util/src/test/java/org/apache/directory/api/util/ByteBufferTest.java

/*
 *  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
 *  
 *    https://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.directory.api.util;


import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.parallel.Execution;
import org.junit.jupiter.api.parallel.ExecutionMode;

/**
 * A test case for a dynamically growing byte[]. 
 *
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
@Execution(ExecutionMode.CONCURRENT)
public class ByteBufferTest
{
    @Test
    public void testByteBufferGrowth()
    {
        ExpansibleByteBuffer buf = new ExpansibleByteBuffer();
        assertEquals( 10, buf.capacity() );

        for ( int ii = 0; ii < 20; ii++ )
        {
            buf.append( ii );
            assertEquals( ii, buf.get( ii ) );
            assertEquals( ii, buf.buffer()[ii] );
        }

        assertEquals( 20, buf.capacity() );
        buf.append( 20 );
        assertEquals( 30, buf.capacity() );

        // -------------------------------------------------------------------

        buf = new ExpansibleByteBuffer( 5 );
        assertEquals( 5, buf.capacity() );

        for ( int ii = 0; ii < 5; ii++ )
        {
            buf.append( ii );
            assertEquals( ii, buf.get( ii ) );
            assertEquals( ii, buf.buffer()[ii] );
        }

        assertEquals( 5, buf.capacity() );
        buf.append( 5 );
        assertEquals( 10, buf.capacity() );
    }


    @Test
    public void testCopyOfUsedBytes()
    {
        ExpansibleByteBuffer buf = new ExpansibleByteBuffer();
        byte[] bytes = buf.copyOfUsedBytes();
        assertEquals( 0, bytes.length );

        for ( int ii = 0; ii < 20; ii++ )
        {
            buf.append( ii );
            assertEquals( ii, buf.get( ii ) );
            assertEquals( ii, buf.buffer()[ii] );
            assertEquals( ii, buf.copyOfUsedBytes()[ii] );
        }
    }


    @Test
    public void testAppendByteArray()
    {
        ExpansibleByteBuffer buf = new ExpansibleByteBuffer();
        buf.append( new byte[]
            { 0, 1, 2, 3, 4 } );
        for ( int ii = 0; ii < 5; ii++ )
        {
            assertEquals( ii, buf.get( ii ) );
            assertEquals( ii, buf.buffer()[ii] );
            assertEquals( ii, buf.copyOfUsedBytes()[ii] );
        }
    }
}