| /* |
| * Copyright (C) 2006 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.database; |
| |
| /** |
| * A base class for Cursors that store their data in {@link CursorWindow}s. |
| */ |
| public abstract class AbstractWindowedCursor extends AbstractCursor |
| { |
| @Override |
| public byte[] getBlob(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| return (byte[])getUpdatedField(columnIndex); |
| } |
| } |
| |
| return mWindow.getBlob(mPos, columnIndex); |
| } |
| |
| @Override |
| public String getString(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| return (String)getUpdatedField(columnIndex); |
| } |
| } |
| |
| return mWindow.getString(mPos, columnIndex); |
| } |
| |
| @Override |
| public void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| super.copyStringToBuffer(columnIndex, buffer); |
| } |
| } |
| |
| mWindow.copyStringToBuffer(mPos, columnIndex, buffer); |
| } |
| |
| @Override |
| public short getShort(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Number value = (Number)getUpdatedField(columnIndex); |
| return value.shortValue(); |
| } |
| } |
| |
| return mWindow.getShort(mPos, columnIndex); |
| } |
| |
| @Override |
| public int getInt(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Number value = (Number)getUpdatedField(columnIndex); |
| return value.intValue(); |
| } |
| } |
| |
| return mWindow.getInt(mPos, columnIndex); |
| } |
| |
| @Override |
| public long getLong(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Number value = (Number)getUpdatedField(columnIndex); |
| return value.longValue(); |
| } |
| } |
| |
| return mWindow.getLong(mPos, columnIndex); |
| } |
| |
| @Override |
| public float getFloat(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Number value = (Number)getUpdatedField(columnIndex); |
| return value.floatValue(); |
| } |
| } |
| |
| return mWindow.getFloat(mPos, columnIndex); |
| } |
| |
| @Override |
| public double getDouble(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Number value = (Number)getUpdatedField(columnIndex); |
| return value.doubleValue(); |
| } |
| } |
| |
| return mWindow.getDouble(mPos, columnIndex); |
| } |
| |
| @Override |
| public boolean isNull(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| return getUpdatedField(columnIndex) == null; |
| } |
| } |
| |
| return mWindow.isNull(mPos, columnIndex); |
| } |
| |
| public boolean isBlob(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Object object = getUpdatedField(columnIndex); |
| return object == null || object instanceof byte[]; |
| } |
| } |
| |
| return mWindow.isBlob(mPos, columnIndex); |
| } |
| |
| public boolean isString(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Object object = getUpdatedField(columnIndex); |
| return object == null || object instanceof String; |
| } |
| } |
| |
| return mWindow.isString(mPos, columnIndex); |
| } |
| |
| public boolean isLong(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Object object = getUpdatedField(columnIndex); |
| return object != null && (object instanceof Integer || object instanceof Long); |
| } |
| } |
| |
| return mWindow.isLong(mPos, columnIndex); |
| } |
| |
| public boolean isFloat(int columnIndex) |
| { |
| checkPosition(); |
| |
| synchronized(mUpdatedRows) { |
| if (isFieldUpdated(columnIndex)) { |
| Object object = getUpdatedField(columnIndex); |
| return object != null && (object instanceof Float || object instanceof Double); |
| } |
| } |
| |
| return mWindow.isFloat(mPos, columnIndex); |
| } |
| |
| @Override |
| protected void checkPosition() |
| { |
| super.checkPosition(); |
| |
| if (mWindow == null) { |
| throw new StaleDataException("Access closed cursor"); |
| } |
| } |
| |
| @Override |
| public CursorWindow getWindow() { |
| return mWindow; |
| } |
| |
| /** |
| * Set a new cursor window to cursor, usually set a remote cursor window |
| * @param window cursor window |
| */ |
| public void setWindow(CursorWindow window) { |
| if (mWindow != null) { |
| mWindow.close(); |
| } |
| mWindow = window; |
| } |
| |
| public boolean hasWindow() { |
| return mWindow != null; |
| } |
| |
| /** |
| * This needs be updated in {@link #onMove} by subclasses, and |
| * needs to be set to NULL when the contents of the cursor change. |
| */ |
| protected CursorWindow mWindow; |
| } |