content: package org.opencv.core;
  
  import java.util.Arrays;
  import java.util.List;
  
  import org.opencv.core.DMatch;
  
  public class MatOfDMatch extends Mat {
      // 32FC4
      private static final int _depth = CvType.CV_32F;
      private static final int _channels = 4;
  
      public MatOfDMatch() {
          super();
      }
  
      protected MatOfDMatch(long addr) {
          super(addr);
          if( !empty() && checkVector(_channels, _depth) < 0 )
              throw new IllegalArgumentException("Incompatible Mat: " + toString());
          //FIXME: do we need release() here?
      }
  
      public static MatOfDMatch fromNativeAddr(long addr) {
          return new MatOfDMatch(addr);
      }
  
      public MatOfDMatch(Mat m) {
          super(m, Range.all());
          if( !empty() && checkVector(_channels, _depth) < 0 )
              throw new IllegalArgumentException("Incompatible Mat: " + toString());
          //FIXME: do we need release() here?
      }
  
      public MatOfDMatch(DMatch...ap) {
          super();
          fromArray(ap);
      }
  
      public void alloc(int elemNumber) {
          if(elemNumber>0)
              super.create(elemNumber, 1, CvType.makeType(_depth, _channels));
      }
  
  
      public void fromArray(DMatch...a) {
          if(a==null || a.length==0)
              return;
          int num = a.length;
          alloc(num);
          float buff[] = new float[num * _channels];
          for(int i=0; i<num; i++) {
              DMatch m = a[i];
              buff[_channels*i+0] = m.queryIdx;
              buff[_channels*i+1] = m.trainIdx;
              buff[_channels*i+2] = m.imgIdx;
              buff[_channels*i+3] = m.distance;
          }
          put(0, 0, buff); //TODO: check ret val!
      }
  
      public DMatch[] toArray() {
          int num = (int) total();
          DMatch[] a = new DMatch[num];
          if(num == 0)
              return a;
          float buff[] = new float[num * _channels];
          get(0, 0, buff); //TODO: check ret val!
          for(int i=0; i<num; i++)
              a[i] = new DMatch((int) buff[_channels*i+0], (int) buff[_channels*i+1], (int) buff[_channels*i+2], buff[_channels*i+3]);
          return a;
      }
  
      public void fromList(List<DMatch> ldm) {
          DMatch adm[] = ldm.toArray(new DMatch[0]);
          fromArray(adm);
      }
  
      public List<DMatch> toList() {
          DMatch[] adm = toArray();
          return Arrays.asList(adm);
      }
  }
  