com.alibaba.qlexpress4.runtime

Class QvmGlobalScope

java.lang.Object

com.alibaba.qlexpress4.runtime.QvmGlobalScope

All Implemented Interfaces:

QScope

public class QvmGlobalScope
extends java.lang.Object
implements QScope

global scope Author: DQinYuan

Constructor Summary

Constructors

Constructor and Description
QvmGlobalScope(ExpressContext externalVariable, java.util.Map<java.lang.String,CustomFunction> externalFunction, QLOptions qlOptions)

Method Summary

Modifier and Type	Method and Description
void	defineFunction(java.lang.String functionName, CustomFunction function) define local function in scope
void	defineLocalSymbol(java.lang.String varName, java.lang.Class<?> varClz, java.lang.Object value) define a symbol in local scope
CustomFunction	getFunction(java.lang.String functionName) get function or lambda define
java.util.Map<java.lang.String,CustomFunction>	getFunctionTable() get function table in this scope
QScope	getParent()
Value	getSymbol(java.lang.String varName) get assignable symbol variable by name
java.lang.Object	getSymbolValue(java.lang.String varName) get symbol variable value by name
QScope	newScope()
Value	peek()
Value	pop() pop one element on top of stack
Parameters	pop(int number) pop number elements on top of stack
void	push(Value value) push value on the top of stack

Methods inherited from class java.lang.Object

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

Constructor Detail

QvmGlobalScope

public QvmGlobalScope(ExpressContext externalVariable,
                      java.util.Map<java.lang.String,CustomFunction> externalFunction,
                      QLOptions qlOptions)

Method Detail

getSymbol

public Value getSymbol(java.lang.String varName)

Description copied from interface: QScope

get assignable symbol variable by name

Specified by:

getSymbol in interface QScope

Parameters:

varName - variable name

Returns:

value, null if not exist

getSymbolValue

public java.lang.Object getSymbolValue(java.lang.String varName)

Description copied from interface: QScope

get symbol variable value by name

Specified by:

getSymbolValue in interface QScope

Parameters:

varName - variable name

Returns:

inner value, null if not exist

defineLocalSymbol

public void defineLocalSymbol(java.lang.String varName,
                              java.lang.Class<?> varClz,
                              java.lang.Object value)

Description copied from interface: QScope

define a symbol in local scope

Specified by:

defineLocalSymbol in interface QScope

Parameters:

varName - variable name

varClz - class of variable

value - init value

defineFunction

public void defineFunction(java.lang.String functionName,
                           CustomFunction function)

Description copied from interface: QScope

define local function in scope

Specified by:

defineFunction in interface QScope

Parameters:

functionName - name of function

function - implement of function

getFunction

public CustomFunction getFunction(java.lang.String functionName)

Description copied from interface: QScope

get function or lambda define

Specified by:

getFunction in interface QScope

Parameters:

functionName - name of function

Returns:

null if not exist

getFunctionTable

public java.util.Map<java.lang.String,CustomFunction> getFunctionTable()

Description copied from interface: QScope

get function table in this scope

Specified by:

getFunctionTable in interface QScope

Returns:

function table

push

public void push(Value value)

Description copied from interface: QScope

push value on the top of stack

Specified by:

push in interface QScope

Parameters:

value - pushed element

pop

public Parameters pop(int number)

Description copied from interface: QScope

pop number elements on top of stack

Specified by:

pop in interface QScope

Parameters:

number - pop elements' number

Returns:

popped elements

pop

public Value pop()

Description copied from interface: QScope

pop one element on top of stack

Specified by:

pop in interface QScope

Returns:

popped element

peek

public Value peek()

Specified by:

peek in interface QScope

Returns:

top element of stack without pop

getParent

public QScope getParent()

Specified by:

getParent in interface QScope

Returns:

parent scope

newScope

public QScope newScope()

Specified by:

newScope in interface QScope

Returns:

new scope base origin stack