Package org.eclipse.jface.preference

Class PreferenceMemento

java.lang.Object

org.eclipse.jface.preference.PreferenceMemento

public class PreferenceMemento
extends Object

A utility to change and remember preference values and later restore there original value. The first time a preference value is changed its current value is stored. Later you can reset all preference values (which are changed through this class) to the state they had when creating the memento.

This class is most useful for testing to prevent leakage of preference changes between individual tests.

Since:

3.18

Constructor Summary

Constructors

Constructor	Description
PreferenceMemento()

Method Summary

Modifier and Type	Method	Description
void	resetPreferences()	Reset every preference changed by this utility to its state before the first change.
<T> void	setValue(IPreferenceStore store, String name, T value)	Set the value for the given preference on the given store.

Methods inherited from class java.lang.Object

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

Constructor Details

PreferenceMemento

public PreferenceMemento()

Method Details

setValue

public <T> void setValue(IPreferenceStore store,
 String name,
 T value)

Set the value for the given preference on the given store.

The first time this preference is changed its value before change is remembered and can later be restored using resetPreferences().

Type Parameters:

T - the preference value type. The type must have a corresponding IPreferenceStore setter.

Parameters:

store - the preference store to manipulate (not null)

name - the name of the preference (not null)

value - the new current value of the preference.

Throws:

IllegalArgumentException - when setting a type which is not supported by IPreferenceStore

See Also:

• IPreferenceStore.setValue(String, double)
• IPreferenceStore.setValue(String, float)
• IPreferenceStore.setValue(String, int)
• IPreferenceStore.setValue(String, long)
• IPreferenceStore.setValue(String, boolean)
• IPreferenceStore.setValue(String, String)
• resetPreferences()

resetPreferences

public void resetPreferences()

Reset every preference changed by this utility to its state before the first change. After this the instance can still be used as if it was just created.