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API 0.9.5
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00001 /* 00002 * CPExpression_subquery.j 00003 * 00004 * Created by cacaodev. 00005 * Copyright 2010. 00006 * 00007 * This library is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * This library is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with this library; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 00023 @implementation CPExpression_subquery : CPExpression 00024 { 00025 CPExpression _collection; 00026 CPExpression _variableExpression; 00027 CPPredicate _subpredicate; 00028 } 00029 00030 - (id)initWithExpression:(CPExpression)collection usingIteratorVariable:(CPString)variable predicate:(CPPredicate)subpredicate 00031 { 00032 var variableExpression = [CPExpression expressionForVariable:variable]; 00033 return [self initWithExpression:collection usingIteratorExpression:variableExpression predicate:subpredicate]; 00034 } 00035 00036 - (id)initWithExpression:(CPExpression)collection usingIteratorExpression:(CPExpression)variableExpression predicate:(CPPredicate)subpredicate 00037 { 00038 self = [super initWithExpressionType:CPSubqueryExpressionType]; 00039 00040 if (self) 00041 { 00042 _subpredicate = subpredicate; 00043 _collection = collection; 00044 _variableExpression = variableExpression; 00045 } 00046 return self; 00047 } 00048 00049 - (id)expressionValueWithObject:(id)object context:(id)context 00050 { 00051 var collection = [_collection expressionValueWithObject:object context:context], 00052 count = [collection count], 00053 result = [CPArray array], 00054 bindings = [CPDictionary dictionaryWithObject:[CPExpression expressionForEvaluatedObject] forKey:[self variable]], 00055 i = 0; 00056 00057 for (; i < count; i++) 00058 { 00059 var item = [collection objectAtIndex:i]; 00060 if ([_subpredicate evaluateWithObject:item substitutionVariables:bindings]) 00061 [result addObject:item]; 00062 } 00063 00064 return result; 00065 } 00066 00067 - (BOOL)isEqual:(id)object; 00068 { 00069 if (self === object) 00070 return YES; 00071 00072 if (![_collection isEqual:[object collection]] || ![_subpredicate isEqual:[object predicate]]) 00073 return NO; 00074 00075 return YES; 00076 } 00077 00078 - (CPExpression)collection 00079 { 00080 return _collection; 00081 } 00082 00083 - (id)copy 00084 { 00085 return [[CPExpression_subquery alloc] initWithExpression:[_collection copy] usingIteratorExpression:[_variableExpression copy] predicate:[_subpredicate copy]]; 00086 } 00087 00088 - (CPPredicate)predicate 00089 { 00090 return _subpredicate; 00091 } 00092 00093 - (CPString)description 00094 { 00095 return [self predicateFormat]; 00096 } 00097 00098 - (CPString)predicateFormat 00099 { 00100 return @"SUBQUERY(" + [_collection description] + ", " + [_variableExpression description] + ", " + [_subpredicate predicateFormat] + ")"; 00101 } 00102 00103 - (CPString)variable 00104 { 00105 return [_variableExpression variable]; 00106 } 00107 00108 - (CPExpression)variableExpression 00109 { 00110 return _variableExpression; 00111 } 00112 @end 00113 00114 var CPExpressionKey = @"CPExpression", 00115 CPSubpredicateKey = @"CPSubpredicate", 00116 CPVariableKey = @"CPVariable"; 00117 00118 @implementation CPExpression_subquery (CPCoding) 00119 00120 - (id)initWithCoder:(CPCoder)coder 00121 { 00122 var collection = [coder decodeObjectForKey:CPExpressionKey], 00123 subpredicate = [coder decodeObjectForKey:CPSubpredicateKey], 00124 variableExpression = [coder decodeObjectForKey:CPVariableKey]; 00125 00126 return [self initWithExpression:collection usingIteratorExpression:variableExpression predicate:subpredicate]; 00127 } 00128 00129 - (void)encodeWithCoder:(CPCoder)coder 00130 { 00131 [coder encodeObject:_collection forKey:CPExpressionKey]; 00132 [coder encodeObject:_subpredicate forKey:CPSubpredicateKey]; 00133 [coder encodeObject:_variableExpression forKey:CPVariableKey]; 00134 } 00135 00136 @end