Package com.tangosol.io

Interface WriteBuffer

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Interface Description
      static interface  WriteBuffer.BufferOutput
      The BufferOutput interface represents a DataOutputStream on top of a WriteBuffer.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      void clear()
      Set the length of the buffer as indicated by the length() method to zero.
      Object clone()
      Create a clone of this WriteBuffer object.
      WriteBuffer.BufferOutput getAppendingBufferOutput()
      Get a BufferOutput object to write data to this buffer.
      WriteBuffer.BufferOutput getBufferOutput()
      Get a BufferOutput object to write data to this buffer, starting at the beginning of the WriteBuffer.
      WriteBuffer.BufferOutput getBufferOutput​(int of)
      Get a BufferOutput object to write data to this buffer starting at a particular offset.
      int getCapacity()
      Determine the number of bytes that the buffer can hold without resizing itself.
      int getMaximumCapacity()
      Determine the maximum number of bytes that the buffer can hold.
      ReadBuffer getReadBuffer()
      Get a ReadBuffer object that is a snapshot of this WriteBuffer's data.
      ReadBuffer getUnsafeReadBuffer()
      Get a ReadBuffer object to read data from this buffer.
      WriteBuffer getWriteBuffer​(int of)
      Obtain a WriteBuffer starting at a particular offset within this WriteBuffer.
      WriteBuffer getWriteBuffer​(int of, int cb)
      Obtain a WriteBuffer for a portion of this WriteBuffer.
      int length()
      Determine the length of the data that is in the buffer.
      void retain​(int of)
      Starting with the byte at offset of, retain the remainder of this WriteBuffer, such that the byte at offset of is shifted to offset 0, the byte at offset of + 1 is shifted to offset 1, and so on up to the byte at offset length() - 1, which is shifted to offset length() - of - 1.
      void retain​(int of, int cb)
      Starting with the byte at offset of, retain cb bytes in this WriteBuffer, such that the byte at offset of is shifted to offset 0, the byte at offset of + 1 is shifted to offset 1, and so on up to the byte at offset of + cb - 1, which is shifted to offset cb - 1.
      Binary toBinary()
      Returns a new Binary object that holds the complete contents of this WriteBuffer.
      byte[] toByteArray()
      Returns a new byte array that holds the complete contents of this WriteBuffer.
      void write​(int ofDest, byte b)
      Store the specified byte at the specified offset within the buffer.
      void write​(int ofDest, byte[] abSrc)
      Store the specified bytes at the specified offset within the buffer.
      void write​(int ofDest, byte[] abSrc, int ofSrc, int cbSrc)
      Store the specified number of bytes from the specified location within the passed byte array at the specified offset within this buffer.
      void write​(int ofDest, InputStreaming stream)
      Store the remaining contents of the specified InputStreaming object at the specified offset within this buffer.
      void write​(int ofDest, InputStreaming stream, int cbSrc)
      Store the specified number of bytes from the specified InputStreaming object at the specified offset within this buffer.
      void write​(int ofDest, ReadBuffer bufSrc)
      Store the contents of the specified ReadBuffer at the specified offset within this buffer.
      void write​(int ofDest, ReadBuffer bufSrc, int ofSrc, int cbSrc)
      Store the specified portion of the contents of the specified ReadBuffer at the specified offset within this buffer.

    • Method Detail

      • write

        void write​(int ofDest,
           byte b)
        Store the specified byte at the specified offset within the buffer.

        For purposes of side-effects and potential exceptions, this method is functionally equivalent to the following code: 

        
 byte[] abSrc = new byte[1];
 abSrc[0] = b;
 write(ofDest, abSrc, 0, abSrc.length);

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        b - the byte to store in this buffer

      • write

        void write​(int ofDest,
           byte[] abSrc)
        Store the specified bytes at the specified offset within the buffer.

