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Diffstat (limited to 'core/java/android/widget/CursorFilter.java')
-rw-r--r-- | core/java/android/widget/CursorFilter.java | 70 |
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 @@ -0,0 +1,70 @@ +/* + * 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); + } + } +} |