org.apache.hadoop.io.TestArrayOutputStream.java Source code

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Here is the source code for org.apache.hadoop.io.TestArrayOutputStream.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.hadoop.io;

import static org.junit.Assert.*;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Random;

import org.apache.commons.lang.RandomStringUtils;
import org.junit.Test;

public class TestArrayOutputStream {

    @Test
    public void testWriting() throws IOException {
        // compare this implementation
        ArrayOutputStream aos = new ArrayOutputStream(10);
        for (int i = 0; i < 10; i++) {
            // make sure reset clears up the buffer
            aos.reset();
            // compare with standard java.io backed implementation
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            DataOutputStream dos = new DataOutputStream(bos);
            runComparison(aos, dos, bos);
        }
    }

    private void runComparison(ArrayOutputStream aos, DataOutputStream dos, ByteArrayOutputStream bos)
            throws IOException {
        Random r = new Random();
        // byte
        int b = r.nextInt(128);
        aos.write(b);
        dos.write(b);

        // byte[]
        byte[] bytes = new byte[10];
        r.nextBytes(bytes);
        aos.write(bytes, 0, 10);
        dos.write(bytes, 0, 10);

        // Byte
        aos.writeByte(b);
        dos.writeByte(b);

        // boolean
        boolean bool = r.nextBoolean();
        aos.writeBoolean(bool);
        dos.writeBoolean(bool);

        // short
        short s = (short) r.nextInt();
        aos.writeShort(s);
        dos.writeShort(s);

        // char
        int c = r.nextInt();
        aos.writeChar(c);
        dos.writeChar(c);

        // int
        int i = r.nextInt();
        aos.writeInt(i);
        dos.writeInt(i);

        // long
        long l = r.nextLong();
        aos.writeLong(l);
        dos.writeLong(l);

        // float
        float f = r.nextFloat();
        aos.writeFloat(f);
        dos.writeFloat(f);

        // double
        double d = r.nextDouble();
        aos.writeDouble(d);
        dos.writeDouble(d);

        // strings
        String str = RandomStringUtils.random(20);
        aos.writeBytes(str);
        aos.writeChars(str);
        aos.writeUTF(str);
        dos.writeBytes(str);
        dos.writeChars(str);
        dos.writeUTF(str);

        byte[] expected = bos.toByteArray();
        assertEquals(expected.length, aos.size());

        byte[] actual = new byte[aos.size()];
        System.arraycopy(aos.getBytes(), 0, actual, 0, actual.length);
        // serialized bytes should be the same
        assertTrue(Arrays.equals(expected, actual));
    }
}