/* Copyright (C) 2000-2003 SKYRIX Software AG This file is part of OGo OGo 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, or (at your option) any later version. OGo 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 OGo; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ // $Id$ #include "NGRuleContext.h" #include "NGRule.h" #include "NGRuleModel.h" #include "NSObject+Logs.h" #include "common.h" #include @implementation NGRuleContext + (id)ruleContextWithModelInUserDefault:(NSString *)_defName { NGRuleModel *mod; if ((mod = [NGRuleModel ruleModelWithContentsOfUserDefault:_defName]) == nil) return nil; return [self ruleContextWithModel:mod]; } + (id)ruleContextWithModel:(NGRuleModel *)_model { return [[[self alloc] initWithModel:_model] autorelease]; } - (id)initWithModel:(NGRuleModel *)_model { if ((self = [super init])) { [self setModel:_model]; } return self; } - (id)init { return [self initWithModel:nil]; } - (void)dealloc { [self->model release]; [self->storedValues release]; [super dealloc]; } /* accessors */ - (void)setModel:(NGRuleModel *)_model { ASSIGN(self->model, _model); } - (NGRuleModel *)model { return self->model; } /* values */ - (void)takeStoredValue:(id)_value forKey:(NSString *)_key { if (_value) { if (self->storedValues == nil) self->storedValues = [[NSMutableDictionary alloc] initWithCapacity:32]; [self->storedValues setObject:_value forKey:_key]; } else [self->storedValues removeObjectForKey:_key]; } - (id)storedValueForKey:(NSString *)_key { return [self->storedValues objectForKey:_key]; } - (void)takeValue:(id)_value forKey:(NSString *)_key { [self takeStoredValue:_value forKey:_key]; } - (void)reset { [self->storedValues removeAllObjects]; } /* processing */ - (id)inferredValueForKey:(NSString *)_key { NSArray *rules; unsigned i, count; if (self->debugOn) [self debugWithFormat:@"calculate value for key: '%@'", _key]; /* select candidates */ rules = [[self model] candidateRulesForKey:_key]; if (self->debugOn) [self debugWithFormat:@" candidate rules: %@", rules]; /* check qualifiers */ for (i = 0, count = [rules count]; i < count; i++) { NGRule *rule; rule = [rules objectAtIndex:i]; if ([(id)[rule qualifier] evaluateWithObject:self]){ if (self->debugOn) [self debugWithFormat:@" rule %i matches: %@", i, rule]; return [[rule action] fireInContext:self]; } } if (self->debugOn) [self debugWithFormat:@" no rule matched !"]; return nil; } - (id)valueForKey:(NSString *)_key { id v; /* look for constants */ if ((v = [self->storedValues objectForKey:_key])) return v; /* look into rule system */ if ((v = [self inferredValueForKey:_key])) return v; return nil; } - (NSArray *)valuesForKeyPath:(NSString *)_kp takingSuccessiveValues:(NSArray *)_values forKeyPath:(NSString *)_valkp { NSMutableArray *results; unsigned i, count; count = [_values count]; results = [NSMutableArray arrayWithCapacity:count]; for (i = 0; i < count; i++) { id ruleValue; /* take the value */ [self takeValue:[_values objectAtIndex:i] forKeyPath:_valkp]; /* calculate the rule value */ ruleValue = [self valueForKey:_kp]; [results addObject:ruleValue ? ruleValue : [NSNull null]]; } return results; } /* debugging */ - (BOOL)isDebuggingEnabled { return self->debugOn; } - (void)setDebugEnabled:(BOOL)_flag { self->debugOn = _flag; } @end /* NGRuleContext */