/* 
 * 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.
 */

using System;

namespace Lucene.Net.Index
{
    
    class SegmentTermPositionVector:SegmentTermVector, TermPositionVector
    {
        protected internal int[][] positions;
        protected internal TermVectorOffsetInfo[][] offsets;
        public static readonly int[] EMPTY_TERM_POS = new int[0];
        
        public SegmentTermPositionVector(System.String field, System.String[] terms, int[] termFreqs, int[][] positions, TermVectorOffsetInfo[][] offsets):base(field, terms, termFreqs)
        {
            this.offsets = offsets;
            this.positions = positions;
        }
        
        /// <summary> Returns an array of TermVectorOffsetInfo in which the term is found.
        /// 
        /// </summary>
        /// <param name="index">The position in the array to get the offsets from
        /// </param>
        /// <returns> An array of TermVectorOffsetInfo objects or the empty list
        /// </returns>
        /// <seealso cref="Lucene.Net.Analysis.Token">
        /// </seealso>
        public virtual TermVectorOffsetInfo[] GetOffsets(int index)
        {
            TermVectorOffsetInfo[] result = TermVectorOffsetInfo.EMPTY_OFFSET_INFO;
            if (offsets == null)
                return null;
            if (index >= 0 && index < offsets.Length)
            {
                result = offsets[index];
            }
            return result;
        }
        
        /// <summary> Returns an array of positions in which the term is found.
        /// Terms are identified by the index at which its number appears in the
        /// term String array obtained from the <c>indexOf</c> method.
        /// </summary>
        public virtual int[] GetTermPositions(int index)
        {
            int[] result = EMPTY_TERM_POS;
            if (positions == null)
                return null;
            if (index >= 0 && index < positions.Length)
            {
                result = positions[index];
            }
            
            return result;
        }
    }
}