Interpreter Pattern - And and Or expression example

Author: premaseem

InterpreterPattern/src/com/premaseem/interpreterPattern/andOrExpression/ClientFile.java

@@ -0,0 +1,93 @@
+package com.premaseem.interpreterPattern.andOrExpression;
+
+import java.util.Scanner;
+
+public class ClientFile {
+	
+	
+	  //Rule: Robert and John are male
+	   public static Expression getMaleExpression(){
+	      Expression robert = new TerminalExpression("Robert");
+	      Expression john = new TerminalExpression("John");
+	      return new OrExpression(robert, john);		
+	   }
+
+	   //Rule: Julie is a married women
+	   public static Expression getMarriedWomanExpression(){
+	      Expression julie = new TerminalExpression("Julie");
+	      Expression married = new TerminalExpression("Married");
+	      return new AndExpression(julie, married);		
+	   }
+
+	public static void main(String[] args) {
+
+		System.out.println("Interpeter expression  ");
+		Scanner scan = new Scanner(System.in);
+
+	     Expression isMale = getMaleExpression();
+	      Expression isMarriedWoman = getMarriedWomanExpression();
+
+	      System.out.println("John is male? " + isMale.interpret("John"));
+	      System.out.println("Julie is a married women? " 
+	      + isMarriedWoman.interpret("Married Julie"));
+		System.out.println("\n $$$$$$$$$$$$$$$$$$$$  Thanks by Prem Aseem $$$$$$$$$$$$$$$$$$$$$$ \n ");
+		System.out.println("\n $$$$$$$$$$$$$$$$$$$$$  www.premaseem.com  $$$$$$$$$$$$$$$$$$$$$$ \n ");
+
+	}
+	
+
+
+}
+
+interface Expression {
+	public boolean interpret(String context);
+}
+
+class TerminalExpression implements Expression {
+	
+	   private String data;
+
+	   public TerminalExpression(String data){
+	      this.data = data; 
+	   }
+
+	   @Override
+	   public boolean interpret(String context) {
+	      if(context.contains(data)){
+	         return true;
+	      }
+	      return false;
+	   }
+	}
+
+class OrExpression implements Expression {
+	 
+	   private Expression expr1 = null;
+	   private Expression expr2 = null;
+
+	   public OrExpression(Expression expr1, Expression expr2) { 
+	      this.expr1 = expr1;
+	      this.expr2 = expr2;
+	   }
+
+	   @Override
+	   public boolean interpret(String context) {		
+	      return expr1.interpret(context) || expr2.interpret(context);
+	   }
+	}
+
+class AndExpression implements Expression {
+	 
+	   private Expression expr1 = null;
+	   private Expression expr2 = null;
+
+	   public AndExpression(Expression expr1, Expression expr2) { 
+	      this.expr1 = expr1;
+	      this.expr2 = expr2;
+	   }
+
+	   @Override
+	   public boolean interpret(String context) {		
+	      return expr1.interpret(context) && expr2.interpret(context);
+	   }
+	}