[Java] Add OrtCompiledModelCompatibility and minor updates for OrtEpDevices (microsoft#26028)

### Description
Adds the Java bits mirroring microsoft#25878, and renames a few things in microsoft#25131
for uniformity with the other APIs.

### Motivation and Context
Java API parity.

Author: Craigacp

java/src/main/java/ai/onnxruntime/OrtEnvironment.java

@@ -488,6 +488,30 @@ public List<OrtEpDevice> getEpDevices() throws OrtException {
     return Collections.unmodifiableList(devicesList);
   }
 
+  /**
+   * Checks the supplied model info string against the list of {@link OrtEpDevice}s to see if the
+   * model is compatible.
+   *
+   * @param epDevices The EP-Device tuples to use.
+   * @param modelInfo The model info string to check.
+   * @return The model compatibility.
+   * @throws OrtException If the call failed.
+   */
+  public OrtCompiledModelCompatibility getModelCompatibilityForEpDevices(
+      List<OrtEpDevice> epDevices, String modelInfo) throws OrtException {
+    if (epDevices == null || epDevices.isEmpty()) {
+      throw new IllegalArgumentException("Must supply at least one OrtEpDevice");
+    }
+    long[] deviceHandles = new long[epDevices.size()];
+    for (int i = 0; i < epDevices.size(); i++) {
+      deviceHandles[i] = epDevices.get(i).getNativeHandle();
+    }
+
+    int output =
+        getModelCompatibilityForEpDevices(OnnxRuntime.ortApiHandle, deviceHandles, modelInfo);
+    return OrtCompiledModelCompatibility.mapFromInt(output);
+  }
+
   /**
    * Creates the native object.
    *
@@ -556,6 +580,18 @@ private static native void unregisterExecutionProviderLibrary(
    */
   private static native long[] getEpDevices(long apiHandle, long nativeHandle) throws OrtException;
 
+  /**
+   * Checks if a model is compatible with the supplied list of EP device handles.
+   *
+   * @param apiHandle The API handle to use.
+   * @param epHandles An array of OrtEpDevice handles.
+   * @param modelInfo The model info string.
+   * @return An int representing the {@link OrtCompiledModelCompatibility} value.
+   * @throws OrtException If the call failed.
+   */
+  private static native int getModelCompatibilityForEpDevices(
+      long apiHandle, long[] epHandles, String modelInfo) throws OrtException;
+
   /**
    * Closes the OrtEnvironment, frees the handle.
    *
@@ -580,6 +616,59 @@ private static native void setTelemetry(long apiHandle, long nativeHandle, boole
   @Override
   public void close() {}
 
+  /** Enum representing a compiled model's compatibility with a set of {@link OrtEpDevice}s. */
+  public enum OrtCompiledModelCompatibility {
+    /** The EP is not applicable for the model. */
+    EP_NOT_APPLICABLE(0),
+    /** The EP supports the model optimally. */
+    EP_SUPPORTED_OPTIMAL(1),
+    /** The EP supports the model, but the model would perform better if recompiled. */
+    EP_SUPPORTED_PREFER_RECOMPILATION(2),
+    /** The EP does not support the model. */
+    EP_UNSUPPORTED(3);
+
+    private final int value;
+
+    private static final Logger logger =
+        Logger.getLogger(OrtCompiledModelCompatibility.class.getName());
+    private static final OrtCompiledModelCompatibility[] values =
+        new OrtCompiledModelCompatibility[4];
+
+    static {
+      for (OrtCompiledModelCompatibility ot : OrtCompiledModelCompatibility.values()) {
+        values[ot.value] = ot;
+      }
+    }
+
+    OrtCompiledModelCompatibility(int value) {
+      this.value = value;
+    }
+
+    /**
+     * Gets the native value associated with this model compatibility value.
+     *
+     * @return The native value.
+     */
+    public int getValue() {
+      return value;
+    }
+
+    /**
+     * Maps from the C API's int enum to the Java enum.
+     *
+     * @param logLevel The index of the Java enum.
+     * @return The Java enum.
+     */
+    public static OrtCompiledModelCompatibility mapFromInt(int logLevel) {
+      if ((logLevel >= 0) && (logLevel < values.length)) {
+        return values[logLevel];
+      } else {
+        logger.warning("Unknown model compatibility " + logLevel + " setting to EP_UNSUPPORTED");
+        return EP_UNSUPPORTED;
+      }
+    }
+  }
+
   /**
    * Controls the global thread pools in the environment. Only used if the session is constructed
    * using an options with {@link OrtSession.SessionOptions#disablePerSessionThreads()} set.

