/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.gdata.gom.core;
import java.util.Stack;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.apache.lucene.gdata.gom.GOMDocument;
import org.apache.lucene.gdata.gom.GOMEntry;
import org.apache.lucene.gdata.gom.GOMFeed;
import org.apache.lucene.gdata.gom.GOMNamespace;
/**
* @author Simon Willnauer
*/
public class GOMBuilder {
private final XMLStreamReader streamReader;
private final GOMFactory factory;
private final Stack<AtomParser> parserStack;
/**
* @param arg0
*/
public GOMBuilder(XMLStreamReader arg0) {
if (arg0 == null)
throw new IllegalArgumentException(
"XMLStreamReader instance must not be null");
this.streamReader = arg0;
this.factory = GOMFactory.createInstance();
this.parserStack = new Stack<AtomParser>();
}
public GOMDocument<GOMFeed> buildGOMFeed() throws XMLStreamException {
GOMDocument<GOMFeed> document = new GOMDocumentImpl<GOMFeed>();
GOMFeed element = startFeedDocument(document);
document.setRootElement(element);
parse(this.streamReader);
return document;
}
private void parse(XMLStreamReader aReader) throws XMLStreamException {
int next = 0;
while ((next = next()) != XMLStreamConstants.END_DOCUMENT) {
if (next == XMLStreamConstants.START_ELEMENT) {
AtomParser childParser = this.parserStack.peek()
.getChildParser(this.streamReader.getName());
processAttributes(childParser);
this.parserStack.push(childParser);
} else if (next == XMLStreamConstants.END_ELEMENT) {
this.parserStack.pop().processEndElement();
} else if (next == XMLStreamConstants.CHARACTERS) {
this.parserStack.peek().processElementValue(
this.streamReader.getText());
} else if (next == XMLStreamConstants.CDATA) {
System.out.println("CDdata");
}
// System.out.println(next);
}
}
/**
* @param childParser
*/
private void processAttributes(AtomParser childParser) {
int attributeCount = this.streamReader.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
childParser.processAttribute(this.streamReader.getAttributeName(i),
this.streamReader.getAttributeValue(i));
}
}
public GOMDocument<GOMEntry> buildGOMEntry() throws XMLStreamException {
GOMDocument<GOMEntry> document = new GOMDocumentImpl<GOMEntry>();
GOMEntry element = startEntryDocument(document);
document.setRootElement(element);
parse(this.streamReader);
return document;
}
private GOMEntry startEntryDocument(GOMDocument aDocument)
throws XMLStreamException {
aDocument.setVersion(this.streamReader.getVersion());
aDocument.setCharacterEncoding(this.streamReader
.getCharacterEncodingScheme());
GOMEntry entry = this.factory.createEntry();
if (next() != XMLStreamConstants.START_ELEMENT)
throw new GDataParseException("Expected start of feed element");
processAttributes(entry);
this.parserStack.push(entry);
int count = this.streamReader.getNamespaceCount();
for (int i = 0; i < count; i++) {
GOMNamespace namespace = new GOMNamespace(this.streamReader
.getNamespaceURI(i), this.streamReader
.getNamespacePrefix(i));
entry.addNamespace(namespace);
}
return entry;
}
private GOMFeed startFeedDocument(GOMDocument aDocument)
throws XMLStreamException {
aDocument.setVersion(this.streamReader.getVersion());
aDocument.setCharacterEncoding(this.streamReader
.getCharacterEncodingScheme());
GOMFeed feed = this.factory.createFeed();
if (next() != XMLStreamConstants.START_ELEMENT)
throw new GDataParseException("Expected start of feed element");
processAttributes(feed);
this.parserStack.push(feed);
int count = this.streamReader.getNamespaceCount();
for (int i = 0; i < count; i++) {
GOMNamespace namespace = new GOMNamespace(this.streamReader
.getNamespaceURI(i), this.streamReader
.getNamespacePrefix(i));
System.out.println(namespace);
feed.addNamespace(namespace);
}
return feed;
}
private int next() throws XMLStreamException {
return this.streamReader.next();
}
}