/**
* Copyright 2005-2011 Noelios Technologies.
*
* The contents of this file are subject to the terms of one of the following
* open source licenses: LGPL 3.0 or LGPL 2.1 or CDDL 1.0 or CDL 1.0 (the
* "Licenses"). You can select the license that you prefer but you may not use
* this file except in compliance with one of these Licenses.
*
* You can obtain a copy of the LGPL 3.0 license at
* http://www.opensource.org/licenses/lgpl-3.0.html
*
* You can obtain a copy of the LGPL 2.1 license at
* http://www.opensource.org/licenses/lgpl-2.1.php
*
* You can obtain a copy of the CDDL 1.0 license at
* http://www.opensource.org/licenses/cddl1.php
*
* You can obtain a copy of the EPL 1.0 license at
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the Licenses for the specific language governing permissions and
* limitations under the Licenses.
*
* Alternatively, you can obtain a royalty free commercial license with less
* limitations, transferable or non-transferable, directly at
* http://www.noelios.com/products/restlet-engine
*
* Restlet is a registered trademark of Noelios Technologies.
*/
package org.restlet.ext.atom.internal;
import java.io.StringWriter;
import java.util.Date;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.restlet.data.Language;
import org.restlet.data.MediaType;
import org.restlet.data.Reference;
import org.restlet.engine.util.DateUtils;
import org.restlet.ext.atom.Category;
import org.restlet.ext.atom.Content;
import org.restlet.ext.atom.Entry;
import org.restlet.ext.atom.EntryReader;
import org.restlet.ext.atom.Feed;
import org.restlet.ext.atom.Link;
import org.restlet.ext.atom.Person;
import org.restlet.ext.atom.Relation;
import org.restlet.ext.atom.Text;
import org.restlet.ext.xml.XmlWriter;
import org.restlet.representation.StringRepresentation;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* Content reader for entries.
*
* @author Jerome Louvel
*/
public class EntryContentReader extends EntryReader {
private enum State {
FEED_ENTRY, FEED_ENTRY_AUTHOR, FEED_ENTRY_AUTHOR_EMAIL, FEED_ENTRY_AUTHOR_NAME, FEED_ENTRY_AUTHOR_URI, FEED_ENTRY_CATEGORY, FEED_ENTRY_CONTENT, FEED_ENTRY_CONTRIBUTOR, FEED_ENTRY_ID, FEED_ENTRY_LINK, FEED_ENTRY_PUBLISHED, FEED_ENTRY_RIGHTS, FEED_ENTRY_SOURCE, FEED_ENTRY_SOURCE_AUTHOR, FEED_ENTRY_SOURCE_AUTHOR_EMAIL, FEED_ENTRY_SOURCE_AUTHOR_NAME, FEED_ENTRY_SOURCE_AUTHOR_URI, FEED_ENTRY_SOURCE_CATEGORY, FEED_ENTRY_SOURCE_CONTRIBUTOR, FEED_ENTRY_SOURCE_GENERATOR, FEED_ENTRY_SOURCE_ICON, FEED_ENTRY_SOURCE_ID, FEED_ENTRY_SOURCE_LINK, FEED_ENTRY_SOURCE_LOGO, FEED_ENTRY_SOURCE_RIGHTS, FEED_ENTRY_SOURCE_SUBTITLE, FEED_ENTRY_SOURCE_TITLE, FEED_ENTRY_SOURCE_UPDATED, FEED_ENTRY_SUMMARY, FEED_ENTRY_TITLE, FEED_ENTRY_UPDATED, NONE
}
/** Buffer for the current text content of the current tag. */
private StringBuilder contentBuffer;
/** The media type of the Content (for inline cases). */
private MediaType contentType;
/** Mark the Content depth. */
private int contentDepth;
/** The currently parsed Category. */
private Category currentCategory;
/** The currently parsed Content. */
private Content currentContent;
/** The currently parsed XML content writer. */
private XmlWriter currentContentWriter;
/** The currently date parsed from the current text content. */
private Date currentDate;
/** The currently parsed Entry. */
private Entry currentEntry;
/** The currently parsed Link. */
private Link currentLink;
/** The currently parsed Person. */
private Person currentPerson;
/** The currently parsed Text. */
private Text currentText;
/** The current list of prefix mappings. */
private Map<String, String> prefixMappings;
/** The currently state. */
private EntryContentReader.State state;
/**
* Constructor.
