Examples of org.apache.commons.io.output.ByteArrayOutputStream

org.apache.commons.io.output.ByteArrayOutputStream
This class implements an output stream in which the data is written into a byte array. The buffer automatically grows as data is written to it.
The data can be retrieved using toByteArray() and toString().
Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
This is an alternative implementation of the java.io.ByteArrayOutputStream class. The original implementation only allocates 32 bytes at the beginning. As this class is designed for heavy duty it starts at 1024 bytes. In contrast to the original it doesn't reallocate the whole memory block but allocates additional buffers. This way no buffers need to be garbage collected and the contents don't have to be copied to the new buffer. This class is designed to behave exactly like the original. The only exception is the deprecated toString(int) method that has been ignored. @author Jeremias Maerki @version $Id: ByteArrayOutputStream.java 369075 2006-01-14 18:23:42Z scolebourne $

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }


    public void testCopy_readerToWriter_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(out, "US-ASCII");
        try {
            IOUtils.copy((Reader) null, writer);
            fail();

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        super( name );
    }


    private String getOutput( String threadName )
    {
        ByteArrayOutputStream output =
            m_outputMap.get( threadName );
        assertNotNull( "getOutput()", output );


        return output.toString();
    }

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    private void startWriter( String name,
                              String data,
                              DemuxOutputStream demux )
        throws Exception
    {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        m_outputMap.put( name, output );
        WriterThread thread =
            new WriterThread( name, data, output, demux );
        m_threadMap.put( name, thread );
    }

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        }
    }
    
    protected byte[] generateTestData(long size) {
        try {
            ByteArrayOutputStream baout = new ByteArrayOutputStream();
            generateTestData(baout, size);
            return baout.toByteArray();
        } catch (IOException ioe) {
            throw new RuntimeException("This should never happen: " + ioe.getMessage());
        }
    }

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     * @return the requested byte array
     * @throws NullPointerException if the input is null
     * @throws IOException if an I/O error occurs
     */
    public static byte[] toByteArray(InputStream input) throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        copy(input, output);
        return output.toByteArray();
    }

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     * @return the requested byte array
     * @throws NullPointerException if the input is null
     * @throws IOException if an I/O error occurs
     */
    public static byte[] toByteArray(Reader input) throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        copy(input, output);
        return output.toByteArray();
    }

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     * @throws IOException if an I/O error occurs
     * @since Commons IO 1.1
     */
    public static byte[] toByteArray(Reader input, String encoding)
            throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        copy(input, output, encoding);
        return output.toByteArray();
    }

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        }
    }
    
    protected byte[] generateTestData(long size) {
        try {
            ByteArrayOutputStream baout = new ByteArrayOutputStream();
            generateTestData(baout, size);
            return baout.toByteArray();
        } catch (IOException ioe) {
            throw new RuntimeException("This should never happen: " + ioe.getMessage());
        }
    }

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        byte[] testArray = new byte[256];


        for (int j = 0; j < 256; j++) {
            testArray[j] = (byte) j;
        }
        ByteArrayOutputStream stream = new ByteArrayOutputStream();


        HexDump.dump(testArray, 0, stream, 0);
        byte[] outputArray = new byte[16 * (73 + HexDump.EOL.length())];


        for (int j = 0; j < 16; j++) {
            int offset = (73 + HexDump.EOL.length()) * j;


            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) toHex(j);
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) ' ';
            for (int k = 0; k < 16; k++) {
                outputArray[offset++] = (byte) toHex(j);
                outputArray[offset++] = (byte) toHex(k);
                outputArray[offset++] = (byte) ' ';
            }
            for (int k = 0; k < 16; k++) {
                outputArray[offset++] = (byte) toAscii((j * 16) + k);
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                    HexDump.EOL.getBytes().length);
        }
        byte[] actualOutput = stream.toByteArray();


        assertEquals("array size mismatch", outputArray.length,
                actualOutput.length);
        for (int j = 0; j < outputArray.length; j++) {
            assertEquals("array[ " + j + "] mismatch", outputArray[j],
                    actualOutput[j]);
        }


