edu.mit.ai.psg.jevaES
Class EnvBase

java.lang.Object
  |
  +--edu.mit.ai.psg.jevaES.EnvBase

Direct Known Subclasses:

EnvLocalStore, EnvOptionBits

public abstract class EnvBase

extends Object

implements IEnv

A base class for Environment nodes that forwards all requests to the next environment node. Subclasses should override some methods to actually do some kinds of lookups. (Environments are chains of binding nodes).

Author:

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

Constructor Summary

EnvBase(IEnv nextEnv)

Method Summary

IEnv	getNext()
int	getOptionBits()
Class	lookupClass(String queryName)
IPackage	lookupEnclosingPackage()
IStatementNode	lookupLabel(String queryName, boolean isForContinue)
IStore	lookupLocal(String queryName)
IPackage	lookupPackage(String rootPackageName)
Class	lookupReturnType()
Class[]	lookupThrows()
abstract String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

EnvBase

public EnvBase(IEnv nextEnv)
        throws IllegalArgumentException

Method Detail

getNext

public final IEnv getNext()

Specified by:

getNext in interface IEnv

toString

public abstract String toString()

Overrides:

toString in class Object

lookupLocal

public IStore lookupLocal(String queryName)

Specified by:

lookupLocal in interface IEnv

lookupLabel

public IStatementNode lookupLabel(String queryName,
                                  boolean isForContinue)

Specified by:

lookupLabel in interface IEnv

lookupClass

public Class lookupClass(String queryName)

Specified by:

lookupClass in interface IEnv

lookupPackage

public IPackage lookupPackage(String rootPackageName)

Specified by:

lookupPackage in interface IEnv

lookupReturnType

public Class lookupReturnType()

Specified by:

lookupReturnType in interface IEnv

lookupThrows

public Class[] lookupThrows()

Specified by:

lookupThrows in interface IEnv

lookupEnclosingPackage

public IPackage lookupEnclosingPackage()

Specified by:

lookupEnclosingPackage in interface IEnv

getOptionBits

public int getOptionBits()

Specified by:

getOptionBits in interface IEnv