testdocumentoutputstream.java

介绍java核心技术的pio编程方法以及基本概念

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   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
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
   limitations under the License.
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package org.apache.poi.poifs.filesystem;

import java.io.*;

import java.util.*;

import junit.framework.*;

import org.apache.poi.poifs.property.DirectoryProperty;
import org.apache.poi.poifs.property.DocumentProperty;
import org.apache.poi.poifs.storage.RawDataBlock;

/**
 * Class to test DocumentOutputStream functionality
 *
 * @author Marc Johnson
 */

public class TestDocumentOutputStream
    extends TestCase
{

    /**
     * Constructor TestDocumentOutputStream
     *
     * @param name
     *
     * @exception IOException
     */

    public TestDocumentOutputStream(String name)
        throws IOException
    {
        super(name);
    }

    /**
     * test write(int) behavior
     *
     * @exception IOException
     */

    public void testWrite1()
        throws IOException
    {
        ByteArrayOutputStream stream  = new ByteArrayOutputStream();
        DocumentOutputStream  dstream = new DocumentOutputStream(stream, 25);

        for (int j = 0; j < 25; j++)
        {
            dstream.write(j);
        }
        try
        {
            dstream.write(0);
            fail("Should have caught IOException");
        }
        catch (IOException ignored)
        {
        }
        byte[] output = stream.toByteArray();

        assertEquals(25, output.length);
        for (int j = 0; j < 25; j++)
        {
            assertEquals(( byte ) j, output[ j ]);
        }
        stream.close();
    }

    /**
     * test write(byte[]) behavior
     *
     * @exception IOException
     */

    public void testWrite2()
        throws IOException
    {
        ByteArrayOutputStream stream  = new ByteArrayOutputStream();
        DocumentOutputStream  dstream = new DocumentOutputStream(stream, 25);

        for (int j = 0; j < 6; j++)
        {
            byte[] array = new byte[ 4 ];

            Arrays.fill(array, ( byte ) j);
            dstream.write(array);
        }
        try
        {
            byte[] array = new byte[ 4 ];

            Arrays.fill(array, ( byte ) 7);
            dstream.write(array);
            fail("Should have caught IOException");
        }
        catch (IOException ignored)
        {
        }
        byte[] output = stream.toByteArray();

        assertEquals(24, output.length);
        for (int j = 0; j < 6; j++)
        {
            for (int k = 0; k < 4; k++)
            {
                assertEquals(String.valueOf((j * 4) + k), ( byte ) j,
                             output[ (j * 4) + k ]);
            }
        }
        stream.close();
    }

    /**
     * test write(byte[], int, int) behavior
     *
     * @exception IOException
     */

    public void testWrite3()
        throws IOException
    {
        ByteArrayOutputStream stream  = new ByteArrayOutputStream();
        DocumentOutputStream  dstream = new DocumentOutputStream(stream, 25);
        byte[]                array   = new byte[ 50 ];

        for (int j = 0; j < 50; j++)
        {
            array[ j ] = ( byte ) j;
        }
        dstream.write(array, 1, 25);
        try
        {
            dstream.write(array, 0, 1);
            fail("Should have caught IOException");
        }
        catch (IOException ignored)
        {
        }
        byte[] output = stream.toByteArray();

        assertEquals(25, output.length);
        for (int j = 0; j < 25; j++)
        {
            assertEquals(( byte ) (j + 1), output[ j ]);
        }
        stream.close();
    }

    /**
     * test writeFiller()
     *
     * @exception IOException
     */

    public void testWriteFiller()
        throws IOException
    {
        ByteArrayOutputStream stream  = new ByteArrayOutputStream();
        DocumentOutputStream  dstream = new DocumentOutputStream(stream, 25);

        for (int j = 0; j < 25; j++)
        {
            dstream.write(j);
        }
        try
        {
            dstream.write(0);
            fail("Should have caught IOException");
        }
        catch (IOException ignored)
        {
        }
        dstream.writeFiller(100, ( byte ) 0xff);
        byte[] output = stream.toByteArray();

        assertEquals(100, output.length);
        for (int j = 0; j < 25; j++)
        {
            assertEquals(( byte ) j, output[ j ]);
        }
        for (int j = 25; j < 100; j++)
        {
            assertEquals(String.valueOf(j), ( byte ) 0xff, output[ j ]);
        }
        stream.close();
    }

    /**
     * main method to run the unit tests
     *
     * @param ignored_args
     */

    public static void main(String [] ignored_args)
    {
        System.out.println(
            "Testing org.apache.poi.poifs.filesystem.DocumentOutputStream");
        junit.textui.TestRunner.run(TestDocumentOutputStream.class);
    }
}