76 lines
2.6 KiB
Java
76 lines
2.6 KiB
Java
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package android.database;
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import android.database.CrossProcessCursor;
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import android.database.Cursor;
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import android.database.CursorWindow;
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import android.database.CursorWrapper;
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/**
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* Cursor wrapper that implements {@link CrossProcessCursor}.
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* <p>
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* If the wrapped cursor implements {@link CrossProcessCursor}, then the wrapper
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* delegates {@link #fillWindow}, {@link #getWindow()} and {@link #onMove} to it.
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* Otherwise, the wrapper provides default implementations of these methods that
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* traverse the contents of the cursor similar to {@link AbstractCursor#fillWindow}.
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* </p><p>
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* This wrapper can be used to adapt an ordinary {@link Cursor} into a
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* {@link CrossProcessCursor}.
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* </p>
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*/
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public class CrossProcessCursorWrapper extends CursorWrapper implements CrossProcessCursor {
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/**
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* Creates a cross process cursor wrapper.
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* @param cursor The underlying cursor to wrap.
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*/
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public CrossProcessCursorWrapper(Cursor cursor) {
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super(cursor);
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}
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@Override
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public void fillWindow(int position, CursorWindow window) {
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if (mCursor instanceof CrossProcessCursor) {
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final CrossProcessCursor crossProcessCursor = (CrossProcessCursor)mCursor;
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crossProcessCursor.fillWindow(position, window);
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return;
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}
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DatabaseUtils.cursorFillWindow(mCursor, position, window);
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}
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@Override
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public CursorWindow getWindow() {
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if (mCursor instanceof CrossProcessCursor) {
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final CrossProcessCursor crossProcessCursor = (CrossProcessCursor)mCursor;
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return crossProcessCursor.getWindow();
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}
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return null;
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}
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@Override
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public boolean onMove(int oldPosition, int newPosition) {
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if (mCursor instanceof CrossProcessCursor) {
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final CrossProcessCursor crossProcessCursor = (CrossProcessCursor)mCursor;
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return crossProcessCursor.onMove(oldPosition, newPosition);
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}
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return true;
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}
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}
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