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Diffstat (limited to 'projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EOKeyValueQualifier.java')
| -rw-r--r-- | projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EOKeyValueQualifier.java | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EOKeyValueQualifier.java b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EOKeyValueQualifier.java new file mode 100644 index 0000000..799955e --- /dev/null +++ b/projects/net.wotonomy.persistence/src/main/java/net/wotonomy/control/EOKeyValueQualifier.java @@ -0,0 +1,233 @@ +/* +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. + * + * + */ + + |