public class

MatrixCursor

extends AbstractCursor

java.lang.Object
↳	com.tencent.wcdb.AbstractCursor
	↳	com.tencent.wcdb.MatrixCursor

Class Overview

A mutable cursor implementation backed by an array of Objects. Use newRow() to add rows. Automatically expands internal capacity as needed.

Summary

Nested Classes
class	MatrixCursor.RowBuilder	Builds a row, starting from the left-most column and adding one column value at a time.

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Inherited Constants

From interface android.database.Cursor

From interface com.tencent.wcdb.Cursor

Public Constructors
	MatrixCursor(String[] columnNames, int initialCapacity) Constructs a new cursor with the given initial capacity.
	MatrixCursor(String[] columnNames) Constructs a new cursor.

Public Methods
void	addRow(Object[] columnValues) Adds a new row to the end with the given column values.
void	addRow(Iterable<?> columnValues) Adds a new row to the end with the given column values.
void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
byte[]	getBlob(int column) Returns the value of the requested column as a byte array.
String[]	getColumnNames() 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.
int	getCount() Returns the numbers of rows in the cursor.
double	getDouble(int column) Returns the value of the requested column as a double.
float	getFloat(int column) Returns the value of the requested column as a float.
int	getInt(int column) Returns the value of the requested column as an int.
long	getLong(int column) Returns the value of the requested column as a long.
short	getShort(int column) Returns the value of the requested column as a short.
String	getString(int column) Returns the value of the requested column as a String.
int	getType(int column) Returns data type of the given column's value.
boolean	isNull(int column) Returns `true` if the value in the indicated column is null.
MatrixCursor.RowBuilder	newRow() Adds a new row to the end and returns a builder for that row.
void	registerContentObserver(ContentObserver observer) Register an observer that is called when changes happen to the content backing this cursor.
void	registerDataSetObserver(DataSetObserver 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 `requery()`, `deactivate()`, or `close()`.
void	unregisterContentObserver(ContentObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

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Inherited Methods

From class com.tencent.wcdb.AbstractCursor

void	close() Closes the Cursor, releasing all of its resources and making it completely invalid.
void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
void	deactivate() Deactivates the Cursor, making all calls on it fail until `requery()` is called.
void	fillWindow(int position, CursorWindow window) Copies cursor data into the window.
byte[]	getBlob(int column) Returns the value of the requested column as a byte array.
int	getColumnCount() Return total number of columns
int	getColumnIndex(String columnName) Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
int	getColumnIndexOrThrow(String columnName) Returns the zero-based index for the given column name, or throws IllegalArgumentException if the column doesn't exist.
String	getColumnName(int columnIndex) Returns the column name at the given zero-based column index.
abstract String[]	getColumnNames() 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.
abstract int	getCount() Returns the numbers of rows in the cursor.
abstract double	getDouble(int column) Returns the value of the requested column as a double.
Bundle	getExtras() Returns a bundle of extra values.
abstract float	getFloat(int column) Returns the value of the requested column as a float.
abstract int	getInt(int column) Returns the value of the requested column as an int.
abstract long	getLong(int column) Returns the value of the requested column as a long.
Uri	getNotificationUri()
final int	getPosition() Returns the current position of the cursor in the row set.
abstract short	getShort(int column) Returns the value of the requested column as a short.
abstract String	getString(int column) Returns the value of the requested column as a String.
int	getType(int column) Returns data type of the given column's value.
boolean	getWantsAllOnMoveCalls() onMove() will only be called across processes if this method returns true.
CursorWindow	getWindow() If the cursor is backed by a `CursorWindow`, returns a pre-filled window with the contents of the cursor, otherwise null.
final boolean	isAfterLast() Returns whether the cursor is pointing to the position after the last row.
final boolean	isBeforeFirst() Returns whether the cursor is pointing to the position before the first row.
boolean	isClosed() return true if the cursor is closed
final boolean	isFirst() Returns whether the cursor is pointing to the first row.
final boolean	isLast() Returns whether the cursor is pointing to the last row.
abstract boolean	isNull(int column) Returns `true` if the value in the indicated column is null.
final boolean	move(int offset) Move the cursor by a relative amount, forward or backward, from the current position.
final boolean	moveToFirst() Move the cursor to the first row.
final boolean	moveToLast() Move the cursor to the last row.
final boolean	moveToNext() Move the cursor to the next row.
boolean	moveToPosition(int position) Move the cursor to an absolute position.
final boolean	moveToPrevious() Move the cursor to the previous row.
boolean	onMove(int oldPosition, int newPosition) This function is called every time the cursor is successfully scrolled to a new position, giving the subclass a chance to update any state it may have.
void	registerContentObserver(ContentObserver observer) Register an observer that is called when changes happen to the content backing this cursor.
void	registerDataSetObserver(DataSetObserver 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 `requery()`, `deactivate()`, or `close()`.
boolean	requery() Performs the query that created the cursor again, refreshing its contents.
Bundle	respond(Bundle extras) This is an out-of-band way for the the user of a cursor to communicate with the cursor.
void	setNotificationUri(ContentResolver cr, Uri notifyUri) Specifies a content URI to watch for changes.
void	unregisterContentObserver(ContentObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

