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Dynamic Include filter for Apache Sling

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/*-
 * 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.dynamicinclude;

import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

import java.util.regex.Matcher;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.ReferencePolicy;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.SlingHttpServletRequest;

@Component
@Service(ConfigurationWhiteboard.class)
public class ConfigurationWhiteboard {

    @Reference(referenceInterface = Configuration.class, cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE, policy = ReferencePolicy.DYNAMIC)
    private Set configs = new CopyOnWriteArraySet();

    public Configuration getConfiguration(SlingHttpServletRequest request, String resourceType) {
        for (Configuration c : configs) {
            if (isEnabled(c, request) && c.isSupportedResourceType(resourceType)) {
                return c;
            }
        }
        return null;
    }

    private boolean isEnabled(Configuration config, SlingHttpServletRequest request) {
        final String requestPath = request.getRequestPathInfo().getResourcePath();
        return config.isEnabled() && config.getPathMatcher().match(requestPath);
    }

    protected void bindConfigs(final Configuration config) {
        configs.add(config);
    }

    protected void unbindConfigs(final Configuration config) {
        configs.remove(config);
    }
}