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The source code

// $Header: /home/cvs/jakarta-jmeter/src/core/org/apache/jmeter/engine/util/CompoundVariable.java,v 1.23 2004/02/13 02:21:38 sebb Exp $
/*
 * Copyright 2003-2004 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.engine.util;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.apache.jmeter.functions.Function;
import org.apache.jmeter.functions.InvalidVariableException;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.threads.JMeterContext;
import org.apache.jmeter.threads.JMeterContextService;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.jorphan.reflect.ClassFinder;
import org.apache.log.Logger;


/**
 * CompoundFunction.
 *
 * @author mstover
 * @version $Id: CompoundVariable.java,v 1.23 2004/02/13 02:21:38 sebb Exp $
 */
public class CompoundVariable implements Function
{
    transient private static Logger log =
        LoggingManager.getLoggerForClass();
        
    private String rawParameters;
    
    static FunctionParser functionParser = new FunctionParser();

    static Map functions = new HashMap();
    private boolean hasFunction, isDynamic;

    private String permanentResults = "";
    
    LinkedList compiledComponents = new LinkedList();

    static {
        try
        {
            List classes =
                ClassFinder.findClassesThatExtend(
                    JMeterUtils.getSearchPaths(),
                    new Class[] { Function.class },
                    true);
            Iterator iter = classes.iterator();
            while (iter.hasNext())
            {
                Function tempFunc =
                    (Function) Class
                        .forName((String) iter.next())
                        .newInstance();
                functions.put(tempFunc.getReferenceKey(), tempFunc.getClass());
            }
        }
        catch (Exception err)
        {
            log.error("", err);
        }
    }


    public CompoundVariable()
    {
        super();
        isDynamic = true;
        hasFunction = false;
    }
    
    public CompoundVariable(String parameters)
    {
        this();
        try
        {
            setParameters(parameters);
        }
        catch (InvalidVariableException e)
        {
        }
    }

    public String execute()
    {
        if (isDynamic)
        {
            JMeterContext context = JMeterContextService.getContext();
            SampleResult previousResult = context.getPreviousResult();
            Sampler currentSampler = context.getCurrentSampler();
            return execute(previousResult, currentSampler);
        }
        else
        {
            return permanentResults;
        }
    }
    
    /**
     * Allows the retrieval of the original String prior to it being compiled.
     * @return String
     */
    public String getRawParameters()
    {
        return rawParameters;
    }
 
    /* (non-Javadoc)
     * @see Function#execute(SampleResult, Sampler)
     */
    public String execute(SampleResult previousResult, Sampler currentSampler)
    {
        if (compiledComponents == null || compiledComponents.size() == 0)
        {
            return "";
        }
        boolean testDynamic = false;
        StringBuffer results = new StringBuffer();
        Iterator iter = compiledComponents.iterator();
        while (iter.hasNext())
        {
            Object item = iter.next();
            if (item instanceof Function)
            {
                testDynamic = true;
                try
                {
                    results.append(
                        ((Function) item).execute(
                            previousResult,
                            currentSampler));
                }
                catch (InvalidVariableException e)
                {
                }
            }
            else if (item instanceof SimpleVariable)
            {
                testDynamic = true;
                results.append(((SimpleVariable) item).toString());
            }
            else
            {
                results.append(item);
            }
        }
        if(!testDynamic)
        {
            isDynamic = false;
            permanentResults = results.toString();
        }
        return results.toString();
    }

    public CompoundVariable getFunction()
    {
        CompoundVariable func = new CompoundVariable();
        func.compiledComponents = (LinkedList) compiledComponents.clone();
        func.rawParameters = rawParameters;
        return func;
    }

    public List getArgumentDesc()
    {
        return new LinkedList();
    }

    public void clear()
    {
        hasFunction = false;
        compiledComponents.clear();
    }

    public void setParameters(String parameters)
        throws InvalidVariableException
    {
        this.rawParameters = parameters;
        if (parameters == null || parameters.length() == 0)
        {
            return;
        }

        compiledComponents = functionParser.compileString(parameters);
        if (compiledComponents.size() > 1
            || !(compiledComponents.get(0) instanceof String))
        {
            hasFunction = true;
        }
    }

    /* (non-Javadoc)
     * @see org.apache.jmeter.functions.Function#setParameters(Collection)
     */
    public void setParameters(Collection parameters)
        throws InvalidVariableException
    {
    }
    
    static Object getNamedFunction(String functionName)
        throws InvalidVariableException
    {
        if(functions.containsKey(functionName))
        {
            try
            {
                return (Function) ((Class) functions.get(functionName))
                    .newInstance();
            }
            catch (Exception e)
            {
                log.error("", e);
                 throw new InvalidVariableException();
            }
        }
        else
        {
            return new SimpleVariable(functionName);
        }
    }

    public boolean hasFunction()
    {
        return hasFunction;
    }

    /**
     * @see Function#getReferenceKey()
     */
    public String getReferenceKey()
    {
        return "";
    }
    /*
     * NOT USED
     *
    private JMeterVariables getVariables()
    {
        return JMeterContextService.getContext().getVariables();
    }
	*/
}
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