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java.lang.Objectorg.h2.store.Data
public class Data
This class represents a byte buffer that contains persistent data of a page.
Field Summary | |
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protected byte[] |
data
The data itself. |
static int |
LENGTH_INT
The length of an integer value. |
Constructor Summary | |
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protected |
Data(DataHandler handler,
byte[] data)
|
Method Summary | |
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void |
checkCapacity(int plus)
Check if there is still enough capacity in the buffer. |
static Data |
create(DataHandler handler,
byte[] buff)
Create a new buffer using the given data for the given handler. |
static Data |
create(DataHandler handler,
int capacity)
Create a new buffer for the given handler. |
void |
fillAligned()
Fill up the buffer with empty space and an (initially empty) checksum until the size is a multiple of Constants.FILE_BLOCK_SIZE. |
byte[] |
getBytes()
Get the byte array used for this page. |
static int |
getStringLen(java.lang.String s)
Get the length of a String. |
int |
getValueLen(Value v)
Calculate the number of bytes required to encode the given value. |
static int |
getVarIntLen(int x)
The number of bytes required for a variable size int. |
static int |
getVarLongLen(long x)
The number of bytes required for a variable size long. |
int |
length()
Get the current write position of this buffer, which is the current length. |
void |
read(byte[] buff,
int off,
int len)
Copy a number of bytes to the given buffer from the current position. |
byte |
readByte()
Read one single byte. |
int |
readInt()
Read an integer at the current position. |
long |
readLong()
Read a long value. |
short |
readShortInt()
Read an short integer at the current position. |
java.lang.String |
readString()
Read a String value. |
Value |
readValue()
Read a value. |
int |
readVarInt()
Read a variable size int. |
long |
readVarLong()
Read a variable size long. |
void |
reset()
Set the position to 0. |
void |
setInt(int pos,
int x)
Update an integer at the given position. |
void |
setPos(int pos)
Set the current read / write position. |
void |
truncate(int size)
Shrink the array to this size. |
void |
write(byte[] buff,
int off,
int len)
Append a number of bytes to this buffer. |
void |
writeByte(byte x)
Append one single byte. |
void |
writeInt(int x)
Write an integer at the current position. |
void |
writeLong(long x)
Append a long value. |
void |
writeShortInt(int x)
Write a short integer at the current position. |
void |
writeString(java.lang.String s)
Write a String. |
void |
writeValue(Value v)
Append a value. |
void |
writeVarInt(int x)
Write a variable size int. |
void |
writeVarLong(long x)
Write a variable size long. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final int LENGTH_INT
protected byte[] data
Constructor Detail |
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protected Data(DataHandler handler, byte[] data)
Method Detail |
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public void setInt(int pos, int x)
pos
- the positionx
- the valuepublic void writeInt(int x)
x
- the valuepublic int readInt()
public static int getStringLen(java.lang.String s)
s
- the string
public java.lang.String readString()
public void writeString(java.lang.String s)
s
- the valuepublic static Data create(DataHandler handler, int capacity)
handler
- the data handlercapacity
- the initial capacity of the buffer
public static Data create(DataHandler handler, byte[] buff)
handler
- the data handlerbuff
- the data
public int length()
public byte[] getBytes()
public void reset()
public void write(byte[] buff, int off, int len)
buff
- the dataoff
- the offset in the datalen
- the length in bytespublic void read(byte[] buff, int off, int len)
buff
- the output bufferoff
- the offset in the output bufferlen
- the number of bytes to copypublic void writeByte(byte x)
x
- the valuepublic byte readByte()
public long readLong()
public void writeLong(long x)
x
- the valuepublic void writeValue(Value v)
v
- the valuepublic Value readValue()
public int getValueLen(Value v)
v
- the value
public void setPos(int pos)
pos
- the new positionpublic void writeShortInt(int x)
x
- the valuepublic short readShortInt()
public void truncate(int size)
size
- the new sizepublic static int getVarIntLen(int x)
x
- the value
public void writeVarInt(int x)
x
- the valuepublic int readVarInt()
public static int getVarLongLen(long x)
x
- the value
public void writeVarLong(long x)
x
- the valuepublic long readVarLong()
public void checkCapacity(int plus)
plus
- the number of additional bytes requiredpublic void fillAligned()
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