/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.util;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.XMLEvent;
import javax.xml.transform.stax.StAXSource;
import org.teiid.core.types.Streamable;
import org.teiid.core.types.XMLType;
import org.teiid.core.util.AccessibleByteArrayOutputStream;
/**
* Provides an {@link InputStream} adapter for StAX
*/
public class XMLInputStream extends InputStream {
private static final int BUFFER_SIZE = 1<<13;
private int pos = 0;
private AccessibleByteArrayOutputStream baos = new AccessibleByteArrayOutputStream(BUFFER_SIZE);
private XMLEventReader reader;
private XMLEventWriter writer;
/**
* Return a UTF-8 {@link InputStream} of the XML
* @param source
* @param outFactory
* @throws XMLStreamException
*/
public XMLInputStream(StAXSource source, XMLOutputFactory outFactory) throws XMLStreamException {
this(source, outFactory, Streamable.ENCODING);
}
public XMLInputStream(StAXSource source, XMLOutputFactory outFactory, String encoding) throws XMLStreamException {
reader = source.getXMLEventReader();
if (reader == null) {
this.reader = XMLType.getXmlInputFactory().createXMLEventReader(source.getXMLStreamReader());
}
this.writer = outFactory.createXMLEventWriter(baos, encoding);
}
@Override
public int read() throws IOException {
while (pos >= baos.getCount()) {
if (!reader.hasNext()) {
return -1;
}
if (baos.getCount() > BUFFER_SIZE) {
baos.setCount(0);
pos = 0;
}
try {
XMLEvent event = reader.nextEvent();
writer.add(event);
writer.flush();
} catch (XMLStreamException e) {
throw new IOException(e);
}
}
return 0xff & baos.getBuffer()[pos++];
}
@Override
public void close() throws IOException {
try {
reader.close();
} catch (XMLStreamException e) {
throw new IOException(e);
}
}
}