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Diffstat (limited to 'core/java/android/database/AbstractWindowedCursor.java')
-rw-r--r-- | core/java/android/database/AbstractWindowedCursor.java | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/core/java/android/database/AbstractWindowedCursor.java b/core/java/android/database/AbstractWindowedCursor.java new file mode 100644 index 0000000..1ec4312 --- /dev/null +++ b/core/java/android/database/AbstractWindowedCursor.java @@ -0,0 +1,204 @@ +/* + * 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); + } + + @Override + protected void checkPosition() + { + super.checkPosition(); + + if (mWindow == null) { + throw new StaleDataException("This cursor has changed, you must call requery()"); + } + } + + @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; +} |