From class java.lang.Object

From interface android.database.Cursor

abstract void	close()
abstract void	copyStringToBuffer(int arg0, CharArrayBuffer arg1)
abstract void	deactivate()
abstract byte[]	getBlob(int arg0)
abstract int	getColumnCount()
abstract int	getColumnIndex(String arg0)
abstract int	getColumnIndexOrThrow(String arg0)
abstract String	getColumnName(int arg0)
abstract String[]	getColumnNames()
abstract int	getCount()
abstract double	getDouble(int arg0)
abstract Bundle	getExtras()
abstract float	getFloat(int arg0)
abstract int	getInt(int arg0)
abstract long	getLong(int arg0)
abstract Uri	getNotificationUri()
abstract int	getPosition()
abstract short	getShort(int arg0)
abstract String	getString(int arg0)
abstract int	getType(int arg0)
abstract boolean	getWantsAllOnMoveCalls()
abstract boolean	isAfterLast()
abstract boolean	isBeforeFirst()
abstract boolean	isClosed()
abstract boolean	isFirst()
abstract boolean	isLast()
abstract boolean	isNull(int arg0)
abstract boolean	move(int arg0)
abstract boolean	moveToFirst()
abstract boolean	moveToLast()
abstract boolean	moveToNext()
abstract boolean	moveToPosition(int arg0)
abstract boolean	moveToPrevious()
abstract void	registerContentObserver(ContentObserver arg0)
abstract void	registerDataSetObserver(DataSetObserver arg0)
abstract boolean	requery()
abstract Bundle	respond(Bundle arg0)
abstract void	setExtras(Bundle arg0)
abstract void	setNotificationUri(ContentResolver arg0, Uri arg1)
abstract void	unregisterContentObserver(ContentObserver arg0)
abstract void	unregisterDataSetObserver(DataSetObserver arg0)

