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commands OSGi blueprint bundle project.
There is a newer version: 6.4.0
/**
 * Copyright 2018 Mike Hummel
 *
 * Licensed 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 de.mhus.karaf.commands.shell;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;

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.Service;
import org.osgi.framework.Bundle;
import org.osgi.framework.FrameworkUtil;

import de.mhus.osgi.services.util.OsgiBundleClassLoader;

@Command(scope = "shell", name = "inspectClass", description = "Inspect a class")
@Service
public class CmdClassInspect implements Action {

	@Argument(index=0, name="classname", required=true, description="Class name", multiValued=false)
    String className;

	@SuppressWarnings("deprecation")
    @Override
	public Object execute() throws Exception {

		OsgiBundleClassLoader cl = new OsgiBundleClassLoader();
		Class clazz = cl.loadClass(className);
		
		System.out.println("Class " + className + ":");
		Bundle bundle = FrameworkUtil.getBundle(clazz);
		if (bundle == null)
		    System.out.println("Unknown Bundle");
		else
		    System.out.println("Bundle: " + bundle.getBundleId() + " " + bundle.getSymbolicName());
		System.out.println();
		
		System.out.println("Constructors: ");
		for (Constructor con : clazz.getConstructors()) {
            boolean first = true;
		    for (Parameter p : con.getParameters()) {
                if (first)
                    System.out.print(" -> ");
                else
                    System.out.print(",");
		        System.out.println(p.getName() + " : " + p.getType().getCanonicalName());
		    }
		}
		System.out.println("Fields:");
		for (Field field : clazz.getFields())
		    System.out.println((field.isAccessible() ? " public " : " hidden " ) + field.getName() + " : " + field.getType().getCanonicalName() );
		
		System.out.println("Methods:");
		for (Method method : clazz.getMethods()) {
			if ( !method.getDeclaringClass().getName().equals("java.lang.Object")) {
				System.out.println(" " + method.getName() + "          (declared in " + method.getDeclaringClass().getName() + ")");
				boolean first = true;
				for (Parameter p : method.getParameters()) {
					if (first)
						System.out.print(" -> ");
					else
						System.out.print(",");
					System.out.print(p.getName() + " : " + p.getType().getCanonicalName());
					first = false;
				}
				if (!first)
					System.out.println();
				if (method.getReturnType() != void.class) {
					System.out.println(" <- " + method.getReturnType().getName());
				}
				System.out.println();
			}
		}
		
		return null;
	}

}