Add TransportMethod def

appinventor/components/src/com/google/appinventor/components/common/TransportMethod.java

@@ -0,0 +1,41 @@
+// -*- mode: java; c-basic-offset: 2; -*-
+// Copyright 2020 MIT, All rights reserved
+// Released under the Apache License, Version 2.0
+// http://www.apache.org/licenses/LICENSE-2.0
+
+package com.google.appinventor.components.common;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Defines a TransportMethod type used by the Navigation component.
+ */
+public enum TransportMethod implements OptionList<String> {
+  Foot("foot-walking"),
+  Car("driving-car"),
+  Bicycle("cycling-regular"),
+  Wheelchair("wheelchair");
+
+  private String value;
+
+  TransportMethod(String value) {
+    this.value = value;
+  }
+
+  public String toUnderlyingValue() {
+    return value;
+  }
+
+  private static final Map<String, TransportMethod> lookup = new HashMap<>();
+
+  static {
+    for(TransportMethod method : TransportMethod.values()) {
+      lookup.put(method.toUnderlyingValue(), method);
+    }
+  }
+
+  public static TransportMethod fromUnderlyingValue(String method) {
+    return lookup.get(method);
+  }
+}