Package com.ibm.wala.shrike.shrikeBT.analysis

Class ClassHierarchy

java.lang.Object

com.ibm.wala.shrike.shrikeBT.analysis.ClassHierarchy

public final class ClassHierarchy
extends Object

This class takes the raw information from a ClassHierarchyProvider and computes type operations (subtype check, type union). All operations are static.

Because ClassHierarchyProvider sometimes only provides partial information, these routines sometimes answer "don't know".

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAYBE	Equals Constants.MAYBE
static final int	NO	Equals Constants.NO
static final int	YES	Equals Constants.YES

Method Summary

Modifier and Type	Method	Description
static String	findCommonSupertype(ClassHierarchyProvider hierarchy, String t1, String t2)	Compute the most specific common supertype.
static int	isSubtypeOf(ClassHierarchyProvider hierarchy, String t1, String t2)	Perform subtype check.

Methods inherited from class java.lang.Object

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

Field Details

NO

public static final int NO

Equals Constants.NO

See Also:

• Constant Field Values

YES

public static final int YES

Equals Constants.YES

See Also:

• Constant Field Values

MAYBE

public static final int MAYBE

Equals Constants.MAYBE

See Also:

• Constant Field Values

Method Details

isSubtypeOf

public static int isSubtypeOf(ClassHierarchyProvider hierarchy,
 String t1,
 String t2)

Perform subtype check.

Parameters:

hierarchy - the hierarchy information to use for the decision

t1 - a type in JVM format

t2 - a type in JVM format

Returns:

whether t1 is a subtype of t2 (YES, NO, MAYBE)

findCommonSupertype

public static String findCommonSupertype(ClassHierarchyProvider hierarchy,
 String t1,
 String t2)

Compute the most specific common supertype.

Parameters:

hierarchy - the hierarchy information to use for the decision

t1 - a type in JVM format

t2 - a type in JVM format

Returns:

the most specific common supertype of t1 and t2, or TYPE_unknown if it cannot be determined or cannot be represented as a Java type, or null if there is no common supertype