        For purposes of side-effects and potential exceptions, this method is functionally equivalent to the following code: 

        
 write(ofDest, abSrc, 0, abSrc.length);

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        abSrc - the array of bytes to store in this buffer
        Throws:
        NullPointerException - if abSrc is null
        IndexOutOfBoundsException - if ofDest is negative, or if ofDest + abSrc.length is greater than getMaximumCapacity()

      • write

        void write​(int ofDest,
           byte[] abSrc,
           int ofSrc,
           int cbSrc)
        Store the specified number of bytes from the specified location within the passed byte array at the specified offset within this buffer.

        As a result of this method, the buffer length as reported by the length() method will become Math.max(length(), ofDest + cbSrc).

        As a result of this method, the buffer capacity as reported by the getCapacity() method will not change if the new value returned by length() would not exceed the old value returned by getCapacity(); otherwise, the capacity will be increased such that getCapacity() >= length(). Regardless, it is always true that getCapacity() >= length() and getMaximumCapacity() >= getCapacity(). If the buffer capacity cannot be increased due to resource constraints, an undesignated Error or RuntimeException will be thrown, such as OutOfMemoryError.

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        abSrc - the array containing the bytes to store in this buffer
        ofSrc - the offset within the passed byte array to copy from
        cbSrc - the number of bytes to copy from the passed byte array
        Throws:
        NullPointerException - if abSrc is null
        IndexOutOfBoundsException - if ofDest, ofSrc or cbSrc is negative, if ofSrc + cbSrc is greater than abSrc.length, or if ofDest + cbSrc is greater than getMaximumCapacity()

      • write

        void write​(int ofDest,
           ReadBuffer bufSrc)
        Store the contents of the specified ReadBuffer at the specified offset within this buffer.

        For purposes of side-effects and potential exceptions, this method is functionally equivalent to the following code: 

        
 byte[] abSrc = bufSrc.toByteArray();
 write(ofDest, abSrc, 0, abSrc.length);

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        bufSrc - the array of bytes to store in this buffer
        Throws:
        NullPointerException - if bufSrc is null
        IndexOutOfBoundsException - if ofDest is negative, or if ofDest + bufSrc.length() is greater than getMaximumCapacity()

      • write

        void write​(int ofDest,
           ReadBuffer bufSrc,
           int ofSrc,
           int cbSrc)
        Store the specified portion of the contents of the specified ReadBuffer at the specified offset within this buffer.

        For purposes of side-effects and potential exceptions, this method is functionally equivalent to the following code: 

        
 byte[] abSrc = bufSrc.toByteArray(ofSrc, cbSrc);
 write(ofDest, abSrc, 0, abSrc.length);

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        bufSrc - the array of bytes to store in this buffer
        ofSrc - the offset within the passed ReadBuffer to copy from
        cbSrc - the number of bytes to copy from the passed ReadBuffer
        Throws:
        NullPointerException - if bufSrc is null
        IndexOutOfBoundsException - if ofDest, ofSrc or cbSrc is negative, if ofSrc + cbSrc is greater than bufSrc.length(), or if ofDest + cbSrc is greater than getMaximumCapacity()

      • write

        void write​(int ofDest,
           InputStreaming stream)
    throws IOException
        Store the remaining contents of the specified InputStreaming object at the specified offset within this buffer.

        For purposes of side-effects and potential exceptions, this method is functionally similar to the following code: 

        
 ByteArrayOutputStream streamOut = new ByteArrayOutputStream();
 int b;
 while ((b = stream.read()) >= 0)
     {
     streamOut.write(b);
     }
 byte[] abSrc = streamOut.toByteArray();
 write(ofDest, abSrc, 0, abSrc.length);

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        stream - the stream of bytes to read and store in this buffer
        Throws:
        IOException - if an IOException occurs reading from the passed stream

      • write

        void write​(int ofDest,
           InputStreaming stream,
           int cbSrc)
    throws IOException
        Store the specified number of bytes from the specified InputStreaming object at the specified offset within this buffer.

