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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Intersect Software Corporation
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.control;
import net.wotonomy.foundation.NSKeyValueCoding;
/**
* EOKeyValueCoding defines an interface for classes that need to have more
* control over the wotonomy's property introspection facilities. <br>
* <br>
*
* On an object that implements this interface, wotonomy will call these
* methods, and otherwise use the static methods on EOKeyValueCodingSupport.
* <br>
* <br>
*
* EOKeyValueCodingSupport implements the default behaviors for each of these
* methods, so classes implementing this interface can call those methods to
* acheive the same behavior. <br>
* <br>
*
* valueForKey and takeValueForKey are called in response to user actions, like
* viewing an object or updating its value in a user interface. These should
* call the public getter and setter methods on the object itself and the
* operations should be subject to validation. <br>
* <br>
*
* storedValueForKey and takeStoredValueForKey are called in response to
* wotonomy actions, like snapshotting, faulting, commits, and reverts. These
* operations should bypass the public methods and directly modify the internal
* state of the object without validation.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 893 $
*/
public interface EOKeyValueCoding extends NSKeyValueCoding {
/**
* Returns the value for the specified property. If the property does not exist,
* this method should call handleQueryWithUnboundKey.
*/
Object valueForKey(String aKey);
/**
* Sets the property to the specified value. If the property does not exist,
* this method should call handleTakeValueForUnboundKey. If the property is of a
* type that cannot allow null (e.g. primitive types) and aValue is null, this
* method should call unableToSetNullForKey.
*/
void takeValueForKey(Object aValue, String aKey);
/**
* Returns the value for the private field that corresponds to the specified
* property.
*/
Object storedValueForKey(String aKey);
/**
* Sets the the private field that corresponds to the specified property to the
* specified value.
*/
void takeStoredValueForKey(Object aValue, String aKey);
/**
* Called by valueForKey when the specified key is not found on this object.
* Implementing classes should handle the specified value or otherwise throw an
* exception.
*/
Object handleQueryWithUnboundKey(String aKey);
/**
* Called by takeValueForKey when the specified key is not found on this object.
* Implementing classes should handle the specified value or otherwise throw an
* exception.
*/
void handleTakeValueForUnboundKey(Object aValue, String aKey);
/**
* Called by takeValueForKey when the type of the specified key is not allowed
* to be null, as is the case with primitive types. Implementing classes should
* handle this case appropriately or otherwise throw an exception.
*/
void unableToSetNullForKey(String aKey);
}
/*
* $Log$ Revision 1.1 2006/02/16 13:19:57 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.3 2003/01/16 22:47:30 mpowers Compatibility changes to support
* compiling woextensions source. (34 out of 56 classes compile!)
*
* Revision 1.2 2001/03/28 16:12:30 mpowers Documented interface.
*
* Revision 1.1 2001/03/27 23:25:05 mpowers Contributing interface, no docs yet.
*
*
*/
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