/* Copyright 2002-2025 CS GROUP
    * Licensed to CS GROUP (CS) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * CS 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.
   */
  
  package org.orekit.frames;
  
  import org.hipparchus.CalculusFieldElement;
  import org.orekit.time.AbsoluteDate;
  import org.orekit.time.FieldAbsoluteDate;
  
  /** Utility for Transform providers.
   * @author Luc Maisonobe
   * @since 9.2
   */
  public class TransformProviderUtils {
  
      /** Identity provider.
       * <p>
       * The transforms generated by this providers are always {@link Transform#IDENTITY}.
       * </p>
       */
      public static final TransformProvider IDENTITY_PROVIDER = new TransformProvider() {
  
          /** {@inheritDoc}
           * <p>
           * Always returns {@link Transform#IDENTITY}
           * </p>
           */
          @Override
          public Transform getTransform(final AbsoluteDate date) {
              return Transform.IDENTITY;
          }
  
          /** {@inheritDoc} */
          @Override
          public StaticTransform getStaticTransform(final AbsoluteDate date) {
              return StaticTransform.getIdentity();
          }
  
          /** {@inheritDoc}
           * <p>
           * Always returns {@link FieldTransform#getIdentity(org.hipparchus.Field)}
           * </p>
           */
          @Override
          public <T extends CalculusFieldElement<T>> FieldTransform<T> getTransform(final FieldAbsoluteDate<T> date) {
              return FieldTransform.getIdentity(date.getField());
          }
  
          /** {@inheritDoc} */
          @Override
          public <T extends CalculusFieldElement<T>> FieldStaticTransform<T> getStaticTransform(final FieldAbsoluteDate<T> date) {
              return FieldStaticTransform.getIdentity(date.getField());
          }
      };
  
      /** Private constructor.
       * <p>This class is a utility class, it should neither have a public
       * nor a default constructor. This private constructor prevents
       * the compiler from generating one automatically.</p>
       */
      private TransformProviderUtils() {
      }
  
      /** Reverse a transform provider.
       * @param provider provider to reverse
       * @return a new provider which provide a transform similar to
       * {@code provider.getTransform(date).getInverse()}
       */
      public static TransformProvider getReversedProvider(final TransformProvider provider) {
          return new TransformProvider() {
  
              /** {@inheritDoc} */
              @Override
              public Transform getTransform(final AbsoluteDate date) {
                  return provider.getTransform(date).getInverse();
              }
  
              @Override
              public KinematicTransform getKinematicTransform(final AbsoluteDate date) {
                  return provider.getKinematicTransform(date).getInverse();
              }
  
              @Override
              public StaticTransform getStaticTransform(final AbsoluteDate date) {
                  return provider.getStaticTransform(date).getInverse();
             }
 
             /** {@inheritDoc} */
             @Override
             public <T extends CalculusFieldElement<T>> FieldTransform<T> getTransform(final FieldAbsoluteDate<T> date) {
                 return provider.getTransform(date).getInverse();
             }
 
             /** {@inheritDoc} */
             @Override
             public <T extends CalculusFieldElement<T>> FieldKinematicTransform<T> getKinematicTransform(final FieldAbsoluteDate<T> date) {
                 return provider.getKinematicTransform(date).getInverse();
             }
 
             /** {@inheritDoc} */
             @Override
             public <T extends CalculusFieldElement<T>> FieldStaticTransform<T> getStaticTransform(final FieldAbsoluteDate<T> date) {
                 return provider.getStaticTransform(date).getInverse();
             }
 
         };
     }
 
     /** Combine two transform providers.
      * @param first first provider to apply
      * @param second second provider to apply
      * @return a new provider which provide a transform similar to
      * {@code new Transform(date, first.getTransform(date), second.getTransform(date))}
      */
     public static TransformProvider getCombinedProvider(final TransformProvider first,
                                                         final TransformProvider second) {
         return new TransformProvider() {
             /** {@inheritDoc} */
             @Override
             public Transform getTransform(final AbsoluteDate date) {
                 return new Transform(date, first.getTransform(date), second.getTransform(date));
             }
 
             /** {@inheritDoc} */
             @Override
             public StaticTransform getStaticTransform(final AbsoluteDate date) {
                 return StaticTransform.compose(
                         date,
                         first.getStaticTransform(date),
                         second.getStaticTransform(date)
                 );
             }
 
             /** {@inheritDoc} */
             @Override
             public KinematicTransform getKinematicTransform(final AbsoluteDate date) {
                 return KinematicTransform.compose(
                         date,
                         first.getKinematicTransform(date),
                         second.getKinematicTransform(date)
                 );
             }
 
             /** {@inheritDoc} */
             @Override
             public <T extends CalculusFieldElement<T>> FieldTransform<T> getTransform(final FieldAbsoluteDate<T> date) {
                 return new FieldTransform<>(date, first.getTransform(date), second.getTransform(date));
             }
 
             /** {@inheritDoc} */
             @Override
             public <T extends CalculusFieldElement<T>> FieldKinematicTransform<T> getKinematicTransform(final FieldAbsoluteDate<T> date) {
                 return FieldKinematicTransform.compose(
                         date,
                         first.getKinematicTransform(date),
                         second.getKinematicTransform(date)
                 );
             }
 
             /** {@inheritDoc} */
             @Override
             public <T extends CalculusFieldElement<T>> FieldStaticTransform<T> getStaticTransform(final FieldAbsoluteDate<T> date) {
                 return FieldStaticTransform.compose(
                         date,
                         first.getStaticTransform(date),
                         second.getStaticTransform(date)
                 );
             }
 
         };
     }
 
 }