topology-manager/src/main/java/org/apache/aries/rsa/topologymanager/importer/local/FilterHelper.java

/*
 * 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.aries.rsa.topologymanager.importer.local;

import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.osgi.framework.Constants;

public final class FilterHelper {
    private static final String OBJECTCLASS_EXPRESSION = ".*\\(" + Constants.OBJECTCLASS + "=([^)]+)\\).*";
    private static final Pattern OBJECTCLASS_PATTERN = Pattern.compile(OBJECTCLASS_EXPRESSION);

    private FilterHelper() {
        // prevent instantiation
    }

    public static String getObjectClass(String filter) {
        if (filter != null) {
            Matcher matcher = OBJECTCLASS_PATTERN.matcher(filter);
            if (matcher.matches() && matcher.groupCount() >= 1) {
                return matcher.group(1);
            }
        }
        return null;
    }

    private static final Set<String> SYSTEM_PACKAGES;
    static {
        SYSTEM_PACKAGES = new HashSet<>();
        SYSTEM_PACKAGES.add("org.osgi.service");
        SYSTEM_PACKAGES.add("org.apache.felix");
        SYSTEM_PACKAGES.add("org.ops4j.pax.logging");
        SYSTEM_PACKAGES.add("ch.ethz.iks.slp");
        SYSTEM_PACKAGES.add("org.ungoverned.osgi.service");
        SYSTEM_PACKAGES.add("org.springframework.osgi.context.event.OsgiBundleApplicationContextListener");
        SYSTEM_PACKAGES.add("java.net.ContentHandler");
    }

    public static boolean isClassExcluded(String className) {
        if (className == null) {
            return true;
        }

        if (className.startsWith("org.osgi.service.clusterinfo")) {
            return false;
        }

        for (String p : SYSTEM_PACKAGES) {
            if (className.startsWith(p)) {
                return true;
            }
        }
        return false;
    }

    public static String getFullFilter(String objectClass, String filter) {
        if (objectClass == null) {
            return filter;
        }
        String nameFilter = String.format("(objectClass=%s)", objectClass);
        return (filter == null) ? nameFilter : String.format("(&%s%s)", nameFilter, filter);
    }
}