java/src/main/java/ai/onnxruntime/OrtEpDevice.java

@@ -24,11 +24,11 @@ public final class OrtEpDevice {
    */
   OrtEpDevice(long nativeHandle) {
     this.nativeHandle = nativeHandle;
-    this.epName = getName(OnnxRuntime.ortApiHandle, nativeHandle);
-    this.epVendor = getVendor(OnnxRuntime.ortApiHandle, nativeHandle);
-    String[][] metadata = getMetadata(OnnxRuntime.ortApiHandle, nativeHandle);
+    this.epName = getEpName(OnnxRuntime.ortApiHandle, nativeHandle);
+    this.epVendor = getEpVendor(OnnxRuntime.ortApiHandle, nativeHandle);
+    String[][] metadata = getEpMetadata(OnnxRuntime.ortApiHandle, nativeHandle);
     this.epMetadata = OrtUtil.convertToMap(metadata);
-    String[][] options = getOptions(OnnxRuntime.ortApiHandle, nativeHandle);
+    String[][] options = getEpOptions(OnnxRuntime.ortApiHandle, nativeHandle);
     this.epOptions = OrtUtil.convertToMap(options);
     this.device = new OrtHardwareDevice(getDeviceHandle(OnnxRuntime.ortApiHandle, nativeHandle));
   }
@@ -43,38 +43,38 @@ long getNativeHandle() {
   }
 
   /**
-   * Gets the EP name.
+   * Gets the Execution Provider name.
    *
    * @return The EP name.
    */
-  public String getName() {
+  public String getEpName() {
     return epName;
   }
 
   /**
-   * Gets the vendor name.
+   * Gets the Execution Provider vendor name.
    *
-   * @return The vendor name.
+   * @return The EP vendor name.
    */
-  public String getVendor() {
+  public String getEpVendor() {
     return epVendor;
   }
 
   /**
-   * Gets an unmodifiable view on the EP metadata.
+   * Gets an unmodifiable view on the Execution Provider metadata.
    *
    * @return The EP metadata.
    */
-  public Map<String, String> getMetadata() {
+  public Map<String, String> getEpMetadata() {
     return epMetadata;
   }
 
   /**
-   * Gets an unmodifiable view on the EP options.
+   * Gets an unmodifiable view on the Execution Provider options.
    *
    * @return The EP options.
    */
-  public Map<String, String> getOptions() {
+  public Map<String, String> getEpOptions() {
     return epOptions;
   }
 
@@ -105,13 +105,13 @@ public String toString() {
         + '}';
   }
 
-  private static native String getName(long apiHandle, long nativeHandle);
+  private static native String getEpName(long apiHandle, long nativeHandle);
 
-  private static native String getVendor(long apiHandle, long nativeHandle);
+  private static native String getEpVendor(long apiHandle, long nativeHandle);
 
-  private static native String[][] getMetadata(long apiHandle, long nativeHandle);
+  private static native String[][] getEpMetadata(long apiHandle, long nativeHandle);
 
-  private static native String[][] getOptions(long apiHandle, long nativeHandle);
+  private static native String[][] getEpOptions(long apiHandle, long nativeHandle);
 
   private static native long getDeviceHandle(long apiHandle, long nativeHandle);
 }

java/src/main/native/OrtJniUtil.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2025 Oracle and/or its affiliates. All rights reserved.
  * Licensed under the MIT License.
  */
 #include <jni.h>
@@ -109,6 +109,42 @@ jint convertFromOrtSparseFormat(OrtSparseFormat format) {
     }
 }
 
