edu.mit.ai.psg.jevaES
Class JNELiteralExpression

java.lang.Object
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  +--edu.mit.ai.psg.jevaES.SimpleNode
        |
        +--edu.mit.ai.psg.jevaES.JevaNode
              |
              +--edu.mit.ai.psg.jevaES.ExpressionNode
                    |
                    +--edu.mit.ai.psg.jevaES.JNELiteralExpression

public class JNELiteralExpression

extends ExpressionNode

Jeva parse node for literal expressions (1, 3.14, "Hi", etc.)

Fields inherited from class edu.mit.ai.psg.jevaES.SimpleNode

children, id, parent

Method Summary

boolean	computeIsConstant(IEnv env) Compute whether this expression is a constant (nodes should not call this method directly).
Class	computeType(IEnv env) Compute the static type of the expression (nodes should not call this method directly).
Object	eval(IEnv env) This should never be called.
void	setValue(Object val, Class literalType)

Methods inherited from class edu.mit.ai.psg.jevaES.ExpressionNode

getType, getValue, isConstant

Methods inherited from class edu.mit.ai.psg.jevaES.JevaNode

getBeginToken, getEndToken, notVerified, print, print, printToken, printToString, printToString, setBeginToken, setEndToken, shouldNotHappen, shouldNotHappen, shouldNotHappen

Methods inherited from class edu.mit.ai.psg.jevaES.SimpleNode

dump, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, toString, toString

Methods inherited from class java.lang.Object

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

Method Detail

setValue

public void setValue(Object val,
                     Class literalType)

computeIsConstant

public boolean computeIsConstant(IEnv env)

Description copied from class: ExpressionNode

Compute whether this expression is a constant (nodes should not call this method directly). Called by the isConstant method.

Overrides:

computeIsConstant in class ExpressionNode

Tags copied from class: ExpressionNode

Parameters:

env - environment of name bindings, etc.

Throws:

VerifyingException - if expression is illegal.

See Also:

ExpressionNode.isConstant(edu.mit.ai.psg.jevaES.IEnv), EvalMethods.isConstant(IExpressionNode, IEnv)

computeType

public Class computeType(IEnv env)

Description copied from class: ExpressionNode

Compute the static type of the expression (nodes should not call this method directly). Called by getType.

Overrides:

computeType in class ExpressionNode

Tags copied from class: ExpressionNode

Parameters:

env - environment of name bindings, etc.

Throws:

VerifyingException - if expression is illegal

See Also:

EvalMethods.getType(IExpressionNode, IEnv)

eval

public Object eval(IEnv env)

This should never be called. EvalMethods.eval calls getValue, which calls eval only if it isn't a constant already computed. Literals are computed at parse time, so they are always computed.

Overrides:

eval in class ExpressionNode

Tags copied from class: ExpressionNode

Parameters:

env - environment of name bindings, etc.

Throws:

ThrowException - if abruptly completed with an exception

See Also:

ExpressionNode.getValue(edu.mit.ai.psg.jevaES.IEnv), EvalMethods.eval(IExpressionNode, IEnv)