committed Doug's Rocksim loader

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

diff --git a/src/net/sf/openrocket/file/rocksim/PositionDependentHandler.java b/src/net/sf/openrocket/file/rocksim/PositionDependentHandler.java
new file mode 100644 (file)
index 0000000..9d45722
--- /dev/null
+++ b/src/net/sf/openrocket/file/rocksim/PositionDependentHandler.java
@@ -0,0 +1,80 @@
+/*
+ * PositionDependentHandler.java
+ */
+package net.sf.openrocket.file.rocksim;
+
+import net.sf.openrocket.aerodynamics.WarningSet;
+import net.sf.openrocket.rocketcomponent.RocketComponent;
+import org.xml.sax.SAXException;
+
+import java.util.HashMap;
+
+/**
+ * An abstract base class that handles position dependencies for all lower level components that 
+ * are position aware.
+ */
+public abstract class PositionDependentHandler<C extends RocketComponent> extends BaseHandler<C> {
+
+    /** Temporary position value. */
+    private Double positionValue;
+    
+    /** Temporary position. */
+    private RocketComponent.Position position;
+
+    @Override
+    public void closeElement(String element, HashMap<String, String> attributes, String content, WarningSet warnings)
+            throws SAXException {
+        super.closeElement(element, attributes, content, warnings);
+        if ("Xb".equals(element)) {
+            positionValue = Double.parseDouble(content) / RocksimHandler.ROCKSIM_TO_OPENROCKET_LENGTH;
+        }
+        if ("LocationMode".equals(element)) {
+            position = RocksimLocationMode.fromCode(Integer.parseInt(
+                    content)).asOpenRocket();
+        }
+    }
+    
+    /**
+     * This method sets the position information onto the component.  Rocksim splits the location/position
+     * information into two disparate data elements.  Both pieces of data are necessary to map into OpenRocket's
+     * position model.
+     * 
+     * @param element     the element name
+     * @param attributes  the attributes
+     * @param content     the content of the element
+     * @param warnings        the warning set to store warnings in.
+     * @throws org.xml.sax.SAXException  not thrown
+     */
+    @Override
+    public void endHandler(String element, HashMap<String, String> attributes,
+                           String content, WarningSet warnings) throws SAXException {
+        super.endHandler(element, attributes, content, warnings);
+        setRelativePosition(position);
+        setLocation(getComponent(), position, positionValue);
+    }
+
+    /**
+     * 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
+     */
+    protected abstract void setRelativePosition(RocketComponent.Position position);
+    
+    /**
+     * Set the position of a component.
+     * 
+     * @param component  the component
+     * @param position   the relative position
+     * @param location   the actual position value
+     */
+    public static void setLocation(RocketComponent component, RocketComponent.Position position, double location) {
+        if (position.equals(RocketComponent.Position.BOTTOM)) {
+            component.setPositionValue(-1d * location);
+        }
+        else {
+            component.setPositionValue(location);
+        }
+    }
+    
+}