WrappedVec.java

package water.fvec;

import water.*;

/**
 * A simple wrapper over another Vec.  Transforms either data values or rows.
 */
abstract class WrappedVec extends Vec {
  /** A key for underlying vector which contains values which are transformed by this vector. */
  final Key<Vec> _masterVecKey;
  /** Cached instances of underlying vector. */
  transient Vec _masterVec;


  public WrappedVec(Key<Vec> key, int rowLayout, Key<Vec> masterVecKey ) {
    this(key, rowLayout, null, masterVecKey);
  }
  public WrappedVec(Key<Vec> key, int rowLayout, String[] domain, Key<Vec> masterVecKey) {
    super(key, rowLayout, domain);
    _masterVecKey = masterVecKey;
  }

  public Vec masterVec() {
    return _masterVec != null ? _masterVec : (_masterVec = _masterVecKey.get());
  }

  /** Map from chunk-index to Chunk.  These wrappers are making custom Chunks */
  public abstract Chunk chunkForChunkIdx(int cidx);
}