Package com.tangosol.io

Class SizeEstimatingBufferOutput

java.lang.Object
com.tangosol.io.SizeEstimatingBufferOutput
All Implemented Interfaces:
com.oracle.coherence.common.io.OutputStreaming, OutputStreaming, WriteBuffer.BufferOutput, DataOutput
public class SizeEstimatingBufferOutput extends Object implements WriteBuffer.BufferOutput
SizeEstimatingBufferOutput is a WriteBuffer.BufferOutput implementation which writes nothing, and simply maintains an estimated byte count of how much would have been written.
Since:
Coherence 12.1.3
Author:
mf 2013.05.16

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected int
    m_cb
    The byte count.

    Fields inherited from interface com.tangosol.io.WriteBuffer.BufferOutput

    MAX_PACKED_INT_SIZE, MAX_PACKED_LONG_SIZE

  • Constructor Summary

    Constructors
    Constructor
    Description
    SizeEstimatingBufferOutput()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    close()
    Close the OutputStream and release any system resources associated with it.
    void
    flush()
    Flushes this OutputStream and forces any buffered output bytes to be written.
    WriteBuffer
    getBuffer()
    Get the WriteBuffer object that this BufferOutput is writing to.
    ByteBuffer
    getByteBuffer(int cb)
    Ensure that there are at least cb bytes of capacity left in this WriteBuffer.BufferOutput, and return a mutable ByteBuffer of cb bytes, starting at the current offset.
    int
    getOffset()
    Determine the current offset of this BufferOutput within the underlying WriteBuffer.
    void
    setOffset(int of)
    Specify the offset of the next byte to write to the underlying WriteBuffer.
    void
    write(byte[] ab)
    Writes all the bytes in the array ab.
    void
    write(byte[] ab, int of, int cb)
    Writes cb bytes starting at offset of from the array ab.
    void
    write(int b)
    Writes the eight low-order bits of the argument b.
    void
    writeBoolean(boolean f)
    Writes the boolean value f.
    void
    writeBuffer(ReadBuffer buf)
    Write all the bytes from the passed ReadBuffer object.
    void
    writeBuffer(ReadBuffer buf, int of, int cb)
    Write cb bytes from the passed ReadBuffer object starting at offset of within the passed ReadBuffer.
    void
    writeByte(int b)
    Writes the eight low-order bits of the argument b.
    void
    writeBytes(String s)
    Writes the String s, but only the low-order byte from each character of the String is written.
    void
    writeChar(int ch)
    Writes a char value, comprised of the 16 low-order bits of the argument ch; the 16 high-order bits of ch are ignored.
    void
    writeChars(String s)
    Writes the String s as a sequence of characters.
    void
    writeDouble(double dfl)
    Writes a double value.
    void
    writeFloat(float fl)
    Writes a float value.
    void
    writeInt(int n)
    Writes an int value.
    void
    writeLong(long l)
    Writes a long value.
    void
    writePackedInt(int n)
    Write an int value using a variable-length storage-format.
    void
    writePackedLong(long l)
    Write a long value using a variable-length storage-format.
    void
    writeSafeUTF(String s)
    Write a variable-length encoded UTF packed String.
    void
    writeShort(int n)
    Writes a short value, comprised of the 16 low-order bits of the argument n; the 16 high-order bits of n are ignored.
    void
    writeStream(InputStreaming stream)
    Write the remaining contents of the specified InputStreaming object.
    void
    writeStream(InputStreaming stream, int cb)
    Write the specified number of bytes of the specified InputStreaming object.
    void
    writeUTF(String s)
    Writes the String s as a sequence of characters, but using UTF-8 encoding for the characters, and including the String length data so that the corresponding DataInput.readUTF() method can reconstitute a String from the written data.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • m_cb

      protected int m_cb
      The byte count.

  • Constructor Details

    • SizeEstimatingBufferOutput

      public SizeEstimatingBufferOutput()

  • Method Details

    • write

      public void write(int b) throws IOException
      Description copied from interface: com.oracle.coherence.common.io.OutputStreaming
      Writes the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.
      Specified by:
      write in interface DataOutput
      Specified by:
      write in interface com.oracle.coherence.common.io.OutputStreaming
      Parameters:
      b - the byte to write (passed as an integer)
      Throws:
      IOException - if an I/O error occurs

    • write

      public void write(byte[] ab) throws IOException
      Description copied from interface: com.oracle.coherence.common.io.OutputStreaming
      Writes all the bytes in the array ab.
      Specified by:
      write in interface DataOutput
      Specified by:
      write in interface com.oracle.coherence.common.io.OutputStreaming
      Parameters:
      ab - the byte array to write
      Throws:
      IOException - if an I/O error occurs

    • write

      public void write(byte[] ab, int of, int cb) throws IOException
      Description copied from interface: com.oracle.coherence.common.io.OutputStreaming
      Writes cb bytes starting at offset of from the array ab.
      Specified by:
      write in interface DataOutput
      Specified by:
      write in interface com.oracle.coherence.common.io.OutputStreaming
      Parameters:
      ab - the byte array to write from
      of - the offset into ab to start writing from
      cb - the number of bytes from ab to write
      Throws:
      IOException - if an I/O error occurs

    • flush

      public void flush() throws IOException
      Description copied from interface: com.oracle.coherence.common.io.OutputStreaming
      Flushes this OutputStream and forces any buffered output bytes to be written.
      Specified by:
      flush in interface com.oracle.coherence.common.io.OutputStreaming
      Throws:
      IOException - if an I/O error occurs

    • close

      public void close() throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Close the OutputStream and release any system resources associated with it.

