preset component framework

src/net/sf/openrocket/motor/MotorDigest.java

@@ -7,6 +7,17 @@ import java.security.NoSuchAlgorithmException;
 import net.sf.openrocket.util.Coordinate;
 import net.sf.openrocket.util.TextUtil;
 
+/**
+ * A class that generated a "digest" of a motor.  A digest is a string value that
+ * uniquely identifies a motor (like a hash code or checksum).  Two motors that have
+ * the same digest behave similarly with a very high probability.  The digest can
+ * therefore be used to identify motors that otherwise have the same specifications.
+ * <p>
+ * The digest only uses a limited amount of precision, so that rounding errors won't
+ * cause differing digest results.
+ * 
+ * @author Sampo Niskanen <sampo.niskanen@iki.fi>
+ */
 public class MotorDigest {
 	
 	private static final double EPSILON = 0.00000000001;
@@ -27,13 +38,16 @@ public class MotorDigest {
 		
 		private final int order;
 		private final int multiplier;
+		
 		DataType(int order, int multiplier) {
 			this.order = order;
 			this.multiplier = multiplier;
 		}
+		
 		public int getOrder() {
 			return order;
 		}
+		
 		public int getMultiplier() {
 			return multiplier;
 		}
@@ -113,8 +127,7 @@ public class MotorDigest {
 	private byte[] bytes(int value) {
 		return new byte[] {
 				(byte) ((value >>> 24) & 0xFF), (byte) ((value >>> 16) & 0xFF),
-				(byte) ((value>>>8) & 0xFF), (byte) (value & 0xFF) 
-		};
+				(byte) ((value >>> 8) & 0xFF), (byte) (value & 0xFF) };
 	}
 	
 	

src/net/sf/openrocket/preset/ExternalComponentPreset.java

@@ -0,0 +1,29 @@
+package net.sf.openrocket.preset;
+
+import net.sf.openrocket.motor.Manufacturer;
+import net.sf.openrocket.rocketcomponent.RocketComponent;
+
+public class ExternalComponentPreset extends RocketComponentPreset {
+	
+	private final double mass;
+	private final String materialName;
+	
+	public ExternalComponentPreset(Class<? extends RocketComponent> componentClass, Manufacturer manufacturer, String partName,
+			String partNo, String partDescription, double mass, String materialName) {
+		super(componentClass, manufacturer, partName, partNo, partDescription);
+		
+		this.materialName = materialName;
+		this.mass = mass;
+	}
+	
+	
+	public String getMaterialName() {
+		return materialName;
+	}
+	
+	
+	public double getMass() {
+		return mass;
+	}
+	
+}

src/net/sf/openrocket/preset/RocketComponentPreset.java

@@ -0,0 +1,68 @@
+package net.sf.openrocket.preset;
+
+import net.sf.openrocket.motor.Manufacturer;
+import net.sf.openrocket.rocketcomponent.RocketComponent;
+
+/**
+ * A model for a preset component.
+ * <p>
+ * A preset component contains a component class type, manufacturer information,
+ * part information, and getter methods for various properties of the component.
+ * 
+ * @author Sampo Niskanen <sampo.niskanen@iki.fi>
+ */
+public abstract class RocketComponentPreset {
+	
+	private final Class<? extends RocketComponent> componentClass;
+	private final Manufacturer manufacturer;
+	private final String partName;
+	private final String partNo;
+	private final String partDescription;
+	
+	
+	public RocketComponentPreset(Class<? extends RocketComponent> componentClass, Manufacturer manufacturer,
+			String partName, String partNo, String partDescription) {
+		this.componentClass = componentClass;
+		this.manufacturer = manufacturer;
+		this.partName = partName;
+		this.partNo = partNo;
+		this.partDescription = partDescription;
+	}
+	
+	
+	/**
+	 * Return the component class that this preset defines.
+	 */
+	public Class<? extends RocketComponent> getComponentClass() {
+		return componentClass;
+	}
+	
+	/**
+	 * Return the manufacturer of this preset component.
+	 */
+	public Manufacturer getManufacturer() {
+		return manufacturer;
+	}
+	
+	/**
+	 * Return the part name.  This is a short, human-readable name of the part.
+	 */
+	public String getPartName() {
+		return partName;
+	}
+	
+	/**
+	 * Return the part number.  This is the part identifier (e.g. "BT-50").
+	 */
+	public String getPartNo() {
+		return partNo;
+	}
+	
+	/**
+	 * Return the part description.  This is a longer description of the component.
+	 */
+	public String getPartDescription() {
+		return partDescription;
+	}
+	
+}

src/net/sf/openrocket/rocketcomponent/ComponentChangeEvent.java

@@ -21,7 +21,7 @@ public class ComponentChangeEvent extends ChangeEvent {
 	public static final int UNDO_CHANGE = 16;
 	/** A change in the motor configurations or names */
 	public static final int MOTOR_CHANGE = 32;
-	/** A change in the events occurring during flight. */
+	/** A change that affects the events occurring during flight. */
 	public static final int EVENT_CHANGE = 64;
 	
