/*
* #%L
* JBossOSGi Repository: API
* %%
* Copyright (C) 2012 - 2013 JBoss by Red Hat
* %%
* This program 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 program 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/lgpl-2.1.html>.
* #L%
*/
package org.jboss.gravia.repository.spi;
import java.io.OutputStream;
import java.util.Map;
import java.util.Map.Entry;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import org.jboss.gravia.repository.Namespace100;
import org.jboss.gravia.repository.RepositoryStorageException;
import org.jboss.gravia.repository.RepositoryWriter;
import org.jboss.gravia.repository.Namespace100.Attribute;
import org.jboss.gravia.repository.Namespace100.Element;
import org.jboss.gravia.resource.Capability;
import org.jboss.gravia.resource.Requirement;
import org.jboss.gravia.resource.Resource;
import org.jboss.gravia.resource.spi.AttributeValueHandler;
import org.jboss.gravia.resource.spi.AttributeValueHandler.AttributeValue;
/**
* Write repository contnet to XML.
*
* @author thomas.diesler@jboss.com
* @since 21-May-2012
*/
public abstract class AbstractRepositoryXMLWriter implements RepositoryWriter {
private final XMLStreamWriter writer;
public AbstractRepositoryXMLWriter(OutputStream outputStream) {
if (outputStream == null)
throw new IllegalArgumentException("Null outputStream");
writer = createXMLStreamWriter(outputStream);
}
protected abstract XMLStreamWriter createXMLStreamWriter(OutputStream outputStream);
@Override
public void writeRepositoryElement(Map<String, String> attributes) {
try {
writer.writeStartDocument();
writer.setDefaultNamespace(Namespace100.REPOSITORY_NAMESPACE);
writer.writeStartElement(Element.REPOSITORY.getLocalName());
writer.writeDefaultNamespace(Namespace100.REPOSITORY_NAMESPACE);
for (Entry<String, String> entry : attributes.entrySet()) {
writer.writeAttribute(entry.getKey(), entry.getValue());
}
} catch (XMLStreamException ex) {
throw new RepositoryStorageException("Cannot write repository element", ex);
}
}
@Override
public void writeResource(Resource resource) {
try {
writer.writeStartElement(Element.RESOURCE.getLocalName());
for (Capability cap : resource.getCapabilities(null)) {
writer.writeStartElement(Element.CAPABILITY.getLocalName());
writer.writeAttribute(Attribute.NAMESPACE.getLocalName(), cap.getNamespace());
writeAttributes(cap.getAttributes());
writeDirectives(cap.getDirectives());
writer.writeEndElement();
}
for (Requirement req : resource.getRequirements(null)) {
writer.writeStartElement(Element.REQUIREMENT.getLocalName());
writer.writeAttribute(Attribute.NAMESPACE.getLocalName(), req.getNamespace());
writeAttributes(req.getAttributes());
writeDirectives(req.getDirectives());
writer.writeEndElement();
}
writer.writeEndElement();
} catch (XMLStreamException ex) {
throw new IllegalStateException("Cannot initialize repository writer", ex);
}
}
@Override
public void close() {
try {
writer.writeEndElement();
writer.writeEndDocument();
writer.close();
} catch (XMLStreamException ex) {
throw new RepositoryStorageException("Cannot write repository element", ex);
}
}
private void writeAttributes(Map<String, Object> attributes) throws XMLStreamException {
for (Entry<String, Object> entry : attributes.entrySet()) {
AttributeValue attval = AttributeValue.create(entry.getValue());
writer.writeStartElement(Element.ATTRIBUTE.getLocalName());
writer.writeAttribute(Attribute.NAME.getLocalName(), entry.getKey());
if (attval.isListType()) {
writer.writeAttribute(Attribute.VALUE.getLocalName(), attval.getValueString());
writer.writeAttribute(Attribute.TYPE.getLocalName(), "List<" + attval.getType() + ">");
} else {
writer.writeAttribute(Attribute.VALUE.getLocalName(), attval.getValueString());
if (attval.getType() != AttributeValueHandler.Type.String) {
writer.writeAttribute(Attribute.TYPE.getLocalName(), attval.getType().toString());
}
}
writer.writeEndElement();
}
}
private void writeDirectives(Map<String, String> directives) throws XMLStreamException {
for (Entry<String, String> entry : directives.entrySet()) {
writer.writeStartElement(Element.DIRECTIVE.getLocalName());
writer.writeAttribute(Attribute.NAME.getLocalName(), entry.getKey());
writer.writeAttribute(Attribute.VALUE.getLocalName(), entry.getValue());
writer.writeEndElement();
}
}
}