feat: EncodedValue interface for sparse data, custom model parsing

Author: takb

core/src/main/java/com/graphhopper/routing/ev/SparseEncodedValue.java

@@ -0,0 +1,6 @@
+package com.graphhopper.routing.ev;
+
+public interface SparseEncodedValue<E> extends EncodedValue {
+    public E get(int edgeID);
+    public void set(int edgeID, Object value);
+}

core/src/main/java/com/graphhopper/routing/util/EncodingManager.java

@@ -435,7 +435,7 @@ private void addEncoder(AbstractFlagEncoder encoder) {
         edgeEncoders.add(encoder);
     }
 
-    private void addEncodedValue(EncodedValue ev, boolean withNamespace) {
+    public void addEncodedValue(EncodedValue ev, boolean withNamespace) {
         String normalizedKey = ev.getName().replaceAll(SPECIAL_SEPARATOR, "_");
         if (hasEncodedValue(normalizedKey))
             throw new IllegalStateException("EncodedValue " + ev.getName() + " collides with " + normalizedKey);

core/src/main/java/com/graphhopper/routing/weighting/custom/CustomModelParser.java

@@ -201,6 +201,11 @@ static boolean isValidVariableName(String name) {
     private static String getVariableDeclaration(EncodedValueLookup lookup, String arg) {
         if (lookup.hasEncodedValue(arg)) {
             EncodedValue enc = lookup.getEncodedValue(arg, EncodedValue.class);
+            // ORS MOD: SparseEncodedValues are not really encoded values, but are built to behave like them
+            if (enc.getClass().getSimpleName().contains("Sparse")) {
+                return "Object " + arg + " = ((SparseEncodedValue) this." + arg + "_enc).get(edge.getEdge());\n";
+            }
+            // ORS MOD END
             return getReturnType(enc) + " " + arg + " = reverse ? " +
                     "edge.getReverse((" + getInterface(enc) + ") this." + arg + "_enc) : " +
                     "edge.get((" + getInterface(enc) + ") this." + arg + "_enc);\n";