edu.umd.cs.findbugs.ba.type

Class NullType

java.lang.Object

org.apache.bcel.generic.Type

org.apache.bcel.generic.ReferenceType

edu.umd.cs.findbugs.ba.type.NullType

All Implemented Interfaces:

ExtendedTypes, java.io.Serializable

public class NullType
extends org.apache.bcel.generic.ReferenceType
implements ExtendedTypes

Special type representing the null value. This is a type which is higher in the lattice than any object type, but lower than the overall Top type. It represents the type of the null value, which may logically be merged with any object type without loss of information.

Author:

David Hovemeyer

See Also:

TypeAnalysis, TypeFrame, TypeMerger, Serialized Form

Field Summary

Fields inherited from class org.apache.bcel.generic.Type

BOOLEAN, BYTE, CHAR, CLASS, DOUBLE, FLOAT, INT, LONG, NO_ARGS, NULL, OBJECT, SHORT, signature, STRING, STRINGBUFFER, THROWABLE, type, UNKNOWN, VOID

Fields inherited from interface edu.umd.cs.findbugs.ba.type.ExtendedTypes

T_AVAIL_TYPE, T_BOTTOM, T_DOUBLE_EXTRA, T_EXCEPTION, T_LONG_EXTRA, T_NULL, T_TOP

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
int	hashCode()
static NullType	instance()

Methods inherited from class org.apache.bcel.generic.ReferenceType

firstCommonSuperclass, getFirstCommonSuperclass, isAssignmentCompatibleWith, isCastableTo

Methods inherited from class org.apache.bcel.generic.Type

getArgumentTypes, getMethodSignature, getReturnType, getSignature, getSignature, getSize, getType, getType, getType, getTypes, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

hashCode

public int hashCode()

Overrides:

hashCode in class org.apache.bcel.generic.Type

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class org.apache.bcel.generic.Type

instance

public static NullType instance()