/*
* 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.isis.runtimes.dflt.objectstores.xml.internal.services.xml;
import java.io.IOException;
import java.io.Writer;
import java.util.Enumeration;
import java.util.Vector;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.apache.isis.core.commons.ensure.Assert;
import org.apache.isis.core.commons.xml.ContentWriter;
import org.apache.isis.core.commons.xml.XmlFile;
import org.apache.isis.core.metamodel.adapter.oid.Oid;
import org.apache.isis.runtimes.dflt.objectstores.xml.internal.services.ServiceManager;
import org.apache.isis.runtimes.dflt.runtime.persistence.oidgenerator.simple.SerialOid;
class ServiceElement {
final SerialOid oid;
final String id;
public ServiceElement(final SerialOid oid, final String id) {
Assert.assertNotNull("oid", oid);
Assert.assertNotNull("id", id);
this.oid = oid;
this.id = id;
}
}
class ServiceHandler extends DefaultHandler {
Vector services = new Vector();
@Override
public void startElement(final String ns, final String name, final String tagName, final Attributes attrs) throws SAXException {
if (tagName.equals("service")) {
final long oid = Long.valueOf(attrs.getValue("oid"), 16).longValue();
final String id = attrs.getValue("id");
final ServiceElement service = new ServiceElement(SerialOid.createPersistent(oid), id);
services.addElement(service);
}
}
}
public class XmlServiceManager implements ServiceManager {
private static final String SERVICES_FILE_NAME = "services";
private Vector services;
private final XmlFile xmlFile;
public XmlServiceManager(final XmlFile xmlFile) {
this.xmlFile = xmlFile;
}
private String encodedOid(final SerialOid oid) {
return Long.toHexString(oid.getSerialNo()).toUpperCase();
}
@Override
public Oid getOidForService(final String name) {
for (final Enumeration e = services.elements(); e.hasMoreElements();) {
final ServiceElement element = (ServiceElement) e.nextElement();
if (element.id.equals(name)) {
return element.oid;
}
}
return null;
}
@Override
public void loadServices() {
final ServiceHandler handler = new ServiceHandler();
xmlFile.parse(handler, SERVICES_FILE_NAME);
services = handler.services;
}
@Override
public void registerService(final String name, final Oid oid) {
final SerialOid soid = (SerialOid) oid;
final ServiceElement element = new ServiceElement(soid, name);
services.addElement(element);
saveServices();
}
public final void saveServices() {
xmlFile.writeXml(SERVICES_FILE_NAME, new ContentWriter() {
@Override
public void write(final Writer writer) throws IOException {
final String tag = SERVICES_FILE_NAME;
writer.append("<" + tag + ">\n");
for (final Enumeration e = services.elements(); e.hasMoreElements();) {
final ServiceElement element = (ServiceElement) e.nextElement();
writer.append(" <service oid=\"");
writer.append(encodedOid(element.oid));
writer.append("\" id=\"");
writer.append(element.id);
writer.append("\" />\n");
}
writer.append("</" + tag + ">\n");
}
});
}
}