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The Commons Jexl library is an implementation of the JSTL Expression Language with extensions. This was customized by nmondal.

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/**
 * Copyright 2015 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.testing.api;

import com.noga.njexl.testing.api.Annotations.*;
import com.noga.njexl.testing.api.junit.JClassRunner;
import org.junit.runner.RunWith;

import java.security.SecureRandom;

/**
 * Created by noga on 27/05/15.
 */

@RunWith(JClassRunner.class)
@NApiService(base = "samples/")
@NApiServiceCreator
public class NApiAnnotationSample {

    static final boolean _RANDOM_EX_ = false ;

    @NApiServiceInit
    public NApiAnnotationSample(){}

    @NApi(use=false, dataSource = "UIData.xlsx", dataTable = "add" ,
            before = "pre.jexl", after = "post.jexl", globals = {"op=+"} )
    @NApiThread(use = false)
    public int add(int a, int b) {
        int r = a + b ;
        System.out.printf("%d + %d = %d \n", a, b, r );
        return r;
    }

    @NApi(randomize = true, dataSource = "UIData.xlsx", dataTable = "sub" ,
            before = "pre.jexl", after = "post.jexl" , globals = { "op=-" } )
    @NApiThread(dcd = true, performance = @Performance())
    public int subtract(int a, int b) {
        int r = a - b ;
        System.out.printf("%d - %d = %d \n", a, b, r );
        SecureRandom sr = new SecureRandom();
        if ( _RANDOM_EX_ && sr.nextBoolean()){ throw new Error("Random Error!"); }
        return r;
    }
}