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Author: SimplyProgrammer

examples/SimpleCalculator.java

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+package examples;
+
+import java.util.Scanner;
+
+import org.ugp.serialx.Registry;
+import org.ugp.serialx.converters.DataParser;
+import org.ugp.serialx.converters.NumberConverter;
+import org.ugp.serialx.converters.OperationGroups;
+import org.ugp.serialx.converters.operators.ArithmeticOperators;
+
+/**
+ * This example will show you simple implementation of SerialX latest feature the recursive data parser!
+ * In this example we will be creating simple evaluator of mathematical expressions!
+ * 
+ * @author PETO
+ * 
+ * @since 1.3.0
+ */
+public class SimpleCalculator
+{
+	static Scanner scIn = new Scanner(System.in);
+	
+	public static void main(String[] args) 
+	{
+		/*
+		 * We could easily just use DataParser.REGISTRY but there is tone of stuff we do not need and it will just slow it down!
+		 */
+		Registry<DataParser> parsersRequiredToEvaluateMath = new Registry<>(new OperationGroups(), new ArithmeticOperators(), new NumberConverter());
+		
+		/*
+		 * This is an example of simple custom parser this one will allow us to reuse answers of out previous evaluations!
+		 * We will access this old answer using 'ans' word!
+		 * Old ans must be provided as first one of args!
+		 */
+		DataParser ansParser = new DataParser() 
+		{
+			@Override
+			public Object parse(Registry<DataParser> myHomeRegistry, String str, Object... args) 
+			{
+				if (str.equalsIgnoreCase("ans"))
+				{
+					if (args.length > 0)
+						return args[0];
+					return null;
+				}
+				return CONTINUE;
+			}
+		};
+		parsersRequiredToEvaluateMath.add(ansParser);
+
+		Object oldAns = null;
+		while (true)
+		{
+			System.out.print("Please insert your math problem: "); //Ask for input!
+			String input = scIn.nextLine() ;//Read console input
+			if (!(input = input.trim()).isEmpty()) //Avoiding empty input!
+			{
+				double t0 = System.nanoTime(); //Performing simple benchmark
+				oldAns = DataParser.parseObj(parsersRequiredToEvaluateMath, input, oldAns); //Notice that we are inserting oldAns as compiler arguments for parseObj which are then picked up by our ansParser as well as every other registered DataParser.
+				double t = System.nanoTime();
+				
+				System.out.println(input + " = " + oldAns +"\n" + (t-t0)/1000000 + "ms \n"); //Parsing input!
+			}
+		}
+	}
+}