Iteration on findDocumentPath() API.

Rename findPath() to findDocumentPath() per comment in ag/1588156.

Bug: 30948740
Change-Id: I84ef4d9c0ed1f854e0e33f3552a1805b944c2791
diff --git a/core/java/android/provider/DocumentsContract.java b/core/java/android/provider/DocumentsContract.java
index 20c7073..59a8fda 100644
--- a/core/java/android/provider/DocumentsContract.java
+++ b/core/java/android/provider/DocumentsContract.java
@@ -636,7 +636,7 @@
     /** {@hide} */
     public static final String METHOD_EJECT_ROOT = "android:ejectRoot";
     /** {@hide} */
-    public static final String METHOD_FIND_PATH = "android:findPath";
+    public static final String METHOD_FIND_DOCUMENT_PATH = "android:findDocumentPath";
 
     /** {@hide} */
     public static final String EXTRA_PARENT_URI = "parentUri";
@@ -1304,22 +1304,22 @@
      * from the top of the tree or the root document to the requested document,
      * both inclusive.
      *
-     * Document id should be unique across roots.
+     * Document ID should be unique across roots.
      *
      * @param treeUri treeUri of the document which path is requested.
      * @return a list of documents ID starting from the top of the tree to the
      *      requested document, or {@code null} if failed.
-     * @see DocumentsProvider#findPath(String, String)
+     * @see DocumentsProvider#findDocumentPath(String, String)
      *
      * {@hide}
      */
-    public static List<String> findPath(ContentResolver resolver, Uri treeUri) {
+    public static List<String> findDocumentPath(ContentResolver resolver, Uri treeUri) {
         checkArgument(isTreeUri(treeUri), treeUri + " is not a tree uri.");
 
         final ContentProviderClient client = resolver.acquireUnstableContentProviderClient(
                 treeUri.getAuthority());
         try {
-            return findPath(client, treeUri).getPath();
+            return findDocumentPath(client, treeUri).getPath();
         } catch (Exception e) {
             Log.w(TAG, "Failed to find path", e);
             return null;
@@ -1339,15 +1339,15 @@
      * @param uri uri of the document which path is requested. It can be either a
      *          plain document uri or a tree uri.
      * @return the path of the document.
-     * @see DocumentsProvider#findPath(String, String)
+     * @see DocumentsProvider#findDocumentPath(String, String)
      *
      * {@hide}
      */
-    public static Path findPath(ContentProviderClient client, Uri uri) throws RemoteException {
+    public static Path findDocumentPath(ContentProviderClient client, Uri uri) throws RemoteException {
         final Bundle in = new Bundle();
         in.putParcelable(DocumentsContract.EXTRA_URI, uri);
 
-        final Bundle out = client.call(METHOD_FIND_PATH, null, in);
+        final Bundle out = client.call(METHOD_FIND_DOCUMENT_PATH, null, in);
 
         return out.getParcelable(DocumentsContract.EXTRA_RESULT);
     }
diff --git a/core/java/android/provider/DocumentsProvider.java b/core/java/android/provider/DocumentsProvider.java
index 4256484..1df4dbd 100644
--- a/core/java/android/provider/DocumentsProvider.java
+++ b/core/java/android/provider/DocumentsProvider.java
@@ -20,7 +20,7 @@
 import static android.provider.DocumentsContract.METHOD_CREATE_DOCUMENT;
 import static android.provider.DocumentsContract.METHOD_DELETE_DOCUMENT;
 import static android.provider.DocumentsContract.METHOD_EJECT_ROOT;
-import static android.provider.DocumentsContract.METHOD_FIND_PATH;
+import static android.provider.DocumentsContract.METHOD_FIND_DOCUMENT_PATH;
 import static android.provider.DocumentsContract.METHOD_IS_CHILD_DOCUMENT;
 import static android.provider.DocumentsContract.METHOD_MOVE_DOCUMENT;
 import static android.provider.DocumentsContract.METHOD_REMOVE_DOCUMENT;
@@ -350,17 +350,17 @@
      * document.
      *
      * @param childDocumentId the document which path is requested.
-     * @param parentDocumentId the document with which path starts if not null, or
-     *     null to indicate path to root is requested.
+     * @param parentDocumentId the document from which the path starts if not null,
+     *     or null to indicate a path from the root is requested.
      * @return the path of the requested document. If parentDocumentId is null
      *     returned root ID must not be null. If parentDocumentId is not null
      *     returned root ID must be null.
      *
      * @hide
      */
-    public Path findPath(String childDocumentId, @Nullable String parentDocumentId)
+    public Path findDocumentPath(String childDocumentId, @Nullable String parentDocumentId)
             throws FileNotFoundException {
-        throw new UnsupportedOperationException("findPath not supported.");
+        throw new UnsupportedOperationException("findDocumentPath not supported.");
     }
 
