ArrayTest.java

/**
*Copyright [2016] [Nabarun Mondal]
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
 */

package com.noga.njexl.lang.examples;

import com.noga.njexl.lang.JexlEngine;
import com.noga.njexl.lang.MapContext;
import com.noga.njexl.lang.Expression;
import com.noga.njexl.lang.JexlContext;
import junit.framework.TestCase;
import java.util.List;
import java.util.ArrayList;

/**
 *  Simple example to show how to access arrays.
 *
 *  @since 1.0
 */
public class ArrayTest extends TestCase {
    /**
     * An example for array access.
     */
    static void example(Output out) throws Exception {
        /**
         * First step is to retrieve an instance of a JexlEngine;
         * it might be already existing and shared or created anew.
         */
        JexlEngine jexl = new JexlEngine();
        /*
         *  Second make a jexlContext and put stuff in it
         */
        JexlContext jc = new MapContext();

        List<Object> l = new ArrayList<Object>();
        l.add("Hello from location 0");
        Integer two = new Integer(2);
        l.add(two);
        jc.set("array", l);

        Expression e = jexl.createExpression("array[1]");
        Object o = e.evaluate(jc);
        out.print("Object @ location 1 = ", o, two);

        e = jexl.createExpression("array[0].length()");
        o = e.evaluate(jc);

        out.print("The length of the string at location 0 is : ", o, Integer.valueOf(21));
    }

    /**
     * Unit test entry point.
     * @throws Exception
     */
    public void testExample() throws Exception {
        example(Output.JUNIT);
    }

    /** 
     * Command line entry point.
     * @param args command line arguments
     * @throws Exception cos jexl does. 
     */
    public static void main(String[] args) throws Exception {
        example(Output.SYSTEM);
    }
}