com.vaadin.client.data

Class AbstractRemoteDataSource.RowHandleImpl

java.lang.Object

com.vaadin.client.data.DataSource.RowHandle<T>

com.vaadin.client.data.AbstractRemoteDataSource.RowHandleImpl

Enclosing class:

AbstractRemoteDataSource<T>

protected class AbstractRemoteDataSource.RowHandleImpl
extends DataSource.RowHandle<T>

Constructor Summary

Constructors

Constructor and Description
RowHandleImpl(T row, Object key)

Method Summary

Modifier and Type	Method and Description
protected boolean	equalsExplicit(Object obj) An explicit override for Object.equals(Object).
T	getRow() Gets the most recent representation for the row this handle represents.
protected int	hashCodeExplicit() An explicit override for Object.hashCode().
boolean	isPinned()
void	pin() Marks this row as pinned.
void	setRow(T row) A method for the data source to update the row data.
void	unpin() Marks this row as unpinned.
void	updateRow() Informs the DataSource that the row data represented by this RowHandle has been updated.

Methods inherited from class com.vaadin.client.data.DataSource.RowHandle

equals, hashCode

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RowHandleImpl

public RowHandleImpl(T row,
                     Object key)

Method Detail

setRow

public void setRow(T row)

A method for the data source to update the row data.

Parameters:

row - the updated row object

getRow

public T getRow()
         throws IllegalStateException

Description copied from class: DataSource.RowHandle

Gets the most recent representation for the row this handle represents.

Specified by:

getRow in class DataSource.RowHandle<T>

Returns:

the most recent representation for the row this handle represents

Throws:

IllegalStateException - if this row handle isn't currently pinned

See Also:

DataSource.RowHandle.pin()

isPinned

public boolean isPinned()

pin

public void pin()

Description copied from class: DataSource.RowHandle

Marks this row as pinned.

Note: Pinning a row multiple times requires an equal amount of unpins to free the row from the "pinned" status.

Technical Note: Pinning a row makes sure that the row object for a particular set of data is always kept as up to date as the data source is able to. Since the DataSource might create a new instance of an object, object references aren't necessarily kept up-to-date. This is a technical work-around for that.

Specified by:

pin in class DataSource.RowHandle<T>

See Also:

DataSource.RowHandle.unpin()

unpin

public void unpin()
           throws IllegalStateException

Description copied from class: DataSource.RowHandle

Marks this row as unpinned.

Note: Pinning a row multiple times requires an equal amount of unpins to free the row from the "pinned" status.

Technical Note: Pinning a row makes sure that the row object for a particular set of data is always kept as up to date as the data source is able to. Since the DataSource might create a new instance of an object, object references aren't necessarily kept up-to-date. This is a technical work-around for that.

Specified by:

unpin in class DataSource.RowHandle<T>

Throws:

IllegalStateException - if this row handle has not been pinned before

See Also:

DataSource.RowHandle.pin()

equalsExplicit

protected boolean equalsExplicit(Object obj)

Description copied from class: DataSource.RowHandle

An explicit override for Object.equals(Object). This method should be functionally equivalent to a properly implemented equals method.

Having a properly implemented equals method is imperative for RowHandle to function. Because Java has no mechanism to force an override of an existing method, we're defining a new method for that instead.

Specified by:

equalsExplicit in class DataSource.RowHandle<T>

Returns:

true if this object is the same as the obj argument; false otherwise.

hashCodeExplicit

protected int hashCodeExplicit()

Description copied from class: DataSource.RowHandle

An explicit override for Object.hashCode(). This method should be functionally equivalent to a properly implemented hashCode method.

Having a properly implemented hashCode method is imperative for RowHandle to function. Because Java has no mechanism to force an override of an existing method, we're defining a new method for that instead.

Specified by:

hashCodeExplicit in class DataSource.RowHandle<T>

Returns:

a hash code value for this object

updateRow

public void updateRow()

Description copied from class: DataSource.RowHandle

Informs the DataSource that the row data represented by this RowHandle has been updated. DataChangeHandler for the DataSource should be informed that parts of data have been updated.

Specified by:

updateRow in class DataSource.RowHandle<T>

See Also:

DataChangeHandler.dataUpdated(int, int)