Package org.eclipse.nebula.widgets.picture.internal.output

Class ByteArrayOutputStream

java.lang.Object
java.io.OutputStream
org.eclipse.nebula.widgets.picture.internal.output.ByteArrayOutputStream
All Implemented Interfaces:
java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable
public class ByteArrayOutputStream
extends java.io.OutputStream
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.

Version:
$Id: ByteArrayOutputStream.java 1021884 2010-10-12 18:49:16Z ggregory $

  • Constructor Summary

    Constructors 
    Constructor Description
    ByteArrayOutputStream()
    Creates a new byte array output stream.
    ByteArrayOutputStream​(int size)
    Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.

  • Method Summary

    Modifier and Type Method Description
    void close()
    Closing a ByteArrayOutputStream has no effect.
    void reset()  
    int size()
    Return the current size of the byte array.
    static java.io.InputStream toBufferedInputStream​(java.io.InputStream input)
    Fetches entire contents of an InputStream and represent same data as result InputStream.
    byte[] toByteArray()
    Gets the curent contents of this byte stream as a byte array.
    java.lang.String toString()
    Gets the curent contents of this byte stream as a string.
    java.lang.String toString​(java.lang.String enc)
    Gets the curent contents of this byte stream as a string using the specified encoding.
    void write​(byte[] b, int off, int len)
    Write the bytes to byte array.
    void write​(int b)
    Write a byte to byte array.
    int write​(java.io.InputStream in)
    Writes the entire contents of the specified input stream to this byte stream.
    void writeTo​(java.io.OutputStream out)
    Writes the entire contents of this byte stream to the specified output stream.

    Methods inherited from class java.io.OutputStream

    flush, nullOutputStream, write

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

  • Constructor Details

    • ByteArrayOutputStream

      public ByteArrayOutputStream()
      Creates a new byte array output stream. The buffer capacity is initially 1024 bytes, though its size increases if necessary.

    • ByteArrayOutputStream

      public ByteArrayOutputStream​(int size)
      Creates a new byte array output stream, with a buffer capacity of the specified size, in bytes.
      Parameters:
      size - the initial size
      Throws:
      java.lang.IllegalArgumentException - if size is negative

  • Method Details

    • write

      public void write​(byte[] b, int off, int len)
      Write the bytes to byte array.
      Overrides:
      write in class java.io.OutputStream
      Parameters:
      b - the bytes to write
      off - The start offset
      len - The number of bytes to write

    • write

      public void write​(int b)
      Write a byte to byte array.
      Specified by:
      write in class java.io.OutputStream
      Parameters:
      b - the byte to write

    • write

      public int write​(java.io.InputStream in) throws java.io.IOException
      Writes the entire contents of the specified input stream to this byte stream. Bytes from the input stream are read directly into the internal buffers of this streams.
      Parameters:
      in - the input stream to read from
      Returns:
      total number of bytes read from the input stream (and written to this stream)
      Throws:
      java.io.IOException - if an I/O error occurs while reading the input stream
      Since:
      Commons IO 1.4

    • size

      public int size()
      Return the current size of the byte array.
      Returns:
      the current size of the byte array

    • close

      public void close() throws java.io.IOException
      Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
      Specified by:
      close in interface java.lang.AutoCloseable
      Specified by:
      close in interface java.io.Closeable
      Overrides:
      close in class java.io.OutputStream
      Throws:
      java.io.IOException - never (this method should not declare this exception but it has to now due to backwards compatability)

    • reset

      public void reset()
      See Also:
      ByteArrayOutputStream.reset()

    • writeTo

      public void writeTo​(java.io.OutputStream out) throws java.io.IOException
      Writes the entire contents of this byte stream to the specified output stream.
      Parameters:
      out - the output stream to write to
      Throws:
      java.io.IOException - if an I/O error occurs, such as if the stream is closed
      See Also:
      ByteArrayOutputStream.writeTo(OutputStream)

    • toBufferedInputStream

      public static java.io.InputStream toBufferedInputStream​(java.io.InputStream input) throws java.io.IOException
      Fetches entire contents of an InputStream and represent same data as result InputStream.

      This method is useful where,

      • Source InputStream is slow.
      • It has network resources associated, so we cannot keep it open for long time.
      • It has network timeout associated.
      It can be used in favor of toByteArray(), since it avoids unnecessary allocation and copy of byte[].
      This method buffers the input internally, so there is no need to use a BufferedInputStream.
      Parameters:
      input - Stream to be fully buffered.
      Returns:
      A fully buffered stream.
      Throws:
      java.io.IOException - if an I/O error occurs
      Since:
      Commons IO 2.0

    • toByteArray

      public byte[] toByteArray()
      Gets the curent contents of this byte stream as a byte array. The result is independent of this stream.
      Returns:
      the current contents of this output stream, as a byte array
      See Also:
      ByteArrayOutputStream.toByteArray()

    • toString

      public java.lang.String toString()
      Gets the curent contents of this byte stream as a string.
      Overrides:
      toString in class java.lang.Object
      Returns:
      the contents of the byte array as a String
      See Also:
      ByteArrayOutputStream.toString()

    • toString

      public java.lang.String toString​(java.lang.String enc) throws java.io.UnsupportedEncodingException
      Gets the curent contents of this byte stream as a string using the specified encoding.
      Parameters:
      enc - the name of the character encoding
      Returns:
      the string converted from the byte array
      Throws:
      java.io.UnsupportedEncodingException - if the encoding is not supported
      See Also:
      ByteArrayOutputStream.toString(String)