Android Open Source - Kite Evaluator

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Back to project page Kite.

License

The source code is released under:

Apache License

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Java Source Code

/**
 * // ww w  .ja  v  a  2  s . c o  m
 */
package com.efurture.kite.expression;

import java.util.Map;

import com.efurture.kite.param.Params;

/**
 * 
 * Math expression evaluator, if you want to make customer math evaluator. 
 * just make a subclass of Evaluator.
 * 
 * @author gubaojian   email: gubaojian@163.com
 *  */
public abstract class Evaluator {

  /**
   * evaluate match expression, and return value
   * @param expression expression to evaluate
   * @param paramsMap  variable for evaluate expression
   * */
  public final int eval(String expression, Map<String, Object> paramsMap) throws EvaluatorException{
    String standardExpression = standard(expression);
    return evalute(standardExpression, paramsMap);
  }

  
  /**
   * subclass implements to evaluate standard expression
   * @param expression  standard expression, which is lowercase, dp is replace by *density
   * @param paramsMap   variable for evaluate expression
   * */
  protected  abstract int  evalute(String expression, Map<String, Object> paramsMap) throws EvaluatorException;
  

  /**
   * standard expression,
   * 1, make expression lowercase
   * 2, replace dp with   *density.  40dp to 40*density;
   * */
  private String standard(String expression){
    String standard = expression.toLowerCase();
    standard = standard.replaceAll("dp",  "*" + Params.DENSITY);
    return standard;
  }
    

}

Java Source Code List