Bump to 4.5.0, add reverseDirectedEdge

CHANGELOG.md

@@ -6,6 +6,11 @@ file [H3Core.java](./src/main/java/com/uber/h3core/H3Core.java), and support
 for the Linux x64 and Darwin x64 platforms.
 
 ## Unreleased Changes
+### Added
+- `reverseDirectedEdge` function. (#207)
+
+### Changed
+- Upgraded the core library to v4.5.0. (#207)
 
 ## [4.4.0] - 2025-12-12
 ### Added

README.md

@@ -6,7 +6,7 @@
 [![Coverage Status](https://coveralls.io/repos/github/uber/h3-java/badge.svg?branch=master)](https://coveralls.io/github/uber/h3-java?branch=master)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.uber/h3/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.uber/h3)
-[![H3 Version](https://img.shields.io/badge/h3-v4.4.1-blue.svg)](https://github.com/uber/h3/releases/tag/v4.4.1)
+[![H3 Version](https://img.shields.io/badge/h3-v4.5.0-blue.svg)](https://github.com/uber/h3/releases/tag/v4.5.0)
 
 This library provides Java bindings for the [H3 Core Library](https://github.com/uber/h3). For API reference, please see the [H3 Documentation](https://h3geo.org/).
 
@@ -18,14 +18,14 @@ Add it to your pom.xml:
 <dependency>
     <groupId>com.uber</groupId>
     <artifactId>h3</artifactId>
-    <version>4.4.0</version>
+    <version>4.5.0</version>
 </dependency>
 ```
 
 Or, using Gradle:
 
 ```gradle
-compile("com.uber:h3:4.4.0")
+compile("com.uber:h3:4.5.0")
 ```
 
 Encode a location into a hexagon address:

h3version.properties

@@ -1 +1 @@
-h3.git.reference=v4.4.1
+h3.git.reference=v4.5.0

src/main/c/h3-java/src/jniapi.c

@@ -1394,6 +1394,23 @@ Java_com_uber_h3core_NativeMethods_directedEdgeToBoundary(JNIEnv *env,
     }
 }
 
+/*
+ * Class:     com_uber_h3core_NativeMethods
+ * Method:    reverseDirectedEdge
+ * Signature: (J)J
+ */
+JNIEXPORT jlong JNICALL Java_com_uber_h3core_NativeMethods_reverseDirectedEdge(
+    JNIEnv *env, jobject thiz, jlong h3) {
+    H3Index out;
+    H3Error err = reverseDirectedEdge(h3, &out);
+    if (err) {
+        ThrowH3Exception(env, err);
+        return -1;
+    }
+
+    return out;
+}
+
 /*
  * Class:     com_uber_h3core_NativeMethods
  * Method:    maxFaceCount

src/main/java/com/uber/h3core/H3Core.java

@@ -1228,6 +1228,16 @@ public List<LatLng> directedEdgeToBoundary(String h3) {
     return directedEdgeToBoundary(stringToH3(h3));
   }
 
+  /** Returns the directed edge with origin and destination cells reversed. */
+  public long reverseDirectedEdge(long h3) {
+    return h3Api.reverseDirectedEdge(h3);
+  }
+
+  /** Returns the directed edge with origin and destination cells reversed. */
+  public String reverseDirectedEdge(String h3) {
+    return h3ToString(reverseDirectedEdge(stringToH3(h3)));
+  }
+
   /**
    * Find all icosahedron faces intersected by a given H3 index, represented as integers from 0-19.
    *

src/main/java/com/uber/h3core/NativeMethods.java

@@ -140,6 +140,8 @@ native void polygonToCells(
 
   native int directedEdgeToBoundary(long h3, double[] verts);
 
+  native long reverseDirectedEdge(long h3);
+
   native int maxFaceCount(long h3);
 
   native void getIcosahedronFaces(long h3, int[] faces);

src/test/java/com/uber/h3core/TestDirectedEdges.java

@@ -60,6 +60,10 @@ void unidirectionalEdges() {
 
     List<LatLng> boundary = h3.directedEdgeToBoundary(edge);
     assertEquals(2, boundary.size());
+
+    String reversed = h3.reverseDirectedEdge(edge);
+    assertEquals(adjacent, h3.getDirectedEdgeOrigin(reversed));
+    assertEquals(start, h3.getDirectedEdgeDestination(reversed));
   }
 
   @Test