core/java/android/database/Cursor.java - platform/frameworks/base - Git at Google

 /*
  * 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;

 import android.content.ContentResolver;
 import android.net.Uri;
 import android.os.Bundle;

 import java.util.Map;

 /**
  * This interface provides random read-write access to the result set returned
  * by a database query.
  */
 public interface Cursor {
     /**
      * Returns the numbers of rows in the cursor.
      *
      * @return the number of rows in the cursor.
      */
     int getCount();

     /**
      * Returns the current position of the cursor in the row set.
      * The value is zero-based. When the row set is first returned the cursor
      * will be at positon -1, which is before the first row. After the
      * last row is returned another call to next() will leave the cursor past
      * the last entry, at a position of count().
      *
      * @return the current cursor position.
      */
     int getPosition();

     /**
      * Move the cursor by a relative amount, forward or backward, from the
      * current position. Positive offsets move forwards, negative offsets move
      * backwards. If the final position is outside of the bounds of the result
      * set then the resultant position will be pinned to -1 or count() depending
      * on whether the value is off the front or end of the set, respectively.
      *
      * <p>This method will return true if the requested destination was
      * reachable, otherwise, it returns false. For example, if the cursor is at
      * currently on the second entry in the result set and move(-5) is called,
      * the position will be pinned at -1, and false will be returned.
      *
      * @param offset the offset to be applied from the current position.
      * @return whether the requested move fully succeeded.
      */
     boolean move(int offset);

     /**
      * Move the cursor to an absolute position. The valid
      * range of values is -1 &lt;= position &lt;= count.
      *
      * <p>This method will return true if the request destination was reachable,
      * otherwise, it returns false.
      *
      * @param position the zero-based position to move to.
      * @return whether the requested move fully succeeded.
      */
     boolean moveToPosition(int position);

     /**
      * Move the cursor to the first row.
      *
      * <p>This method will return false if the cursor is empty.
      *
      * @return whether the move succeeded.
      */
     boolean moveToFirst();

     /**
      * Move the cursor to the last row.
      *
      * <p>This method will return false if the cursor is empty.
      *
      * @return whether the move succeeded.
      */
     boolean moveToLast();

     /**
      * Move the cursor to the next row.
      *
      * <p>This method will return false if the cursor is already past the
      * last entry in the result set.
      *
      * @return whether the move succeeded.
      */
     boolean moveToNext();

     /**
      * Move the cursor to the previous row.
      *
      * <p>This method will return false if the cursor is already before the
      * first entry in the result set.
      *
      * @return whether the move succeeded.
      */
     boolean moveToPrevious();

     /**
      * Returns whether the cursor is pointing to the first row.
      *
      * @return whether the cursor is pointing at the first entry.
      */
     boolean isFirst();

     /**
      * Returns whether the cursor is pointing to the last row.
      *
      * @return whether the cursor is pointing at the last entry.
      */
     boolean isLast();

     /**
      * Returns whether the cursor is pointing to the position before the first
      * row.
      *
      * @return whether the cursor is before the first result.
      */
     boolean isBeforeFirst();

     /**
      * Returns whether the cursor is pointing to the position after the last
      * row.
      *
      * @return whether the cursor is after the last result.
      */
     boolean isAfterLast();

     /**
      * Removes the row at the current cursor position from the underlying data
      * store. After this method returns the cursor will be pointing to the row
      * after the row that is deleted. This has the side effect of decrementing
      * the result of count() by one.
      * <p>
      * The query must have the row ID column in its selection, otherwise this
      * call will fail.
      *
      * @hide
      * @return whether the record was successfully deleted.
      * @deprecated use {@link ContentResolver#delete(Uri, String, String[])}
      */
     @Deprecated
     boolean deleteRow();

     /**
      * Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
      * If you expect the column to exist use {@link #getColumnIndexOrThrow(String)} instead, which
      * will make the error more clear.
      *
      * @param columnName the name of the target column.
      * @return the zero-based column index for the given column name, or -1 if
      * the column name does not exist.
      * @see #getColumnIndexOrThrow(String)
      */
     int getColumnIndex(String columnName);

