Add missing requireHandles

Signed-off-by: Ryan Nett <[email protected]>

Author: rnett

tensorflow-core/tensorflow-core-api/src/main/java/org/tensorflow/GraphOperation.java

@@ -194,6 +194,7 @@ public String device() {
 
   /** Get the number of inputs to the op, not including control inputs. */
   public int numInputs() {
+    requireHandle(unsafeNativeHandle);
     return TF_OperationNumInputs(getUnsafeNativeHandle());
   }
 
@@ -244,6 +245,7 @@ public Output<?>[] inputList(int idx, int length) {
 
   /** Get the op's inputs, not including control inputs. */
   public List<Operand<?>> inputs() {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       int numInputs = numInputs();
       TF_Output handles = new TF_Output(numInputs);
@@ -269,6 +271,7 @@ public List<Operand<?>> inputs() {
    * @param index the output to look for usages of
    */
   public int numConsumers(int index) {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       TF_Output output = new TF_Output().oper(getUnsafeNativeHandle()).index(index);
       return TF_OperationOutputNumConsumers(output);
@@ -282,6 +285,7 @@ public int numConsumers(int index) {
    * @param index the output to look for usages of
    */
   public Set<GraphOperation> consumers(int index) {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       TF_Output output = new TF_Output().oper(getUnsafeNativeHandle()).index(index);
       int numConsumers = numConsumers(index);
@@ -305,6 +309,7 @@ public Set<GraphOperation> consumers(int index) {
    * dependencies.
    */
   public int numConsumers() {
+    requireHandle(unsafeNativeHandle);
     int all = 0;
     for (int i = 0; i < numOutputs(); i++) {
       all += numConsumers(i);
@@ -316,6 +321,7 @@ public int numConsumers() {
    * Get the ops that use any of this op's outputs as an input, not including control dependencies.
    */
   public Set<GraphOperation> consumers() {
+    requireHandle(unsafeNativeHandle);
     Set<GraphOperation> all = new LinkedHashSet<>();
     for (int i = 0; i < numOutputs(); i++) {
       all.addAll(consumers(i));
@@ -325,13 +331,15 @@ public Set<GraphOperation> consumers() {
 
   /** Get the number of control inputs for this op. */
   public int numControlInputs() {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       return TF_OperationNumControlInputs(getUnsafeNativeHandle());
     }
   }
 
   /** Get the control inputs of this op. */
   public Set<GraphOperation> controlInputs() {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       int numInputs = numControlInputs();
       PointerPointer<TF_Operation> handles = new PointerPointer<>(numInputs);
@@ -350,13 +358,15 @@ public Set<GraphOperation> controlInputs() {
 
   /** Get the number of ops with this op as a control dependency. */
   public int numControlConsumers() {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       return TF_OperationNumControlOutputs(getUnsafeNativeHandle());
     }
   }
 
   /** Get the ops with this op as a control dependency. */
   public Set<GraphOperation> controlConsumers() {
+    requireHandle(unsafeNativeHandle);
     try (PointerScope scope = new PointerScope()) {
       int numConsumers = numControlConsumers();
       PointerPointer<TF_Operation> handles = new PointerPointer<>(numConsumers);