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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.NSMutableDictionary;
import net.wotonomy.foundation.NSNull;
/**
* EOGenericRecord extends EOCustomObject to provide a general-purpose
* implementation, relying entirely on the class description for entity-specific
* behavior, and storing data in a dictionary.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 894 $
*/
public class EOGenericRecord extends EOCustomObject {
private EOClassDescription classDescription;
private NSMutableDictionary dataDictionary;
/**
* Default constructor.
*/
protected EOGenericRecord() {
classDescription = null;
dataDictionary = new NSMutableDictionary();
}
/**
* Preferred constructor.
*/
public EOGenericRecord(EOClassDescription aDescription) {
this();
classDescription = aDescription;
}
/**
* Overridden to return true so that deferred faults are used.
*/
public static boolean usesDeferredFaultCreation() {
return true;
}
/**
* Compatibility constructor: aContext and anID are ignored.
*/
public EOGenericRecord(EOEditingContext aContext, EOClassDescription aDescription, EOGlobalID anID) {
this(aDescription);
}
/**
* Returns a class description for this object. Overridden to return the class
* description passed into the constructor.
*/
public EOClassDescription classDescription() {
return classDescription;
}
// interface EOKeyValueCoding
/**
* Calls storedValueForKey.
*/
public Object valueForKey(String aKey) {
return storedValueForKey(aKey);
}
/**
* Calls willChange and then calls takeStoredValueForKey.
*/
public void takeValueForKey(Object aValue, String aKey) {
willChange();
takeStoredValueForKey(aValue, aKey);
}
/**
* Calls willRead for the specified key, and returns the corresponding value
* from the data dictionary. Keys that do not exist will return null.
*/
public Object storedValueForKey(String aKey) {
willRead(aKey);
Object result = dataDictionary.objectForKey(aKey);
if (NSNull.nullValue().equals(result))
result = null;
return result;
}
/**
* Writes the specified value into the data dictionary for the specified key.
* Nulls are stored as NSNulls in the dictionary. No checking is performed to
* determine whether the key is a valid attribute key.
*/
public void takeStoredValueForKey(Object aValue, String aKey) {
if (aValue == null)
aValue = NSNull.nullValue();
dataDictionary.setObjectForKey(aValue, aKey);
}
}
/*
* $Log$ Revision 1.2 2006/02/16 16:47:14 cgruber Move some classes in to
* "internal" packages and re-work imports, etc.
*
* Also use UnsupportedOperationExceptions where appropriate, instead of
* WotonomyExceptions.
*
* Revision 1.1 2006/02/16 13:19:57 cgruber Check in all sources in
* eclipse-friendly maven-enabled packages.
*
* Revision 1.2 2003/08/06 23:07:52 chochos general code cleanup (mostly,
* removing unused imports)
*
* Revision 1.1 2001/11/18 18:57:10 mpowers Implemented EOGenericRecord.
*
*
*/
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