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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2001 Michael Powers
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;
import net.wotonomy.foundation.NSMutableDictionary;
import net.wotonomy.foundation.NSSelector;
import net.wotonomy.foundation.internal.WotonomyException;
/**
* EOKeyValueQualifier performs a property-based
* comparison against a specified value. The comparison
* is specified in the form of a NSSelector. The
* selector is expected to take two arguments, the
* property value on an object and the comparison value,
* and return a Boolean indicating whether the object
* is qualified. EOQualifier defines selectors that
* may be used in creating EOKeyValueQualifiers.
*
* @author michael@mpowers.net
* @author yjcheung@intersectsoft.com
* @author $Author: cgruber $
* @version $Revision: 894 $
*/
public class EOKeyValueQualifier extends EOQualifier
implements EOKeyValueArchiving, EOQualifierEvaluation
{
private String key;
private NSSelector selector;
private Object value;
/**
* Constructor specifying a property key, a selector,
* and a value for comparison. The selector may be
* one of the constant selectors defined on EOQualifier.
*/
public EOKeyValueQualifier(
String aKey,
NSSelector aSelector,
Object aValue )
{
key = aKey;
selector = aSelector;
value = aValue;
}
/**
* Returns the key for this qualifier.
*/
public String key()
{
return key;
}
/**
* Returns the selector for this qualifier.
*/
public NSSelector selector()
{
return selector;
}
/**
* Returns the value for this qualifier.
*/
public Object value()
{
return value;
}
/**
* Evaluates this qualifier for the specified object,
* and returns whether the object is qualified.
* selector() is invoked on the value for key() on the
* specified object, with value() as the parameter.
*/
public boolean evaluateWithObject( Object anObject )
{
try
{
Object value;
if ( anObject instanceof EOKeyValueCoding )
{
value = ((EOKeyValueCoding)anObject).valueForKey( key() );
}
else
{
value = EOKeyValueCodingSupport.valueForKey( anObject, key() );
}
return ((Boolean)selector.invoke( value(), value)).booleanValue();
}
catch ( Exception exc )
{
throw new WotonomyException( exc );
}
}
/**
* Returns a string representation of this qualifier.
*/
public String toString()
{
return "( " + key + " " + selector + " " + value + " )";
}
public void encodeWithKeyValueArchiver(EOKeyValueArchiver arch) {
arch.encodeObject("EOKeyValueQualifier", "class");
arch.encodeObject(key, "key");
NSMutableDictionary d = new NSMutableDictionary(2);
if (value instanceof String)
d.setObjectForKey("NSString", "class");
else if (value instanceof java.math.BigDecimal)
d.setObjectForKey("NSDecimalNumber", "class");
else if (value instanceof Number)
d.setObjectForKey("NSNumber", "class");
else if (value instanceof NSKeyValueCoding.Null)
d.setObjectForKey("EONull", "class");
if (value != null && !(value instanceof NSKeyValueCoding.Null))
d.setObjectForKey(value.toString(), "value");
arch.encodeObject(d, "value");
String selname = null;
if (selector.equals(EOQualifier.QualifierOperatorCaseInsensitiveLike))
selname = "caseInsensitiveLike:";
else if (selector.equals(EOQualifier.QualifierOperatorContains))
selname = "contains:";
else if (selector.equals(EOQualifier.QualifierOperatorEqual))
selname = "isEqualTo:";
else if (selector.equals(EOQualifier.QualifierOperatorGreaterThan))
selname = "greaterThan:";
else if (selector.equals(EOQualifier.QualifierOperatorGreaterThanOrEqualTo))
selname = "greaterThanOrEqualTo:";
else if (selector.equals(EOQualifier.QualifierOperatorLessThan))
selname = "lessThan:";
else if (selector.equals(EOQualifier.QualifierOperatorLessThanOrEqualTo))
selname = "lessThanOrEqualTo:";
else if (selector.equals(EOQualifier.QualifierOperatorLike))
selname = "like:";
else if (selector.equals(EOQualifier.QualifierOperatorNotEqual))
selname = "isNotEqualTo:";
else
selname = selector.name() + ":";
arch.encodeObject(selname, "selectorName");
}
public static Object decodeWithKeyValueUnarchiver(EOKeyValueUnarchiver arch) {
String k = (String)arch.decodeObjectForKey("key");
Object v = arch.decodeObjectForKey("value");
NSSelector sel = null;
String sname = (String)arch.decodeObjectForKey("selectorName");
if (sname.equals("isEqualTo:"))
sel = EOQualifier.QualifierOperatorEqual;
else if (sname.equals("isNotEqualTo:"))
sel = EOQualifier.QualifierOperatorNotEqual;
else if (sname.equals("caseInsensitiveLike:"))
sel = EOQualifier.QualifierOperatorCaseInsensitiveLike;
else if (sname.equals("contains:"))
sel = EOQualifier.QualifierOperatorContains;
else if (sname.equals("greaterThan:"))
sel = EOQualifier.QualifierOperatorGreaterThan;
else if (sname.equals("greaterThanOrEqualTo:"))
sel = EOQualifier.QualifierOperatorGreaterThanOrEqualTo;
else if (sname.equals("lessThan:"))
sel = EOQualifier.QualifierOperatorLessThan;
else if (sname.equals("lessThanOrEqualTo:"))
sel = EOQualifier.QualifierOperatorLessThanOrEqualTo;
else if (sname.equals("like:"))
sel = EOQualifier.QualifierOperatorLike;
EOKeyValueQualifier q = new EOKeyValueQualifier(k, sel, v);
return q;
}
}
/*
* $Log$
* 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 1.10 2003/08/12 01:43:04 chochos
* formally implement EOQualifierEvaluation
*
* Revision 1.9 2003/08/11 19:39:30 chochos
* special conditions for NSKeyValueCoding.NullValue -> EONull
*
* Revision 1.8 2003/08/09 01:22:51 chochos
* qualifiers implement EOKeyValueArchiving
*
* Revision 1.7 2003/08/06 23:07:52 chochos
* general code cleanup (mostly, removing unused imports)
*
* Revision 1.6 2001/10/31 15:26:06 mpowers
* Fixed typo.
*
* Revision 1.5 2001/10/31 15:25:14 mpowers
* Cleanup of qualifiers.
*
* Revision 1.4 2001/10/30 22:57:28 mpowers
* EOQualifier framework is now working.
*
* Revision 1.3 2001/09/13 15:25:56 mpowers
* Started implementation of the EOQualifier framework.
*
* Revision 1.2 2001/03/29 03:29:49 mpowers
* Now using KeyValueCoding and Support instead of Introspector.
*
* Revision 1.1 2001/02/27 03:33:04 mpowers
* Initial draft of the key-value qualifier.
*
*
*/
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