        For purposes of side-effects and potential exceptions, this method is functionally similar to the following code: 

        
 DataInputStream streamData = new DataInputStream(
         new WrapperInputStream(stream));
 byte[] abSrc = new byte[cbSrc];
 streamData.readFully(abSrc);
 write(ofDest, abSrc, 0, abSrc.length);

        Parameters:
        ofDest - the offset within this buffer to store the passed data
        stream - the stream of bytes to read and store in this buffer
        cbSrc - the exact number of bytes to read from the stream and put in this buffer
        Throws:
        IOException - if an IOException occurs reading from the passed stream

      • length

        int length()
        Determine the length of the data that is in the buffer. This is the actual number of bytes of data that have been written to the buffer, not the capacity of the buffer.
        Returns:
        the number of bytes of data represented by this WriteBuffer

      • retain

        void retain​(int of)
        Starting with the byte at offset of, retain the remainder of this WriteBuffer, such that the byte at offset of is shifted to offset 0, the byte at offset of + 1 is shifted to offset 1, and so on up to the byte at offset length() - 1, which is shifted to offset length() - of - 1. After this method, the length of of the buffer as indicated by the length() method will be equal to length() - of.

        This method is functionally equivalent to the following code: 

        
 retain(of, length() - of);

        Parameters:
        of - the offset of the first byte within the WriteBuffer that will be retained
        Throws:
        IndexOutOfBoundsException - if of is negative or if of is greater than length()

      • retain

        void retain​(int of,
            int cb)
        Starting with the byte at offset of, retain cb bytes in this WriteBuffer, such that the byte at offset of is shifted to offset 0, the byte at offset of + 1 is shifted to offset 1, and so on up to the byte at offset of + cb - 1, which is shifted to offset cb - 1. After this method, the length of the buffer as indicated by the length() method will be equal to cb.

        Legal values for the offset of the first byte to retain of are (of >= 0 && of <= length()). Legal values for the number of bytes to retain cb are (cb >= 0 && cb <= length()), such that (of + cb <= length()).

        If cb is zero, then this method will have the same effect as clear. If of is zero, then this method will have the effect of truncating the data in the buffer, but no bytes will be shifted within the buffer.

        The effect on the capacity of the buffer is implementation-specific; some implementations are expected to retain the same capacity while others are expected to shrink accordingly.

        Parameters:
        of - the offset of the first byte within the WriteBuffer that will be retained
        cb - the number of bytes to retain
        Throws:
        IndexOutOfBoundsException - if of or cb is negative of if of + cb is greater than length()

      • clear

        void clear()
        Set the length of the buffer as indicated by the length() method to zero.

        The effect on the capacity of the buffer is implementation-specific; some implementations are expected to retain the same capacity while others are expected to shrink accordingly.

      • getCapacity

        int getCapacity()
        Determine the number of bytes that the buffer can hold without resizing itself. In other words, a WriteBuffer has getCapacity() - length() bytes that can be written to it without overflowing the current underlying buffer allocation. Since the buffer is an abstract concept, the actual mechanism for the underlying buffer is not known, but it could be a Java NIO buffer, or a byte array, etc.

        Note that if the maximum size returned by getMaximumCapacity() is greater than the current size returned by this method, then the WriteBuffer will automatically resize itself to allocate more space when the amount of data written to it passes the current size.

        Returns:
        the number of bytes of data that this WriteBuffer can hold without resizing its underlying buffer

      • getMaximumCapacity

        int getMaximumCapacity()
        Determine the maximum number of bytes that the buffer can hold. If the maximum size is greater than the current size, then the buffer is expected to resize itself as necessary up to the maximum size in order to contain the data given to it.
        Returns:
        the maximum number of bytes of data that the WriteBuffer can hold

      • getWriteBuffer

        WriteBuffer getWriteBuffer​(int of)
        Obtain a WriteBuffer starting at a particular offset within this WriteBuffer.

        This is functionally equivalent to: 

        
 return getWriteBuffer(of, getMaximumCapacity() - of);

        Parameters:
        of - the beginning index, inclusive
        Returns:
        a WriteBuffer that represents a portion of this WriteBuffer
        Throws:
        IndexOutOfBoundsException - if of is negative, or of is larger than the getMaximumCapacity() of this WriteBuffer object

      • getWriteBuffer

        WriteBuffer getWriteBuffer​(int of,
                           int cb)
        Obtain a WriteBuffer for a portion of this WriteBuffer.

