+++ /dev/null
-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.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-
-import org.apache.lucene.search.vectorhighlight.FieldPhraseList.WeightedPhraseInfo;
-
-/**
- * A simple implementation of {@link FragListBuilder}.
- */
-public class SimpleFragListBuilder implements FragListBuilder {
-
- public static final int MARGIN = 6;
- public static final int MIN_FRAG_CHAR_SIZE = MARGIN * 3;
-
- public FieldFragList createFieldFragList(FieldPhraseList fieldPhraseList, int fragCharSize) {
- if( fragCharSize < MIN_FRAG_CHAR_SIZE )
- throw new IllegalArgumentException( "fragCharSize(" + fragCharSize + ") is too small. It must be " +
- MIN_FRAG_CHAR_SIZE + " or higher." );
-
- FieldFragList ffl = new FieldFragList( fragCharSize );
-
- List<WeightedPhraseInfo> wpil = new ArrayList<WeightedPhraseInfo>();
- Iterator<WeightedPhraseInfo> ite = fieldPhraseList.phraseList.iterator();
- WeightedPhraseInfo phraseInfo = null;
- int startOffset = 0;
- boolean taken = false;
- while( true ){
- if( !taken ){
- if( !ite.hasNext() ) break;
- phraseInfo = ite.next();
- }
- taken = false;
- if( phraseInfo == null ) break;
-
- // if the phrase violates the border of previous fragment, discard it and try next phrase
- if( phraseInfo.getStartOffset() < startOffset ) continue;
-
- wpil.clear();
- wpil.add( phraseInfo );
- int st = phraseInfo.getStartOffset() - MARGIN < startOffset ?
- startOffset : phraseInfo.getStartOffset() - MARGIN;
- int en = st + fragCharSize;
- if( phraseInfo.getEndOffset() > en )
- en = phraseInfo.getEndOffset();
- startOffset = en;
-
- while( true ){
- if( ite.hasNext() ){
- phraseInfo = ite.next();
- taken = true;
- if( phraseInfo == null ) break;
- }
- else
- break;
- if( phraseInfo.getEndOffset() <= en )
- wpil.add( phraseInfo );
- else
- break;
- }
- ffl.add( st, en, wpil );
- }
- return ffl;
- }
-
-}