Package com.arcadedb.query.sql.parser

Class StatementCache

java.lang.Object

com.arcadedb.query.sql.parser.StatementCache

public class StatementCache
extends Object

This class is an LRU cache for already parsed SQL statement executors. It stores itself in the storage as a resource. It also acts an an entry point for the SQL parser.

Author:

Luigi Dell'Aquila (luigi.dellaquila-(at)-gmail.com)

Constructor Summary

Constructors

Constructor	Description
StatementCache(Database db, int size)

Method Summary

Modifier and Type	Method	Description
void	clear()
boolean	contains(String statement)
Statement	get(String statement)
protected Statement	parse(String statement)	parses an SQL statement and returns the corresponding executor
protected static void	throwParsingException(ParseException e, String statement)
protected static void	throwParsingException(TokenMgrError e, String statement)

Methods inherited from class java.lang.Object

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

Constructor Detail

StatementCache

public StatementCache(Database db,
                      int size)

Parameters:

size - the size of the cache

Method Detail

get

public Statement get(String statement)

Parameters:

statement - an SQL statement

Returns:

the corresponding executor, taking it from the internal cache, if it exists

parse

protected Statement parse(String statement)
                   throws CommandSQLParsingException

parses an SQL statement and returns the corresponding executor

Parameters:

statement - the SQL statement

Returns:

the corresponding executor

Throws:

CommandSQLParsingException - if the input parameter is not a valid SQL statement

throwParsingException

protected static void throwParsingException(ParseException e,
                                            String statement)

throwParsingException

protected static void throwParsingException(TokenMgrError e,
                                            String statement)

contains

public boolean contains(String statement)

clear

public void clear()