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The NetCDF-Java Library is a Java interface to NetCDF files, as well as to many other types of scientific data formats.
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/*
 * Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
 *
 *   Portions of this software were developed by the Unidata Program at the
 *   University Corporation for Atmospheric Research.
 *
 *   Access and use of this software shall impose the following obligations
 *   and understandings on the user. The user is granted the right, without
 *   any fee or cost, to use, copy, modify, alter, enhance and distribute
 *   this software, and any derivative works thereof, and its supporting
 *   documentation for any purpose whatsoever, provided that this entire
 *   notice appears in all copies of the software, derivative works and
 *   supporting documentation.  Further, UCAR requests that the user credit
 *   UCAR/Unidata in any publications that result from the use of this
 *   software or in any product that includes this software. The names UCAR
 *   and/or Unidata, however, may not be used in any advertising or publicity
 *   to endorse or promote any products or commercial entity unless specific
 *   written permission is obtained from UCAR/Unidata. The user also
 *   understands that UCAR/Unidata is not obligated to provide the user with
 *   any support, consulting, training or assistance of any kind with regard
 *   to the use, operation and performance of this software nor to provide
 *   the user with any updates, revisions, new versions or "bug fixes."
 *
 *   THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "AS IS" AND ANY EXPRESS OR
 *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *   DISCLAIMED. IN NO EVENT SHALL UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
 *   INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
 *   FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 *   NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 *   WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
 */

package ucar.nc2.dataset;

import ucar.unidata.geoloc.vertical.*;
import ucar.nc2.Dimension;
import net.jcip.annotations.Immutable;


/**
 * A VerticalCT is a CoordinateTransform function CT: (GeoZ) -> Height or Pressure.
 * Typically it may be dependent also on X,Y and/or Time. CT: (X,Y,GeoZ,Time) -> Height or Pressure.
 * This class just records the transformation parameters. The mathematical transformation itself is
 * delegated to a class implementing ucar.unidata.geoloc.vertical.VerticalTransform.
 *
 * @author  caron
 */
@Immutable
public class VerticalCT extends CoordinateTransform {
   private final VerticalCT.Type type;
   private final CoordTransBuilderIF builder;

  /**
   * Create a Vertical Coordinate Transform.
   * @param name name of transform, must be unique within the dataset.
   * @param authority naming authority.
   * @param type type of vertical transform
   * @param builder creates the VerticalTransform
   */
  public VerticalCT (String name, String authority, VerticalCT.Type type, CoordTransBuilderIF builder) {
    super( name, authority, TransformType.Vertical);
    this.type = type;
    this.builder = builder;
  }

  /**
   * Copy Constructor
   * @param from copy from this one
   */
  public VerticalCT (VerticalCT from) {
    super( from.getName(), from.getAuthority(), from.getTransformType());
    this.type = from.getVerticalTransformType();
    this.builder = from.getBuilder();
  }

  /**
   * get the Vertical Transform type
   * @return the Vertical Transform Type
    */
  public VerticalCT.Type getVerticalTransformType() { return type; }

  /**
   * Use the builder to make the Vertical Transform function
   *
   * @param ds containing dataset
   * @param timeDim time Dimension
   * @return VerticalTransform
   * @see CoordTransBuilderIF#makeMathTransform
   */
  public VerticalTransform makeVerticalTransform(NetcdfDataset ds, Dimension timeDim) {
    return builder.makeMathTransform(ds, timeDim, this);
  }

  /** get the CoordTransBuilderIF
   * @return builder
   */
  public CoordTransBuilderIF getBuilder() { return builder; }

  @Override
  public String toString() {
    return "VerticalCT {" +
        "type=" + type +
        ", builder=" + builder.getTransformName() +
        '}';
  }


  //////////////////////////////////////////////////////////////////////////////////////////////////
  // inner class VerticalCT.Type
  private static final java.util.Map hash = new java.util.HashMap<>(10);

  /**
   * Enumeration of known Vertical transformations.
   */
  public static class Type {
    // These are from CF-1.0: not all are implemented because we dont have an example to test
    public final static Type Sigma = new Type("atmosphere_sigma");
    public final static Type HybridSigmaPressure = new Type("atmosphere_hybrid_sigma_pressure");
    public final static Type HybridHeight = new Type("atmosphere_hybrid_height");
    public final static Type Sleve = new Type("atmosphere_sleve");
    public final static Type OceanSigma = new Type("ocean_sigma");
    public final static Type OceanS = new Type("ocean_s");
    public final static Type OceanSigmaZ = new Type("ocean_sigma_z");

    // others
    public final static Type Existing3DField = new Type("Existing3DField");
    public final static Type WRFEta = new Type("WRFEta");

    //-Sachin 03/25/09
    public final static Type OceanSG1 = new Type("ocean_s_g1");
    public final static Type OceanSG2 = new Type("ocean_s_g2"); 

    private final String name;

    /** Constructor
     * @param s name of Type
     */
    public Type(String s) {
      this.name = s;
      hash.put( s, this);
    }

    /**
     * Find the VerticalCT.Type that matches this name.
     * @param name find this name
     * @return VerticalCT.Type or null if no match.
     */
    public static Type getType(String name) {
      if (name == null) return null;
      return hash.get( name);
    }
    public String toString() { return name; }
  }

}