SUMMARY in Java

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125 SUMMARY
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Almost any significant plug-in will contain global options controlling its execution and interaction with the user In this chapter, we explored the Eclipse preference page API and discussed the choices open to the developer for creating both simple and complex preference pages We also demonstrated how to persist preference settings across workspace sessions
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REFERENCES
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Creasey, Tod, Preferences in the Eclipse Workbench UI http://wwweclipseorg/articles/Article-Preferences/preferenceshtm Cooper, Ryan, Simplifying Preference Pages with Field Editors http://wwweclipseorg/articles/Article-Field-Editors/field_editorshtml
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C H A P T E R
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Properties
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Whereas preferences apply to plug-ins or chunks of functionality,
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properties apply to resources or other objects that appear in the Eclipse environment One typical way to access an object s properties is to select the Properties command from its context menu, opening the Properties dialog Another way is to open the Properties view, which displays properties for the selected object This chapter covers the creation of a property on a particular object and the display of that property in both the object s Properties dialog and the Properties view
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TT 13 Properties
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131 CREATING PROPERTIES
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We want to add properties for color and comment to our Favorites product The color property will determine the color used to display the item in the Favorites view, while the comment property will be displayed as the item s hover help Since properties are associated with objects, we must decide which type of object will contain our properties We ll add the color property to favorites items; when an item is removed from the Favorites view, the color property is discarded In contrast, we want the comment property associated with the resource behind the favorites item so that when the resource is removed and then added to the Favorites view, the comment property will be preserved
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FavoriteItem properties
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A property can be associated with an object in many different ways, but typically a property value is accessed through get and set methods on the ob-
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Creating properties
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ject itself For the favorites items, we need to add accessor methods to the
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IFavoriteItem
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interface for the new color property
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Color getColor(); void setColor(Color color);
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Because this property is to be implemented identically across all favorites items, we will place this behavior into a new abstract superclass called
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BasicFavoriteItem
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which all of our other item types will extend
package comqualityeclipsefavoritesmodel; import import import import import javautil*; orgeclipsecoreruntime*; orgeclipseswtgraphics*; orgeclipseswtwidgets*; comqualityeclipsefavorites*;
public class BasicFavoriteItem { private Color color; public Color getColor() { if (color == null) return getDefaultColor(); return color; } public void setColor(Color color) { thiscolor = color; } public static Color getDefaultColor() { if (defaultColor == null) defaultColor = getColor(new RGB(0, 0, 0)); return defaultColor; }
TT 13 Properties
public static void setDefaultColor(Color color) { defaultColor = color; } }
There are two types of properties: Persistent properties and Session properties Persistent properties are preserved across multiple workbench sessions while session property values are discarded when Eclipse exits In order to persist the color property across multiple sessions, we would need to modify the loading and saving methods outlined in Section 752 This is left as an exercise for the reader and for now the color property will be not be preserved across sessions A Color object has an underlying operating system resource and must be managed properly Add BasicFavoriteItem utility methods to cache, reuse, and dispose of colors:
private static final Map colorCache = new HashMap(); private static Color defaultColor; public static Color getColor(RGB rgb) { Color color = (Color) colorCacheget(rgb); if (color == null) { Display display = DisplaygetCurrent(); color = new Color(display, rgb); colorCacheput(rgb, color); } return color; }
Creating properties
public static void disposeColors() { Iterator iter = colorCachevalues()iterator(); while (iterhasNext()) ((Color) iternext())dispose(); colorCacheclear(); }
When the Favorites plug-in shuts down, we must clean up any Color objects that we have been managing Add the following line to the FavoritesPluginshutdown()
method
BasicFavoriteItemdisposeColors();
Resource properties
Eclipse has a generic mechanism for associating properties with resources that we can use to store our resource comment Methods in IResource provide both session properties, which are discarded when Eclipse exits, and persistent properties, which are preserved across multiple workspace sessions:
getPersistentProperty(QualifiedName)