 	/** A bit-field that contains all possible change types. */

src/net/sf/openrocket/rocketcomponent/ExternalComponent.java

@@ -4,6 +4,9 @@ import java.util.List;
 
 import net.sf.openrocket.l10n.Translator;
 import net.sf.openrocket.material.Material;
+import net.sf.openrocket.material.Material.Type;
+import net.sf.openrocket.preset.ExternalComponentPreset;
+import net.sf.openrocket.preset.RocketComponentPreset;
 import net.sf.openrocket.startup.Application;
 import net.sf.openrocket.unit.UnitGroup;
 import net.sf.openrocket.util.Prefs;
@@ -111,6 +114,7 @@ public abstract class ExternalComponent extends RocketComponent {
 		if (material.equals(mat))
 			return;
 		material = mat;
+		clearPreset();
 		fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
 	}
 	
@@ -126,6 +130,27 @@ public abstract class ExternalComponent extends RocketComponent {
 	}
 	
 	
+	@Override
+	protected void loadFromPreset(RocketComponentPreset preset) {
+		super.loadFromPreset(preset);
+		
+		ExternalComponentPreset p = (ExternalComponentPreset) preset;
+		String materialName = p.getMaterialName();
+		double mass = p.getMass();
+		
+		double volume = getComponentVolume();
+		double density;
+		if (volume > 0.00001) {
+			density = mass / volume;
+		} else {
+			density = 1000;
+		}
+		
+		Material mat = Material.newMaterial(Type.BULK, materialName, density, true);
+		setMaterial(mat);
+	}
+	
+	
 	@Override
 	protected List<RocketComponent> copyFrom(RocketComponent c) {
 		ExternalComponent src = (ExternalComponent) c;

src/net/sf/openrocket/rocketcomponent/RocketComponent.java

@@ -12,6 +12,7 @@ import javax.swing.event.ChangeListener;
 
 import net.sf.openrocket.l10n.Translator;
 import net.sf.openrocket.logging.LogHelper;
+import net.sf.openrocket.preset.RocketComponentPreset;
 import net.sf.openrocket.startup.Application;
 import net.sf.openrocket.util.ArrayList;
 import net.sf.openrocket.util.BugException;
@@ -123,6 +124,10 @@ public abstract class RocketComponent implements ChangeSource, Cloneable, Iterab
 	// Unique ID of the component
 	private String id = null;
 	
+	// Preset component this component is based upon
+	private RocketComponentPreset presetComponent = null;
+	
+
 	/**
 	 * Used to invalidate the component after calling {@link #copyFrom(RocketComponent)}.
 	 */
@@ -659,6 +664,89 @@ public abstract class RocketComponent implements ChangeSource, Cloneable, Iterab
 	
 	
 
+	/**
+	 * Return the preset component that this component is based upon.
+	 * 
+	 * @return	the preset component, or <code>null</code> if this is not based on a preset.
+	 */
+	public final RocketComponentPreset getPresetComponent() {
+		return presetComponent;
+	}
+	
+	/**
+	 * Set the preset component this component is based upon and load all of the 
+	 * preset values.
+	 * 
+	 * @param preset	the preset component to load, or <code>null</code> to clear the preset.
+	 */
+	public final void loadPreset(RocketComponentPreset preset) {
+		if (presetComponent == preset) {
+			return;
+		}
+		
+		if (preset == null) {
+			clearPreset();
+			return;
+		}
+		
+		if (preset.getComponentClass() != this.getClass()) {
+			throw new IllegalArgumentException("Attempting to load preset of type " + preset.getComponentClass()
+						+ " into component of type " + this.getClass());
+		}
+		
+		RocketComponent root = getRoot();
+		final Rocket rocket;
+		if (root instanceof Rocket) {
+			rocket = (Rocket) root;
+		} else {
+			rocket = null;
+		}
+		
+		try {
+			if (rocket != null) {
+				rocket.freeze();
+			}
+			
+			loadFromPreset(preset);
+			
+			this.presetComponent = preset;
+			fireComponentChangeEvent(ComponentChangeEvent.NONFUNCTIONAL_CHANGE);
+			
+		} finally {
+			if (rocket != null) {
+				rocket.thaw();
+			}
+		}
+	}
+	
+	
+	/**
+	 * Load component properties from the specified preset.  The preset is guaranteed
+	 * to be of the correct type.
+	 * <p>
+	 * This method should fire the appropriate events related to the changes.  The rocket
+	 * is frozen by the caller, so the events will be automatically combined.
+	 * 
+	 * @param preset	the preset to load from
+	 */
+	protected void loadFromPreset(RocketComponentPreset preset) {
+		// No-op
+	}
+	
+	
+	/**
+	 * Clear the current component preset.  This does not affect the component properties
+	 * otherwise.
+	 */
+	public final void clearPreset() {
+		if (presetComponent == null)
+			return;
+		presetComponent = null;
+		fireComponentChangeEvent(ComponentChangeEvent.NONFUNCTIONAL_CHANGE);
+	}
+	
+	
+
 	/**
 	 * Returns the unique ID of the component.
 	 *