? AbstractByteArrayOutputStream

java.lang.Object
java.io.OutputStream
org.apache.commons.io.output.AbstractByteArrayOutputStream
????????:
Closeable, Flushable, AutoCloseable
??????:
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 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 ByteArrayOutputStream.toString(int) method that has been ignored.

???????:
2.7
  • ??????

    • count

      protected int count
      The total count of bytes written.
  • ???????

  • ??????

    • needNewBuffer

      protected void needNewBuffer(int newcount)
      Makes a new buffer available either by allocating a new one or re-cycling an existing one.
      ??:
      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.
      ??:
      write ??? OutputStream
      ??:
      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.
      ??:
      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.
      ???:
      write ??? OutputStream
      ??:
      b - the byte to write
    • writeImpl

      protected void writeImpl(int b)
      Write a byte to byte array.
      ??:
      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.
      ??:
      in - the input stream to read from
      ??:
      total number of bytes read from the input stream (and written to this stream)
      ??:
      IOException - if an I/O error occurs while reading the input stream
      ???????:
      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.
      ??:
      in - the input stream to read from
      ??:
      total number of bytes read from the input stream (and written to this stream)
      ??:
      IOException - if an I/O error occurs while reading the input stream
      ???????:
      2.7
    • size

      public abstract int size()
      Returns the current size of the byte array.
      ??:
      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.
      ???:
      close ???? AutoCloseable
      ???:
      close ???? Closeable
      ??:
      close ??? OutputStream
      ??:
      IOException - never (this method should not declare this exception but it has to now due to backwards compatibility)
    • reset

      public abstract void reset()
      ????:
    • resetImpl

      protected void resetImpl()
      ????:
    • writeTo

      public abstract void writeTo(OutputStream out) throws IOException
      Writes the entire contents of this byte stream to the specified output stream.
      ??:
      out - the output stream to write to
      ??:
      IOException - if an I/O error occurs, such as if the stream is closed
      ????:
    • writeToImpl

      protected void writeToImpl(OutputStream out) throws IOException
      Writes the entire contents of this byte stream to the specified output stream.
      ??:
      out - the output stream to write to
      ??:
      IOException - if an I/O error occurs, such as if the stream is closed
      ????:
    • 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.
      ??:
      the current contents of this output stream.
      ???????:
      2.5
      ????:
    • 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.
      ????:
      T - the type of the InputStream which makes up the SequenceInputStream.
      ??:
      isConstructor - A constructor for an InputStream which makes up the SequenceInputStream.
      ??:
      the current contents of this output stream.
      ???????:
      2.7
      ????:
    • toByteArray

      public abstract byte[] toByteArray()
      Gets the current contents of this byte stream as a byte array. The result is independent of this stream.
      ??:
      the current contents of this output stream, as a byte array
      ????:
    • toByteArrayImpl

      protected byte[] toByteArrayImpl()
      Gets the current contents of this byte stream as a byte array. The result is independent of this stream.
      ??:
      the current contents of this output stream, as a byte array
      ????:
    • toString

      ????
      2.5 use toString(String) instead
      Gets the current contents of this byte stream as a string using the platform default charset.
      ??:
      toString ??? Object
      ??:
      the contents of the byte array as a String
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    • toString

      Gets the current contents of this byte stream as a string using the specified encoding.
      ??:
      enc - the name of the character encoding
      ??:
      the string converted from the byte array
      ??:
      UnsupportedEncodingException - if the encoding is not supported
      ????:
    • toString

      public String toString(Charset charset)
      Gets the current contents of this byte stream as a string using the specified encoding.
      ??:
      charset - the character encoding
      ??:
      the string converted from the byte array
      ???????:
      2.5
      ????: