com.alibaba.druid.sql.parser
Class SymbolTable

java.lang.Object
  com.alibaba.druid.sql.parser.SymbolTable

public class SymbolTable
extends Object

Author:

wenshao

Field Summary

static int	DEFAULT_TABLE_SIZE Default table size.
static int	MAX_SIZE

Constructor Summary

SymbolTable()
Constructs a symbol table with a default number of buckets.

SymbolTable(int tableSize)
Constructs a symbol table with a specified number of buckets.

Method Summary

String	addSymbol(char[] buffer, int offset, int len)
String	addSymbol(char[] buffer, int offset, int len, int hash) Adds the specified symbol to the symbol table and returns a reference to the unique symbol.
String	addSymbol(String symbol) Adds the specified symbol to the symbol table and returns a reference to the unique symbol.
int	getIndexMask()
static int	hash(char[] buffer, int offset, int len)
static int	hash(String symbol)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_TABLE_SIZE

public static final int DEFAULT_TABLE_SIZE

Default table size.

See Also:

Constant Field Values

MAX_SIZE

public static final int MAX_SIZE

See Also:

Constant Field Values

Constructor Detail

SymbolTable

public SymbolTable()

Constructs a symbol table with a default number of buckets.

SymbolTable

public SymbolTable(int tableSize)

Constructs a symbol table with a specified number of buckets.

Method Detail

addSymbol

public String addSymbol(String symbol)

Adds the specified symbol to the symbol table and returns a reference to the unique symbol. If the symbol already exists, the previous symbol reference is returned instead, in order guarantee that symbol references remain unique.

Parameters:

symbol - The new symbol.

getIndexMask

public int getIndexMask()

addSymbol

public String addSymbol(char[] buffer,
                        int offset,
                        int len)

addSymbol

public String addSymbol(char[] buffer,
                        int offset,
                        int len,
                        int hash)

Adds the specified symbol to the symbol table and returns a reference to the unique symbol. If the symbol already exists, the previous symbol reference is returned instead, in order guarantee that symbol references remain unique.

Parameters:

buffer - The buffer containing the new symbol.

offset - The offset into the buffer of the new symbol.

len - The length of the new symbol in the buffer.

hash

public static final int hash(String symbol)

hash

public static final int hash(char[] buffer,
                             int offset,
                             int len)