org.apache.jdo.impl.model.java
Class NullType

java.lang.Object
  org.apache.jdo.impl.model.java.AbstractJavaType
      org.apache.jdo.impl.model.java.NullType

All Implemented Interfaces:

JavaElement, JavaType

public class NullType

extends AbstractJavaType

An instance of class NullType represents the type of the null expression in Java. It is compatible to all reference types.

Since:

JDO 1.0.1

Author:

Michael Bouschen

Field Summary

static NullType

nullType The singleton NullType instance.

Constructor Summary

protected

NullType() Creates new a NullType instance.

Method Summary

java.lang.String	getName() Returns the name of the type.
boolean	isCompatibleWith(JavaType javaType) Returns true if this JavaType is compatible with the specified JavaType.

Methods inherited from class org.apache.jdo.impl.model.java.AbstractJavaType

equals, getArrayComponentType, getDeclaredJavaFields, getDeclaredJavaProperties, getJavaField, getJavaProperty, getJDOClass, getModifiers, getSuperclass, getUnderlyingObject, hashCode, isArray, isFloatingPoint, isIntegral, isInterface, isJDOSupportedCollection, isJDOSupportedMap, isOrderable, isPersistenceCapable, isPrimitive, isTrackable, isValue, isWrapperClass, toString

Methods inherited from class java.lang.Object

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

Field Detail

nullType

public static final NullType nullType

The singleton NullType instance.

Constructor Detail

NullType

protected NullType()

Creates new a NullType instance. This constructor should not be called directly; instead, the singleton instance nullType should be used.

Method Detail

isCompatibleWith

public boolean isCompatibleWith(JavaType javaType)

Returns true if this JavaType is compatible with the specified JavaType. This implementation returns true, if the specified javaType is a not a primitive type, because the type of null is compatiple with all reference types.

Specified by:

isCompatibleWith in interface JavaType

Overrides:

isCompatibleWith in class AbstractJavaType

Parameters:

javaType - the type this JavaType is checked with.

Returns:

true if this is compatible with the specified type; false otherwise.

getName

public java.lang.String getName()

Returns the name of the type.

Specified by:

getName in interface JavaType

Specified by:

getName in class AbstractJavaType

Returns:

type name