| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license |
| * agreements. See the NOTICE file distributed with this work for additional information regarding |
| * copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the License. You may obtain a |
| * copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License |
| * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| * or implied. See the License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package org.apache.geode.cache.query.internal; |
| |
| import java.util.List; |
| |
| import org.apache.geode.cache.query.SelectResults; |
| import org.apache.geode.cache.query.Struct; |
| import org.apache.geode.cache.query.internal.types.StructTypeImpl; |
| import org.apache.geode.cache.query.types.ObjectType; |
| |
| /** |
| * This is a helper class which contains informaion on how to expand / cutdown index results for |
| * making it compatible with the query. |
| */ |
| class IndexCutDownExpansionHelper { |
| |
| /** |
| * booelan which identifies if a cutdown of index results is needed or not. |
| */ |
| boolean cutDownNeeded = false; |
| |
| /** |
| * A SelectResults ( ResultBag or StructBag) object used to prevent unnecessary expansion of index |
| * results as described in IndexConditionalHelper class. |
| */ |
| SelectResults checkSet = null; |
| |
| /** |
| * ObjectType for the checkSet object ( An ObjectType for a ResultBag & StructType for a |
| * StructBag) |
| */ |
| ObjectType checkType = null; |
| |
| int checkSize = -1; |
| |
| IndexCutDownExpansionHelper(List checkList, ExecutionContext context) { |
| cutDownNeeded = checkList != null && (checkSize = checkList.size()) > 0; |
| if (cutDownNeeded) { |
| Boolean orderByClause = (Boolean) context.cacheGet(CompiledValue.CAN_APPLY_ORDER_BY_AT_INDEX); |
| boolean useLinkedDataStructure = false; |
| boolean nullValuesAtStart = true; |
| if (orderByClause != null && orderByClause) { |
| List orderByAttrs = (List) context.cacheGet(CompiledValue.ORDERBY_ATTRIB); |
| useLinkedDataStructure = orderByAttrs.size() == 1; |
| nullValuesAtStart = !((CompiledSortCriterion) orderByAttrs.get(0)).getCriterion(); |
| } |
| if (checkSize > 1) { |
| |
| checkType = QueryUtils.createStructTypeForRuntimeIterators(checkList); |
| if (useLinkedDataStructure) { |
| checkSet = context.isDistinct() ? new LinkedStructSet((StructTypeImpl) checkType) |
| : new SortedResultsBag<Struct>((StructTypeImpl) checkType, nullValuesAtStart); |
| } else { |
| checkSet = QueryUtils.createStructCollection(context, (StructTypeImpl) checkType); |
| } |
| } else { |
| checkType = ((RuntimeIterator) checkList.get(0)).getElementType(); |
| if (useLinkedDataStructure) { |
| checkSet = context.isDistinct() ? new LinkedResultSet(checkType) |
| : new SortedResultsBag(checkType, nullValuesAtStart); |
| } else { |
| checkSet = QueryUtils.createResultCollection(context, checkType); |
| } |
| } |
| } |
| } |
| } |