org.elasticsearch.common.lucene.docset.AllDocIdSet Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.common.lucene.docset;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.util.Bits;
import java.io.IOException;
/**
* A {@link DocIdSet} that matches all docs up to a {@code maxDoc}.
*/
public class AllDocIdSet extends DocIdSet {
private final int maxDoc;
public AllDocIdSet(int maxDoc) {
this.maxDoc = maxDoc;
}
/**
* Does not go to the reader and ask for data, so can be cached.
*/
@Override
public boolean isCacheable() {
return true;
}
@Override
public DocIdSetIterator iterator() throws IOException {
return new Iterator(maxDoc);
}
@Override
public Bits bits() throws IOException {
return new Bits.MatchAllBits(maxDoc);
}
public static final class Iterator extends DocIdSetIterator {
private final int maxDoc;
private int doc = -1;
public Iterator(int maxDoc) {
this.maxDoc = maxDoc;
}
@Override
public int docID() {
return doc;
}
@Override
public int nextDoc() throws IOException {
if (++doc < maxDoc) {
return doc;
}
return doc = NO_MORE_DOCS;
}
@Override
public int advance(int target) throws IOException {
doc = target;
if (doc < maxDoc) {
return doc;
}
return doc = NO_MORE_DOCS;
}
@Override
public long cost() {
return maxDoc;
}
}
}