+/**
+ * Must be kept in sync with convertToCompiledModelCompatibility.
+ */
+jint convertFromCompiledModelCompatibility(OrtCompiledModelCompatibility compat) {
+  switch (compat) {
+    case OrtCompiledModelCompatibility_EP_NOT_APPLICABLE:
+      return 0;
+    case OrtCompiledModelCompatibility_EP_SUPPORTED_OPTIMAL:
+      return 1;
+    case OrtCompiledModelCompatibility_EP_SUPPORTED_PREFER_RECOMPILATION:
+      return 2;
+    case OrtCompiledModelCompatibility_EP_UNSUPPORTED:
+      return 3;
+    default:
+      // if this value is observed the enum has changed and the code should be updated.
+      return -1;
+  }
+}
+
+/**
+ * Must be kept in sync with convertFromCompiledModelCompatibility.
+ */
+OrtCompiledModelCompatibility convertToCompiledModelCompatibility(jint compat) {
+  switch (compat) {
+    case 0:
+      return OrtCompiledModelCompatibility_EP_NOT_APPLICABLE;
+    case 1:
+      return OrtCompiledModelCompatibility_EP_SUPPORTED_OPTIMAL;
+    case 2:
+      return OrtCompiledModelCompatibility_EP_SUPPORTED_PREFER_RECOMPILATION;
+    case 3:
+    default:
+      return OrtCompiledModelCompatibility_EP_UNSUPPORTED;
+  }
+}
+
 /**
  * Must be kept in sync with convertToONNXDataFormat
  */

java/src/main/native/OrtJniUtil.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
  * Licensed under the MIT License.
  */
 #include <jni.h>
@@ -34,6 +34,10 @@ OrtSparseFormat convertToOrtSparseFormat(jint format);
 
 jint convertFromOrtSparseFormat(OrtSparseFormat format);
 
+jint convertFromCompiledModelCompatibility(OrtCompiledModelCompatibility compat);
+
+OrtCompiledModelCompatibility convertToCompiledModelCompatibility(jint compat);
+
 jint convertFromONNXDataFormat(ONNXTensorElementDataType type);
 
 ONNXTensorElementDataType convertToONNXDataFormat(jint type);

java/src/main/native/ai_onnxruntime_OrtEnvironment.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2019, 2025, Oracle and/or its affiliates. All rights reserved.
  * Licensed under the MIT License.
  */
 #include <jni.h>
@@ -130,6 +130,42 @@ JNIEXPORT jlongArray JNICALL Java_ai_onnxruntime_OrtEnvironment_getEpDevices
     }
 }
 
+/*
+ * Class:     ai_onnxruntime_OrtEnvironment
+ * Method:    getModelCompatibilityForEpDevices
+ * Signature: (J[JLjava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL Java_ai_onnxruntime_OrtEnvironment_getModelCompatibilityForEpDevices
+    (JNIEnv * jniEnv, jclass jobj, jlong apiHandle, jlongArray epHandles, jstring modelInfo) {
+  (void) jobj; // Required JNI parameter not needed by functions which don't need to access their host object.
+  const OrtApi* api = (const OrtApi*) apiHandle;
+
+  // convert pointers for EpDevice handles
+  jsize deviceCount = (*jniEnv)->GetArrayLength(jniEnv, epHandles);
+  const OrtEpDevice** devicePtrs = allocarray(deviceCount, sizeof(OrtEpDevice *));
+  jlong* deviceHandleElements = (*jniEnv)->GetLongArrayElements(jniEnv, epHandles, NULL);
+  for (jsize i = 0; i < deviceCount; i++) {
+    devicePtrs[i] = (OrtEpDevice*) deviceHandleElements[i];
+  }
+  (*jniEnv)->ReleaseLongArrayElements(jniEnv, epHandles, deviceHandleElements, JNI_ABORT);
+
+  // get utf-8 string
+  const char* modelStr = (*jniEnv)->GetStringUTFChars(jniEnv, modelInfo, NULL);
+
+  OrtCompiledModelCompatibility compatibility;
+  OrtErrorCode code = checkOrtStatus(jniEnv, api, api->GetModelCompatibilityForEpDevices(devicePtrs, deviceCount, modelStr, &compatibility));
+
+  // cleanup
+  (*jniEnv)->ReleaseStringUTFChars(jniEnv, modelInfo, modelStr);
+  free((void*)devicePtrs);
+  if (code != ORT_OK) {
+    return -1;
+  } else {
+    jint returnVal = convertFromCompiledModelCompatibility(compatibility);
+    return returnVal;
+  }
+}
+
 /*
  * Class:     ai_onnxruntime_OrtEnvironment
  * Method:    close

