committed Doug's Rocksim loader

[debian/openrocket] / src / net / sf / openrocket / file / rocksim / ParachuteHandler.java

diff --git a/src/net/sf/openrocket/file/rocksim/ParachuteHandler.java b/src/net/sf/openrocket/file/rocksim/ParachuteHandler.java
new file mode 100644 (file)
index 0000000..6f683a4
--- /dev/null
+++ b/src/net/sf/openrocket/file/rocksim/ParachuteHandler.java
@@ -0,0 +1,132 @@
+/*
+ * ParachuteHandler.java
+ */
+package net.sf.openrocket.file.rocksim;
+
+import net.sf.openrocket.aerodynamics.WarningSet;
+import net.sf.openrocket.file.simplesax.ElementHandler;
+import net.sf.openrocket.file.simplesax.PlainTextHandler;
+import net.sf.openrocket.material.Material;
+import net.sf.openrocket.rocketcomponent.BodyTube;
+import net.sf.openrocket.rocketcomponent.InnerTube;
+import net.sf.openrocket.rocketcomponent.Parachute;
+import net.sf.openrocket.rocketcomponent.RocketComponent;
+import org.xml.sax.SAXException;
+
+import java.util.HashMap;
+
+/**
+ * A SAX handler for Rocksim's Parachute XML type.
+ * <p/>
+ */
+class ParachuteHandler extends PositionDependentHandler<Parachute> {
+    /**
+     * The OpenRocket Parachute instance
+     */
+    private final Parachute chute;
+    /**
+     * The shroud line density.
+     */
+    private double shroudLineDensity = 0.0d;
+    
+    /**
+     * Constructor.
+     *
+     * @param c the parent component
+     * @throws IllegalArgumentException thrown if <code>c</code> is null
+     */
+    public ParachuteHandler(RocketComponent c) throws IllegalArgumentException {
+        if (c == null) {
+            throw new IllegalArgumentException("The parent of a parachute may not be null.");
+        }
+        chute = new Parachute();
+        c.addChild(chute);
+    }
+
+    @Override
+    public ElementHandler openElement(String element, HashMap<String, String> attributes, WarningSet warnings) {
+        return PlainTextHandler.INSTANCE;
+    }
+
+    @Override
+    public void closeElement(String element, HashMap<String, String> attributes, String content, WarningSet warnings)
+            throws SAXException {
+        super.closeElement(element, attributes, content, warnings);
+        try {
+            if ("Dia".equals(element)) {
+                chute.setDiameter(Double.parseDouble(content) / RocksimHandler.ROCKSIM_TO_OPENROCKET_LENGTH);
+                /* Rocksim doesn't have a packed parachute radius, so we approximate it. */
+                double packed;
+                RocketComponent parent = chute.getParent();
+                if (parent instanceof BodyTube) {
+                    packed = ((BodyTube) parent).getRadius() * 0.9;
+                }
+                else if (parent instanceof InnerTube) {
+                    packed = ((InnerTube) parent).getInnerRadius() * 0.9;
+                }
+                else {
+                    packed = chute.getDiameter() * 0.025;
+                }
+                chute.setRadius(packed);
+            }
+            if ("ShroudLineCount".equals(element)) {
+                chute.setLineCount(Math.max(0, Integer.parseInt(content)));
+            }
+            if ("ShroudLineLen".equals(element)) {
+                chute.setLineLength(Math.max(0, Double.parseDouble(
+                        content) / RocksimHandler.ROCKSIM_TO_OPENROCKET_LENGTH));
+            }
+            if ("SpillHoleDia".equals(element)) {
+                //Not supported in OpenRocket
+                double spillHoleRadius = Double.parseDouble(content) / RocksimHandler.ROCKSIM_TO_OPENROCKET_RADIUS;
+                warnings.add("Parachute spill holes are not supported. Ignoring.");
+            }
+            if ("ShroudLineMassPerMM".equals(element)) {
+                shroudLineDensity = Double.parseDouble(content) * 10d/ RocksimHandler.ROCKSIM_TO_OPENROCKET_DENSITY;
+            }
+            if ("ShroudLineMaterial".equals(element)) {
+                chute.setLineMaterial(BaseHandler.createCustomMaterial(Material.Type.LINE, content, shroudLineDensity));
+            }
+            if ("DragCoefficient".equals(element)) {
+                chute.setCD(Double.parseDouble(content));
+            }
+            if ("Material".equals(element)) {
+                setMaterialName(content);
+            }
+        }
+        catch (NumberFormatException nfe) {
+            warnings.add("Could not convert " + element + " value of " + content + ".  It is expected to be a number.");
+        }
+    }
+
+    /**
+     * Get the component this handler is working upon.
+     *
+     * @return a component
+     */
+    public Parachute getComponent() {
+        return chute;
+    }
+
+    /**
+     * Set the relative position onto the component.  This cannot be done directly because setRelativePosition is not
+     * public in all components.
+     *
+     * @param position the OpenRocket position
+     */
+    public void setRelativePosition(RocketComponent.Position position) {
+        chute.setRelativePosition(position);
+    }
+
+    /**
+     * Get the required type of material for this component.
+     *
+     * @return BULK
+     */
+    @Override
+    public Material.Type getMaterialType() {
+        return Material.Type.SURFACE;
+    }
+
+}
+