/*
 * 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.karaf.shell.console;

import java.util.ArrayList;
import java.util.List;

import org.apache.karaf.shell.commands.Action;
import org.apache.felix.service.command.CommandSession;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;

public abstract class OsgiCommandSupport extends AbstractAction implements Action, BundleContextAware {

    protected BundleContext bundleContext;
    protected List<ServiceReference> usedReferences;

    @Override
    public Object execute(CommandSession session) throws Exception {
        try {
            return super.execute(session);
        } finally {
            ungetServices();
        }
    }

    public BundleContext getBundleContext() {
        return bundleContext;
    }

    public void setBundleContext(BundleContext bundleContext) {
        this.bundleContext = bundleContext;
    }

    protected <T> List<T> getAllServices(Class<T> clazz, String filter) throws Exception {
        ServiceReference[] references = getBundleContext().getAllServiceReferences(clazz.getName(), filter);
        if (references == null) {
            return null;
        }
        List<T> services = new ArrayList<T>();
        for (ServiceReference ref : references) {
            T t = getService(clazz, ref);
            services.add(t);
        }
        return services;
    }

    protected <T> T getService(Class<T> clazz) {
        ServiceReference<T> sr = getBundleContext().getServiceReference(clazz);
        if (sr != null) {
            return getService(clazz, sr);
        } else {
            return null;
        }
    }

    protected <T> T getService(Class<T> clazz, ServiceReference<T> reference) {
        T t = getBundleContext().getService(reference);
        if (t != null) {
            if (usedReferences == null) {
                usedReferences = new ArrayList<ServiceReference>();
            }
            usedReferences.add(reference);
        }
        return t;
    }

    protected void ungetServices() {
        if (usedReferences != null) {
            for (ServiceReference ref : usedReferences) {
                getBundleContext().ungetService(ref);
            }
        }
    }

}

@@ -890,113 +890,142 @@
 til.
-List;%0A%0Aimport org.apache.karaf.shell.commands.Action;%0Aimport org.apache.felix.service.command.CommandSess
+Collection;%0Aimport java.util.List;%0A%0Aimport org.apache.felix.service.command.CommandSession;%0Aimport org.apache.karaf.shell.commands.Act
 ion;
@@ -1808,32 +1808,43 @@
 ption %7B%0A        
+Collection%3C
 ServiceReference
@@ -1847,10 +1847,12 @@
 ence
-%5B%5D
+%3CT%3E%3E
  ref
@@ -1883,19 +1883,16 @@
 xt().get
-All
 ServiceR
@@ -1910,18 +1910,8 @@
 lazz
-.getName()
 , fi
@@ -2058,24 +2058,27 @@
 iceReference
+%3CT%3E
  ref : refer

Fix compilation problem