org.multijava.mjc
Class CUniverseRuntimeHelper

java.lang.Object
  org.multijava.mjc.CUniverseRuntimeHelper

public class CUniverseRuntimeHelper

extends Object

This is a helper class for the universe runtime checks. Its purpose is to store some information at a central place and therefore make it easier to maintain the transformations that are used to implement the runtime checks.

Author:

scdaniel

Constructor Summary
private	CUniverseRuntimeHelper()

 

Method Summary
static JMethodCallExpression	getCurrentContext()
static JExpression	getCurrentUniverseOwner(CExpressionContextType context)           Get the owner of the current universe.
static JNameExpression	getHashTable()
static JNameExpression	getNameExpression(String ident)           Creates a JNameExpression form a String.
static JExpression	getOwnerTest(CExpressionContextType context, CType dest, JExpression testObject, JExpression expr)           Get the owner test that tests if testObject is compatible (can be casted to) the type described by dest.
static JNameExpression	getPolicy()
static JLocalVariable	getTmpVariable(CExpressionContextType context, JExpression currentNode, CType type)           Get a reference to a temporary variable to store expressions that are used more than once, but should not be evaluated more than once of course.

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

CUniverseRuntimeHelper

private CUniverseRuntimeHelper()

getNameExpression

public static JNameExpression getNameExpression(String ident)

Creates a JNameExpression form a String. Example String: "org.multijava.universes.rt.UniverseRuntime.handler"

Parameters:

ident - the String

Returns:

the corresponding JNameExpression

getCurrentContext

public static JMethodCallExpression getCurrentContext()

Returns:

a JMethodCallExpression, that calls Thread.currentThread()

getHashTable

public static JNameExpression getHashTable()

Returns:

a JNameExpression representing the hashTable class used at runtime.

getPolicy

public static JNameExpression getPolicy()

Returns:

a JNameExpression representing the policy class used at runtime.

getCurrentUniverseOwner

public static JExpression getCurrentUniverseOwner(CExpressionContextType context)

Get the owner of the current universe.

Parameters:

context - the current context

Returns:

the owner of the current universe

getTmpVariable

public static JLocalVariable getTmpVariable(CExpressionContextType context,
                                            JExpression currentNode,
                                            CType type)
                                     throws PositionedError

Get a reference to a temporary variable to store expressions that are used more than once, but should not be evaluated more than once of course. The type of the variable returned is Object[] for array expressions and Object else.

Parameters:

context - the current context

currentNode - the current node ("this" wherever you call it from)

type - the type of the expression

Returns:

a reference to a temporary variable

Throws:

PositionedError

getOwnerTest

public static JExpression getOwnerTest(CExpressionContextType context,
                                       CType dest,
                                       JExpression testObject,
                                       JExpression expr)

Get the owner test that tests if testObject is compatible (can be casted to) the type described by dest. The return value can be null. Then the test is not necessary (testing for readonly for example).

Parameters:

context - the current context

dest - the destination type (what to test for)

testObject - the location where the expression is found (ie maybe a temporary variable)

expr - the expression itself

Returns:

the test for this conversion