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org.apache.excalibur.source.impl.validity
Class NOPValidity

java.lang.Object
  org.apache.excalibur.source.impl.validity.NOPValidity

All Implemented Interfaces:

java.io.Serializable, SourceValidity

public final class NOPValidity

extends java.lang.Object

implements SourceValidity

A validation object which is always valid.

Version:

CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:17 $

Author:

Avalon Development Team

See Also:

Serialized Form

Field Summary

static SourceValidity

SHARED_INSTANCE

Fields inherited from interface org.apache.excalibur.source.SourceValidity

INVALID, UNKNOWN, UNKNWON, VALID

Constructor Summary

NOPValidity()

Method Summary

int	isValid() Check if the component is still valid.
int	isValid(SourceValidity newValidity) Check if the component is still valid.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

SHARED_INSTANCE

public static final SourceValidity SHARED_INSTANCE

Constructor Detail

NOPValidity

public NOPValidity()

Method Detail

isValid

public int isValid()

Check if the component is still valid. If 0 is returned the isValid(SourceValidity) must be called afterwards! If -1 is returned, the component is not valid anymore and if +1 is returnd, the component is valid.

Specified by:

isValid in interface SourceValidity

isValid

public int isValid(SourceValidity newValidity)

Description copied from interface: SourceValidity

Check if the component is still valid. This is only true if the incoming Validity is of the same type and has the "same" values.

The invocation order is that the isValid method of the old Validity object is called with the new one as a parameter.

Specified by:

isValid in interface SourceValidity

Returns:

-1 is returned, if the validity object is not valid anymore +1 is returned, if the validity object is still valid 0 is returned, if the validity check could not be performed. In this case, the new validity object is not usable. Examples for this are: when the validity objects have different types, or when one validity object for any reason is not able to get the required information.

toString

public java.lang.String toString()