Output.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 junit.framework.TestCase;

/**
 * Abstracts using a test within Junit or through a main method.
 */
public abstract class Output {
    /**
     * Creates an output using System.out.
     */
    private Output() {
        // nothing to do
    }

    /**
     * Outputs the actual and value or checks the actual equals the expected value.
     * @param expr the message to output
     * @param actual the actual value to output
     * @param expected the expected value
     */
    public abstract void print(String expr, Object actual, Object expected);

    /**
     * The output instance for Junit TestCase calling assertEquals.
     */
    public static final Output JUNIT = new Output() {
        @Override
        public void print(String expr, Object actual, Object expected) {
            TestCase.assertEquals(expr, expected, actual);
        }
    };

        
    /**
     * The output instance for the general outputing to System.out.
     */
    public static final Output SYSTEM = new Output() {
        @Override
        public void print(String expr, Object actual, Object expected) {
            System.out.print(expr);
            System.out.println(actual);
        }
    };
}