     /**
      * Returns the zero-based index for the given column name, or throws
      * {@link IllegalArgumentException} if the column doesn't exist. If you're not sure if
      * a column will exist or not use {@link #getColumnIndex(String)} and check for -1, which
      * is more efficient than catching the exceptions.
      *
      * @param columnName the name of the target column.
      * @return the zero-based column index for the given column name
      * @see #getColumnIndex(String)
      * @throws IllegalArgumentException if the column does not exist
      */
     int getColumnIndexOrThrow(String columnName) throws IllegalArgumentException;

     /**
      * Returns the column name at the given zero-based column index.
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the column name for the given column index.
      */
     String getColumnName(int columnIndex);

     /**
      * Returns a string array holding the names of all of the columns in the
      * result set in the order in which they were listed in the result.
      *
      * @return the names of the columns returned in this query.
      */
     String[] getColumnNames();

     /**
      * Return total number of columns
      * @return number of columns
      */
     int getColumnCount();

     /**
      * Returns the value of the requested column as a byte array.
      *
      * <p>If the native content of that column is not blob exception may throw
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a byte array.
      */
     byte[] getBlob(int columnIndex);

     /**
      * Returns the value of the requested column as a String.
      *
      * <p>If the native content of that column is not text the result will be
      * the result of passing the column value to String.valueOf(x).
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a String.
      */
     String getString(int columnIndex);

     /**
      * Retrieves the requested column text and stores it in the buffer provided.
      * If the buffer size is not sufficient, a new char buffer will be allocated
      * and assigned to CharArrayBuffer.data
      * @param columnIndex the zero-based index of the target column.
      *        if the target column is null, return buffer
      * @param buffer the buffer to copy the text into.
      */
     void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer);

     /**
      * Returns the value of the requested column as a short.
      *
      * <p>If the native content of that column is not numeric the result will be
      * the result of passing the column value to Short.valueOf(x).
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a short.
      */
     short getShort(int columnIndex);

     /**
      * Returns the value of the requested column as an int.
      *
      * <p>If the native content of that column is not numeric the result will be
      * the result of passing the column value to Integer.valueOf(x).
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as an int.
      */
     int getInt(int columnIndex);

     /**
      * Returns the value of the requested column as a long.
      *
      * <p>If the native content of that column is not numeric the result will be
      * the result of passing the column value to Long.valueOf(x).
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a long.
      */
     long getLong(int columnIndex);

     /**
      * Returns the value of the requested column as a float.
      *
      * <p>If the native content of that column is not numeric the result will be
      * the result of passing the column value to Float.valueOf(x).
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a float.
      */
     float getFloat(int columnIndex);

     /**
      * Returns the value of the requested column as a double.
      *
      * <p>If the native content of that column is not numeric the result will be
      * the result of passing the column value to Double.valueOf(x).
      *
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a double.
      */
     double getDouble(int columnIndex);

     /**
      * Returns <code>true</code> if the value in the indicated column is null.
      *
      * @param columnIndex the zero-based index of the target column.
      * @return whether the column value is null.
      */
     boolean isNull(int columnIndex);

     /**
      * Returns <code>true</code> if the cursor supports updates.
      *
      * @return whether the cursor supports updates.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean supportsUpdates();

     /**
      * Returns <code>true</code> if there are pending updates that have not yet been committed.
      *
      * @return <code>true</code> if there are pending updates that have not yet been committed.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean hasUpdates();

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateBlob(int columnIndex, byte[] value);

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateString(int columnIndex, String value);

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateShort(int columnIndex, short value);

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateInt(int columnIndex, int value);

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateLong(int columnIndex, long value);

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateFloat(int columnIndex, float value);

     /**
      * Updates the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @param value the new value.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateDouble(int columnIndex, double value);

     /**
      * Removes the value for the given column in the row the cursor is
      * currently pointing at. Updates are not committed to the backing store
      * until {@link #commitUpdates()} is called.
      *
      * @param columnIndex the zero-based index of the target column.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean updateToNull(int columnIndex);

     /**
      * Atomically commits all updates to the backing store. After completion,
      * this method leaves the data in an inconsistent state and you should call
      * {@link #requery} before reading data from the cursor again.
      *
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean commitUpdates();

