/*
 * 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.jmeter.testelement.property;

import org.apache.jmeter.engine.util.CompoundVariable;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.threads.JMeterContext;
import org.apache.jmeter.threads.JMeterContextService;

/**
 * Class that implements the Function property
 */
public class FunctionProperty extends AbstractProperty {
	transient CompoundVariable function;

	int testIteration = -1;

	String cacheValue;

	public FunctionProperty(String name, CompoundVariable func) {
		super(name);
		function = func;
	}

	public FunctionProperty() {
		super();
	}

	public void setObjectValue(Object v) {
		if (v instanceof CompoundVariable && !isRunningVersion()) {
			function = (CompoundVariable) v;
		} else {
			cacheValue = v.toString();
		}
	}

	public boolean equals(Object o) {
		if (o instanceof FunctionProperty) {
			if (function != null) {
				return function.equals(((JMeterProperty) o).getObjectValue());
			}
		}
		return false;
	}

	/**
	 * Executes the function (and caches the value for the duration of the test
	 * iteration) if the property is a running version. Otherwise, the raw
	 * string representation of the function is provided.
	 * 
	 * @see JMeterProperty#getStringValue()
	 */
	public String getStringValue() {
		JMeterContext ctx = JMeterContextService.getContext();// Expensive, so
																// do
		// once
		if (!isRunningVersion() /*|| !ctx.isSamplingStarted()*/) {
			log.debug("Not running version, return raw function string");
			return function.getRawParameters();
		}
        if(!ctx.isSamplingStarted()) {
            return function.execute();
        }
		log.debug("Running version, executing function");
		int iter = ctx.getVariables() != null ? ctx.getVariables().getIteration() : -1;
		if (iter < testIteration) {
			testIteration = -1;
		}
		if (iter > testIteration || cacheValue == null) {
			testIteration = iter;
			cacheValue = function.execute();
		}
		return cacheValue;

	}

	/**
	 * @see JMeterProperty#getObjectValue()
	 */
	public Object getObjectValue() {
		return function;
	}

	public Object clone() {
		FunctionProperty prop = (FunctionProperty) super.clone();
		prop.cacheValue = cacheValue;
		prop.testIteration = testIteration;
		prop.function = function;
		return prop;
	}

	/**
	 * @see JMeterProperty#recoverRunningVersion(TestElement)
	 */
	public void recoverRunningVersion(TestElement owner) {
		cacheValue = null;
	}
}