     /**
@@ -914,7 +914,7 @@
 
             // It's responsibility of the provider to revoke any grants, as the document may be
             // still attached to another parents.
-        } else if (METHOD_FIND_PATH.equals(method)) {
+        } else if (METHOD_FIND_DOCUMENT_PATH.equals(method)) {
             final boolean isTreeUri = isTreeUri(documentUri);
 
             if (isTreeUri) {
@@ -927,7 +927,7 @@
                     ? DocumentsContract.getTreeDocumentId(documentUri)
                     : null;
 
-            Path path = findPath(documentId, parentDocumentId);
+            Path path = findDocumentPath(documentId, parentDocumentId);
 
             // Ensure provider doesn't leak information to unprivileged callers.
             if (isTreeUri) {
diff --git a/core/tests/coretests/src/android/provider/DocumentsProviderTest.java b/core/tests/coretests/src/android/provider/DocumentsProviderTest.java
index 71546e4..d1c68a9 100644
--- a/core/tests/coretests/src/android/provider/DocumentsProviderTest.java
+++ b/core/tests/coretests/src/android/provider/DocumentsProviderTest.java
@@ -60,7 +60,7 @@
                 DocumentsContract.buildDocumentUri(TestDocumentsProvider.AUTHORITY, DOCUMENT_ID);
         try (ContentProviderClient client =
                      mResolver.acquireUnstableContentProviderClient(docUri)) {
-            final Path actual = DocumentsContract.findPath(client, docUri);
+            final Path actual = DocumentsContract.findDocumentPath(client, docUri);
             assertEquals(expected, actual);
         }
     }
@@ -73,7 +73,7 @@
 
         final Uri docUri = buildTreeDocumentUri(
                 TestDocumentsProvider.AUTHORITY, PARENT_DOCUMENT_ID, DOCUMENT_ID);
-        final List<String> actual = DocumentsContract.findPath(mResolver, docUri);
+        final List<String> actual = DocumentsContract.findDocumentPath(mResolver, docUri);
 
         assertEquals(expected.getPath(), actual);
     }
@@ -83,7 +83,7 @@
 
         final Uri docUri = buildTreeDocumentUri(
                 TestDocumentsProvider.AUTHORITY, PARENT_DOCUMENT_ID, DOCUMENT_ID);
-        assertNull(DocumentsContract.findPath(mResolver, docUri));
+        assertNull(DocumentsContract.findDocumentPath(mResolver, docUri));
     }
 
     public void testFindPath_treeUri_erasesNonNullRootId() throws Exception {
@@ -95,7 +95,7 @@
                 TestDocumentsProvider.AUTHORITY, PARENT_DOCUMENT_ID, DOCUMENT_ID);
         try (ContentProviderClient client =
                      mResolver.acquireUnstableContentProviderClient(docUri)) {
-            Path path = DocumentsContract.findPath(client, docUri);
+            Path path = DocumentsContract.findDocumentPath(client, docUri);
             assertNull(path.getRootId());
         }
     }
diff --git a/core/tests/coretests/src/android/provider/TestDocumentsProvider.java b/core/tests/coretests/src/android/provider/TestDocumentsProvider.java
index 8dcf566..d61049d 100644
--- a/core/tests/coretests/src/android/provider/TestDocumentsProvider.java
+++ b/core/tests/coretests/src/android/provider/TestDocumentsProvider.java
@@ -85,7 +85,7 @@
     }
 
     @Override
-    public Path findPath(String documentId, @Nullable String parentDocumentId) {
+    public Path findDocumentPath(String documentId, @Nullable String parentDocumentId) {
         lastDocumentId = documentId;
         lastParentDocumentId = parentDocumentId;
 
diff --git a/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java b/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
index 4e6f3d0..9af20d0 100644
--- a/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
+++ b/packages/ExternalStorageProvider/src/com/android/externalstorage/ExternalStorageProvider.java
@@ -445,7 +445,7 @@
     }
 
     @Override
-    public Path findPath(String childDocId, @Nullable String parentDocId)
+    public Path findDocumentPath(String childDocId, @Nullable String parentDocId)
             throws FileNotFoundException {
         LinkedList<String> path = new LinkedList<>();