org.apache.lucene.search.RangeDocIdStream Maven / Gradle / Ivy

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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.

There is a newer version: 6.4.2_1

/*
 * 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;

final class RangeDocIdStream extends DocIdStream {

  private int upTo;
  private final int max;

  RangeDocIdStream(int min, int max) {
    if (max < min) {
      throw new IllegalArgumentException("min = " + min + " > max = " + max);
    }
    this.upTo = min;
    this.max = max;
  }

  @Override
  public boolean mayHaveRemaining() {
    return upTo < max;
  }

  @Override
  public void forEach(int upTo, CheckedIntConsumer consumer) throws IOException {
    if (upTo > this.upTo) {
      upTo = Math.min(upTo, max);
      for (int doc = this.upTo; doc < upTo; ++doc) {
        consumer.accept(doc);
      }
      this.upTo = upTo;
    }
  }

  @Override
  public int count(int upTo) throws IOException {
    if (upTo > this.upTo) {
      upTo = Math.min(upTo, max);
      int count = upTo - this.upTo;
      this.upTo = upTo;
      return count;
    } else {
      return 0;
    }
  }
}