     /**
      * Atomically commits all updates to the backing store, as well as the
      * updates included in values. After completion,
      * this method leaves the data in an inconsistent state and you should call
      * {@link #requery} before reading data from the cursor again.
      *
      * @param values A map from row IDs to Maps associating column names with
      *               updated values. A null value indicates the field should be
                      removed.
      * @return whether the operation succeeded.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     boolean commitUpdates(Map<? extends Long,
             ? extends Map<String,Object>> values);

     /**
      * Reverts all updates made to the cursor since the last call to
      * commitUpdates.
      * @hide
      * @deprecated use the {@link ContentResolver} update methods instead of the Cursor
      * update methods
      */
     @Deprecated
     void abortUpdates();

     /**
      * Deactivates the Cursor, making all calls on it fail until {@link #requery} is called.
      * Inactive Cursors use fewer resources than active Cursors.
      * Calling {@link #requery} will make the cursor active again.
      */
     void deactivate();

     /**
      * Performs the query that created the cursor again, refreshing its
      * contents. This may be done at any time, including after a call to {@link
      * #deactivate}.
      *
      * @return true if the requery succeeded, false if not, in which case the
      *         cursor becomes invalid.
      */
     boolean requery();

     /**
      * Closes the Cursor, releasing all of its resources and making it completely invalid.
      * Unlike {@link #deactivate()} a call to {@link #requery()} will not make the Cursor valid
      * again.
      */
     void close();

     /**
      * return true if the cursor is closed
      * @return true if the cursor is closed.
      */
     boolean isClosed();

     /**
      * Register an observer that is called when changes happen to the content backing this cursor.
      * Typically the data set won't change until {@link #requery()} is called.
      *
      * @param observer the object that gets notified when the content backing the cursor changes.
      * @see #unregisterContentObserver(ContentObserver)
      */
     void registerContentObserver(ContentObserver observer);

     /**
      * Unregister an observer that has previously been registered with this
      * cursor via {@link #registerContentObserver}.
      *
      * @param observer the object to unregister.
      * @see #registerContentObserver(ContentObserver)
      */
     void unregisterContentObserver(ContentObserver observer);

     /**
      * Register an observer that is called when changes happen to the contents
      * of the this cursors data set, for example, when the data set is changed via
      * {@link #requery()}, {@link #deactivate()}, or {@link #close()}.
      *
      * @param observer the object that gets notified when the cursors data set changes.
      * @see #unregisterDataSetObserver(DataSetObserver)
      */
     void registerDataSetObserver(DataSetObserver observer);

     /**
      * Unregister an observer that has previously been registered with this
      * cursor via {@link #registerContentObserver}.
      *
      * @param observer the object to unregister.
      * @see #registerDataSetObserver(DataSetObserver)
      */
     void unregisterDataSetObserver(DataSetObserver observer);

     /**
      * Register to watch a content URI for changes. This can be the URI of a specific data row (for
      * example, "content://my_provider_type/23"), or a a generic URI for a content type.
      *
      * @param cr The content resolver from the caller's context. The listener attached to
      * this resolver will be notified.
      * @param uri The content URI to watch.
      */
     void setNotificationUri(ContentResolver cr, Uri uri);

     /**
      * onMove() will only be called across processes if this method returns true.
      * @return whether all cursor movement should result in a call to onMove().
      */
     boolean getWantsAllOnMoveCalls();

     /**
      * Returns a bundle of extra values. This is an optional way for cursors to provide out-of-band
      * metadata to their users. One use of this is for reporting on the progress of network requests
      * that are required to fetch data for the cursor.
      *
      * <p>These values may only change when requery is called.
      * @return cursor-defined values, or Bundle.EMTPY if there are no values. Never null.
      */
     Bundle getExtras();

     /**
      * This is an out-of-band way for the the user of a cursor to communicate with the cursor. The
      * structure of each bundle is entirely defined by the cursor.
      *
      * <p>One use of this is to tell a cursor that it should retry its network request after it
      * reported an error.
      * @param extras extra values, or Bundle.EMTPY. Never null.
      * @return extra values, or Bundle.EMTPY. Never null.
      */
     Bundle respond(Bundle extras);
 }
	/*
	* 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;

	import android.content.ContentResolver;
	import android.net.Uri;
	import android.os.Bundle;

	import java.util.Map;

