com.ibm.stocator.fs.swift2d.SwiftTestUtils.java Source code

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Here is the source code for com.ibm.stocator.fs.swift2d.SwiftTestUtils.java

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/**
 * (C) Copyright IBM Corp. 2015, 2016
 *
 * 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.ibm.stocator.fs.swift2d;

import java.io.IOException;

import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

/**
 * Utilities used across test cases
 */
public class SwiftTestUtils extends org.junit.Assert {

    /**
     * Read an object from Swift
     *
     * @param fs filesystem
     * @param path object bath
     * @param len how much to read
     * @return byte array
     * @throws IOException if can't read an object
     */
    public static byte[] readDataset(FileSystem fs, Path path, int len) throws IOException {
        FSDataInputStream in = fs.open(path);
        byte[] dest = new byte[len];
        try {
            in.readFully(0, dest);
        } finally {
            in.close();
        }
        return dest;
    }

    /**
     * Random dataset
     *
     * @param len length of data
     * @param base base of the data
     * @param modulo the modulo
     * @return the newly generated dataset
     */
    public static byte[] generateDataset(int len, int base, int modulo) {
        byte[] dataset = new byte[len];
        for (int i = 0; i < len; i++) {
            dataset[i] = (byte) (base + (i % modulo));
        }
        return dataset;
    }
}