        Use of the resulting buffer will correspond to using this buffer directly but with the offset being passed to the buffer methods automatically having of added. As a result, the length of this buffer can be modified by writing to the new buffer; however, changes made directly to this buffer will not affect the length of the new buffer.

        Note that the resulting WriteBuffer is limited in the number of bytes that can be written to it; in other words, its getMaximumCapacity() must return the same value as was passed in cb.

        Parameters:
        of - the offset of the first byte within this WriteBuffer to map to offset 0 of the new WriteBuffer
        cb - the number of bytes to cover in the resulting WriteBuffer
        Returns:
        a WriteBuffer that represents a portion of this WriteBuffer
        Throws:
        IndexOutOfBoundsException - if of or cb is negative, or of + cb is larger than the getMaximumCapacity() of this WriteBuffer object

      • getBufferOutput

        WriteBuffer.BufferOutput getBufferOutput()
        Get a BufferOutput object to write data to this buffer, starting at the beginning of the WriteBuffer.

        This is functionally equivalent to: 

        
 return getBufferOutput(0);

        Returns:
        a BufferOutput that is writing to this buffer starting at offset zero

      • getBufferOutput

        WriteBuffer.BufferOutput getBufferOutput​(int of)
        Get a BufferOutput object to write data to this buffer starting at a particular offset.

        Note that each call to this method will return a new BufferOutput object, with the possible exception being that a zero-length non-resizing WriteBuffer could always return the same instance (since it is not writable).

        This is functionally equivalent to: 

        
 BufferOutput bufout = getBufferOutput();
 bufout.setOffset(of);
 return bufout;

        Parameters:
        of - the offset of the first byte of this buffer that the BufferOutput will write to
        Returns:
        a BufferOutput that will write to this buffer

      • getAppendingBufferOutput

        WriteBuffer.BufferOutput getAppendingBufferOutput()
        Get a BufferOutput object to write data to this buffer. The BufferOutput object returned by this method is set to append to the WriteBuffer, meaning that its offset is pre-set to the length() of this buffer.

        This is functionally equivalent to: 

        
 return getBufferOutput(length());

        Returns:
        a BufferOutput configured to append to this buffer

      • getReadBuffer

        ReadBuffer getReadBuffer()
        Get a ReadBuffer object that is a snapshot of this WriteBuffer's data.

        This method is functionally equivalent to the following code: 

        
 ReadBuffer buf = getUnsafeReadBuffer();
 byte[] ab = buf.toByteArray();
 return new ByteArrayReadBuffer(ab);

        Returns:
        a ReadBuffer that reflects the point-in-time contents of this WriteBuffer

      • getUnsafeReadBuffer

        ReadBuffer getUnsafeReadBuffer()
        Get a ReadBuffer object to read data from this buffer. This method is not guaranteed to return a snapshot of this buffer's data, nor is it guaranteed to return a live view of this buffer, which means that subsequent changes to this WriteBuffer may or may not affect the contents and / or the length of the returned ReadBuffer.

        To get a snapshot, use the getReadBuffer() method.

        Returns:
        a ReadBuffer that reflects the contents of this WriteBuffer but whose behavior is undefined if the WriteBuffer is modified

      • toByteArray

        byte[] toByteArray()
        Returns a new byte array that holds the complete contents of this WriteBuffer.

        This method is functionally equivalent to the following code: 

        
 return getUnsafeReadBuffer().toByteArray();

        Returns:
        the contents of this WriteBuffer as a byte[]

      • toBinary

        Binary toBinary()
        Returns a new Binary object that holds the complete contents of this WriteBuffer.

        This method is functionally equivalent to the following code: 

        
 return getUnsafeReadBuffer().toBinary();

        Returns:
        the contents of this WriteBuffer as a Binary object

      • clone

        Object clone()
        Create a clone of this WriteBuffer object. Changes to the clone will not affect the original, and vice-versa.
        Returns:
        a WriteBuffer object with the same contents as this WriteBuffer object