	/**
	* This interface provides random read-write access to the result set returned
	* by a database query.
	*/
	public interface Cursor {
	/**
	* Returns the numbers of rows in the cursor.
	*
	* @return the number of rows in the cursor.
	*/
	int getCount();

	/**
	* Returns the current position of the cursor in the row set.
	* The value is zero-based. When the row set is first returned the cursor
	* will be at positon -1, which is before the first row. After the
	* last row is returned another call to next() will leave the cursor past
	* the last entry, at a position of count().
	*
	* @return the current cursor position.
	*/
	int getPosition();

	/**
	* Move the cursor by a relative amount, forward or backward, from the
	* current position. Positive offsets move forwards, negative offsets move
	* backwards. If the final position is outside of the bounds of the result
	* set then the resultant position will be pinned to -1 or count() depending
	* on whether the value is off the front or end of the set, respectively.
	*
	* <p>This method will return true if the requested destination was
	* reachable, otherwise, it returns false. For example, if the cursor is at
	* currently on the second entry in the result set and move(-5) is called,
	* the position will be pinned at -1, and false will be returned.
	*
	* @param offset the offset to be applied from the current position.
	* @return whether the requested move fully succeeded.
	*/
	boolean move(int offset);

	/**
	* Move the cursor to an absolute position. The valid
	* range of values is -1 <= position <= count.
	*
	* <p>This method will return true if the request destination was reachable,
	* otherwise, it returns false.
	*
	* @param position the zero-based position to move to.
	* @return whether the requested move fully succeeded.
	*/
	boolean moveToPosition(int position);

	/**
	* Move the cursor to the first row.
	*
	* <p>This method will return false if the cursor is empty.
	*
	* @return whether the move succeeded.
	*/
	boolean moveToFirst();

	/**
	* Move the cursor to the last row.
	*
	* <p>This method will return false if the cursor is empty.
	*
	* @return whether the move succeeded.
	*/
	boolean moveToLast();

	/**
	* Move the cursor to the next row.
	*
	* <p>This method will return false if the cursor is already past the
	* last entry in the result set.
	*
	* @return whether the move succeeded.
	*/
	boolean moveToNext();

	/**
	* Move the cursor to the previous row.
	*
	* <p>This method will return false if the cursor is already before the
	* first entry in the result set.
	*
	* @return whether the move succeeded.
	*/
	boolean moveToPrevious();

	/**
	* Returns whether the cursor is pointing to the first row.
	*
	* @return whether the cursor is pointing at the first entry.
	*/
	boolean isFirst();

	/**
	* Returns whether the cursor is pointing to the last row.
	*
	* @return whether the cursor is pointing at the last entry.
	*/
	boolean isLast();

	/**
	* Returns whether the cursor is pointing to the position before the first
	* row.
	*
	* @return whether the cursor is before the first result.
	*/
	boolean isBeforeFirst();

	/**
	* Returns whether the cursor is pointing to the position after the last
	* row.
	*
	* @return whether the cursor is after the last result.
	*/
	boolean isAfterLast();

	/**
	* Removes the row at the current cursor position from the underlying data
	* store. After this method returns the cursor will be pointing to the row
	* after the row that is deleted. This has the side effect of decrementing
	* the result of count() by one.
	* <p>
	* The query must have the row ID column in its selection, otherwise this
	* call will fail.
	*
	* @hide
	* @return whether the record was successfully deleted.
	* @deprecated use {@link ContentResolver#delete(Uri, String, String[])}
	*/
	@Deprecated
	boolean deleteRow();

	/**
	* Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
	* If you expect the column to exist use {@link #getColumnIndexOrThrow(String)} instead, which
	* will make the error more clear.
	*
	* @param columnName the name of the target column.
	* @return the zero-based column index for the given column name, or -1 if
	* the column name does not exist.
	* @see #getColumnIndexOrThrow(String)
	*/
	int getColumnIndex(String columnName);

