Package com.tangosol.io

Class 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

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      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.
      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.

    • Field Detail

      • m_cb

        protected int m_cb
        The byte count.

    • Constructor Detail

      • SizeEstimatingBufferOutput

        public SizeEstimatingBufferOutput()

    • Method Detail

      • 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

      • 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,
                        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:
        EOFException - if the stream is exhausted before the number of bytes indicated could be read
        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