Java tutorial
/* * Copyright 2012 Intuit Inc. All Rights Reserved */ package com.intuit.tank.harness.functions; /* * #%L * Intuit Tank Agent (apiharness) * %% * Copyright (C) 2011 - 2015 Intuit Inc. * %% * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * #L% */ import java.util.Random; import org.apache.commons.jexl2.JexlContext; import org.apache.commons.lang.math.NumberUtils; import com.intuit.tank.vm.common.util.ExpressionContextVisitor; /** * * JexlNumericFunctions numerical based functions like add, subtract and modulo. Also contains random number generators * of different lengths * * @author rchalmela * */ public class JexlNumericFunctions implements ExpressionContextVisitor { static Random rnd = new Random(); /** * * @{inheritDoc */ @Override public void visit(JexlContext context) { context.set("numericFunctions", this); } /** * finds first number modulo second number * * @param num * @param mod * @return result as a string */ public String mod(Object num, Object mod) { return Integer.toString(FunctionHandler.getInt(num) % FunctionHandler.getInt(mod)); } /** * Adds all values together * * @param values * @return summation */ public String add(Object... values) { double result = 0; for (int i = 0; i < values.length; i++) { result += FunctionHandler.getDouble(values[i]); } return Double.toString(result); } /** * Subtracts all values from the first value * * @param values * @return subtraction of values */ public String subtract(Object... values) { double result = FunctionHandler.getDouble(values[0]); for (int i = 1; i < values.length; i++) { result -= FunctionHandler.getDouble(values[i]); } return Double.toString(result); } /** * Returns a random number between min(inclusive) and max(exclusive) * * @param min * the min number * @param max * the maximum number * @return the value */ public String random(Object omin, Object omax) { int min = FunctionHandler.getInt(omin); int max = FunctionHandler.getInt(omax); if (max > min) { return Integer.toString(rnd.nextInt(max - min) + min); } return "0"; } /** * Returns a random number between 0(inclusive) and max(exclusive) * * @param max * the maximum number * @return the value */ public String random(Object omax) { return random(0, omax); } /** * Get a random, positive whole number * * @param length * The length of the full numbers * @return A random whole number */ public String randomPositiveWhole(Object olength) { int length = FunctionHandler.getInt(olength); if (length == 0) { return ""; } StringBuilder output = new StringBuilder(length); output.append(rnd.nextInt(8) + 1); for (int i = 0; i < length - 1; i++) { output.append(rnd.nextInt(9)); } return output.toString(); } /** * Get a random, negative whole number * * @param length * The length of the full numbers * @return A random whole number */ public String randomNegativeWhole(Object olength) { return "-" + randomPositiveWhole(olength); } /** * Get a random, positive float * * @param whole * The number of whole digits * @param decimal * The number of decimal digits * @return A random float */ public String randomPositiveFloat(Object owhole, Object odecimal) { int whole = FunctionHandler.getInt(owhole); int decimal = FunctionHandler.getInt(odecimal); StringBuilder output = new StringBuilder(); output.append(rnd.nextInt(8) + 1); for (int i = 0; i < whole - 1; i++) { output.append(rnd.nextInt(9)); } output.append("."); for (int i = 0; i < decimal; i++) { output.append(rnd.nextInt(9)); } return output.toString(); } /** * Get a random, negative float * * @param whole * The number of whole digits * @param decimal * The number of decimal digits * @return A random float */ public String randomNegativeFloat(Object owhole, Object odecimal) { return "-" + randomPositiveFloat(owhole, odecimal); } /** * converts the Double to an Int * * @param num * @return */ public String toInt(String num) { return Integer.toString(FunctionHandler.getInt(num)); } }