content: package org.apache.lucene.search.spans;
  /**
   * Copyright 2005 The Apache Software Foundation
   *
   * Licensed 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.index.Term;
  import org.apache.lucene.index.TermPositions;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.Collection;
  
  /**
   * Expert:
   * Public for extension only
   */
  public class TermSpans extends Spans {
    protected TermPositions positions;
    protected Term term;
    protected int doc;
    protected int freq;
    protected int count;
    protected int position;
  
  
    public TermSpans(TermPositions positions, Term term) throws IOException {
  
      this.positions = positions;
      this.term = term;
      doc = -1;
    }
  
    @Override
    public boolean next() throws IOException {
      if (count == freq) {
        if (!positions.next()) {
          doc = Integer.MAX_VALUE;
          return false;
        }
        doc = positions.doc();
        freq = positions.freq();
        count = 0;
      }
      position = positions.nextPosition();
      count++;
      return true;
    }
  
    @Override
    public boolean skipTo(int target) throws IOException {
      if (!positions.skipTo(target)) {
        doc = Integer.MAX_VALUE;
        return false;
      }
  
      doc = positions.doc();
      freq = positions.freq();
      count = 0;
  
      position = positions.nextPosition();
      count++;
  
      return true;
    }
  
    @Override
    public int doc() {
      return doc;
    }
  
    @Override
    public int start() {
      return position;
    }
  
    @Override
    public int end() {
      return position + 1;
    }
  
    // TODO: Remove warning after API has been finalized
    @Override
    public Collection<byte[]> getPayload() throws IOException {
      byte [] bytes = new byte[positions.getPayloadLength()]; 
      bytes = positions.getPayload(bytes, 0);
      return Collections.singletonList(bytes);
    }
  
    // TODO: Remove warning after API has been finalized
    @Override
    public boolean isPayloadAvailable() {
      return positions.isPayloadAvailable();
    }
  
    @Override
    public String toString() {
      return "spans(" + term.toString() + ")@" +
              (doc == -1 ? "START" : (doc == Integer.MAX_VALUE) ? "END" : doc + "-" + position);
    }
  
  
    public TermPositions getPositions() {
      return positions;
    }
  }
  