org.apache.commons.io.output

Class AbstractByteArrayOutputStream

  • All Implemented Interfaces:
    Closeable, Flushable, AutoCloseable
    Direct Known Subclasses:
    ByteArrayOutputStream, UnsynchronizedByteArrayOutputStream

    public abstract class AbstractByteArrayOutputStream
    extends 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
    • Field Detail

      • count

        protected int count
        The total count of bytes written.
    • Constructor Detail

      • AbstractByteArrayOutputStream

        public AbstractByteArrayOutputStream()
    • Method Detail

      • needNewBuffer

        protected void needNewBuffer(int newcount)
        Makes a new buffer available either by allocating a new one or re-cycling an existing one.
        Parameters:
        newcount - the size of the buffer if one is created
      • write

        public abstract void write(byte[] b,
                                   int off,
                                   int len)
        Writes the bytes to the byte array.
        Overrides:
        write in class  OutputStream
        Parameters:
        b - the bytes to write
        off - The start offset
        len - The number of bytes to write
      • writeImpl

        protected void writeImpl(byte[] b,
                                 int off,
                                 int len)
        Writes the bytes to the byte array.
        Parameters:
        b - the bytes to write
        off - The start offset
        len - The number of bytes to write
      • write

        public abstract void write(int b)
        Write a byte to byte array.
        Specified by:
        write in class  OutputStream
        Parameters:
        b - the byte to write
      • writeImpl

        protected void writeImpl(int b)
        Write a byte to byte array.
        Parameters:
        b - the byte to write
      • write

        public abstract int write(InputStream in)
                           throws 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:
        IOException - if an I/O error occurs while reading the input stream
        Since:
        1.4
      • writeImpl

        protected int writeImpl(InputStream in)
                         throws 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:
        IOException - if an I/O error occurs while reading the input stream
        Since:
        2.7
      • size

        public abstract int size()
        Returns the current size of the byte array.
        Returns:
        the current size of the byte array
      • close

        public void close()
                   throws 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  Closeable
        Specified by:
        close in interface  AutoCloseable
        Overrides:
        close in class  OutputStream
        Throws:
        IOException - never (this method should not declare this exception but it has to now due to backwards compatibility)
      • toInputStream

        public abstract InputStream toInputStream()
        Gets the current contents of this byte stream as a 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()
      • 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()
      • toByteArrayImpl

        protected byte[] toByteArrayImpl()
        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()
      • toString

        public String toString(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)

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