org.elasticsearch.common.lucene.docset.AllDocIdSet Maven / Gradle / Ivy
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* Licensed to Elasticsearch 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;
}
}
}