/*
* FeedRepresentation.java
*
* Created on March 27, 2007, 11:55 PM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package org.atomojo.app;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URLDecoder;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import org.atomojo.app.client.XMLRepresentationParser;
import org.atomojo.app.db.Feed;
import org.atomojo.app.db.Term;
import org.atomojo.app.db.TermInstance;
import org.infoset.xml.Element;
import org.infoset.xml.InfosetFactory;
import org.infoset.xml.ItemConstructor;
import org.infoset.xml.ItemDestination;
import org.infoset.xml.Name;
import org.infoset.xml.XMLException;
import org.infoset.xml.util.WriterItemDestination;
import org.restlet.Application;
import org.restlet.data.CharacterSet;
import org.restlet.data.MediaType;
import org.restlet.data.Reference;
import org.restlet.representation.OutputRepresentation;
import org.restlet.representation.Representation;
/**
*
* @author alex
*/
public class MetadataResource extends AtomResource {
Reference myself;
Reference feedRef;
String resourceBase;
Storage store;
App app;
/** Creates a new instance of FeedRepresentation */
public MetadataResource(Application app,Feed feed,String resourceBase,Reference myself,Reference feedRef,Storage storage) {
super(app,feed,storage);
this.myself = myself;
this.feedRef = feedRef;
this.app = new App(getContext().getLogger(),feed.getDB(),storage,theApp.getMetadataService());
}
public Representation get() {
//getContext().getLogger().info("feed: "+feed.getName()+", id: "+feed.getId()+", parent: "+feed.getParentId());
return new OutputRepresentation(MediaType.APPLICATION_ATOM) {
public void write(OutputStream os)
throws IOException
{
setCharacterSet(CharacterSet.UTF_8);
try {
generate(storage,feed,myself,feedRef,resourceBase,new WriterItemDestination(new OutputStreamWriter(os,"UTF-8"),"UTF-8"));
} catch (XMLException ex) {
getContext().getLogger().log(Level.SEVERE,"Cannot serialize metadata feed.",ex);
throw new IOException("Cannot serialize metadata feed: "+ex.getMessage());
}
}
};
}
public String getTitle()
throws IOException
{
try {
return storage.getFeedTitle(feed.getPath(),feed.getUUID());
} catch (SQLException ex) {
throw new IOException("Exception while getting feed path: "+ex.getMessage());
}
}
public static void generate(Storage storage,Feed feed,Reference metaRef,Reference feedRef,String resourceBase,ItemDestination dest)
throws XMLException
{
XMLRepresentationParser xmlParser = new XMLRepresentationParser();
ItemConstructor constructor = InfosetFactory.getDefaultInfoset().createItemConstructor();
dest.send(constructor.createDocument());
dest.send(constructor.createElement(AtomResource.FEED_NAME));
link(constructor,dest,"self",metaRef.toString());
link(constructor,dest,"related",feedRef.toString());
try {
org.atomojo.app.client.Feed feedRep = new org.atomojo.app.client.Feed(xmlParser.load(storage.getFeedHead(feed.getPath(), feed.getUUID())));
text(constructor,dest,AtomResource.TITLE_NAME,feedRep.getTitle());
String summary = feedRep.getSummary();
if (summary!=null) {
text(constructor,dest,AtomResource.SUMMARY_NAME,summary);
}
} catch (Exception ex) {
throw new XMLException("Exception while getting feed title.",ex);
}
text(constructor,dest,AtomResource.ID_NAME,feed.getUUID().toString());
text(constructor,dest,AtomResource.UPDATED_NAME,AtomResource.toXSDDate(feed.getEdited()));
try {
Iterator<TermInstance<Feed>> categorization = feed.getTerms();
while (categorization.hasNext()) {
TermInstance<Feed> category = categorization.next();
term(constructor,dest,category.getTerm().getURI(),category.getValue());
}
} catch (Exception ex) {
throw new XMLException("Exception while getting categorization.",ex);
}
try {
List<Feed> ancestors = new ArrayList<Feed>();
Feed parent = feed;
do {
parent = parent.getParent();
if (parent!=null) {
ancestors.add(parent);
}
} while (parent!=null);
Collections.reverse(ancestors);
for (Feed ancestor : ancestors) {
org.atomojo.app.client.Feed feedRep = new org.atomojo.app.client.Feed(xmlParser.load(storage.getFeedHead(ancestor.getPath(), ancestor.getUUID())));
