InvokeOperationCommandProcessor.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 javax.management.ObjectName;
import javax.management.JMException;
import javax.management.MalformedObjectNameException;
import javax.management.MBeanInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;

import java.io.IOException;
import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * InvokeOperationCommandProcessor, processes a request for unregistering an MBean
 *
 * @author <a href="mailto:tibu@users.sourceforge.net">Carlos Quiroz</a>
 * @version $Revision: 1.1.1.1 $
 */
public class InvokeOperationCommandProcessor extends HttpCommandProcessorAdaptor
{
  public InvokeOperationCommandProcessor()
  {
  }

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

    Element root = document.createElement("MBeanOperation");
    document.appendChild(root);
    Element operationElement = document.createElement("Operation");
    operationElement.setAttribute("operation", "invoke");
    root.appendChild(operationElement);

    String objectVariable = in.getVariable("objectname");
    String operationVariable = in.getVariable("operation");
    if (objectVariable == null || objectVariable.equals("")
      || operationVariable == null || operationVariable.equals(""))
    {
      operationElement.setAttribute("result", "error");
      operationElement.setAttribute("errorMsg", "Incorrect parameters in the request");
      return document;
    }
    operationElement.setAttribute("objectname", objectVariable);
    List types = new ArrayList();
    List values = new ArrayList();
    int i=0;
    boolean unmatchedParameters = false;
    boolean valid = false;
    do
    {
      String parameterType = in.getVariable("type"+i);
      String parameterValue = in.getVariable("value"+i);
      valid = (parameterType != null && parameterValue != null);
      if (valid)
      {
        types.add(parameterType);
        Object value = null;
        try
        {
          value = CommandProcessorUtil.createParameterValue(parameterType, parameterValue);
        }

        catch (Exception e)
        {
          operationElement.setAttribute("result", "error");
          operationElement.setAttribute("errorMsg", "Parameter " + i + ": " + parameterValue +  " cannot be converted to type " + parameterType);
          return document;
        }
        if (value != null)
        {
          values.add(value);
        }
      }
      if (parameterType == null ^ parameterValue == null)
      {
        unmatchedParameters = true;
        break;
      }
      i++;
    }
    while (valid);
    if (objectVariable == null || objectVariable.equals("") ||
      operationVariable == null || operationVariable.equals(""))
    {
      operationElement.setAttribute("result", "error");
      operationElement.setAttribute("errorMsg", "Incorrect parameters in the request");
      return document;
    }
    if (unmatchedParameters)
    {
      operationElement.setAttribute("result", "error");
      operationElement.setAttribute("errorMsg", "count of parameter types doesn't match count of parameter values");
      return document;
    }
    ObjectName name = null;
    try
    {
      name = new ObjectName(objectVariable);
    }
    catch (MalformedObjectNameException e)
    {
      operationElement.setAttribute("result", "error");
      operationElement.setAttribute("errorMsg", "Malformed object name");
      return document;
    }

    if (server.isRegistered(name))
    {
      MBeanInfo info = server.getMBeanInfo(name);
      MBeanOperationInfo[] operations = info.getOperations();
      boolean match = false;
      if (operations != null)
      {
        for (int j=0;j<operations.length;j++)
        {
          if (operations[j].getName().equals(operationVariable))
          {
            MBeanParameterInfo[] parameters = operations[j].getSignature();
            if (parameters.length != types.size())
            {
              continue;
            }
            Iterator k = types.iterator();
            boolean signatureMatch = true;
            for (int p = 0;p<types.size();p++)
            {
              if (!parameters[p].getType().equals(k.next()))
              {
                signatureMatch = false;
                break;
              }
            }
            match = signatureMatch;
          }
          if (match)
          {
            break;
          }
        }
      }
      if (!match)
      {
        operationElement.setAttribute("result", "error");
        operationElement.setAttribute("errorMsg", "Operation singature has no match in the MBean");
      }
      else
      {
        try
        {
          Object[] params = values.toArray();
          String[] signature = new String[types.size()];
          types.toArray(signature);
          Object returnValue = server.invoke(name, operationVariable, params, signature);
          operationElement.setAttribute("result", "success");
                    if (returnValue != null)
                    {
                        operationElement.setAttribute("returnclass", returnValue.getClass().getName());
                        operationElement.setAttribute("return", returnValue.toString());
                    } else
                    {
                       operationElement.setAttribute("returnclass", null);
             operationElement.setAttribute("return", null);
                    }
        }
        catch (Exception e)
        {
          operationElement.setAttribute("result", "error");
          operationElement.setAttribute("errorMsg", e.getMessage());
        }
      }
    }
    else
    {
      if (name != null)
      {
        operationElement.setAttribute("result", "error");
        operationElement.setAttribute("errorMsg", new StringBuffer("MBean ").append(name).append(" not registered").toString());
      }
    }
    return document;
  }

}