/*
* 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.sling.resourcemerger.impl;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.commons.osgi.PropertiesUtil;
import org.apache.sling.resourcemerger.spi.MergedResourcePicker;
import org.apache.sling.resourcemerger.spi.MergedResourcePicker2;
import org.apache.sling.spi.resource.provider.ResourceProvider;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
@Component
public class MergedResourcePickerWhiteboard implements ServiceTrackerCustomizer {
private ServiceTracker tracker;
private BundleContext bundleContext;
private final Map<Long, ServiceRegistration> serviceRegistrations = new ConcurrentHashMap<Long, ServiceRegistration>();
@Activate
protected void activate(final BundleContext bundleContext) throws InvalidSyntaxException {
this.bundleContext = bundleContext;
tracker = new ServiceTracker(bundleContext, bundleContext.createFilter("(|(objectClass=" + MergedResourcePicker.class.getName() +
")(objectClass=" + MergedResourcePicker2.class.getName() + "))"), this);
tracker.open();
}
@Deactivate
protected void deactivate() {
tracker.close();
}
@Override
public Object addingService(final ServiceReference reference) {
final Object pickerObj = bundleContext.getService(reference);
if ( pickerObj != null ) {
final String mergeRoot = PropertiesUtil.toString(reference.getProperty(MergedResourcePicker2.MERGE_ROOT), null);
if (mergeRoot != null) {
boolean readOnly = PropertiesUtil.toBoolean(reference.getProperty(MergedResourcePicker2.READ_ONLY), true);
boolean traverseParent = PropertiesUtil.toBoolean(reference.getProperty(MergedResourcePicker2.TRAVERSE_PARENT), false);
final MergedResourcePicker2 picker;
if ( pickerObj instanceof MergedResourcePicker2 ) {
picker = (MergedResourcePicker2)pickerObj;
} else {
final MergedResourcePicker deprecatedPicker = (MergedResourcePicker)pickerObj;
picker = new MergedResourcePicker2() {
@Override
public List<Resource> pickResources(ResourceResolver resolver, String relativePath, Resource relatedResource) {
return deprecatedPicker.pickResources(resolver, relativePath);
}
};
}
MergingResourceProvider provider = readOnly ?
new MergingResourceProvider(mergeRoot, picker, true, traverseParent) :
new CRUDMergingResourceProvider(mergeRoot, picker, traverseParent);
final Dictionary<Object, Object> props = new Hashtable<Object, Object>();
props.put(ResourceProvider.PROPERTY_NAME, readOnly ? "Merging" : "CRUDMerging");
props.put(ResourceProvider.PROPERTY_ROOT, mergeRoot);
props.put(ResourceProvider.PROPERTY_MODIFIABLE, !readOnly);
props.put(ResourceProvider.PROPERTY_AUTHENTICATE, ResourceProvider.AUTHENTICATE_NO);
final Long key = (Long) reference.getProperty(Constants.SERVICE_ID);
final ServiceRegistration reg = bundleContext.registerService(ResourceProvider.class.getName(), provider, props);
serviceRegistrations.put(key, reg);
}
return pickerObj;
}
return null;
}
@Override
public void modifiedService(final ServiceReference reference, final Object service) {
removedService(reference, service);
addingService(reference);
}
@Override
public void removedService(final ServiceReference reference, final Object service) {
final Long key = (Long) reference.getProperty(Constants.SERVICE_ID);
final ServiceRegistration reg = serviceRegistrations.get(key);
if ( reg != null ) {
reg.unregister();
this.bundleContext.ungetService(reference);
}
}
}