/*
* #%L
* Gravia :: Repository
* %%
* Copyright (C) 2012 - 2014 JBoss by Red Hat
* %%
* Licensed 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.
* #L%
*/
package org.jboss.gravia.repository.spi;
import java.io.IOException;
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.ContentCapability;
import org.jboss.gravia.resource.ContentNamespace;
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;
import org.jboss.gravia.utils.IllegalArgumentAssertion;
/**
* 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) {
IllegalArgumentAssertion.assertNotNull(outputStream, "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 {
writeResource(writer, resource, null);
} catch (IOException ex) {
throw new RepositoryStorageException("Cannot write resource", ex);
}
}
public static void writeResource(XMLStreamWriter writer, Resource resource, ContentHandler contentHandler) throws IOException {
try {
writer.writeStartElement(Element.RESOURCE.getLocalName());
for (Capability cap : resource.getCapabilities(null)) {
if (ContentNamespace.CONTENT_NAMESPACE.equals(cap.getNamespace())) {
writeContentCapability(writer, cap.adapt(ContentCapability.class), contentHandler);
} else {
writeCapability(writer, cap);
}
}
for (Requirement req : resource.getRequirements(null)) {
writeRequirement(writer, req);
}
writer.writeEndElement();
} catch (XMLStreamException ex) {
throw new IllegalStateException("Cannot initialize repository writer", ex);
}
}
public static void writeCapability(XMLStreamWriter writer, Capability cap) throws IOException, XMLStreamException {
writer.writeStartElement(Element.CAPABILITY.getLocalName());
writer.writeAttribute(Attribute.NAMESPACE.getLocalName(), cap.getNamespace());
writeAttributes(writer, cap.getAttributes());
writeDirectives(writer, cap.getDirectives());
writer.writeEndElement();
}
public static void writeContentCapability(XMLStreamWriter writer, ContentCapability ccap, ContentHandler contentHandler) throws IOException, XMLStreamException {
writer.writeStartElement(Element.CAPABILITY.getLocalName());
writer.writeAttribute(Attribute.NAMESPACE.getLocalName(), ccap.getNamespace());
writeAttributes(writer, contentHandler != null ? contentHandler.process(ccap) : ccap.getAttributes());
writeDirectives(writer, ccap.getDirectives());
writer.writeEndElement();
}
public static void writeRequirement(XMLStreamWriter writer, Requirement req) throws XMLStreamException {
writer.writeStartElement(Element.REQUIREMENT.getLocalName());
writer.writeAttribute(Attribute.NAMESPACE.getLocalName(), req.getNamespace());
writeAttributes(writer, req.getAttributes());
writeDirectives(writer, req.getDirectives());
writer.writeEndElement();
}
@Override
public void close() {
try {
writer.writeEndElement();
writer.writeEndDocument();
writer.close();
} catch (XMLStreamException ex) {
throw new RepositoryStorageException("Cannot write repository element", ex);
}
}
private static void writeAttributes(XMLStreamWriter writer, 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 static void writeDirectives(XMLStreamWriter writer, 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();
}
}
}