edu.mit.ai.psg.jeva
Class JNEArrayAccessExpression

java.lang.Object
  |
  +--edu.mit.ai.psg.jeva.SimpleNode
        |
        +--edu.mit.ai.psg.jeva.JevaNode
              |
              +--edu.mit.ai.psg.jeva.ExpressionNode
                    |
                    +--edu.mit.ai.psg.jeva.JNEArrayAccessExpression

public class JNEArrayAccessExpression

extends ExpressionNode

implements IExpressionStoreNode

Jeva parse Node for array[index] Expressions [JavaLangSpec1.0 sec15.12 Array Access Expressions].

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

children, id, parent

Method Summary

boolean	computeIsConstant(IEnv env) Compute whether this expression is a constant (nodes should not call this method directly).
IClass	computeType(IEnv env) computeType also does "compile time" one-time type checks as well.
Object	eval(IEnv env) Evaluate this expression (nodes should not call this method directly).
IStore	evalToStore(IEnv env) Used by assignment.
IExpressionNode	getArrayExpressionNode()
IExpressionNode	getIndexExpressionNode()
Object	jjtAccept(IJevaVisitor visitor, Object data) Accept a visitor.

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

getType, getType, getValue, isConstant

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

checkInsertionPoint, find2ndTokenBeforeEndBody, findChildIndex, findPrecedingToken, findTokenBeforeChild, findTokenBeforeChild, findTokenBeforeEnd, getBeginToken, getEndToken, insertChildTokens, insertNewChildAfter, insertNewChildAt, insertNewChildBefore, jnGetChild, jnGetParent, notVerified, print, print, printSpecialTokens, printToken, printToString, printToString, removeChild, removeChildTokens, replaceChild, replaceChild, setBeginToken, setEndToken, shouldNotHappen, shouldNotHappen, shouldNotHappen, updateEndTokens, updateEndTokensPriorChild, updateEndTokensPriorNode, updateEndTokensPriorNode

Methods inherited from class edu.mit.ai.psg.jeva.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

jjtAccept

public Object jjtAccept(IJevaVisitor visitor,
                        Object data)

Description copied from interface: IJevaNode

Accept a visitor. For visitor design pattern: jjtAccept must simply

  return visitor.visit(this, data);  

which dispatches on the type of this to appropriate method of visitor

Overrides:

jjtAccept in class JevaNode

getArrayExpressionNode

public IExpressionNode getArrayExpressionNode()

getIndexExpressionNode

public IExpressionNode getIndexExpressionNode()

computeType

public IClass computeType(IEnv env)
                   throws VerifyingException

computeType also does "compile time" one-time type checks as well. [JavaLangSpec1.0 sec10.4 Array Access]

Overrides:

computeType in class ExpressionNode

Tags copied from class: ExpressionNode

Parameters:

env - environment of name bindings, etc.

Returns:

the IClass of the static type.

Throws:

VerifyingException - if expression is illegal

See Also:

EvalMethods.getType(IExpressionNode, IEnv)

computeIsConstant

public boolean computeIsConstant(IEnv env)
                          throws VerifyingException

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.jeva.IEnv), EvalMethods.isConstant(IExpressionNode, IEnv)

eval

public Object eval(IEnv env)
            throws ThrowException

Description copied from class: ExpressionNode

Evaluate this expression (nodes should not call this method directly). Called by the getValue method.

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.jeva.IEnv), EvalMethods.eval(IExpressionNode, IEnv)

evalToStore

public IStore evalToStore(IEnv env)
                   throws ThrowException

Used by assignment. ArrayExpr must be evaluated before indexExpr [JavaLangSpec1.0 sec15.12 Array Access Expressions]

Specified by:

evalToStore in interface IExpressionStoreNode

Tags copied from interface: IExpressionStoreNode

Returns:

an IStore which can read and write the location to assign to.

Throws:

ThrowException - if completes abruptly with an exception