java/src/main/native/ai_onnxruntime_OrtEpDevice.c

@@ -12,7 +12,7 @@
  * Method:    getName
  * Signature: (JJ)Ljava/lang/String;
  */
-JNIEXPORT jstring JNICALL Java_ai_onnxruntime_OrtEpDevice_getName
+JNIEXPORT jstring JNICALL Java_ai_onnxruntime_OrtEpDevice_getEpName
   (JNIEnv * jniEnv, jclass jclazz, jlong apiHandle, jlong nativeHandle) {
   (void) jclazz; // Required JNI parameter not needed by functions which don't need to access their host object.
   const OrtApi* api = (const OrtApi*) apiHandle;
@@ -27,7 +27,7 @@ JNIEXPORT jstring JNICALL Java_ai_onnxruntime_OrtEpDevice_getName
  * Method:    getVendor
  * Signature: (JJ)Ljava/lang/String;
  */
-JNIEXPORT jstring JNICALL Java_ai_onnxruntime_OrtEpDevice_getVendor
+JNIEXPORT jstring JNICALL Java_ai_onnxruntime_OrtEpDevice_getEpVendor
   (JNIEnv * jniEnv, jclass jclazz, jlong apiHandle, jlong nativeHandle) {
   (void) jclazz; // Required JNI parameter not needed by functions which don't need to access their host object.
   const OrtApi* api = (const OrtApi*) apiHandle;
@@ -42,7 +42,7 @@ JNIEXPORT jstring JNICALL Java_ai_onnxruntime_OrtEpDevice_getVendor
  * Method:    getMetadata
  * Signature: (JJ)[[Ljava/lang/String;
  */
-JNIEXPORT jobjectArray JNICALL Java_ai_onnxruntime_OrtEpDevice_getMetadata
+JNIEXPORT jobjectArray JNICALL Java_ai_onnxruntime_OrtEpDevice_getEpMetadata
   (JNIEnv * jniEnv, jclass jclazz, jlong apiHandle, jlong nativeHandle) {
   (void) jclazz; // Required JNI parameter not needed by functions which don't need to access their host object.
   const OrtApi* api = (const OrtApi*) apiHandle;
@@ -57,7 +57,7 @@ JNIEXPORT jobjectArray JNICALL Java_ai_onnxruntime_OrtEpDevice_getMetadata
  * Method:    getOptions
  * Signature: (JJ)[[Ljava/lang/String;
  */
-JNIEXPORT jobjectArray JNICALL Java_ai_onnxruntime_OrtEpDevice_getOptions
+JNIEXPORT jobjectArray JNICALL Java_ai_onnxruntime_OrtEpDevice_getEpOptions
   (JNIEnv * jniEnv, jclass jclazz, jlong apiHandle, jlong nativeHandle) {
   (void) jclazz; // Required JNI parameter not needed by functions which don't need to access their host object.
   const OrtApi* api = (const OrtApi*) apiHandle;