AccelerationData.java

package net.sf.openrocket.simulation;

import net.sf.openrocket.util.Coordinate;
import net.sf.openrocket.util.Quaternion;

public final class AccelerationData {

	private Coordinate linearAccelerationRC;
	private Coordinate rotationalAccelerationRC;
	private Coordinate linearAccelerationWC;
	private Coordinate rotationalAccelerationWC;
	// Rotates from rocket coordinates to world coordinates
	private final Quaternion rotation;
	
	
	public AccelerationData(Coordinate linearAccelerationRC, Coordinate rotationalAccelerationRC,
			Coordinate linearAccelerationWC, Coordinate rotationalAccelerationWC,
			Quaternion rotation) {
		
		if ((linearAccelerationRC == null && linearAccelerationWC == null) ||
				(rotationalAccelerationRC == null && rotationalAccelerationWC == null) ||
				rotation == null) {
			throw new IllegalArgumentException("Parameter is null: " +
					" linearAccelerationRC=" + linearAccelerationRC +
					" linearAccelerationWC=" + linearAccelerationWC +
					" rotationalAccelerationRC=" + rotationalAccelerationRC +
					" rotationalAccelerationWC=" + rotationalAccelerationWC +
					" rotation=" + rotation);
		}
		this.linearAccelerationRC = linearAccelerationRC;
		this.rotationalAccelerationRC = rotationalAccelerationRC;
		this.linearAccelerationWC = linearAccelerationWC;
		this.rotationalAccelerationWC = rotationalAccelerationWC;
		this.rotation = rotation;
	}

	
	
	
	public Coordinate getLinearAccelerationRC() {
		if (linearAccelerationRC == null) {
			linearAccelerationRC = rotation.invRotate(linearAccelerationWC);
		}
		return linearAccelerationRC;
	}

	public Coordinate getRotationalAccelerationRC() {
		if (rotationalAccelerationRC == null) {
			rotationalAccelerationRC = rotation.invRotate(rotationalAccelerationWC);
		}
		return rotationalAccelerationRC;
	}

	public Coordinate getLinearAccelerationWC() {
		if (linearAccelerationWC == null) {
			linearAccelerationWC = rotation.rotate(linearAccelerationRC);
		}
		return linearAccelerationWC;
	}

	public Coordinate getRotationalAccelerationWC() {
		if (rotationalAccelerationWC == null) {
			rotationalAccelerationWC = rotation.rotate(rotationalAccelerationRC);
		}
		return rotationalAccelerationWC;
	}

	public Quaternion getRotation() {
		return rotation;
	}




	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!(obj instanceof AccelerationData))
			return false;
		AccelerationData other = (AccelerationData) obj;
		return (this.getLinearAccelerationRC().equals(other.getLinearAccelerationRC()) && 
				this.getRotationalAccelerationRC().equals(other.getRotationalAccelerationRC()));
	}
	
	@Override
	public int hashCode() {
		return getLinearAccelerationRC().hashCode() ^ getRotationalAccelerationRC().hashCode();
	}

}