        // verify proper behavior with non-zero offset
        stream = new ByteArrayOutputStream();
        HexDump.dump(testArray, 0x10000000, stream, 0);
        outputArray = new byte[16 * (73 + HexDump.EOL.length())];
        for (int j = 0; j < 16; j++) {
            int offset = (73 + HexDump.EOL.length()) * j;


            outputArray[offset++] = (byte) '1';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) toHex(j);
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) ' ';
            for (int k = 0; k < 16; k++) {
                outputArray[offset++] = (byte) toHex(j);
                outputArray[offset++] = (byte) toHex(k);
                outputArray[offset++] = (byte) ' ';
            }
            for (int k = 0; k < 16; k++) {
                outputArray[offset++] = (byte) toAscii((j * 16) + k);
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                    HexDump.EOL.getBytes().length);
        }
        actualOutput = stream.toByteArray();
        assertEquals("array size mismatch", outputArray.length,
                actualOutput.length);
        for (int j = 0; j < outputArray.length; j++) {
            assertEquals("array[ " + j + "] mismatch", outputArray[j],
                    actualOutput[j]);
        }


        // verify proper behavior with negative offset
        stream = new ByteArrayOutputStream();
        HexDump.dump(testArray, 0xFF000000, stream, 0);
        outputArray = new byte[16 * (73 + HexDump.EOL.length())];
        for (int j = 0; j < 16; j++) {
            int offset = (73 + HexDump.EOL.length()) * j;


            outputArray[offset++] = (byte) 'F';
            outputArray[offset++] = (byte) 'F';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) toHex(j);
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) ' ';
            for (int k = 0; k < 16; k++) {
                outputArray[offset++] = (byte) toHex(j);
                outputArray[offset++] = (byte) toHex(k);
                outputArray[offset++] = (byte) ' ';
            }
            for (int k = 0; k < 16; k++) {
                outputArray[offset++] = (byte) toAscii((j * 16) + k);
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                    HexDump.EOL.getBytes().length);
        }
        actualOutput = stream.toByteArray();
        assertEquals("array size mismatch", outputArray.length,
                actualOutput.length);
        for (int j = 0; j < outputArray.length; j++) {
            assertEquals("array[ " + j + "] mismatch", outputArray[j],
                    actualOutput[j]);
        }


        // verify proper behavior with non-zero index
        stream = new ByteArrayOutputStream();
        HexDump.dump(testArray, 0x10000000, stream, 0x81);
        outputArray = new byte[(8 * (73 + HexDump.EOL.length())) - 1];
        for (int j = 0; j < 8; j++) {
            int offset = (73 + HexDump.EOL.length()) * j;


            outputArray[offset++] = (byte) '1';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) '0';
            outputArray[offset++] = (byte) toHex(j + 8);
            outputArray[offset++] = (byte) '1';
            outputArray[offset++] = (byte) ' ';
            for (int k = 0; k < 16; k++) {
                int index = 0x81 + (j * 16) + k;


                if (index < 0x100) {
                    outputArray[offset++] = (byte) toHex(index / 16);
                    outputArray[offset++] = (byte) toHex(index);
                } else {
                    outputArray[offset++] = (byte) ' ';
                    outputArray[offset++] = (byte) ' ';
                }
                outputArray[offset++] = (byte) ' ';
            }
            for (int k = 0; k < 16; k++) {
                int index = 0x81 + (j * 16) + k;


                if (index < 0x100) {
                    outputArray[offset++] = (byte) toAscii(index);
                }
            }
            System.arraycopy(HexDump.EOL.getBytes(), 0, outputArray, offset,
                    HexDump.EOL.getBytes().length);
        }
        actualOutput = stream.toByteArray();
        assertEquals("array size mismatch", outputArray.length,
                actualOutput.length);
        for (int j = 0; j < outputArray.length; j++) {
            assertEquals("array[ " + j + "] mismatch", outputArray[j],
                    actualOutput[j]);
        }


        // verify proper behavior with negative index
        try {
            HexDump.dump(testArray, 0x10000000, new ByteArrayOutputStream(),
                    -1);
            fail("should have caught ArrayIndexOutOfBoundsException on negative index");
        } catch (ArrayIndexOutOfBoundsException ignored_exception) {


            // as expected
        }


        // verify proper behavior with index that is too large
        try {
            HexDump.dump(testArray, 0x10000000, new ByteArrayOutputStream(),
                    testArray.length);
            fail("should have caught ArrayIndexOutOfBoundsException on large index");
        } catch (ArrayIndexOutOfBoundsException ignored_exception) {


            // as expected

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            jobs.put(d.getJsonSafeClassName(),cnt);
        }
        o.put("jobs",jobs);


        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();


            // json -> UTF-8 encode -> gzip -> encrypt -> base64 -> string
            OutputStreamWriter w = new OutputStreamWriter(new GZIPOutputStream(new CombinedCipherOutputStream(baos,getKey(),"AES")), "UTF-8");
            o.write(w);
            w.close();


            return new String(Base64.encode(baos.toByteArray()));
        } catch (GeneralSecurityException e) {
            throw new Error(e); // impossible
        }
    }

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