| /* |
| * 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.lucene.search; |
| |
| |
| import java.io.IOException; |
| import java.util.Objects; |
| |
| import org.apache.lucene.index.DocValues; |
| import org.apache.lucene.index.FieldInfo; |
| import org.apache.lucene.index.LeafReader; |
| import org.apache.lucene.index.LeafReaderContext; |
| |
| /** |
| * A {@link Query} that matches documents that have a value for a given field |
| * as reported by doc values iterators. |
| */ |
| public final class DocValuesFieldExistsQuery extends Query { |
| |
| private final String field; |
| |
| /** Create a query that will match documents which have a value for the given |
| * {@code field}. */ |
| public DocValuesFieldExistsQuery(String field) { |
| this.field = Objects.requireNonNull(field); |
| } |
| |
| public String getField() { |
| return field; |
| } |
| |
| @Override |
| public boolean equals(Object other) { |
| return sameClassAs(other) && |
| field.equals(((DocValuesFieldExistsQuery) other).field); |
| } |
| |
| @Override |
| public int hashCode() { |
| return 31 * classHash() + field.hashCode(); |
| } |
| |
| @Override |
| public String toString(String field) { |
| return "DocValuesFieldExistsQuery [field=" + this.field + "]"; |
| } |
| |
| @Override |
| public void visit(QueryVisitor visitor) { |
| if (visitor.acceptField(field)) { |
| visitor.visitLeaf(this); |
| } |
| } |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) { |
| return new ConstantScoreWeight(this, boost) { |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| DocIdSetIterator iterator = getDocValuesDocIdSetIterator(field, context.reader()); |
| if (iterator == null) { |
| return null; |
| } |
| return new ConstantScoreScorer(this, score(), scoreMode, iterator); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return DocValues.isCacheable(ctx, field); |
| } |
| |
| }; |
| } |
| |
| /** |
| * Returns a {@link DocIdSetIterator} from the given field or null if the field doesn't exist |
| * in the reader or if the reader has no doc values for the field. |
| */ |
| public static DocIdSetIterator getDocValuesDocIdSetIterator(String field, LeafReader reader) throws IOException { |
| FieldInfo fieldInfo = reader.getFieldInfos().fieldInfo(field); |
| final DocIdSetIterator iterator; |
| if (fieldInfo != null) { |
| switch (fieldInfo.getDocValuesType()) { |
| case NONE: |
| iterator = null; |
| break; |
| case NUMERIC: |
| iterator = reader.getNumericDocValues(field); |
| break; |
| case BINARY: |
| iterator = reader.getBinaryDocValues(field); |
| break; |
| case SORTED: |
| iterator = reader.getSortedDocValues(field); |
| break; |
| case SORTED_NUMERIC: |
| iterator = reader.getSortedNumericDocValues(field); |
| break; |
| case SORTED_SET: |
| iterator = reader.getSortedSetDocValues(field); |
| break; |
| default: |
| throw new AssertionError(); |
| } |
| return iterator; |
| } |
| return null; |
| } |
| } |