dest.send(constructor.createElement(AtomResource.ENTRY_NAME));
text(constructor,dest,AtomResource.ID_NAME,ancestor.getUUID().toString());
text(constructor,dest,AtomResource.PUBLISHED_NAME,AtomResource.toXSDDate(ancestor.getCreated()));
text(constructor,dest,AtomResource.UPDATED_NAME,AtomResource.toXSDDate(ancestor.getEdited()));
text(constructor,dest,AtomResource.TITLE_NAME,feedRep.getTitle());
String summary = feedRep.getSummary();
if (summary!=null) {
text(constructor,dest,AtomResource.SUMMARY_NAME,summary);
}
term(constructor,dest,Categorization.ANCESTOR_TERM,null);
Iterator<TermInstance<Feed>> categorization = ancestor.getTerms();
while (categorization.hasNext()) {
TermInstance<Feed> category = categorization.next();
term(constructor,dest,category.getTerm().getURI(),category.getValue());
}
link(constructor,dest,"related",resourceBase+ancestor.getPath());
dest.send(constructor.createElementEnd(AtomResource.ENTRY_NAME));
}
} catch (Exception ex) {
throw new XMLException("Exception while getting ancestors.",ex);
}
try {
Term hidden = feed.getDB().findTerm(Categorization.HIDDEN_TYPE_TERM);
if (hidden==null) {
hidden = feed.getDB().createTerm(Categorization.HIDDEN_TYPE_TERM);
}
Iterator<Feed> children = feed.getChildren();
while (children.hasNext()) {
Feed child = children.next();
if (child.getTerm(hidden)!=null) {
continue;
}
org.atomojo.app.client.Feed feedRep = new org.atomojo.app.client.Feed(xmlParser.load(storage.getFeedHead(child.getPath(), child.getUUID())));
dest.send(constructor.createElement(AtomResource.ENTRY_NAME));
text(constructor,dest,AtomResource.ID_NAME,child.getUUID().toString());
text(constructor,dest,AtomResource.PUBLISHED_NAME,AtomResource.toXSDDate(child.getCreated()));
text(constructor,dest,AtomResource.UPDATED_NAME,AtomResource.toXSDDate(child.getEdited()));
text(constructor,dest,AtomResource.TITLE_NAME,feedRep.getTitle());
String summary = feedRep.getSummary();
if (summary!=null) {
text(constructor,dest,AtomResource.SUMMARY_NAME,summary);
}
term(constructor,dest,Categorization.CHILD_TERM,null);
Iterator<TermInstance<Feed>> categorization = child.getTerms();
while (categorization.hasNext()) {
TermInstance<Feed> category = categorization.next();
term(constructor,dest,category.getTerm().getURI(),category.getValue());
}
link(constructor,dest,"related",feedRef.toString()+child.getName()+"/");
dest.send(constructor.createElementEnd(AtomResource.ENTRY_NAME));
}
} catch (Exception ex) {
throw new XMLException("Exception while getting feed children.",ex);
}
dest.send(constructor.createElementEnd(AtomResource.FEED_NAME));
dest.send(constructor.createDocumentEnd());
}
static void text(ItemConstructor constructor,ItemDestination dest,Name name,String text)
throws XMLException
{
dest.send(constructor.createElement(name));
if (text!=null) {
dest.send(constructor.createCharacters(text));
}
dest.send(constructor.createElementEnd(name));
}
static void term(ItemConstructor constructor,ItemDestination dest,URI term,Object value)
throws XMLException
{
String [] parts = new String[2];
Term.split(term,parts);
try {
Element termE = constructor.createElement(AtomResource.CATEGORY_NAME);
if (!parts[0].equals("http://www.atomojo.org/O/keyword/")) {
termE.setAttributeValue("scheme",parts[0]);
}
termE.setAttributeValue("term",URLDecoder.decode(parts[1],"UTF-8"));
dest.send(termE);
if (value!=null && !(value instanceof Nil)) {
dest.send(constructor.createCharacters(value.toString()));
}
dest.send(constructor.createElementEnd(AtomResource.CATEGORY_NAME));
} catch (UnsupportedEncodingException ex) {
throw new XMLException("Cannot decode term "+parts[1],ex);
}
}
static void link(ItemConstructor constructor,ItemDestination dest,String rel,String href)
throws XMLException
{
Element linkE = constructor.createElement(AtomResource.LINK_NAME);
linkE.setAttributeValue("rel",rel);
linkE.setAttributeValue("href",href);
linkE.setAttributeValue("type","application/atom+xml");
dest.send(linkE);
dest.send(constructor.createElementEnd(AtomResource.LINK_NAME));
}
}