org.apache.commons.io.output

Class AbstractByteArrayOutputStream

java.lang.Object

java.io.OutputStream

org.apache.commons.io.output.AbstractByteArrayOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

Direct Known Subclasses:

ByteArrayOutputStream, UnsynchronizedByteArrayOutputStream

public abstract class AbstractByteArrayOutputStream
extends java.io.OutputStream

This is the base class for implementing 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 an AbstractByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

This is the base for an alternative implementation of the ByteArrayOutputStream class. The original implementation only allocates 32 bytes at the beginning. As this class is designed for heavy duty it starts at 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 ByteArrayOutputStream.toString(int) method that has been ignored.

Since:

2.7

Constructor Summary

Constructors

Constructor and Description
AbstractByteArrayOutputStream()

Method Summary

Modifier and Type	Method and Description
void	close() Does nothing.
abstract void	reset()
abstract int	size() Returns the current size of the byte array.
abstract byte[]	toByteArray() Gets the current contents of this byte stream as a byte array.
abstract java.io.InputStream	toInputStream() Gets the current contents of this byte stream as an Input Stream.
java.lang.String	toString() Deprecated. 2.5 use toString(String) instead
java.lang.String	toString(java.nio.charset.Charset charset) Gets the current contents of this byte stream as a string using the specified encoding.
java.lang.String	toString(java.lang.String enc) Gets the current contents of this byte stream as a string using the specified encoding.
abstract void	write(byte[] b, int off, int len)
abstract int	write(java.io.InputStream in) Writes the entire contents of the specified input stream to this byte stream.
abstract void	write(int b)
abstract 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, write

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AbstractByteArrayOutputStream

public AbstractByteArrayOutputStream()

Method Detail

close

public void close()
           throws java.io.IOException

Does nothing. The methods in this class can be called after the stream has been closed without generating an IOException.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

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 compatibility)

reset

public abstract void reset()

See Also:

ByteArrayOutputStream.reset()

size

public abstract int size()

Returns the current size of the byte array.

Returns:

the current size of the byte array

toByteArray

public abstract byte[] toByteArray()

Gets the current 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()

toInputStream

public abstract java.io.InputStream toInputStream()

Gets the current contents of this byte stream as an Input Stream. The returned stream is backed by buffers of this stream, avoiding memory allocation and copy, thus saving space and time.

Returns:

the current contents of this output stream.

Since:

2.5

See Also:

ByteArrayOutputStream.toByteArray(), reset()

toString

@Deprecated
public java.lang.String toString()

Deprecated. 2.5 use toString(String) instead

Gets the current contents of this byte stream as a string using the platform default charset.

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.nio.charset.Charset charset)

Gets the current contents of this byte stream as a string using the specified encoding.

Parameters:

charset - the character encoding

Returns:

the string converted from the byte array

Since:

2.5

See Also:

ByteArrayOutputStream.toString(String)

toString

public java.lang.String toString(java.lang.String enc)
                          throws java.io.UnsupportedEncodingException

Gets the current 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)

write

public abstract void write(byte[] b,
                           int off,
                           int len)

Overrides:

write in class java.io.OutputStream

write

public abstract 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 buffer of this stream.

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:

1.4

write

public abstract void write(int b)

Specified by:

write in class java.io.OutputStream

writeTo

public abstract 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)