/license/
*/
package org.dspace.app.xmlui.wing.element;
import java.util.HashMap;
import java.util.Map;
import org.dspace.app.xmlui.wing.AttributeMap;
import org.dspace.app.xmlui.wing.ObjectManager;
import org.dspace.app.xmlui.wing.WingConstants;
import org.dspace.app.xmlui.wing.WingContext;
import org.dspace.app.xmlui.wing.WingException;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
import org.xml.sax.helpers.NamespaceSupport;
/**
* A class representing a set of all referenced repositories in the DRI document.
*
* @author Scott Phillips
*/
public class RepositoryMeta extends AbstractWingElement implements WingMergeableElement, MetadataElement
{
/** The name of the ObjectMeta element */
public static final String E_REPOSITORY_META = "repositoryMeta";
/** The name of the repository element */
public static final String E_REPOSITORY = "repository";
/** The name of this repository identifier attribute*/
public static final String A_REPOSITORY_ID = "repositoryID";
/** The unique url of this repository */
public static final String A_REPOSITORY_URL = "url";
/** Has this repositoryMeta element been merged? */
private boolean merged = false;
/** The registered repositories on this page */
private Map<String,String> repositories = new HashMap<String,String>();
/**
* Construct a new RepositoryMeta
*
* @param context
* (Required) The context this element is contained in, such as
* where to route SAX events and what i18n catalogue to use.
*/
protected RepositoryMeta(WingContext context) throws WingException
{
super(context);
ObjectManager objectManager = context.getObjectManager();
if (!(objectManager == null))
{
this.repositories = objectManager.getAllManagedRepositories();
}
}
/**
* Determine if the given SAX event is a ObjectMeta element.
*
* @param namespace
* The element's name space
* @param localName
* The local, unqualified, name for this element
* @param qName
* The qualified name for this element
* @param attributes
* The element's attributes
* @return True if this WingElement is equivalent to the given SAX Event.
*/
public boolean mergeEqual(String namespace, String localName, String qName,
Attributes attributes) throws SAXException, WingException
{
if (!WingConstants.DRI.URI.equals(namespace))
{
return false;
}
if (!E_REPOSITORY_META.equals(localName))
{
return false;
}
return true;
}
/**
* Since we will only add to the object set and never modify an existing
* object we do not merge any child elements.
*
* However we will notify the object manager of each identifier we
* encounter.
*
* @param namespace
* The element's name space
* @param localName
* The local, unqualified, name for this element *
* @param qName
* The qualified name for this element
* @param attributes
* The element's attributes
* @return The child element
*/
public WingMergeableElement mergeChild(String namespace, String localName,
String qName, Attributes attributes) throws SAXException,
WingException
{
// Check if it's in our name space and an options element.
if (!WingConstants.DRI.URI.equals(namespace))
{
return null;
}
if (!E_REPOSITORY.equals(localName))
{
return null;
}
// Get the repositoryIdentefier
String repositoryIdentifier = attributes.getValue(A_REPOSITORY_ID);
if (repositories.containsKey(repositoryIdentifier))
{
repositories.remove(repositoryIdentifier);
}
return null;
}
/**
* Inform this element that it is being merged with an existing element.
*/
public Attributes merge(Attributes attributes) throws SAXException,
WingException
{
this.merged = true;
return attributes;
}
/**
* Translate this element into SAX events.
*
* @param contentHandler
* (Required) The registered contentHandler where SAX events
* should be routed too.
* @param lexicalHandler
* (Required) The registered lexicalHandler where lexical
* events (such as CDATA, DTD, etc) should be routed too.
* @param namespaces
* (Required) SAX Helper class to keep track of namespaces able
* to determine the correct prefix for a given namespace URI.
*/
public void toSAX(ContentHandler contentHandler,
LexicalHandler lexicalHandler, NamespaceSupport namespaces)
throws SAXException
{
if (!merged)
{
startElement(contentHandler, namespaces, E_REPOSITORY_META, null);
}
for (String identifier : repositories.keySet())
{
// add the repository XML
AttributeMap attributes = new AttributeMap();
attributes.put(A_REPOSITORY_ID, identifier);
attributes.put(A_REPOSITORY_URL, repositories.get(identifier));
startElement(contentHandler,namespaces,E_REPOSITORY,attributes);
endElement(contentHandler,namespaces,E_REPOSITORY);
}
if (!merged)
{
endElement(contentHandler, namespaces, E_REPOSITORY_META);
}
}
}