*
* @param entry
* The entry object to update during the parsing.
*/
public EntryContentReader(Entry entry) {
this(entry, null);
}
/**
* Constructor.
*
* @param entry
* The entry object to update during the parsing.
* @param extraEntryHandler
* Custom handler of all events.
*/
public EntryContentReader(Entry entry, EntryReader extraEntryHandler) {
super(extraEntryHandler);
this.state = State.NONE;
this.contentDepth = -1;
this.currentEntry = entry;
this.currentText = null;
this.currentDate = null;
this.currentLink = null;
this.currentPerson = null;
this.contentBuffer = null;
this.currentCategory = null;
this.currentContent = null;
this.prefixMappings = new ConcurrentHashMap<String, String>();
}
@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
if (this.contentDepth >= 0) {
// The content might embed XML elements from various namespaces
if (this.currentContentWriter != null) {
this.currentContentWriter.characters(ch, start, length);
}
} else {
this.contentBuffer.append(ch, start, length);
}
super.characters(ch, start, length);
}
@Override
public void endDocument() throws SAXException {
this.state = State.NONE;
this.contentBuffer = null;
super.endDocument();
}
@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (this.currentText != null) {
this.currentText.setContent(this.contentBuffer.toString());
}
if (this.currentDate != null) {
final String formattedDate = this.contentBuffer.toString();
final Date parsedDate = DateUtils.parse(formattedDate.trim(),
DateUtils.FORMAT_RFC_3339);
if (parsedDate != null) {
this.currentDate.setTime(parsedDate.getTime());
} else {
this.currentDate = null;
}
}
if (contentDepth > 0) {
// The content might embed XML elements from various namespaces
if (this.currentContentWriter != null) {
this.currentContentWriter.endElement(uri, localName, qName);
}
contentDepth--;
} else if (uri.equalsIgnoreCase(Feed.ATOM_NAMESPACE)) {
if (localName.equals("feed")) {
this.state = State.NONE;
} else if (localName.equals("title")) {
if (this.state == State.FEED_ENTRY_TITLE) {
this.currentEntry.setTitle(this.currentText);
this.state = State.FEED_ENTRY;
} else if (this.state == State.FEED_ENTRY_SOURCE_TITLE) {
this.currentEntry.getSource().setTitle(this.currentText);
this.state = State.FEED_ENTRY_SOURCE;
}
} else if (localName.equals("updated")) {
if (this.state == State.FEED_ENTRY_UPDATED) {
this.currentEntry.setUpdated(this.currentDate);
this.state = State.FEED_ENTRY;
} else if (this.state == State.FEED_ENTRY_SOURCE_UPDATED) {
this.currentEntry.getSource().setUpdated(this.currentDate);
this.state = State.FEED_ENTRY_SOURCE;
}
} else if (localName.equals("published")) {
if (this.state == State.FEED_ENTRY_PUBLISHED) {
this.currentEntry.setPublished(this.currentDate);
this.state = State.FEED_ENTRY;
}
} else if (localName.equals("author")) {
if (this.state == State.FEED_ENTRY_AUTHOR) {
this.currentEntry.getAuthors().add(this.currentPerson);
this.state = State.FEED_ENTRY;
} else if (this.state == State.FEED_ENTRY_SOURCE_AUTHOR) {
this.currentEntry.getSource().getAuthors().add(
this.currentPerson);
this.state = State.FEED_ENTRY_SOURCE;
}
} else if (localName.equals("name")) {
this.currentPerson.setName(this.contentBuffer.toString());
