Push #getHeight to the hashed entry:

Push #getHeight to the hashed entry as the element entries
are always at height 0 and their height is neither requested
nor included in the proof originally.

Author: dmitry-timofeev

exonum-java-binding/common/src/main/java/com/exonum/binding/common/proofs/list/ListProofElementEntry.java

@@ -24,12 +24,6 @@
 @AutoValue
 abstract class ListProofElementEntry implements ListProofEntry {
 
-  @Override
-  public int getHeight() {
-    // Elements are always at height 0
-    return 0;
-  }
-
   /**
    * Returns a value of the element stored at this index in the list.
    */

exonum-java-binding/common/src/main/java/com/exonum/binding/common/proofs/list/ListProofEntry.java

@@ -38,13 +38,6 @@ interface ListProofEntry {
    */
   long getIndex();
 
-  /**
-   * Returns the height of the proof tree node corresponding to this entry.
-   * The height of leaf nodes is equal to 0; the height of the root, or top node:
-   * <em>ceil(log2(N))</em>.
-   */
-  int getHeight();
-
   static void checkIndex(long index) {
     checkArgument(0 <= index && index <= MAX_INDEX,
         "Entry index (%s) is out of range [0; 2^56]", index);

exonum-java-binding/common/src/main/java/com/exonum/binding/common/proofs/list/ListProofHashedEntry.java

@@ -24,7 +24,13 @@
  */
 @AutoValue
 abstract class ListProofHashedEntry implements ListProofEntry {
-  // todo: do we need the interface (are we going to operate on the entries using the interface?)
+
+  /**
+   * Returns the height of the proof tree node corresponding to this entry.
+   * The height of leaf nodes is equal to 0; the height of the root, or top node:
+   * <em>ceil(log2(N))</em>.
+   */
+  abstract int getHeight();
 
   /**
    * Returns the hash of the sub-tree this entry represents.