Abstracted search cursors in SearchCursor interface

This change should help with separating concerns between each module
in searchfragment/. Now cursors returned from each CursorLoader are
expected to insert their own headers if they want to. This also simplifies
the logic in SearchCursorManager and allows for easier implementation of
new cursors.

Future CLs will include abstracting ViewHolders and CursorLoaders.

Bug: 37209462
Test: existing
PiperOrigin-RevId: 164676135
Change-Id: Ib50090c3990c903cfd78f3a168032edd88f0fe56

1 files changed, 38 insertions, 0 deletions

diff --git a/java/com/android/dialer/searchfragment/common/SearchCursor.java b/java/com/android/dialer/searchfragment/common/SearchCursor.java
new file mode 100644
index 000000000..368ee09d6
--- /dev/null
+++ b/java/com/android/dialer/searchfragment/common/SearchCursor.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.dialer.searchfragment.common;
+
+import android.database.Cursor;
+import android.support.annotation.NonNull;
+
+/** Base cursor interface needed for all cursors used in search. */
+public interface SearchCursor extends Cursor {
+
+  String[] HEADER_PROJECTION = {"header_text"};
+
+  int HEADER_TEXT_POSITION = 0;
+
+  /** Returns true if the current cursor position is a header */
+  boolean isHeader();
+
+  /**
+   * Notifies the cursor that the query has updated.
+   *
+   * @return true if the data set has changed.
+   */
+  boolean updateQuery(@NonNull String query);
+}