| java.lang.Object
 com.quadcap.sql.file.BlockPath
| BlockPath | | class BlockPath (Code) | | This class is used to locate a specified offset within a randomly
accessible BlockAccess object. The path has two
components, a logical component, p which specifies the offsets of the
block references needed to locate the block and position corresponding
to the selected byte, and a physical component r which contains
the block references of the blocks needed to locate the actual byte.
author:
Stan Bailes |
| Constructor Summary | |
| public | BlockPath(BlockAccess a, long pos)
Construct a new BlockPath to represent the specified byte in the
specified region. |
| Method Summary | |
| final public int | getBufPos()
Return the byte offset within the leaf block where the designated
byte can be found. | | final public int | getDepth()
| | final public Page | getLeafBlock()
Return the block which actually contains the data. | | final public long | getPos()
| | final public void | incr(long offset)
Adjust this BlockPath to point to a new location, with a minimum
number of block accesses. | | final public void | setPos(long newpos)
| | public String | toString()
For debugging, return a displayable representation of this BlockPath. |
| depth | | int depth(Code) | | Depth of this path
|
| pos | | long pos(Code) | | Byte offset info 'a'
|
| tp | | int[] tp(Code) | | A temporary (logical) path
|
| BlockPath | | public BlockPath(BlockAccess a, long pos) throws IOException(Code) | | Construct a new BlockPath to represent the specified byte in the
specified region.
Parameters:
a - the region into which the index is made
Parameters:
pos - the byte offset in the region |
| getBufPos | | final public int getBufPos()(Code) | | Return the byte offset within the leaf block where the designated
byte can be found.
|
| getDepth | | final public int getDepth()(Code) | | Return the depth of this path
|
| getLeafBlock | | final public Page getLeafBlock() throws IOException(Code) | | Return the block which actually contains the data. This is the
final block in the path.
NOTE: This block needs to have its reference count decremented
when you're done with it!!
|
| getPos | | final public long getPos()(Code) | | Return the current position referred to by this path
|
| incr | | final public void incr(long offset) throws IOException(Code) | | Adjust this BlockPath to point to a new location, with a minimum
number of block accesses.
Parameters:
cnt - The offset from the current location |
| setPos | | final public void setPos(long newpos) throws IOException(Code) | | Return the current position referred to by this path
|
| toString | | public String toString()(Code) | | For debugging, return a displayable representation of this BlockPath.
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