| /** |
| * 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 |
| * <p/> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p/> |
| * 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.atlas.catalog.query; |
| |
| import com.tinkerpop.pipes.Pipe; |
| import com.tinkerpop.pipes.filter.AndFilterPipe; |
| import com.tinkerpop.pipes.filter.OrFilterPipe; |
| import org.apache.atlas.catalog.definition.ResourceDefinition; |
| import org.apache.lucene.search.BooleanClause; |
| import org.apache.lucene.search.BooleanQuery; |
| |
| import java.util.*; |
| |
| /** |
| * Expression where operands are other expressions and operator is logical AND or OR |
| */ |
| public class BooleanQueryExpression extends BaseQueryExpression { |
| private final BooleanClause[] clauses; |
| private final QueryFactory queryFactory; |
| |
| public BooleanQueryExpression(BooleanQuery query, ResourceDefinition resourceDefinition, QueryFactory queryFactory) { |
| super(null, null, resourceDefinition); |
| clauses = query.getClauses(); |
| this.queryFactory = queryFactory; |
| } |
| |
| @Override |
| public Pipe asPipe() { |
| Map<BooleanClause.Occur, Collection<BooleanClause>> groupedClauses = groupClauses(); |
| |
| Pipe andPipe = null; |
| Collection<Pipe> andPipes = processAndClauses(groupedClauses); |
| andPipes.addAll(processNotClauses(groupedClauses)); |
| if (! andPipes.isEmpty()) { |
| andPipe = new AndFilterPipe(andPipes.toArray(new Pipe[andPipes.size()])); |
| } |
| |
| Collection<Pipe> orPipes = processOrClauses(groupedClauses); |
| if (! orPipes.isEmpty()) { |
| if (andPipe != null) { |
| orPipes.add(andPipe); |
| } |
| return new OrFilterPipe(orPipes.toArray(new Pipe[orPipes.size()])); |
| } else { |
| return andPipe; |
| } |
| } |
| |
| private Map<BooleanClause.Occur, Collection<BooleanClause>> groupClauses() { |
| Map<BooleanClause.Occur, Collection<BooleanClause>> groupedClauses = new HashMap<>(); |
| for (BooleanClause clause : clauses) { |
| BooleanClause.Occur occur = resolveClauseOccur(clause); |
| Collection<BooleanClause> clauseGrouping = groupedClauses.get(occur); |
| if (clauseGrouping == null) { |
| clauseGrouping = new ArrayList<>(); |
| groupedClauses.put(occur, clauseGrouping); |
| } |
| clauseGrouping.add(clause); |
| } |
| return groupedClauses; |
| } |
| |
| private BooleanClause.Occur resolveClauseOccur(BooleanClause clause) { |
| BooleanClause.Occur occur = clause.getOccur(); |
| if (negate) { |
| switch (occur) { |
| case SHOULD: |
| occur = BooleanClause.Occur.MUST_NOT; |
| break; |
| case MUST: |
| occur = BooleanClause.Occur.SHOULD; |
| break; |
| case MUST_NOT: |
| occur = BooleanClause.Occur.SHOULD; |
| break; |
| } |
| } |
| return occur; |
| } |
| |
| private Collection<Pipe> processAndClauses(Map<BooleanClause.Occur, Collection<BooleanClause>> groupedClauses) { |
| Collection<BooleanClause> andClauses = groupedClauses.get(BooleanClause.Occur.MUST); |
| Collection<Pipe> andPipes = new ArrayList<>(); |
| if (andClauses != null) { |
| for (BooleanClause andClause : andClauses) { |
| QueryExpression queryExpression = queryFactory.create(andClause.getQuery(), resourceDefinition); |
| properties.addAll(queryExpression.getProperties()); |
| andPipes.add(queryExpression.asPipe()); |
| } |
| } |
| return andPipes; |
| } |
| |
| |
| private Collection<Pipe> processOrClauses(Map<BooleanClause.Occur, Collection<BooleanClause>> groupedClauses) { |
| Collection<BooleanClause> shouldClauses = groupedClauses.get(BooleanClause.Occur.SHOULD); |
| Collection<Pipe> orPipes = new ArrayList<>(); |
| if (shouldClauses != null) { |
| for (BooleanClause shouldClause : shouldClauses) { |
| QueryExpression queryExpression = queryFactory.create(shouldClause.getQuery(), resourceDefinition); |
| // don't negate expression if we negated MUST_NOT -> SHOULD |
| if (negate && shouldClause.getOccur() != BooleanClause.Occur.MUST_NOT) { |
| queryExpression.setNegate(); |
| } |
| properties.addAll(queryExpression.getProperties()); |
| orPipes.add(queryExpression.asPipe()); |
| } |
| } |
| return orPipes; |
| } |
| |
| private Collection<Pipe> processNotClauses(Map<BooleanClause.Occur, Collection<BooleanClause>> groupedClauses) { |
| Collection<BooleanClause> notClauses = groupedClauses.get(BooleanClause.Occur.MUST_NOT); |
| Collection<Pipe> notPipes = new ArrayList<>(); |
| if (notClauses != null) { |
| for (BooleanClause notClause : notClauses) { |
| QueryExpression queryExpression = queryFactory.create(notClause.getQuery(), resourceDefinition); |
| queryExpression.setNegate(); |
| properties.addAll(queryExpression.getProperties()); |
| notPipes.add(queryExpression.asPipe()); |
| } |
| } |
| return notPipes; |
| } |
| } |