if (this.state == State.FEED_ENTRY_AUTHOR_NAME) {
this.state = State.FEED_ENTRY_AUTHOR;
} else if (this.state == State.FEED_ENTRY_SOURCE_AUTHOR_NAME) {
this.state = State.FEED_ENTRY_SOURCE_AUTHOR;
}
} else if (localName.equals("id")) {
if (this.state == State.FEED_ENTRY_ID) {
this.currentEntry.setId(this.contentBuffer.toString());
this.state = State.FEED_ENTRY;
} else if (this.state == State.FEED_ENTRY_SOURCE_ID) {
this.currentEntry.getSource().setId(
this.contentBuffer.toString());
this.state = State.FEED_ENTRY_SOURCE;
}
} else if (localName.equals("link")) {
if (this.state == State.FEED_ENTRY_LINK) {
this.currentEntry.getLinks().add(this.currentLink);
this.state = State.FEED_ENTRY;
} else if (this.state == State.FEED_ENTRY_SOURCE_LINK) {
this.currentEntry.getSource().getLinks().add(
this.currentLink);
this.state = State.FEED_ENTRY_SOURCE;
}
// Set the inline content, if any
if (this.currentContentWriter != null) {
String content = this.currentContentWriter.getWriter()
.toString().trim();
contentDepth = -1;
if ("".equals(content)) {
this.currentLink.setContent(null);
} else {
if (this.currentLink.getType() != null) {
currentContent
.setInlineContent(new StringRepresentation(
content, this.currentLink.getType()));
} else {
currentContent
.setInlineContent(new StringRepresentation(
content, contentType));
}
}
this.currentContentWriter = null;
}
endLink(this.currentLink);
} else if (localName.equalsIgnoreCase("entry")) {
this.state = State.NONE;
endEntry(this.currentEntry);
} else if (localName.equals("category")) {
if (this.state == State.FEED_ENTRY_CATEGORY) {
this.currentEntry.getCategories().add(this.currentCategory);
this.state = State.FEED_ENTRY;
} else if (this.state == State.FEED_ENTRY_SOURCE_CATEGORY) {
this.currentEntry.getSource().getCategories().add(
this.currentCategory);
this.state = State.FEED_ENTRY_SOURCE;
}
} else if (localName.equalsIgnoreCase("content")) {
if (this.state == State.FEED_ENTRY_CONTENT) {
if (!this.currentEntry.getContent().isExternal()) {
String content = this.currentContentWriter.getWriter()
.toString().trim();
contentDepth = -1;
if ("".equals(content)) {
this.currentEntry.setContent(null);
} else {
currentContent
.setInlineContent(new StringRepresentation(
content));
}
}
this.state = State.FEED_ENTRY;
}
this.currentContentWriter = null;
endContent(this.currentContent);
}
}
this.currentText = null;
this.currentDate = null;
super.endElement(uri, localName, qName);
}
@Override
public void endPrefixMapping(String prefix) throws SAXException {
this.prefixMappings.remove(prefix);
super.endPrefixMapping(prefix);
}
/**
* Returns a media type from an Atom type attribute.
*
* @param type
* The Atom type attribute.
* @return The media type.
*/
private MediaType getMediaType(String type) {
MediaType result = null;
if (type == null) {
// No type defined
} else if (type.equals("text")) {
result = MediaType.TEXT_PLAIN;
} else if (type.equals("html")) {
result = MediaType.TEXT_HTML;
} else if (type.equals("xhtml")) {
result = MediaType.APPLICATION_XHTML;
} else {
result = new MediaType(type);
}
return result;
}
/**
* Initiates the parsing of a mixed content part of the current document.
