org.bridje.el

Interface ElEnvironment

public interface ElEnvironment

Represents an environment that holds the variables that can be evaluated and assigned in the expression language execution context.

Method Summary

Modifier and Type	Method and Description
<T> T	get(String expression, Class<T> resultCls) Evaluates the given expression and cast the result of it to the given result class.
<T> T	getVar(String name, Class<T> resultCls) Gets the value of the specified variable.
String	getVarAsString(String name) Gets the var as the string.
void	popVar(String name) Pops the value out of the stack of the given variable.
<T> void	pushVar(String name, T value) Push the value into the stack of the specified variable.
<T> void	set(String expression, T value) Sets the given expression to the specified value.
boolean	varExists(String name) Determines if the given var exists in the enviroment.

Method Detail

get

<T> T get(String expression,
          Class<T> resultCls)

Evaluates the given expression and cast the result of it to the given result class.

Type Parameters:

T - The type of the result of the expression.

Parameters:

expression - The expression.

resultCls - The result class for the expression.

Returns:

An object of the given resultClss.

set

<T> void set(String expression,
             T value)

Sets the given expression to the specified value.

Type Parameters:

T - The type of the value.

Parameters:

expression - The expression to assign.

value - The value to assign.

getVar

<T> T getVar(String name,
             Class<T> resultCls)

Gets the value of the specified variable.

Type Parameters:

T - The type of the variable.

Parameters:

name - The name of the variable.

resultCls - The result class for the variable.

Returns:

The value of the variable.

pushVar

<T> void pushVar(String name,
                 T value)

Push the value into the stack of the specified variable.

Type Parameters:

T - The type of the variable.

Parameters:

name - The name of the variable.

value - The value of the variable.

popVar

void popVar(String name)

Pops the value out of the stack of the given variable.

Parameters:

name - The name of the variable.

getVarAsString

String getVarAsString(String name)

Gets the var as the string.

Parameters:

name - The name of the var.

Returns:

The string value for this var.

varExists

boolean varExists(String name)

Determines if the given var exists in the enviroment.

Parameters:

name - The name of the var to test.

Returns:

true if the var exists in the enviroment, false otherwise.