From interface com.tencent.wcdb.CrossProcessCursor

From interface com.tencent.wcdb.Cursor

abstract void	close() Closes the Cursor, releasing all of its resources and making it completely invalid.
abstract void	copyStringToBuffer(int columnIndex, CharArrayBuffer buffer) Retrieves the requested column text and stores it in the buffer provided.
abstract void	deactivate() This method is deprecated. Since `requery()` is deprecated, so too is this.
abstract byte[]	getBlob(int columnIndex) Returns the value of the requested column as a byte array.
abstract int	getColumnCount() Return total number of columns
abstract int	getColumnIndex(String columnName) Returns the zero-based index for the given column name, or -1 if the column doesn't exist.
abstract int	getColumnIndexOrThrow(String columnName) Returns the zero-based index for the given column name, or throws IllegalArgumentException if the column doesn't exist.
abstract String	getColumnName(int columnIndex) Returns the column name at the given zero-based column index.
abstract String[]	getColumnNames() 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.
abstract int	getCount() Returns the numbers of rows in the cursor.
abstract double	getDouble(int columnIndex) Returns the value of the requested column as a double.
abstract Bundle	getExtras() Returns a bundle of extra values.
abstract float	getFloat(int columnIndex) Returns the value of the requested column as a float.
abstract int	getInt(int columnIndex) Returns the value of the requested column as an int.
abstract long	getLong(int columnIndex) Returns the value of the requested column as a long.
abstract int	getPosition() Returns the current position of the cursor in the row set.
abstract short	getShort(int columnIndex) Returns the value of the requested column as a short.
abstract String	getString(int columnIndex) Returns the value of the requested column as a String.
abstract int	getType(int columnIndex) Returns data type of the given column's value.
abstract boolean	getWantsAllOnMoveCalls() onMove() will only be called across processes if this method returns true.
abstract boolean	isAfterLast() Returns whether the cursor is pointing to the position after the last row.
abstract boolean	isBeforeFirst() Returns whether the cursor is pointing to the position before the first row.
abstract boolean	isClosed() return true if the cursor is closed
abstract boolean	isFirst() Returns whether the cursor is pointing to the first row.
abstract boolean	isLast() Returns whether the cursor is pointing to the last row.
abstract boolean	isNull(int columnIndex) Returns `true` if the value in the indicated column is null.
abstract boolean	move(int offset) Move the cursor by a relative amount, forward or backward, from the current position.
abstract boolean	moveToFirst() Move the cursor to the first row.
abstract boolean	moveToLast() Move the cursor to the last row.
abstract boolean	moveToNext() Move the cursor to the next row.
abstract boolean	moveToPosition(int position) Move the cursor to an absolute position.
abstract boolean	moveToPrevious() Move the cursor to the previous row.
abstract void	registerContentObserver(ContentObserver observer) Register an observer that is called when changes happen to the content backing this cursor.
abstract void	registerDataSetObserver(DataSetObserver 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 `requery()`, `deactivate()`, or `close()`.
abstract boolean	requery() This method is deprecated. Don't use this. Just request a new cursor, so you can do this asynchronously and update your list view once the new cursor comes back.
abstract Bundle	respond(Bundle extras) This is an out-of-band way for the the user of a cursor to communicate with the cursor.
abstract void	setNotificationUri(ContentResolver cr, Uri uri) Register to watch a content URI for changes.
abstract void	unregisterContentObserver(ContentObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.
abstract void	unregisterDataSetObserver(DataSetObserver observer) Unregister an observer that has previously been registered with this cursor via `registerContentObserver(ContentObserver)`.

From interface java.io.Closeable

From interface java.lang.AutoCloseable

Public Constructors

public MatrixCursor (String[] columnNames, int initialCapacity)

Constructs a new cursor with the given initial capacity.

Parameters

columnNames	names of the columns, the ordering of which determines column ordering elsewhere in this cursor
initialCapacity	in rows

public MatrixCursor (String[] columnNames)

Constructs a new cursor.

Parameters

columnNames	names of the columns, the ordering of which determines column ordering elsewhere in this cursor

Public Methods

public void addRow (Object[] columnValues)

Adds a new row to the end with the given column values. Not safe for concurrent use.

Parameters

columnValues	in the same order as the the column names specified at cursor construction time

Throws

IllegalArgumentException	if `columnValues.length != columnNames.length`

public void addRow (Iterable<?> columnValues)

Adds a new row to the end with the given column values. Not safe for concurrent use.

Parameters

columnValues	in the same order as the the column names specified at cursor construction time

Throws

IllegalArgumentException	if `columnValues.size() != columnNames.length`

public void copyStringToBuffer (int columnIndex, CharArrayBuffer buffer)

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

Parameters

columnIndex	the zero-based index of the target column. if the target column is null, return buffer
buffer	the buffer to copy the text into.

public byte[] getBlob (int column)

Returns the value of the requested column as a byte array.

The result and whether this method throws an exception when the column value is null or the column type is not a blob type is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a byte array.

public String[] getColumnNames ()

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.

Returns

the names of the columns returned in this query.

public int getCount ()

Returns the numbers of rows in the cursor.