      BufferOutput implementations do not pass this call down onto an underlying stream, if any.

      Specified by:
      close in interface com.oracle.coherence.common.io.OutputStreaming
      Specified by:
      close in interface WriteBuffer.BufferOutput
      Throws:
      IOException - if an I/O error occurs

    • writeBoolean

      public void writeBoolean(boolean f) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes the boolean value f.
      Specified by:
      writeBoolean in interface DataOutput
      Specified by:
      writeBoolean in interface WriteBuffer.BufferOutput
      Parameters:
      f - the boolean to be written
      Throws:
      IOException - if an I/O error occurs

    • writeByte

      public void writeByte(int b) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.
      Specified by:
      writeByte in interface DataOutput
      Specified by:
      writeByte in interface WriteBuffer.BufferOutput
      Parameters:
      b - the byte to write (passed as an integer)
      Throws:
      IOException - if an I/O error occurs

    • writeShort

      public void writeShort(int n) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes a short value, comprised of the 16 low-order bits of the argument n; the 16 high-order bits of n are ignored.
      Specified by:
      writeShort in interface DataOutput
      Specified by:
      writeShort in interface WriteBuffer.BufferOutput
      Parameters:
      n - the short to write (passed as an integer)
      Throws:
      IOException - if an I/O error occurs

    • writeChar

      public void writeChar(int ch) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes a char value, comprised of the 16 low-order bits of the argument ch; the 16 high-order bits of ch are ignored.
      Specified by:
      writeChar in interface DataOutput
      Specified by:
      writeChar in interface WriteBuffer.BufferOutput
      Parameters:
      ch - the char to write (passed as an integer)
      Throws:
      IOException - if an I/O error occurs

    • writeInt

      public void writeInt(int n) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes an int value.
      Specified by:
      writeInt in interface DataOutput
      Specified by:
      writeInt in interface WriteBuffer.BufferOutput
      Parameters:
      n - the int to write
      Throws:
      IOException - if an I/O error occurs

    • writeLong

      public void writeLong(long l) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes a long value.
      Specified by:
      writeLong in interface DataOutput
      Specified by:
      writeLong in interface WriteBuffer.BufferOutput
      Parameters:
      l - the long to write
      Throws:
      IOException - if an I/O error occurs

    • writeFloat

      public void writeFloat(float fl) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes a float value.
      Specified by:
      writeFloat in interface DataOutput
      Specified by:
      writeFloat in interface WriteBuffer.BufferOutput
      Parameters:
      fl - the float to write
      Throws:
      IOException - if an I/O error occurs

    • writeDouble

      public void writeDouble(double dfl) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes a double value.
      Specified by:
      writeDouble in interface DataOutput
      Specified by:
      writeDouble in interface WriteBuffer.BufferOutput
      Parameters:
      dfl - the double to write
      Throws:
      IOException - if an I/O error occurs

    • writeBytes

      public void writeBytes(String s) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes the String s, but only the low-order byte from each character of the String is written.
      Specified by:
      writeBytes in interface DataOutput
      Specified by:
      writeBytes in interface WriteBuffer.BufferOutput
      Parameters:
      s - the String to write
      Throws:
      IOException - if an I/O error occurs

    • writeChars

      public void writeChars(String s) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes the String s as a sequence of characters.
      Specified by:
      writeChars in interface DataOutput
      Specified by:
      writeChars in interface WriteBuffer.BufferOutput
      Parameters:
      s - the String to write
      Throws:
      IOException - if an I/O error occurs

    • writeUTF

      public void writeUTF(String s) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Writes the String s as a sequence of characters, but using UTF-8 encoding for the characters, and including the String length data so that the corresponding DataInput.readUTF() method can reconstitute a String from the written data.
      Specified by:
      writeUTF in interface DataOutput
      Specified by:
      writeUTF in interface WriteBuffer.BufferOutput
      Parameters:
      s - the String to write
      Throws:
      IOException - if an I/O error occurs

    • getBuffer

      public WriteBuffer getBuffer()
      Description copied from interface: WriteBuffer.BufferOutput
      Get the WriteBuffer object that this BufferOutput is writing to.
      Specified by:
      getBuffer in interface WriteBuffer.BufferOutput
      Returns:
      the underlying WriteBuffer object

    • getByteBuffer

      public ByteBuffer getByteBuffer(int cb)
      Description copied from interface: WriteBuffer.BufferOutput
      Ensure that there are at least cb bytes of capacity left in this WriteBuffer.BufferOutput, and return a mutable ByteBuffer of cb bytes, starting at the current offset.
      Specified by:
      getByteBuffer in interface WriteBuffer.BufferOutput
      Parameters:
      cb - the size of the ByteBuffer to return
      Returns:
      a mutable ByteBuffer of cb bytes, starting at the current offset

    • writeSafeUTF

      public void writeSafeUTF(String s) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write a variable-length encoded UTF packed String. The major differences between this implementation and DataOutput is that this implementation supports null values and is not limited to 64KB UTF-encoded values.

