+++ /dev/null
-package org.apache.lucene.search;
-
-/**
- * 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.
- */
-
-import java.io.IOException;
-import java.util.ArrayList;
-
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.search.BooleanClause.Occur;
-import org.apache.lucene.util.OpenBitSet;
-import org.apache.lucene.util.OpenBitSetDISI;
-
-/**
- * A container Filter that allows Boolean composition of Filters.
- * Filters are allocated into one of three logical constructs;
- * SHOULD, MUST NOT, MUST
- * The results Filter BitSet is constructed as follows:
- * SHOULD Filters are OR'd together
- * The resulting Filter is NOT'd with the NOT Filters
- * The resulting Filter is AND'd with the MUST Filters
- */
-
-public class BooleanFilter extends Filter
-{
- ArrayList<Filter> shouldFilters = null;
- ArrayList<Filter> notFilters = null;
- ArrayList<Filter> mustFilters = null;
-
- private DocIdSetIterator getDISI(ArrayList<Filter> filters, int index, IndexReader reader)
- throws IOException
- {
- return filters.get(index).getDocIdSet(reader).iterator();
- }
-
- /**
- * Returns the a DocIdSetIterator representing the Boolean composition
- * of the filters that have been added.
- */
- @Override
- public DocIdSet getDocIdSet(IndexReader reader) throws IOException
- {
- OpenBitSetDISI res = null;
-
- if (shouldFilters != null) {
- for (int i = 0; i < shouldFilters.size(); i++) {
- if (res == null) {
- res = new OpenBitSetDISI(getDISI(shouldFilters, i, reader), reader.maxDoc());
- } else {
- DocIdSet dis = shouldFilters.get(i).getDocIdSet(reader);
- if(dis instanceof OpenBitSet) {
- // optimized case for OpenBitSets
- res.or((OpenBitSet) dis);
- } else {
- res.inPlaceOr(getDISI(shouldFilters, i, reader));
- }
- }
- }
- }
-
- if (notFilters!=null) {
- for (int i = 0; i < notFilters.size(); i++) {
- if (res == null) {
- res = new OpenBitSetDISI(getDISI(notFilters, i, reader), reader.maxDoc());
- res.flip(0, reader.maxDoc()); // NOTE: may set bits on deleted docs
- } else {
- DocIdSet dis = notFilters.get(i).getDocIdSet(reader);
- if(dis instanceof OpenBitSet) {
- // optimized case for OpenBitSets
- res.andNot((OpenBitSet) dis);
- } else {
- res.inPlaceNot(getDISI(notFilters, i, reader));
- }
- }
- }
- }
-
- if (mustFilters!=null) {
- for (int i = 0; i < mustFilters.size(); i++) {
- if (res == null) {
- res = new OpenBitSetDISI(getDISI(mustFilters, i, reader), reader.maxDoc());
- } else {
- DocIdSet dis = mustFilters.get(i).getDocIdSet(reader);
- if(dis instanceof OpenBitSet) {
- // optimized case for OpenBitSets
- res.and((OpenBitSet) dis);
- } else {
- res.inPlaceAnd(getDISI(mustFilters, i, reader));
- }
- }
- }
- }
-
- if (res !=null)
- return finalResult(res, reader.maxDoc());
-
- return DocIdSet.EMPTY_DOCIDSET;
- }
-
- /** Provide a SortedVIntList when it is definitely smaller
- * than an OpenBitSet.
- * @deprecated Either use CachingWrapperFilter, or
- * switch to a different DocIdSet implementation yourself.
- * This method will be removed in Lucene 4.0
- */
- @Deprecated
- protected final DocIdSet finalResult(OpenBitSetDISI result, int maxDocs) {
- return result;
- }
-
- /**
- * Adds a new FilterClause to the Boolean Filter container
- * @param filterClause A FilterClause object containing a Filter and an Occur parameter
- */
-
- public void add(FilterClause filterClause)
- {
- if (filterClause.getOccur().equals(Occur.MUST)) {
- if (mustFilters==null) {
- mustFilters=new ArrayList<Filter>();
- }
- mustFilters.add(filterClause.getFilter());
- }
- if (filterClause.getOccur().equals(Occur.SHOULD)) {
- if (shouldFilters==null) {
- shouldFilters=new ArrayList<Filter>();
- }
- shouldFilters.add(filterClause.getFilter());
- }
- if (filterClause.getOccur().equals(Occur.MUST_NOT)) {
- if (notFilters==null) {
- notFilters=new ArrayList<Filter>();
- }
- notFilters.add(filterClause.getFilter());
- }
- }
-
- private boolean equalFilters(ArrayList<Filter> filters1, ArrayList<Filter> filters2)
- {
- return (filters1 == filters2) ||
- ((filters1 != null) && filters1.equals(filters2));
- }
-
- @Override
- public boolean equals(Object obj)
- {
- if (this == obj)
- return true;
-
- if ((obj == null) || (obj.getClass() != this.getClass()))
- return false;
-
- BooleanFilter other = (BooleanFilter)obj;
- return equalFilters(notFilters, other.notFilters)
- && equalFilters(mustFilters, other.mustFilters)
- && equalFilters(shouldFilters, other.shouldFilters);
- }
-
- @Override
- public int hashCode()
- {
- int hash=7;
- hash = 31 * hash + (null == mustFilters ? 0 : mustFilters.hashCode());
- hash = 31 * hash + (null == notFilters ? 0 : notFilters.hashCode());
- hash = 31 * hash + (null == shouldFilters ? 0 : shouldFilters.hashCode());
- return hash;
- }
-
- /** Prints a user-readable version of this query. */
- @Override
- public String toString()
- {
- StringBuilder buffer = new StringBuilder();
- buffer.append("BooleanFilter(");
- appendFilters(shouldFilters, "", buffer);
- appendFilters(mustFilters, "+", buffer);
- appendFilters(notFilters, "-", buffer);
- buffer.append(")");
- return buffer.toString();
- }
-
- private void appendFilters(ArrayList<Filter> filters, String occurString, StringBuilder buffer)
- {
- if (filters != null) {
- for (int i = 0; i < filters.size(); i++) {
- buffer.append(' ');
- buffer.append(occurString);
- buffer.append(filters.get(i).toString());
- }
- }
- }
-}
fnp / pylucene.git / blobdiff