/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.search;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.elasticsearch.common.lucene.docset.GetDocSet;

import java.io.IOException;

public class LimitFilter extends NoCacheFilter {

    private final int limit;

    public LimitFilter(int limit) {
        this.limit = limit;
    }

    public int getLimit() {
        return limit;
    }

    @Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
        return new LimitDocSet(reader.maxDoc(), limit);
    }

    public static class LimitDocSet extends GetDocSet {

        private final int limit;
        private int counter;

        public LimitDocSet(int maxDoc, int limit) {
            super(maxDoc);
            this.limit = limit;
        }

        @Override public boolean get(int doc) throws IOException {
            if (++counter > limit) {
                return false;
            }
            return true;
        }
    }
}
@@ -1102,16 +1102,41 @@
 t limit;
+%0A    private int counter;
 %0A%0A    pu
@@ -1332,32 +1332,98 @@
 s IOException %7B%0A
+        if (counter %3E limit) %7B%0A            return null;%0A        %7D%0A
         return n
@@ -1484,15 +1484,8 @@
 lic 
-static 
 clas
@@ -1555,37 +1555,8 @@
 mit;
-%0A        private int counter;
 %0A%0A  

fix limit filter to properly handle cross segments cases