com.plotnix.jex.adapters
Class InterpretedExpression

java.lang.Object
  |
  +--com.plotnix.jex.adapters.InterpretedExpression

All Implemented Interfaces:

Expression, IterationExpression, VariableExpression

public class InterpretedExpression

extends java.lang.Object

implements Expression, IterationExpression, VariableExpression

A wrapper for an expression string associated with an interpreter. When asked to evaluate itself, an InterpreterExpression passes the expression string to the interpreter for evaluation.

Version:

$Revision$

Author:

Dmitri Plotnikov

Constructor Summary

InterpretedExpression(Interpreter interpreter, java.lang.String expression)

Method Summary

void	assign(Context context, java.lang.Object value, java.lang.Object[] arguments) Modifies a value in the specified context according to the expression and the supplied arguments.
java.lang.Object	evaluate(Context context, java.lang.Object[] arguments) Produces the value described by the expression in the specified context with the supplied arguments.
java.lang.Object	evaluate(Context context, java.lang.Object[] arguments, java.lang.Class valueType) Evaluates the expression and casts the result to the supplied type.
java.util.Iterator	iterate(Context context, java.lang.Object[] arguments) Produces the iterator described by the expression in the specified context with the supplied arguments.

Methods inherited from class java.lang.Object

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

Constructor Detail

InterpretedExpression

public InterpretedExpression(Interpreter interpreter,
                             java.lang.String expression)

Parameters:

interpreter - is the interpreter for the expression language

expression - is the expression to be interpreted

Method Detail

evaluate

public java.lang.Object evaluate(Context context,
                                 java.lang.Object[] arguments)

Description copied from interface: Expression

Produces the value described by the expression in the specified context with the supplied arguments.

Specified by:

evaluate in interface Expression

See Also:

Expression.evaluate(Context, Object[])

evaluate

public java.lang.Object evaluate(Context context,
                                 java.lang.Object[] arguments,
                                 java.lang.Class valueType)

Description copied from interface: Expression

Evaluates the expression and casts the result to the supplied type.

Specified by:

evaluate in interface Expression

See Also:

Expression.evaluate(Context, Object[], Class)

iterate

public java.util.Iterator iterate(Context context,
                                  java.lang.Object[] arguments)

Description copied from interface: IterationExpression

Produces the iterator described by the expression in the specified context with the supplied arguments.

Specified by:

iterate in interface IterationExpression

See Also:

IterationExpression.iterate(Context, Object[])

assign

public void assign(Context context,
                   java.lang.Object value,
                   java.lang.Object[] arguments)

Description copied from interface: VariableExpression

Modifies a value in the specified context according to the expression and the supplied arguments. Casts the type of the value if necessary.

Specified by:

assign in interface VariableExpression

See Also:

VariableExpression.assign(Context, Object, Object[])