Java Doc for ByteHolder.java in » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » store » raw » data » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.store.raw.data

Source Cross Reference

Class Diagram

Java Document (Java Doc)

org.apache.derby.impl.store.raw.data .ByteHolder

All known Subclasses:   org.apache.derby.impl.store.raw.data .MemByteHolder,
ByteHolder
public interface ByteHolder (Code)
Holder for a growing sequence of bytes. The ByteHolder supports a writing phase in which a caller appends bytes to the ByteHolder. Later the caller may read the bytes out of the ByteHolder in the order they were written.

Method Summary
public int available()
     Return the number of bytes that can be read from this ByteHolder without blocking on an IO.
public void clear()
     Clear the bytes from the ByteHolder and place it in writing mode.
public int numBytesSaved()
     Return the number of bytes that have been saved to this byte holder.
public int read()
     Read a byte from this ByteHolder.
public int read(byte b, int off, int len)
     Read up to 'len' bytes from this ByteHolder and store them in an array at offset 'off'.
public int read(OutputStream out, int len)
     Read from the ByteHolder.
public int shiftToFront()

public long skip(long count)
     Skip over the specified number of bytes in a ByteHolder.
public void startReading()
     Place a ByteHolder in reading mode.
public void write(int b)
     Write a byte to this ByteHolder.
public void write(byte[] data, int offset, int len)
     Write len bytes of data starting at 'offset' to this ByteHolder.
public long write(InputStream in, long count)
     Write up to count bytes from an input stream to this ByteHolder.
public boolean writingMode()
     Return true if this is in writing mode.

Method Detail
available
public int available() throws IOException(Code)
Return the number of bytes that can be read from this ByteHolder without blocking on an IO.

clear
public void clear() throws IOException(Code)
Clear the bytes from the ByteHolder and place it in writing mode. This may not free the memory the ByteHolder uses to store data.

numBytesSaved
public int numBytesSaved() throws IOException(Code)
Return the number of bytes that have been saved to this byte holder. This result is different from available() as it is unaffected by the current read position on the ByteHolder.

read
public int read() throws IOException(Code)
Read a byte from this ByteHolder.
The ByteHolder must be in reading mode to call this. The byte or -1 if there are no bytes available.

read
public int read(byte b, int off, int len) throws IOException(Code)
Read up to 'len' bytes from this ByteHolder and store them in an array at offset 'off'.
The ByteHolder must be in reading mode to call this. the number of bytes read or -1 if the this ByteHolderhas no more bytes.

read
public int read(OutputStream out, int len) throws IOException(Code)
Read from the ByteHolder.
Read up to 'len' bytes from this ByteHolder and write them to the OutputStream
The ByteHolder must be in reading mode to call this. the number of bytes read or -1 if the this ByteHolderhas no more bytes.

shiftToFront
public int shiftToFront() throws IOException(Code)
shift the remaining unread bytes to the beginning of the byte holder

skip
public long skip(long count) throws IOException(Code)
Skip over the specified number of bytes in a ByteHolder.

startReading
public void startReading() throws IOException(Code)
Place a ByteHolder in reading mode. After this call, reads scan bytes sequentially in the order they were written to the ByteHolder starting from the first byte. When the ByteHolder is already in readmode this simply arranges for reads to start at the beginning of the sequence of saved bytes.

write
public void write(int b) throws IOException(Code)
Write a byte to this ByteHolder.
The ByteHolder must be in writing mode to call this.

write
public void write(byte[] data, int offset, int len) throws IOException(Code)
Write len bytes of data starting at 'offset' to this ByteHolder.
The ByteHolder must be in writing mode to call this.

write
public long write(InputStream in, long count) throws IOException(Code)
Write up to count bytes from an input stream to this ByteHolder. This may write fewer bytes if it encounters an end of file on the input stream. the number of bytes written.
exception:
  IOException - thrown when reading in causes anerror.

writingMode
public boolean writingMode()(Code)
Return true if this is in writing mode.

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