AttitudeProviderModifier.java

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package org.orekit.attitudes;


import org.hipparchus.CalculusFieldElement;
import org.hipparchus.geometry.euclidean.threed.FieldRotation;
import org.hipparchus.geometry.euclidean.threed.FieldVector3D;
import org.hipparchus.geometry.euclidean.threed.Rotation;
import org.hipparchus.geometry.euclidean.threed.Vector3D;
import org.orekit.frames.Frame;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.FieldAbsoluteDate;
import org.orekit.utils.AngularCoordinates;
import org.orekit.utils.FieldAngularCoordinates;
import org.orekit.utils.FieldPVCoordinatesProvider;
import org.orekit.utils.PVCoordinatesProvider;

/** This interface represents an attitude provider that modifies/wraps another underlying provider.
 * @author Luc Maisonobe
 * @since 5.1
 */
public interface AttitudeProviderModifier extends AttitudeProvider {

    /** Get the underlying attitude provider.
     * @return underlying attitude provider
     */
    AttitudeProvider getUnderlyingAttitudeProvider();

    /**
     * Wrap the input provider with a new one always returning attitudes with zero rotation rate and acceleration.
     * It is not physically sound, but remains useful for performance when a full, physical attitude with time derivatives is not needed.
     * @param attitudeProvider provider to wrap
     * @return wrapping provider
     * @since 12.1
     */
    static AttitudeProviderModifier getFrozenAttitudeProvider(final AttitudeProvider attitudeProvider) {
        return new AttitudeProviderModifier() {
            @Override
            public Attitude getAttitude(final PVCoordinatesProvider pvProv, final AbsoluteDate date, final Frame frame) {
                final Rotation rotation = attitudeProvider.getAttitudeRotation(pvProv, date, frame);
                final AngularCoordinates angularCoordinates = new AngularCoordinates(rotation, Vector3D.ZERO);
                return new Attitude(date, frame, angularCoordinates);
            }

            @Override
            public <T extends CalculusFieldElement<T>> FieldAttitude<T> getAttitude(final FieldPVCoordinatesProvider<T> pvProv, final FieldAbsoluteDate<T> date, final Frame frame) {
                final FieldRotation<T> rotation = attitudeProvider.getAttitudeRotation(pvProv, date, frame);
                final FieldAngularCoordinates<T> angularCoordinates = new FieldAngularCoordinates<>(rotation, FieldVector3D.getZero(date.getField()));
                return new FieldAttitude<>(date, frame, angularCoordinates);
            }

            @Override
            public AttitudeProvider getUnderlyingAttitudeProvider() {
                return attitudeProvider;
            }
        };
    }
}