	/**
	* Returns the zero-based index for the given column name, or throws
	* {@link IllegalArgumentException} if the column doesn't exist. If you're not sure if
	* a column will exist or not use {@link #getColumnIndex(String)} and check for -1, which
	* is more efficient than catching the exceptions.
	*
	* @param columnName the name of the target column.
	* @return the zero-based column index for the given column name
	* @see #getColumnIndex(String)
	* @throws IllegalArgumentException if the column does not exist
	*/
	int getColumnIndexOrThrow(String columnName) throws IllegalArgumentException;

	/**
	* Returns the column name at the given zero-based column index.
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the column name for the given column index.
	*/
	String getColumnName(int columnIndex);

	/**
	* Returns a string array holding the names of all of the columns in the
	* result set in the order in which they were listed in the result.
	*
	* @return the names of the columns returned in this query.
	*/
	String[] getColumnNames();

	/**
	* Return total number of columns
	* @return number of columns
	*/
	int getColumnCount();

	/**
	* Returns the value of the requested column as a byte array.
	*
	* <p>If the native content of that column is not blob exception may throw
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as a byte array.
	*/
	byte[] getBlob(int columnIndex);

	/**
	* Returns the value of the requested column as a String.
	*
	* <p>If the native content of that column is not text the result will be
	* the result of passing the column value to String.valueOf(x).
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as a String.
	*/
	String getString(int columnIndex);

	/**
	* Retrieves the requested column text and stores it in the buffer provided.
	* If the buffer size is not sufficient, a new char buffer will be allocated
	* and assigned to CharArrayBuffer.data
	* @param columnIndex the zero-based index of the target column.
	* if the target column is null, return buffer
	* @param buffer the buffer to copy the text into.
	*/
	void copyStringToBuffer(int columnIndex, CharArrayBuffer buffer);

	/**
	* Returns the value of the requested column as a short.
	*
	* <p>If the native content of that column is not numeric the result will be
	* the result of passing the column value to Short.valueOf(x).
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as a short.
	*/
	short getShort(int columnIndex);

	/**
	* Returns the value of the requested column as an int.
	*
	* <p>If the native content of that column is not numeric the result will be
	* the result of passing the column value to Integer.valueOf(x).
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as an int.
	*/
	int getInt(int columnIndex);

	/**
	* Returns the value of the requested column as a long.
	*
	* <p>If the native content of that column is not numeric the result will be
	* the result of passing the column value to Long.valueOf(x).
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as a long.
	*/
	long getLong(int columnIndex);

	/**
	* Returns the value of the requested column as a float.
	*
	* <p>If the native content of that column is not numeric the result will be
	* the result of passing the column value to Float.valueOf(x).
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as a float.
	*/
	float getFloat(int columnIndex);

	/**
	* Returns the value of the requested column as a double.
	*
	* <p>If the native content of that column is not numeric the result will be
	* the result of passing the column value to Double.valueOf(x).
	*
	* @param columnIndex the zero-based index of the target column.
	* @return the value of that column as a double.
	*/
	double getDouble(int columnIndex);

	/**
	* Returns <code>true</code> if the value in the indicated column is null.
	*
	* @param columnIndex the zero-based index of the target column.
	* @return whether the column value is null.
	*/
	boolean isNull(int columnIndex);

	/**
	* Returns <code>true</code> if the cursor supports updates.
	*
	* @return whether the cursor supports updates.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean supportsUpdates();

	/**
	* Returns <code>true</code> if there are pending updates that have not yet been committed.
	*
	* @return <code>true</code> if there are pending updates that have not yet been committed.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean hasUpdates();

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateBlob(int columnIndex, byte[] value);

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateString(int columnIndex, String value);

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateShort(int columnIndex, short value);

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateInt(int columnIndex, int value);

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateLong(int columnIndex, long value);

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateFloat(int columnIndex, float value);

	/**
	* Updates the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @param value the new value.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateDouble(int columnIndex, double value);

	/**
	* Removes the value for the given column in the row the cursor is
	* currently pointing at. Updates are not committed to the backing store
	* until {@link #commitUpdates()} is called.
	*
	* @param columnIndex the zero-based index of the target column.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean updateToNull(int columnIndex);

	/**
	* Atomically commits all updates to the backing store. After completion,
	* this method leaves the data in an inconsistent state and you should call
	* {@link #requery} before reading data from the cursor again.
	*
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean commitUpdates();

