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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.foundation;
import net.wotonomy.foundation.internal.Introspector;
import net.wotonomy.foundation.internal.IntrospectorException;
import net.wotonomy.foundation.internal.MissingPropertyException;
import net.wotonomy.foundation.internal.NullPrimitiveException;
import net.wotonomy.foundation.internal.WotonomyException;
/**
* NSKeyValueCodingSupport defines default behavior for classes implementing
* NSKeyValueSupport. <br>
* <br>
*
* On an object that does not implement NSKeyValueCoding, wotonomy will call the
* methods on this class directly.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 892 $
*/
public class NSKeyValueCodingSupport {
/**
* Returns the value for the specified property key on the specified object.
* <br>
* <br>
*
* If the property does not exist, this method calls handleQueryWithUnboundKey
* on the object if it implements NSKeyValueCoding, otherwise calls
* handleQueryWithUnboundKey on this class. <br>
* <br>
*/
static public Object valueForKey(Object anObject, String aKey) {
// TODO: may need to handle "." nesting here so
// that handleQueryWithUnboundKey gets called for
// for the nested object, not the parent object
// Correction: need to handle key paths in
// KeyValueCodingAdditionsSupport.
try {
return Introspector.get(anObject, aKey);
} catch (IntrospectorException exc) {
if (anObject instanceof NSKeyValueCoding) {
return ((NSKeyValueCoding) anObject).handleQueryWithUnboundKey(aKey);
}
return handleQueryWithUnboundKey(anObject, aKey);
}
}
/**
* Sets the property to the specified value on the specified object.
*
* If the property does not exist, this method calls
* handleTakeValueForUnboundKey on the object if it implements NSKeyValueCoding,
* otherwise calls handleTakeValueForUnboundKey on this class.
*
* If the property is of a type that cannot allow null (e.g. primitive types)
* and aValue is null, this method should call unableToSetNullForKey on the
* object if it implements NSKeyValueCoding, otherwise calls
* unableToSetNullForKey on this class.
*/
static public void takeValueForKey(Object anObject, Object aValue, String aKey) {
// TODO: may need to handle "." nesting here so
// that handleTakeValueForUnboundKey gets called for
// for the nested object, not the parent object
try {
Introspector.set(anObject, aKey, aValue);
} catch (NullPrimitiveException exc) {
if (anObject instanceof NSKeyValueCoding) {
((NSKeyValueCoding) anObject).unableToSetNullForKey(aKey);
} else {
unableToSetNullForKey(anObject, aKey);
}
} catch (MissingPropertyException exc) {
if (anObject instanceof NSKeyValueCoding) {
((NSKeyValueCoding) anObject).handleTakeValueForUnboundKey(aValue, aKey);
} else {
handleTakeValueForUnboundKey(anObject, aValue, aKey);
}
}
}
/**
* Returns the value for the private field that corresponds to the specified
* property on the specified object.
*
* This implementation currently calls valueForKey, because java security
* currently prevents us from accessing the fields of another object.
*/
static public Object storedValueForKey(Object anObject, String aKey) {
// TODO: this currently just calls valueForKey
return valueForKey(anObject, aKey);
}
/**
* Sets the the private field that corresponds to the specified property to the
* specified value on the specified object.
*
* This implementation currently calls takeValueForKey, because java security
* currently prevents us from accessing the fields of another object.
*/
static public void takeStoredValueForKey(Object anObject, Object aValue, String aKey) {
// TODO: this currently just calls takeValueForKey
takeValueForKey(anObject, aValue, aKey);
}
/**
* Called by valueForKey when the specified key is not found on the specified
* object, if that object does not implement NSKeyValueCoding.
*
* This implementation throws a WotonomyException.
*/
static public Object handleQueryWithUnboundKey(Object anObject, String aKey) {
throw new WotonomyException("Key not found for object: " + aKey + " : " + anObject);
}
/**
* Called by takeValueForKey when the specified key is not found on the
* specified object, if that object does not implement NSKeyValueCoding.
*
* This implementation throws a WotonomyException.
*/
static public void handleTakeValueForUnboundKey(Object anObject, Object aValue, String aKey) {
throw new WotonomyException(
"Key not found for object while setting value: " + aKey + " : " + anObject + " : " + aValue);
}
/**
* Called by takeValueForKey when the type of the specified key is not allowed
* to be null, as is the case with primitive types, if the specified object does
* not implement NSKeyValueCoding.
*
* This implementation throws a WotonomyException.
*/
static public void unableToSetNullForKey(Object anObject, String aKey) {
throw new WotonomyException("Tried to key on object to null: " + aKey + " : " + anObject);
}
}
/*
* $Log$ Revision 1.1 2006/02/16 12:47:16 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.1 2003/01/17 14:40:50 mpowers Adding files to fix build.
*
* Revision 1.4 2001/05/18 21:04:33 mpowers Reimplemented
* EditingContext.initializeObject.
*
* Revision 1.3 2001/04/27 00:28:29 mpowers Fixed a return value.
*
* Revision 1.2 2001/04/03 20:36:01 mpowers Fixed
* refaulting/reverting/invalidating to be self-consistent.
*
* Revision 1.1 2001/03/28 17:49:33 mpowers Implemented NSKeyValueCodingSupport.
*
*
*/
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