content: package org.apache.lucene.search.vectorhighlight;
  
  /**
   * 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 java.text.BreakIterator;
  
  /**
   * A {@link BoundaryScanner} implementation that uses {@link BreakIterator} to find
   * boundaries in the text.
   * @see BreakIterator
   */
  public class BreakIteratorBoundaryScanner implements BoundaryScanner {
    
    final BreakIterator bi;
  
    public BreakIteratorBoundaryScanner(BreakIterator bi){
      this.bi = bi;
    }
  
    public int findStartOffset(StringBuilder buffer, int start) {
      // avoid illegal start offset
      if( start > buffer.length() || start < 1 ) return start;
      bi.setText(buffer.substring(0, start));
      bi.last();
      return bi.previous();
    }
  
    public int findEndOffset(StringBuilder buffer, int start) {
      // avoid illegal start offset
      if( start > buffer.length() || start < 0 ) return start;
      bi.setText(buffer.substring(start));
      return bi.next() + start;
    }
  }
  