	/**
	* Atomically commits all updates to the backing store, as well as the
	* updates included in values. After completion,
	* this method leaves the data in an inconsistent state and you should call
	* {@link #requery} before reading data from the cursor again.
	*
	* @param values A map from row IDs to Maps associating column names with
	* updated values. A null value indicates the field should be
	removed.
	* @return whether the operation succeeded.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	boolean commitUpdates(Map<? extends Long,
	? extends Map<String,Object>> values);

	/**
	* Reverts all updates made to the cursor since the last call to
	* commitUpdates.
	* @hide
	* @deprecated use the {@link ContentResolver} update methods instead of the Cursor
	* update methods
	*/
	@Deprecated
	void abortUpdates();

	/**
	* Deactivates the Cursor, making all calls on it fail until {@link #requery} is called.
	* Inactive Cursors use fewer resources than active Cursors.
	* Calling {@link #requery} will make the cursor active again.
	*/
	void deactivate();

	/**
	* Performs the query that created the cursor again, refreshing its
	* contents. This may be done at any time, including after a call to {@link
	* #deactivate}.
	*
	* @return true if the requery succeeded, false if not, in which case the
	* cursor becomes invalid.
	*/
	boolean requery();

	/**
	* Closes the Cursor, releasing all of its resources and making it completely invalid.
	* Unlike {@link #deactivate()} a call to {@link #requery()} will not make the Cursor valid
	* again.
	*/
	void close();

	/**
	* return true if the cursor is closed
	* @return true if the cursor is closed.
	*/
	boolean isClosed();

	/**
	* Register an observer that is called when changes happen to the content backing this cursor.
	* Typically the data set won't change until {@link #requery()} is called.
	*
	* @param observer the object that gets notified when the content backing the cursor changes.
	* @see #unregisterContentObserver(ContentObserver)
	*/
	void registerContentObserver(ContentObserver observer);

	/**
	* Unregister an observer that has previously been registered with this
	* cursor via {@link #registerContentObserver}.
	*
	* @param observer the object to unregister.
	* @see #registerContentObserver(ContentObserver)
	*/
	void unregisterContentObserver(ContentObserver observer);

	/**
	* Register an observer that is called when changes happen to the contents
	* of the this cursors data set, for example, when the data set is changed via
	* {@link #requery()}, {@link #deactivate()}, or {@link #close()}.
	*
	* @param observer the object that gets notified when the cursors data set changes.
	* @see #unregisterDataSetObserver(DataSetObserver)
	*/
	void registerDataSetObserver(DataSetObserver observer);

	/**
	* Unregister an observer that has previously been registered with this
	* cursor via {@link #registerContentObserver}.
	*
	* @param observer the object to unregister.
	* @see #registerDataSetObserver(DataSetObserver)
	*/
	void unregisterDataSetObserver(DataSetObserver observer);

	/**
	* Register to watch a content URI for changes. This can be the URI of a specific data row (for
	* example, "content://my_provider_type/23"), or a a generic URI for a content type.
	*
	* @param cr The content resolver from the caller's context. The listener attached to
	* this resolver will be notified.
	* @param uri The content URI to watch.
	*/
	void setNotificationUri(ContentResolver cr, Uri uri);

	/**
	* onMove() will only be called across processes if this method returns true.
	* @return whether all cursor movement should result in a call to onMove().
	*/
	boolean getWantsAllOnMoveCalls();

	/**
	* Returns a bundle of extra values. This is an optional way for cursors to provide out-of-band
	* metadata to their users. One use of this is for reporting on the progress of network requests
	* that are required to fetch data for the cursor.
	*
	* <p>These values may only change when requery is called.
	* @return cursor-defined values, or Bundle.EMTPY if there are no values. Never null.
	*/
	Bundle getExtras();

	/**
	* This is an out-of-band way for the the user of a cursor to communicate with the cursor. The
	* structure of each bundle is entirely defined by the cursor.
	*
	* <p>One use of this is to tell a cursor that it should retry its network request after it
	* reported an error.
	* @param extras extra values, or Bundle.EMTPY. Never null.
	* @return extra values, or Bundle.EMTPY. Never null.
	*/
	Bundle respond(Bundle extras);
	}