bundle/core/src/main/java/org/apache/karaf/bundle/command/FindClass.java

package org.apache.karaf.bundle.command;

/*
 * 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.
 */

import java.util.Collection;

import org.apache.karaf.shell.api.action.Action;
import org.apache.karaf.shell.api.action.Argument;
import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.lifecycle.Reference;
import org.apache.karaf.shell.api.action.lifecycle.Service;
import org.apache.karaf.shell.support.ShellUtil;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.wiring.BundleWiring;

@Command(scope = "bundle", name = "find-class", description = "Locates a specified class in any deployed bundle")
@Service
public class FindClass implements Action {

    @Argument(index = 0, name = "className", description = "Class name or partial class name to be found", required = true, multiValued = false)
    String className;

    @Reference
    BundleContext bundleContext;

    @Override
    public Object execute() throws Exception {
        findResource();
        return null;
    }

    protected void findResource() {
        Bundle[] bundles = bundleContext.getBundles();
        String path;
        String filter;
        int idx = className.lastIndexOf('.');
        if (idx >= 0) {
            path = className.substring(0, idx).replace('.', '/');
            if (path.isEmpty() || path.charAt(0) != '/') {
                path = "/" + path;
            }
            filter = className.substring(idx + 1) + ".class";
        } else {
            path = "/";
            filter = "*" + className + "*";
        }
        for (Bundle bundle:bundles){
            BundleWiring wiring = bundle.adapt(BundleWiring.class);
            if (wiring != null){
                Collection<String> resources = wiring.listResources(path, filter, BundleWiring.LISTRESOURCES_RECURSE);
                if (resources.size() > 0){
                    String title = ShellUtil.getBundleName(bundle);
                    System.out.println("\n" + title);
                }
                for (String resource:resources){
                    System.out.println(resource);
                }
            } else {
                System.out.println("Bundle " + bundle.getBundleId() + " is not resolved.");
            }
        }
    }

}