// $Header: /home/cvs/jakarta-jmeter/src/functions/org/apache/jmeter/functions/MachineName.java,v 1.10 2004/02/10 00:35:12 sebb Exp $
/*
 * Copyright 2004 The Apache Software Foundation.
 *
 * 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 org.apache.jmeter.functions;

import java.io.Serializable;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import org.apache.jmeter.engine.util.CompoundVariable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.threads.JMeterVariables;
import org.apache.jmeter.util.JMeterUtils;

public class MachineName extends AbstractFunction implements Serializable
{

    private static final List desc = new LinkedList();
    private static final String KEY = "__machineName";

    // Number of parameters expected - used to reject invalid calls
    private static final int PARAMETER_COUNT = 1;
    static {
        //desc.add("Use fully qualified host name: TRUE/FALSE (Default FALSE)");
        desc.add(JMeterUtils.getResString("function_name_param"));
    }

    private Object[] values;

    public MachineName()
    {
    }

    public Object clone()
    {
        return new MachineName();
    }

    public synchronized String execute(
        SampleResult previousResult,
        Sampler currentSampler)
        throws InvalidVariableException
    {

        JMeterVariables vars = getVariables();

        /*
        boolean fullHostName = false;
        if (((CompoundFunction) values[0])
            .execute()
            .toLowerCase()
            .equals("true"))
        {
            fullHostName = true;
        }
        */
        
        String varName =
            ((CompoundVariable) values[values.length - 1]).execute();
        String machineName = "";

        try
        {

            InetAddress Address = InetAddress.getLocalHost();

            //fullHostName disabled until we move up to 1.4 as the support jre
            //  if ( fullHostName ) {
            //      machineName = Address.getCanonicalHostName();

            //  } else {
            machineName = Address.getHostName();
            //  }

        }
        catch (UnknownHostException e)
        {
        }

        vars.put(varName, machineName);
        return machineName;

    }

    public void setParameters(Collection parameters)
        throws InvalidVariableException
    {

        values = parameters.toArray();

        if (values.length != PARAMETER_COUNT)
        {
            throw new InvalidVariableException(
                "Parameter Count != " + PARAMETER_COUNT);
        }

    }

    public String getReferenceKey()
    {
        return KEY;
    }

    public List getArgumentDesc()
    {
        return desc;
    }
}