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 Spring > Expression Language > Elvis Operator

Elvis Operator 

The Spring Expression Language (SpEL) is a simple and powerful expression language which helps to query and manipulate objects at runtime. The following example shows using Elvis operator. It behaves similar to Ternary operator. Its shorter syntax is handy while evaluating complex expressions.

File Name  :  
com/bethecoder/tutorials/spring3/tests/spel/ElvisOperatorTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.spring3.tests.spel;

import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

public class ElvisOperatorTest {

  /**
   @param args
   */
  public static void main(String[] args) {

    ExpressionParser parser = new SpelExpressionParser();
    StandardEvaluationContext stdContext = new StandardEvaluationContext();
    String value = null;
    
    stdContext.setVariable("user""BTC");
    value = parser.parseExpression(
        "#user?: 'Unknown User'").getValue(stdContext, String.class);
    System.out.println(value);  //BTC

    
    stdContext.setVariable("user"null);
    value = parser.parseExpression(
        "#user?: 'Unknown User'").getValue(stdContext, String.class);
    System.out.println(value);  //Unknown User

  }

}
   

It gives the following output,
BTC
Unknown User


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