org.elasticsearch.common.lucene.docset.MatchDocIdSetIterator 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.DocIdSetIterator;
import java.io.IOException;
/**
*/
public abstract class MatchDocIdSetIterator extends DocIdSetIterator {
private final int maxDoc;
private int doc = -1;
public MatchDocIdSetIterator(int maxDoc) {
this.maxDoc = maxDoc;
}
protected abstract boolean matchDoc(int doc);
@Override
public int docID() {
return doc;
}
@Override
public int nextDoc() throws IOException {
do {
doc++;
if (doc >= maxDoc) {
return doc = NO_MORE_DOCS;
}
} while (!matchDoc(doc));
return doc;
}
@Override
public int advance(int target) throws IOException {
if (target >= maxDoc) {
return doc = NO_MORE_DOCS;
}
doc = target;
while (!matchDoc(doc)) {
doc++;
if (doc >= maxDoc) {
return doc = NO_MORE_DOCS;
}
}
return doc;
}
}