*/
private void initiateInlineMixedContent() {
this.contentDepth = 0;
StringWriter sw = new StringWriter();
currentContentWriter = new XmlWriter(sw);
for (String prefix : this.prefixMappings.keySet()) {
currentContentWriter.forceNSDecl(this.prefixMappings.get(prefix),
prefix);
}
}
@Override
public void startDocument() throws SAXException {
this.contentBuffer = new StringBuilder();
super.startDocument();
}
@Override
public void startElement(String uri, String localName, String qName,
Attributes attrs) throws SAXException {
this.contentBuffer.delete(0, this.contentBuffer.length() + 1);
if (this.contentDepth >= 0) {
// The content might embed XML elements from various namespaces
if (this.currentContentWriter != null) {
this.currentContentWriter.startElement(uri, localName, qName,
attrs);
}
this.contentDepth++;
} else if (uri.equalsIgnoreCase(Feed.ATOM_NAMESPACE)) {
if (localName.equals("title")) {
startTextElement(attrs);
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_TITLE;
} else if (this.state == State.FEED_ENTRY_SOURCE) {
this.state = State.FEED_ENTRY_SOURCE_TITLE;
}
} else if (localName.equals("updated")) {
this.currentDate = new Date();
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_UPDATED;
} else if (this.state == State.FEED_ENTRY_SOURCE) {
this.state = State.FEED_ENTRY_SOURCE_UPDATED;
}
} else if (localName.equals("published")) {
this.currentDate = new Date();
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_PUBLISHED;
}
} else if (localName.equals("author")) {
this.currentPerson = new Person();
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_AUTHOR;
} else if (this.state == State.FEED_ENTRY_SOURCE) {
this.state = State.FEED_ENTRY_SOURCE_AUTHOR;
}
} else if (localName.equals("name")) {
if (this.state == State.FEED_ENTRY_AUTHOR) {
this.state = State.FEED_ENTRY_AUTHOR_NAME;
} else if (this.state == State.FEED_ENTRY_SOURCE_AUTHOR) {
this.state = State.FEED_ENTRY_SOURCE_AUTHOR_NAME;
}
} else if (localName.equals("id")) {
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_ID;
} else if (this.state == State.FEED_ENTRY_SOURCE) {
this.state = State.FEED_ENTRY_SOURCE_ID;
}
} else if (localName.equals("link")) {
this.currentLink = new Link();
this.currentLink.setHref(new Reference(attrs.getValue("",
"href")));
this.currentLink.setRel(Relation.valueOf(attrs.getValue("",
"rel")));
String type = attrs.getValue("", "type");
if (type != null && type.length() > 0) {
this.currentLink.setType(new MediaType(type));
}
this.currentLink.setHrefLang(new Language(attrs.getValue("",
"hreflang")));
this.currentLink.setTitle(attrs.getValue("", "title"));
final String attr = attrs.getValue("", "length");
this.currentLink.setLength((attr == null) ? -1L : Long
.parseLong(attr));
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_LINK;
} else if (this.state == State.FEED_ENTRY_SOURCE) {
this.state = State.FEED_ENTRY_SOURCE_LINK;
}
// Glean the content
this.currentContent = new Content();
// Content available inline
initiateInlineMixedContent();
this.currentLink.setContent(currentContent);
startLink(this.currentLink);
} else if (localName.equalsIgnoreCase("entry")) {
this.state = State.FEED_ENTRY;
startEntry(this.currentEntry);
} else if (localName.equals("category")) {
this.currentCategory = new Category();
this.currentCategory.setTerm(attrs.getValue("", "term"));
this.currentCategory.setScheme(new Reference(attrs.getValue("",
"scheme")));
this.currentCategory.setLabel(attrs.getValue("", "label"));
if (this.state == State.FEED_ENTRY) {
this.state = State.FEED_ENTRY_CATEGORY;
} else if (this.state == State.FEED_ENTRY_SOURCE) {
this.state = State.FEED_ENTRY_SOURCE_CATEGORY;
}
} else if (localName.equalsIgnoreCase("content")) {
if (this.state == State.FEED_ENTRY) {
contentType = getMediaType(attrs.getValue("", "type"));
String srcAttr = attrs.getValue("", "src");
this.currentContent = new Content();
if (srcAttr == null) {
// Content available inline
initiateInlineMixedContent();
} else {
// Content available externally
this.currentContent.setExternalRef(new Reference(
srcAttr));
this.currentContent.setExternalType(contentType);
}
this.currentEntry.setContent(currentContent);
this.state = State.FEED_ENTRY_CONTENT;
}
startContent(this.currentContent);
}
}
super.startElement(uri, localName, qName, attrs);
}
@Override
public void startPrefixMapping(String prefix, String uri)
throws SAXException {
this.prefixMappings.put(prefix, uri);
super.startPrefixMapping(prefix, uri);
}
/**
* Receive notification of the beginning of a text element.
*
* @param attrs
* The attributes attached to the element.
*/
public void startTextElement(Attributes attrs) {
this.currentText = new Text(getMediaType(attrs.getValue("", "type")));
}
}