| java.lang.Object
 jdbm.recman.FileHeader
| FileHeader | | class FileHeader implements BlockView(Code) | | This class represents a file header. It is a 1:1 representation of
the data that appears in block 0 of a file.
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| Field Summary | |
| final static int | NROOTS
The number of "root" rowids available in the file. |
| Constructor Summary | |
| | FileHeader(BlockIo block, boolean isNew)
Constructs a FileHeader object from a block. |
| NROOTS | | final static int NROOTS(Code) | | The number of "root" rowids available in the file.
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| FileHeader | | FileHeader(BlockIo block, boolean isNew)(Code) | | Constructs a FileHeader object from a block.
Parameters:
block - The block that contains the file header
Parameters:
isNew - If true, the file header is for a new file.
throws:
IOException - if the block is too short to keep the fileheader. |
| getFirstOf | | long getFirstOf(int list)(Code) | | Returns the first block of the indicated list
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| getLastOf | | long getLastOf(int list)(Code) | | Returns the last block of the indicated list
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| getRoot | | long getRoot(int root)(Code) | | Returns the indicated root rowid. A root rowid is a special rowid
that needs to be kept between sessions. It could conceivably be
stored in a special file, but as a large amount of space in the
block header is wasted anyway, it's more useful to store it where
it belongs.
See Also: FileHeader.NROOTS |
| setFirstOf | | void setFirstOf(int list, long value)(Code) | | Sets the first block of the indicated list
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| setLastOf | | void setLastOf(int list, long value)(Code) | | Sets the last block of the indicated list
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