      The binary format for a Safe UTF value is a "packed int" for the binary length followed by the UTF-encoded byte stream. The length is either -1 (indicating a null String) or in the range 0 .. Integer.MAX_VALUE (inclusive). The UTF-encoded portion uses a format identical to DataOutput.

      Specified by:
      writeSafeUTF in interface WriteBuffer.BufferOutput
      Parameters:
      s - a String value to write; may be null
      Throws:
      IOException - if an I/O error occurs

    • writePackedInt

      public void writePackedInt(int n) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write an int value using a variable-length storage-format.

      The format differs from DataOutput in that DataOutput always uses a fixed-length 4-byte Big Endian binary format for int values. The "packed" format includes a sign bit (0x40) and a continuation bit (0x80) in the first byte, followed by the least 6 significant bits of the int value. Subsequent bytes (each appearing only if the previous byte had its continuation bit set) include a continuation bit (0x80) and the next least 7 significant bits of the int value. In this way, a 32-bit value is encoded into 1-5 bytes, depending on the magnitude of the int value being encoded.

      Specified by:
      writePackedInt in interface WriteBuffer.BufferOutput
      Parameters:
      n - an int value to write
      Throws:
      IOException - if an I/O error occurs

    • writePackedLong

      public void writePackedLong(long l) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write a long value using a variable-length storage-format.

      The format differs from DataOutput in that DataOutput always uses a fixed-length 8-byte Big Endian binary format for long values. The "packed" format includes a sign bit (0x40) and a continuation bit (0x80) in the first byte, followed by the least 6 significant bits of the long value. Subsequent bytes (each appearing only if the previous byte had its continuation bit set) include a continuation bit (0x80) and the next least 7 significant bits of the long value. In this way, a 64-bit value is encoded into 1-10 bytes, depending on the magnitude of the long value being encoded.

      Specified by:
      writePackedLong in interface WriteBuffer.BufferOutput
      Parameters:
      l - a long value to write
      Throws:
      IOException - if an I/O error occurs

    • writeBuffer

      public void writeBuffer(ReadBuffer buf) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write all the bytes from the passed ReadBuffer object.

      This is functionally equivalent to the following code: 

      
 getBuffer().write(getOffset(), buf);
      Specified by:
      writeBuffer in interface WriteBuffer.BufferOutput
      Parameters:
      buf - a ReadBuffer object
      Throws:
      IOException - if an I/O error occurs

    • writeBuffer

      public void writeBuffer(ReadBuffer buf, int of, int cb) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write cb bytes from the passed ReadBuffer object starting at offset of within the passed ReadBuffer.

      This is functionally equivalent to the following code: 

      
 getBuffer().write(getOffset(), buf, of, cb);
      Specified by:
      writeBuffer in interface WriteBuffer.BufferOutput
      Parameters:
      buf - a ReadBuffer object
      of - the offset within the ReadBuffer of the first byte to write to this BufferOutput
      cb - the number of bytes to write
      Throws:
      IOException - if an I/O error occurs

    • writeStream

      public void writeStream(InputStreaming stream) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write the remaining contents of the specified InputStreaming object.

      This is functionally equivalent to the following code: 

      
 getBuffer().write(getOffset(), stream);
      Specified by:
      writeStream in interface WriteBuffer.BufferOutput
      Parameters:
      stream - the stream of bytes to write to this BufferOutput
      Throws:
      IOException - if an I/O error occurs, specifically if an IOException occurs reading from the passed stream

    • writeStream

      public void writeStream(InputStreaming stream, int cb) throws IOException
      Description copied from interface: WriteBuffer.BufferOutput
      Write the specified number of bytes of the specified InputStreaming object.

      This is functionally equivalent to the following code: 

      
 getBuffer().write(getOffset(), stream, cb);
      Specified by:
      writeStream in interface WriteBuffer.BufferOutput
      Parameters:
      stream - the stream of bytes to write to this BufferOutput
      cb - the exact number of bytes to read from the stream and write to this BufferOutput
      Throws:
      IOException - if an I/O error occurs, specifically if an IOException occurs reading from the passed stream

    • getOffset

      public int getOffset()
      Description copied from interface: WriteBuffer.BufferOutput
      Determine the current offset of this BufferOutput within the underlying WriteBuffer.
      Specified by:
      getOffset in interface WriteBuffer.BufferOutput
      Returns:
      the offset of the next byte to write to the WriteBuffer

    • setOffset

      public void setOffset(int of)
      Description copied from interface: WriteBuffer.BufferOutput
      Specify the offset of the next byte to write to the underlying WriteBuffer.
      Specified by:
      setOffset in interface WriteBuffer.BufferOutput
      Parameters:
      of - the offset of the next byte to write to the WriteBuffer