prefuse.util
Class TypeLib

java.lang.Object
  prefuse.util.TypeLib

public class TypeLib
extends java.lang.Object

Library routines dealing with Java Class types.

Author:

jeffrey heer

Method Summary

static java.lang.Class	getNumericType(java.lang.Class c1, java.lang.Class c2) Get a compatible numeric type for two primitive numeric class types.
static java.lang.Class	getPrimitiveType(java.lang.Class type) Given a numeric (byte, short, int, long, float, or double) class type or associated wrapper class type, return the primitive class type
static java.lang.Class	getSharedType(java.lang.Class type1, java.lang.Class type2) Get the nearest shared ancestor class of two classes.
static java.lang.Class	getSharedType(java.lang.Object o1, java.lang.Object o2) Get the nearest shared ancestor class of two objects.
static java.lang.Class	getWrapperType(java.lang.Class type) Get the wrapper class type for a primitive class type.
static boolean	isIntegerType(java.lang.Class type) Indicates if a given class type is a primitive integer type (one of byte, short, int, or long).
static boolean	isNumericType(java.lang.Class type) Indicates if a given class type is a primitive numeric one type (one of byte, short, int, long, float, or double).
static boolean	isWrapperInstance(java.lang.Class type, java.lang.Object instance) Indicates if an object is an instance of a wrapper class for a given primitive type.
static boolean	typeCheck(java.lang.Class type, java.lang.Object instance) Check if an object is an instance of a given class, or, if the class is a primitive type, if the Object is an instance of the wrapper class for that primitive (e.g., as Integer is a wrapper for int).

Methods inherited from class java.lang.Object

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

Method Detail

typeCheck

public static boolean typeCheck(java.lang.Class type,
                                java.lang.Object instance)

Check if an object is an instance of a given class, or, if the class is a primitive type, if the Object is an instance of the wrapper class for that primitive (e.g., as Integer is a wrapper for int).

Parameters:

type - the Class type

instance - the Object instance

Returns:

true if the object is an instance of the given class, or if of the appropriate primitive wrapper type.

getSharedType

public static java.lang.Class getSharedType(java.lang.Object o1,
                                            java.lang.Object o2)

Get the nearest shared ancestor class of two objects. Note: this currently does not compute the actual least common ancestor, but only looks up one level in the inheritance tree and quits if it does not find a match.

Parameters:

o1 - the first object

o2 - the second object

Returns:

the nearest class instance of which both objects are instances

getSharedType

public static java.lang.Class getSharedType(java.lang.Class type1,
                                            java.lang.Class type2)

Get the nearest shared ancestor class of two classes. Note: this currently does not compute the actual least common ancestor, but only looks up one level in the inheritance tree and quits if it does not find a match.

Parameters:

type1 - the first type

type2 - the second type

Returns:

the nearest class instance which is equal to or a superclass of the two class instances

isWrapperInstance

public static boolean isWrapperInstance(java.lang.Class type,
                                        java.lang.Object instance)

Indicates if an object is an instance of a wrapper class for a given primitive type.

Parameters:

type - the primitive Class type

instance - the object to test as wrapper (e.g., as Integer is a wrapper type for int)

Returns:

true if the object is a wrapper instance of the given primitive type

getPrimitiveType

public static java.lang.Class getPrimitiveType(java.lang.Class type)

Given a numeric (byte, short, int, long, float, or double) class type or associated wrapper class type, return the primitive class type

Parameters:

type - the type to look up, must be a numerical type, but can be either primitive or a wrapper.

Returns:

the primitive class type

getWrapperType

public static java.lang.Class getWrapperType(java.lang.Class type)

Get the wrapper class type for a primitive class type.

Parameters:

type - a class type

Returns:

the wrapper class for the input type if it is a primitive class type, otherwise returns the input type

isIntegerType

public static boolean isIntegerType(java.lang.Class type)

Indicates if a given class type is a primitive integer type (one of byte, short, int, or long).

Parameters:

type - the type to check

Returns:

true if it is a primitive numeric type, false otherwise

isNumericType

public static boolean isNumericType(java.lang.Class type)

Indicates if a given class type is a primitive numeric one type (one of byte, short, int, long, float, or double).

Parameters:

type - the type to check

Returns:

true if it is a primitive numeric type, false otherwise

getNumericType

public static java.lang.Class getNumericType(java.lang.Class c1,
                                             java.lang.Class c2)

Get a compatible numeric type for two primitive numeric class types. Any of (byte, short, int) will resolve to int.

Parameters:

c1 - a numeric primitive class type (int, long, float, or double)

c2 - a numeric primitive class type (int, long, float, or double)

Returns:

the compatible numeric type for binary operations involving both types.