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).

Inner classes inherited from class edu.mit.ai.psg.jevaES.IEnv

IEnv.ClassResult

Constructor Summary

EnvBase(IEnv nextEnv)

Method Summary

IEnv	getNext() get next env in chain; used by lookup methods
int	getOptionBits() get option bits; for options, see Jeva
IEnv.ClassResult	lookupClass(String queryName) find root class with this name; nested classes found from parent.
IPackage	lookupEnclosingPackage() return enclosing package
IStatementNode	lookupLabel(String queryName, boolean isForContinue) if label found, return node of statement it labels; stops at method or initializer boundary.
IStore	lookupLocal(String queryName) lookup restricted to local variables and parameters, used for checking if a local variable name is already in use.
IPackage	lookupPackage(String rootPackageName) find root package with this name; sub-packages found from parent
Class	lookupReturnType() return type of enclosing method, or void.class if in a constructor, or null if in a static initializer
Class[]	lookupThrows() find checked exceptions declared in throws clause of enclosing method or constructor, or null if not in a method or constructor
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()

Description copied from interface: IEnv

get next env in chain; used by lookup methods

Specified by:

getNext in interface IEnv

toString

public abstract String toString()

Overrides:

toString in class Object

lookupLocal

public IStore lookupLocal(String queryName)

Description copied from interface: IEnv

lookup restricted to local variables and parameters, used for checking if a local variable name is already in use. Local scope may be a method, constructor, field initializer, static initializer, object initializer. [JavaLangSpec1.0sec14.3.2]

Specified by:

lookupLocal in interface IEnv

lookupLabel

public IStatementNode lookupLabel(String queryName,
                                  boolean isForContinue)

Description copied from interface: IEnv

if label found, return node of statement it labels; stops at method or initializer boundary. If label is empty (""), then returns first for, do, while, or switch statement. If isForContinue, then skip unlabeled switch statements.

Specified by:

lookupLabel in interface IEnv

lookupClass

public IEnv.ClassResult lookupClass(String queryName)

Description copied from interface: IEnv

find root class with this name; nested classes found from parent. Returns IEnv.ClassResult if found, else null;

Specified by:

lookupClass in interface IEnv

Tags copied from interface: IEnv

Throws:

IllegalArgumentException - if two on-demand-imports import different classes named queryName.

lookupPackage

public IPackage lookupPackage(String rootPackageName)

Description copied from interface: IEnv

find root package with this name; sub-packages found from parent

Specified by:

lookupPackage in interface IEnv

lookupReturnType

public Class lookupReturnType()

Description copied from interface: IEnv

return type of enclosing method, or void.class if in a constructor, or null if in a static initializer

Specified by:

lookupReturnType in interface IEnv

lookupThrows

public Class[] lookupThrows()

Description copied from interface: IEnv

find checked exceptions declared in throws clause of enclosing method or constructor, or null if not in a method or constructor

Specified by:

lookupThrows in interface IEnv

lookupEnclosingPackage

public IPackage lookupEnclosingPackage()

Description copied from interface: IEnv

return enclosing package

Specified by:

lookupEnclosingPackage in interface IEnv

getOptionBits

public int getOptionBits()

Description copied from interface: IEnv

get option bits; for options, see Jeva

Specified by:

getOptionBits in interface IEnv