// BSD License (http://www.galagosearch.org/license)

 package org.galagosearch.core.util;

 import org.galagosearch.core.retrieval.structured.Extent;

 /**

  * @author trevor

  */

 public class ExtentArray {

     Extent[] _array;

     int _position;

     public ExtentArray(int capacity) {

         _array = new Extent[capacity];

         for(int i=0; i<_array.length; i++)

             _array[i] = new Extent();

         _position = 0;

     }

     public ExtentArray() {

         this(16);

     }

     private void makeRoomForOneObject() {

         if(_position == _array.length) {

             // grow array if we're out of space

             _array = _copyArray(_array.length * 2);

         }

     }

     public void add(Extent value) {

         makeRoomForOneObject();

         _array[_position] = value;

         _position += 1;

     }

     public void add(int document, int begin, int end) {

         add(document, begin, end, 1);

     }

     public void add(int document, int begin, int end, double weight) {

         makeRoomForOneObject();

         Extent e = _array[_position];

         e.document = document;

         e.begin = begin;

         e.end = end;

         e.weight = weight;

         _position += 1;

     }

     public Extent[] getBuffer() {

         return _array;

     }

     public int getPosition() {

         return _position;

     }

     private Extent[] _copyArray(int newSize) {

         Extent[] result = new Extent[newSize];

         System.arraycopy(_array, 0, result, 0, _position);

         for(int i=_position; i<result.length; i++)

             result[i] = new Extent();

         return result;

     }

     public Extent[] toArray() {

         return _copyArray(_position);

     }

     public void reset() {

         _position = 0;

     }

 }