GetAttributeCommandProcessor.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.felix.mosgi.jmx.httpconnector.mx4j.tools.adaptor.http;

import java.io.IOException;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;

import javax.management.JMException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.ObjectName;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * GetAttributeCommandProcessor, processes a request for getting one attribute
 * of a specific MBean. It also support some formats for types like Arrays
 *
 * @author <a href="mailto:tibu@users.sourceforge.net">Carlos Quiroz</a>
 * @version $Revision: 1.1.1.1 $
 */
public class GetAttributeCommandProcessor extends HttpCommandProcessorAdaptor
{
	public GetAttributeCommandProcessor()
	{
	}

	public Document executeRequest(HttpInputStream in) throws IOException, JMException
	{
		Document document = builder.newDocument();

		String name = in.getVariable("objectname");
		String attributeVariable = in.getVariable("attribute");
		String formatVariable = in.getVariable("format");
		ObjectName objectName = null;
		MBeanAttributeInfo targetAttribute = null;
		// special case
		boolean validMBean = false;
		if (name != null)
		{
			objectName = new ObjectName(name);
			if (server.isRegistered(objectName))
			{
				validMBean = true;
			}
		}
		if (validMBean && attributeVariable != null)
		{
			validMBean = false;
			MBeanInfo info = server.getMBeanInfo(objectName);
			MBeanAttributeInfo[] attributes = info.getAttributes();

			if (attributes != null)
			{
				for (int i=0;i<attributes.length;i++)
				{
					if (attributes[i].getName().equals(attributeVariable))
					{
						targetAttribute = attributes[i];
						validMBean = true;
						break;
					}
				}
			}
		}
		if (validMBean)
		{
			Element root = document.createElement("MBean");
			document.appendChild(root);

			root.setAttribute("objectname", objectName.toString());
			MBeanInfo info = server.getMBeanInfo(objectName);
			root.setAttribute("classname", info.getClassName());
			root.setAttribute("description", info.getDescription());

			Element attribute = document.createElement("Attribute");
			attribute.setAttribute("name", attributeVariable);
			attribute.setAttribute("classname", targetAttribute.getType());
			Object attributeValue = server.getAttribute(objectName, attributeVariable);
			attribute.setAttribute("isnull", (attributeValue==null)?"true":"false");
			root.appendChild(attribute);

			if ("array".equals(formatVariable) && attributeValue.getClass().isArray())
			{
				Element array = document.createElement("Array");
				array.setAttribute("componentclass", attributeValue.getClass().getComponentType().getName());
				int length = Array.getLength(attributeValue);
				array.setAttribute("length", "" + length);
				for (int i=0;i<length;i++) {
					Element arrayElement = document.createElement("Element");
					arrayElement.setAttribute("index", "" + i);
					if (Array.get(attributeValue, i) != null)
					{
						arrayElement.setAttribute("element", Array.get(attributeValue, i).toString());
						arrayElement.setAttribute("isnull", "false");
					}
					else
					{
						arrayElement.setAttribute("element", "null");
						arrayElement.setAttribute("isnull", "true");
					}
					array.appendChild(arrayElement);
				}
				attribute.appendChild(array);
			}
			else if ("collection".equals(formatVariable) && attributeValue instanceof Collection)
			{
				Collection collection = (Collection)attributeValue;
				Element collectionElement = document.createElement("Collection");
				collectionElement.setAttribute("length", "" + collection.size());
				Iterator i=collection.iterator();
				int j=0;
				while (i.hasNext())
				{
					Element collectionEntry = document.createElement("Element");
					collectionEntry.setAttribute("index", "" + j++);
					Object obj = i.next();
					if (obj != null)
					{
						collectionEntry.setAttribute("elementclass", obj.getClass().getName());
						collectionEntry.setAttribute("element", obj.toString());
					}
					else
					{
						collectionEntry.setAttribute("elementclass", "null");
						collectionEntry.setAttribute("element", "null");
					}
					collectionElement.appendChild(collectionEntry);
				}
				attribute.appendChild(collectionElement);
			}
			else if ("map".equals(formatVariable) && attributeValue instanceof Map)
			{
				Map map = (Map)attributeValue;
				Element mapElement = document.createElement("Map");
				mapElement.setAttribute("length", "" + map.size());
				Iterator i=map.keySet().iterator();
				int j=0;
				while (i.hasNext())
				{
					Element mapEntry = document.createElement("Element");
					mapEntry.setAttribute("index", "" + j++);
					Object key = i.next();
					Object entry = map.get(key);
					if (entry != null && key != null)
					{
						mapEntry.setAttribute("keyclass", key.getClass().getName());
						mapEntry.setAttribute("key", key.toString());
						mapEntry.setAttribute("elementclass", entry.getClass().getName());
						mapEntry.setAttribute("element", entry.toString());
					}
					else
					{
						mapEntry.setAttribute("keyclass", "null");
						mapEntry.setAttribute("key", "null");
						mapEntry.setAttribute("elementclass", "null");
						mapEntry.setAttribute("element", "null");
					}
					mapElement.appendChild(mapEntry);
				}
				attribute.appendChild(mapElement);
			}
			else
			{
				attribute.setAttribute("value", attributeValue.toString());
			}

		}
		return document;
	}
}