ByteBuffersTest.java

/*
 * Copyright (c) 2013-2017 Cinchapi Inc.
 *
 * 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.cinchapi.concourse.util;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;

import org.junit.Assert;
import org.junit.Test;

import com.cinchapi.concourse.util.ByteBuffers;
import com.cinchapi.concourse.util.Random;
import com.google.common.base.Strings;

/**
 * Unit tests for {@link ByteBuffers} utility methods
 * 
 * @author Jeff Nelson
 */
public class ByteBuffersTest {
    
    @Test
    public void testDeserializeStringTrailingWhitespace(){
        String string = Random.getString().trim();
        int numWhiteSpaces = Random.getScaleCount();
        string = Strings.padEnd(string, string.length() + numWhiteSpaces, ' ');
        ByteBuffer bytes = ByteBuffer.wrap(string.getBytes(StandardCharsets.UTF_8));
        String string2 = ByteBuffers.getString(bytes, StandardCharsets.UTF_8);
        Assert.assertEquals(string, string2);
    }
    
    @Test
    public void testDeserializeStringLeadingWhitespace(){
        String string = Random.getString().trim();
        int numWhiteSpaces = Random.getScaleCount();
        string = Strings.padStart(string, string.length() + numWhiteSpaces, ' ');
        ByteBuffer bytes = ByteBuffer.wrap(string.getBytes(StandardCharsets.UTF_8));
        String string2 = ByteBuffers.getString(bytes, StandardCharsets.UTF_8);
        Assert.assertEquals(string, string2);
    }
    
    @Test
    public void testDeserializeStringLeadingAndTrailingWhitespace(){
        String string = Random.getString().trim();
        int numWhiteSpaces1 = Random.getScaleCount();
        int numWhiteSpaces2 = Random.getScaleCount();
        string = Strings.padStart(string, string.length() + numWhiteSpaces1, ' ');
        string = Strings.padEnd(string, string.length() + numWhiteSpaces2, ' ');
        ByteBuffer bytes = ByteBuffer.wrap(string.getBytes(StandardCharsets.UTF_8));
        String string2 = ByteBuffers.getString(bytes, StandardCharsets.UTF_8);
        Assert.assertEquals(string, string2);
    }
    
    @Test
    public void testDeserializeStringNoWhitespace(){
        String string = Random.getString().trim();
        ByteBuffer bytes = ByteBuffer.wrap(string.getBytes(StandardCharsets.UTF_8));
        String string2 = ByteBuffers.getString(bytes, StandardCharsets.UTF_8);
        Assert.assertEquals(string, string2);
    }
    
    @Test
    public void testExpandWontCreateNewBufferIfNotNeccessary(){
        ByteBuffer destination = ByteBuffer.allocate(10);
        ByteBuffer original = destination;
        ByteBuffer source = ByteBuffer.allocate(3);
        destination.putInt(4);
        source.putShort((short) 1);
        destination = ByteBuffers.expand(destination, ByteBuffers.rewind(source));
        Assert.assertSame(original, destination);
        Assert.assertEquals(10, ByteBuffers.rewind(destination).remaining());
    }
    
    @Test
    public void testExpandNewBuffer(){
        ByteBuffer destination = ByteBuffer.allocate(10);
        ByteBuffer original = destination;
        ByteBuffer source = ByteBuffer.allocate(10);
        destination.putInt(4);
        source.putLong(8);
        destination = ByteBuffers.expand(destination, ByteBuffers.rewind(source));
        Assert.assertNotSame(original, destination);
    }

}