auto import from //depot/cupcake/@135843

1 files changed, 70 insertions, 0 deletions

diff --git a/core/java/android/widget/CursorFilter.java b/core/java/android/widget/CursorFilter.java
new file mode 100644
index 0000000..dbded69
--- /dev/null
+++ b/core/java/android/widget/CursorFilter.java
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+/*
+ * Copyright (C) 2007 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 android.widget;
+
+import android.database.Cursor;
+
+/**
+ * <p>The CursorFilter delegates most of the work to the CursorAdapter.
+ * Subclasses should override these delegate methods to run the queries
+ * and convert the results into String that can be used by auto-completion
+ * widgets.</p>
+ */
+class CursorFilter extends Filter {
+    
+    CursorFilterClient mClient;
+    
+    interface CursorFilterClient {
+        CharSequence convertToString(Cursor cursor);
+        Cursor runQueryOnBackgroundThread(CharSequence constraint);
+        Cursor getCursor();
+        void changeCursor(Cursor cursor);
+    }
+
+    CursorFilter(CursorFilterClient client) {
+        mClient = client;
+    }
+    
+    @Override
+    public CharSequence convertResultToString(Object resultValue) {
+        return mClient.convertToString((Cursor) resultValue);
+    }
+
+    @Override
+    protected FilterResults performFiltering(CharSequence constraint) {
+        Cursor cursor = mClient.runQueryOnBackgroundThread(constraint);
+
+        FilterResults results = new FilterResults();
+        if (cursor != null) {
+            results.count = cursor.getCount();
+            results.values = cursor;
+        } else {
+            results.count = 0;
+            results.values = null;
+        }
+        return results;
+    }
+
+    @Override
+    protected void publishResults(CharSequence constraint, FilterResults results) {
+        Cursor oldCursor = mClient.getCursor();
+        
+        if (results.values != null && results.values != oldCursor) {
+            mClient.changeCursor((Cursor) results.values);
+        }
+    }
+}