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Lucene Queries Module
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/*
 * 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.queries.intervals;

import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import java.util.stream.Collectors;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.MatchesIterator;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.QueryVisitor;

class ExtendedIntervalsSource extends IntervalsSource {

  final IntervalsSource source;
  private final int before;
  private final int after;

  ExtendedIntervalsSource(IntervalsSource source, int before, int after) {
    this.source = source;
    this.before = before;
    this.after = after;
  }

  @Override
  public IntervalIterator intervals(String field, LeafReaderContext ctx) throws IOException {
    IntervalIterator in = source.intervals(field, ctx);
    if (in == null) {
      return null;
    }
    return new ExtendedIntervalIterator(in, before, after);
  }

  @Override
  public IntervalMatchesIterator matches(String field, LeafReaderContext ctx, int doc)
      throws IOException {
    IntervalMatchesIterator in = source.matches(field, ctx, doc);
    if (in == null) {
      return null;
    }

    IntervalMatchesIterator inNoOffsets =
        new IntervalMatchesIterator() {
          IntervalMatchesIterator delegate = in;

          @Override
          public int gaps() {
            return delegate.gaps();
          }

          @Override
          public int width() {
            return delegate.width();
          }

          @Override
          public boolean next() throws IOException {
            return delegate.next();
          }

          @Override
          public int startPosition() {
            return delegate.startPosition();
          }

          @Override
          public int endPosition() {
            return delegate.endPosition();
          }

          @Override
          public int startOffset() throws IOException {
            // We could return this:
            // before > 0 ? -1 : in.startOffset();
            // but keep it consistent for start/end offset:
            return -1;
          }

          @Override
          public int endOffset() throws IOException {
            // We could return this:
            // after > 0 ? -1 : in.startOffset();
            // but keep it consistent for start/end offset:
            return -1;
          }

          @Override
          public MatchesIterator getSubMatches() throws IOException {
            return delegate.getSubMatches();
          }

          @Override
          public Query getQuery() {
            return delegate.getQuery();
          }
        };

    IntervalIterator wrapped =
        new ExtendedIntervalIterator(IntervalMatches.wrapMatches(inNoOffsets, doc), before, after);
    return IntervalMatches.asMatches(wrapped, inNoOffsets, doc);
  }

  @Override
  public void visit(String field, QueryVisitor visitor) {
    source.visit(field, visitor);
  }

  @Override
  public int minExtent() {
    int minExtent = before + source.minExtent() + after;
    if (minExtent < 0) {
      return Integer.MAX_VALUE;
    }
    return minExtent;
  }

  @Override
  public Collection pullUpDisjunctions() {
    Collection inner = source.pullUpDisjunctions();
    if (inner.size() == 0) {
      return Collections.singleton(this);
    }
    return inner.stream()
        .map(s -> new ExtendedIntervalsSource(s, before, after))
        .collect(Collectors.toSet());
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    ExtendedIntervalsSource that = (ExtendedIntervalsSource) o;
    return before == that.before && after == that.after && Objects.equals(source, that.source);
  }

  @Override
  public int hashCode() {
    return Objects.hash(source, before, after);
  }

  @Override
  public String toString() {
    return "EXTEND(" + source + "," + before + "," + after + ")";
  }
}