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Lucene example source code file (SpanPositionRangeQuery.java)

This example Lucene source code file (SpanPositionRangeQuery.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

acceptstatus, io, ioexception, object, object, override, override, spanpositioncheckquery, spanpositionrangequery, spanpositionrangequery, string, stringbuilder, stringbuilder

The Lucene SpanPositionRangeQuery.java source code

package org.apache.lucene.search.spans;
/**
 * 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.
 */


import org.apache.lucene.util.ToStringUtils;

import java.io.IOException;


/**
 * Checks to see if the {@link #getMatch()} lies between a start and end position
 *
 * @see org.apache.lucene.search.spans.SpanFirstQuery for a derivation that is optimized for the case where start position is 0
 */
public class SpanPositionRangeQuery extends SpanPositionCheckQuery {
  protected int start = 0;
  protected int end;

  public SpanPositionRangeQuery(SpanQuery match, int start, int end) {
    super(match);
    this.start = start;
    this.end = end;
  }


  @Override
  protected AcceptStatus acceptPosition(Spans spans) throws IOException {
    assert spans.start() != spans.end();
    if (spans.start() >= end)
      return AcceptStatus.NO_AND_ADVANCE;
    else if (spans.start() >= start && spans.end() <= end)
      return AcceptStatus.YES;
    else
      return AcceptStatus.NO;
  }


  /**
   * @return The minimum position permitted in a match
   */
  public int getStart() {
    return start;
  }

  /**
   * @return the maximum end position permitted in a match.
   */
  public int getEnd() {
    return end;
  }

  @Override
  public String toString(String field) {
    StringBuilder buffer = new StringBuilder();
    buffer.append("spanPosRange(");
    buffer.append(match.toString(field));
    buffer.append(", ").append(start).append(", ");
    buffer.append(end);
    buffer.append(")");
    buffer.append(ToStringUtils.boost(getBoost()));
    return buffer.toString();
  }

  @Override
  public Object clone() {
    SpanPositionRangeQuery result = new SpanPositionRangeQuery((SpanQuery) match.clone(), start, end);
    result.setBoost(getBoost());
    return result;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (!(o instanceof SpanPositionRangeQuery)) return false;

    SpanPositionRangeQuery other = (SpanPositionRangeQuery)o;
    return this.end == other.end && this.start == other.start
         && this.match.equals(other.match)
         && this.getBoost() == other.getBoost();
  }

  @Override
  public int hashCode() {
    int h = match.hashCode();
    h ^= (h << 8) | (h >>> 25);  // reversible
    h ^= Float.floatToRawIntBits(getBoost()) ^ end ^ start;
    return h;
  }

}

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