001 /*
002 * Cumulus4j - Securing your data in the cloud - http://cumulus4j.org
003 * Copyright (C) 2011 NightLabs Consulting GmbH
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program. If not, see <http://www.gnu.org/licenses/>.
017 */
018 package org.cumulus4j.store.query.method;
019
020 import java.util.Collection;
021 import java.util.HashMap;
022 import java.util.HashSet;
023 import java.util.Map;
024 import java.util.Set;
025
026 import javax.jdo.Query;
027
028 import org.cumulus4j.store.crypto.CryptoContext;
029 import org.cumulus4j.store.model.ClassMeta;
030 import org.cumulus4j.store.model.FieldMeta;
031 import org.cumulus4j.store.model.IndexEntry;
032 import org.cumulus4j.store.model.IndexEntryFactory;
033 import org.cumulus4j.store.model.IndexValue;
034 import org.cumulus4j.store.query.QueryEvaluator;
035 import org.cumulus4j.store.query.eval.ExpressionHelper;
036 import org.cumulus4j.store.query.eval.InvokeExpressionEvaluator;
037 import org.cumulus4j.store.query.eval.PrimaryExpressionResolver;
038 import org.cumulus4j.store.query.eval.ResultDescriptor;
039 import org.datanucleus.query.expression.Expression;
040 import org.datanucleus.query.expression.PrimaryExpression;
041 import org.datanucleus.store.ExecutionContext;
042
043 /**
044 * Evaluator for "Date.getMonth() {oper} {compareTo}".
045 */
046 public class DateGetMonthEvaluator extends AbstractMethodEvaluator {
047
048 /* (non-Javadoc)
049 * @see org.cumulus4j.store.query.method.AbstractMethodEvaluator#requiresComparisonArgument()
050 */
051 @Override
052 public boolean requiresComparisonArgument() {
053 return true;
054 }
055
056 /* (non-Javadoc)
057 * @see org.cumulus4j.store.query.method.MethodEvaluator#evaluate(org.cumulus4j.store.query.QueryEvaluator, org.cumulus4j.store.query.eval.InvokeExpressionEvaluator, org.datanucleus.query.expression.Expression, org.cumulus4j.store.query.eval.ResultDescriptor)
058 */
059 @Override
060 public Set<Long> evaluate(QueryEvaluator queryEval,
061 InvokeExpressionEvaluator invokeExprEval, Expression invokedExpr,
062 ResultDescriptor resultDesc) {
063 if (invokeExprEval.getExpression().getArguments().size() != 0)
064 throw new IllegalStateException("Date.getMonth(...) expects no arguments, but there are " +
065 invokeExprEval.getExpression().getArguments().size());
066
067 if (invokedExpr instanceof PrimaryExpression) {
068 return new MethodResolver(invokeExprEval, queryEval, (PrimaryExpression) invokedExpr,
069 compareToArgument, resultDesc.isNegated()).query();
070 }
071 else {
072 if (!invokeExprEval.getLeft().getResultSymbols().contains(resultDesc.getSymbol()))
073 return null;
074
075 return queryEvaluate(invokeExprEval, queryEval, resultDesc.getFieldMeta(),
076 compareToArgument, resultDesc.isNegated());
077 }
078 }
079
080 private Set<Long> queryEvaluate(
081 InvokeExpressionEvaluator invokeExprEval,
082 QueryEvaluator queryEval,
083 FieldMeta fieldMeta,
084 Object compareToArgument, // the yyy in 'getMonth() >= yyy'
085 boolean negate
086 ) {
087 CryptoContext cryptoContext = queryEval.getCryptoContext();
088 ExecutionContext executionContext = queryEval.getExecutionContext();
089 IndexEntryFactory indexEntryFactory = queryEval.getStoreManager().getIndexFactoryRegistry().getIndexEntryFactory(
090 executionContext, fieldMeta, true
091 );
092
093 Query q = queryEval.getPersistenceManagerForIndex().newQuery(indexEntryFactory.getIndexEntryClass());
094 q.setFilter(
095 "this.keyStoreRefID == :keyStoreRefID && this.fieldMeta == :fieldMeta && this.indexKey.getMonth() " +
096 ExpressionHelper.getOperatorAsJDOQLSymbol(invokeExprEval.getParent().getExpression().getOperator(), negate) +
097 " :compareToArgument"
098 );
099 Map<String, Object> params = new HashMap<String, Object>(2);
100 params.put("keyStoreRefID", cryptoContext.getKeyStoreRefID());
101 params.put("fieldMeta", fieldMeta);
102 params.put("compareToArgument", compareToArgument);
103
104 @SuppressWarnings("unchecked")
105 Collection<? extends IndexEntry> indexEntries = (Collection<? extends IndexEntry>) q.executeWithMap(params);
106
107 Set<Long> result = new HashSet<Long>();
108 for (IndexEntry indexEntry : indexEntries) {
109 IndexValue indexValue = queryEval.getEncryptionHandler().decryptIndexEntry(cryptoContext, indexEntry);
110 result.addAll(indexValue.getDataEntryIDs());
111 }
112 q.closeAll();
113 return result;
114 }
115
116 private class MethodResolver extends PrimaryExpressionResolver
117 {
118 private InvokeExpressionEvaluator invokeExprEval;
119 private Object compareToArgument;
120 private boolean negate;
121
122 public MethodResolver(
123 InvokeExpressionEvaluator invokeExprEval,
124 QueryEvaluator queryEvaluator, PrimaryExpression primaryExpression,
125 Object compareToArgument,
126 boolean negate
127 )
128 {
129 super(queryEvaluator, primaryExpression);
130 this.invokeExprEval = invokeExprEval;
131 this.compareToArgument = compareToArgument;
132 this.negate = negate;
133 }
134
135 @Override
136 protected Set<Long> queryEnd(FieldMeta fieldMeta, ClassMeta classMeta) {
137 return queryEvaluate(invokeExprEval, queryEvaluator, fieldMeta, compareToArgument, negate);
138 }
139 }
140 }