edu.mit.ai.psg.jevaES
Class JNEAssignmentExpression

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

public class JNEAssignmentExpression

extends ExpressionNode

implements JevaESParserConstants

Jeva parse Nodes for all assignment Expressions (=, +=, *=, etc.) [JavaLangSpec1.0 sec 15.25]. Note that assignment conversion is less powerful than casting conversion, so "int x; x = 1.0;" is not ok, but "int x; x += 1.0;" is ok.

Author:

CarlManning, caroma@ai.mit.edu
Copyright (c) 1997, 1998 Massachusetts Institute of Technology

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

children, id, parent

Method Summary

boolean	computeIsConstant(IEnv env)
Class	computeType(IEnv env) Type is the type of the assignment target
Object	eval(IEnv env) Eval must evaluate left side target before right side expression [JavaLangSpec1.0 sec 15.25] So left side returns a thunk to do the store.
JNEAssignmentOperator	getAssignmentOperatorNode()
IExpressionNode	getSourceExpressionNode()
IExpressionStoreNode	getTargetStoreNode()

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, print, print, printToken, printToString, printToString, setBeginToken, setEndToken

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

getTargetStoreNode

public IExpressionStoreNode getTargetStoreNode()

getAssignmentOperatorNode

public JNEAssignmentOperator getAssignmentOperatorNode()

getSourceExpressionNode

public IExpressionNode getSourceExpressionNode()

computeType

public Class computeType(IEnv env)
                  throws VerifyingException

Type is the type of the assignment target

Overrides:

computeType in class ExpressionNode

computeIsConstant

public boolean computeIsConstant(IEnv env)

Overrides:

computeIsConstant in class ExpressionNode

eval

public Object eval(IEnv env)
            throws ThrowException

Eval must evaluate left side target before right side expression [JavaLangSpec1.0 sec 15.25] So left side returns a thunk to do the store.

Overrides:

eval in class ExpressionNode