org.apache.sqoop.test.utils.ParametrizedUtils.java Source code

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Here is the source code for org.apache.sqoop.test.utils.ParametrizedUtils.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.sqoop.test.utils;

import org.apache.commons.lang.ArrayUtils;

import java.util.LinkedList;

/**
 * Various utils to help build expected structure for JUNIT Parametrized runner.
 */
public class ParametrizedUtils {

    /**
     * Join two arrays of parameters by providing their cross product to make
     * testing matrix for Parameterized runner easier.
     *
     * This method accepts both arguments as array of arrays. In such case
     * the inner array will be flattened during the join to meet the Parametrized
     * runner requirements.
     *
     * @param v1 First array of test values
     * @param v2 Second array of test values
     * @return Cross product of v1 and v2
     */
    public static Iterable<Object[]> crossProduct(Object[] v1, Object[] v2) {
        LinkedList<Object[]> ret = new LinkedList<Object[]>();

        for (Object o1 : v1) {
            for (Object o2 : v2) {
                ret.add(mergeObjects(o1, o2));
            }
        }

        return ret;
    }

    /**
     * Merge two objects into array.
     *
     * This method will flatten any argument that is already an array, e.g.:
     *
     * mergeObjects(1, 2) = [1, 2]
     * mergeObjects([1], 2) = [1, 2]
     * mergeObjects(1, [2]) = [1, 2]
     * mergeObjects([1], [2]) = [1, 2]
     *
     * @param o1
     * @param o2
     * @return
     */
    public static Object[] mergeObjects(Object o1, Object o2) {
        if (!o1.getClass().isArray() && !o2.getClass().isArray()) {
            return new Object[] { o1, o2 };
        }

        Object[] a1 = toArray(o1);
        Object[] a2 = toArray(o2);

        return ArrayUtils.addAll(a1, a2);
    }

    /**
     * Convert object into one element array if it's not an array already.
     *
     * @param o
     * @return
     */
    public static Object[] toArray(Object o) {
        if (o.getClass().isArray()) {
            return (Object[]) o;
        }

        return new Object[] { o };
    }
}