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java.lang.Objectjdbm.recman.BlockIo
public final class BlockIo
This class wraps a page-sized byte array and provides methods to read and write data to and from it. The readers and writers are just the ones that the rest of the toolkit needs, nothing else. Values written are compatible with java.io routines.
DataInput
,
DataOutput
,
Serialized FormField Summary | |
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static long |
serialVersionUID
|
Constructor Summary | |
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BlockIo()
Default constructor for serialization |
|
BlockIo(long blockId,
byte[] data)
Constructs a new BlockIo instance working on the indicated buffer. |
Method Summary | |
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(package private) void |
decrementTransactionCount()
Decrements transaction count for this block, to signal that this block has been written from the log to the data file. |
(package private) long |
getBlockId()
Returns the block number. |
(package private) byte[] |
getData()
Returns the underlying array |
BlockView |
getView()
Returns the current view of the block. |
(package private) void |
incrementTransactionCount()
Increments transaction count for this block, to signal that this block is in the log but not yet in the data file. |
(package private) boolean |
isDirty()
Returns true if the dirty flag is set. |
(package private) boolean |
isInTransaction()
Returns true if the block is still dirty with respect to the transaction log. |
byte |
readByte(int pos)
Reads a byte from the indicated position |
void |
readExternal(java.io.ObjectInput in)
|
int |
readInt(int pos)
Reads an int from the indicated position |
long |
readLong(int pos)
Reads a long from the indicated position |
short |
readShort(int pos)
Reads a short from the indicated position |
(package private) void |
setBlockId(long id)
Sets the block number. |
(package private) void |
setClean()
Clears the dirty flag |
(package private) void |
setDirty()
Sets the dirty flag |
void |
setView(BlockView view)
Sets the current view of the block. |
java.lang.String |
toString()
|
void |
writeByte(int pos,
byte value)
Writes a byte to the indicated position |
void |
writeExternal(java.io.ObjectOutput out)
|
void |
writeInt(int pos,
int value)
Writes an int to the indicated position |
void |
writeLong(int pos,
long value)
Writes a long to the indicated position |
void |
writeShort(int pos,
short value)
Writes a short to the indicated position |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final long serialVersionUID
Constructor Detail |
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public BlockIo()
BlockIo(long blockId, byte[] data)
Method Detail |
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byte[] getData()
void setBlockId(long id)
long getBlockId()
public BlockView getView()
public void setView(BlockView view)
void setDirty()
void setClean()
boolean isDirty()
boolean isInTransaction()
void incrementTransactionCount()
void decrementTransactionCount()
public byte readByte(int pos)
public void writeByte(int pos, byte value)
public short readShort(int pos)
public void writeShort(int pos, short value)
public int readInt(int pos)
public void writeInt(int pos, int value)
public long readLong(int pos)
public void writeLong(int pos, long value)
public java.lang.String toString()
toString
in class java.lang.Object
public void readExternal(java.io.ObjectInput in) throws java.io.IOException, java.lang.ClassNotFoundException
readExternal
in interface java.io.Externalizable
java.io.IOException
java.lang.ClassNotFoundException
public void writeExternal(java.io.ObjectOutput out) throws java.io.IOException
writeExternal
in interface java.io.Externalizable
java.io.IOException
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