Returns

the number of rows in the cursor.

public double getDouble (int column)

Returns the value of the requested column as a double.

The result and whether this method throws an exception when the column value is null, the column type is not a floating-point type, or the floating-point value is not representable as a double value is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a double.

public float getFloat (int column)

Returns the value of the requested column as a float.

The result and whether this method throws an exception when the column value is null, the column type is not a floating-point type, or the floating-point value is not representable as a float value is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a float.

public int getInt (int column)

Returns the value of the requested column as an int.

The result and whether this method throws an exception when the column value is null, the column type is not an integral type, or the integer value is outside the range [Integer.MIN_VALUE, Integer.MAX_VALUE] is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as an int.

public long getLong (int column)

Returns the value of the requested column as a long.

The result and whether this method throws an exception when the column value is null, the column type is not an integral type, or the integer value is outside the range [Long.MIN_VALUE, Long.MAX_VALUE] is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a long.

public short getShort (int column)

Returns the value of the requested column as a short.

The result and whether this method throws an exception when the column value is null, the column type is not an integral type, or the integer value is outside the range [Short.MIN_VALUE, Short.MAX_VALUE] is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a short.

public String getString (int column)

Returns the value of the requested column as a String.

The result and whether this method throws an exception when the column value is null or the column type is not a string type is implementation-defined.

Parameters

column	the zero-based index of the target column.

Returns

the value of that column as a String.

public int getType (int column)

Returns data type of the given column's value. The preferred type of the column is returned but the data may be converted to other types as documented in the get-type methods such as getInt(int), getFloat(int) etc.

Returned column types are

Parameters

column	the zero-based index of the target column.

Returns

column value type

public boolean isNull (int column)

Returns true if the value in the indicated column is null.

Parameters

column	the zero-based index of the target column.

Returns

whether the column value is null.

public MatrixCursor.RowBuilder newRow ()

Adds a new row to the end and returns a builder for that row. Not safe for concurrent use.

Returns

builder which can be used to set the column values for the new row

public void registerContentObserver (ContentObserver observer)

Register an observer that is called when changes happen to the content backing this cursor. Typically the data set won't change until requery() is called.

Parameters

observer	the object that gets notified when the content backing the cursor changes.

public void registerDataSetObserver (DataSetObserver 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 requery(), deactivate(), or close().

Parameters

observer	the object that gets notified when the cursors data set changes.

public void unregisterContentObserver (ContentObserver observer)

Unregister an observer that has previously been registered with this cursor via registerContentObserver(ContentObserver).

Parameters

observer	the object to unregister.

public void unregisterDataSetObserver (DataSetObserver observer)

Unregister an observer that has previously been registered with this cursor via registerContentObserver(ContentObserver).

Parameters

observer	the object to unregister.

Interfaces

Classes

Enums

Exceptions

MatrixCursor

Class Overview

Summary

Public Constructors

public MatrixCursor (String[] columnNames, int initialCapacity)

Parameters

public MatrixCursor (String[] columnNames)

Parameters

Public Methods

public void addRow (Object[] columnValues)

Parameters

Throws

public void addRow (Iterable<?> columnValues)

Parameters

Throws

public void copyStringToBuffer (int columnIndex, CharArrayBuffer buffer)

Parameters

public byte[] getBlob (int column)

Parameters

Returns

public String[] getColumnNames ()

Returns

public int getCount ()

Returns

public double getDouble (int column)

Parameters

Returns

public float getFloat (int column)

Parameters

Returns

public int getInt (int column)

Parameters

Returns

public long getLong (int column)

Parameters

Returns

public short getShort (int column)

Parameters

Returns

public String getString (int column)

Parameters

Returns

public int getType (int column)

Parameters

Returns

public boolean isNull (int column)

Parameters

Returns

public MatrixCursor.RowBuilder newRow ()

Returns

public void registerContentObserver (ContentObserver observer)

Parameters

public void registerDataSetObserver (DataSetObserver observer)

Parameters

public void unregisterContentObserver (ContentObserver observer)

Parameters

public void unregisterDataSetObserver (DataSetObserver observer)

Parameters