在Eclipse RCP中屏蔽Eclipse扩展点自带的General功能

 在自己的Eclipse的RCP产品中，可能经常要集成第三方的插件，来满足特定的功能需要，但是对于一些不需要的功能，通常的做法是该插件修改源代码，如果出于许可或非开源的原因，无法修改，或删除其源代码，就要考虑如何在RCP中控制其扩展点的加载。

       可以在RCP的WorkbenchWindowAdvisor.preWindowOpen中，取到所有加载的扩展点，然后进行相应的过滤处理首先使用WorkbenchPlugin.getDefault（）得到WorkbenchPlugin;。通过WorkbenchPlugin可以获取各种类型的扩展点的注册表WorkbenchPlugin 。getActionSetRegistry（）得到的注册表中存有所有的ActionSet扩展点; WorkbenchPlugin.getViewRegistry（）得到了所有的意见，扩展点通过注册表的removeExtension（）可以去掉相应的扩展点，使其不被加载到RCP中。

     具体使用方法如下：

1、（移除wizard中的General）// 移除文件菜单下导入功能中自带的General

AbstractExtensionWizardRegistry importWizardRegistry = (AbstractExtensionWizardRegistry) WorkbenchPlugin

   .getDefault().getImportWizardRegistry();

IWizardCategory[] categories = wizardRegistry.getRootCategory().getCategories();

for (int i = 0; i < categories.length; i++){

if(categories[i].getId().equals("org.eclipse.ui.Basic")){

IWizardDescriptor[] wizard = categories[i].getWizards();

IExtensionRegistry registry = Platform.getExtensionRegistry();

IExtensionPoint point = registry.getExtensionPoint("org.eclipse.ui.importWizards");

IExtension[] extensions = point.getExtensions();

for (int j = 0; j < wizard.length; j++){

wizardRegistry.removeExtension(extensions[i],

   new Object[] {wizard[j] });

}

}

}

2、（移除wizard中的General）// 移除文件菜单下导出功能中自带的General

AbstractExtensionWizardRegistry exportWizardRegistry = (AbstractExtensionWizardRegistry) WorkbenchPlugin

   .getDefault().getExportWizardRegistry();

IWizardCategory[] categories = wizardRegistry.getRootCategory().getCategories();

for (int i = 0; i < categories.length; i++){

if(categories[i].getId().equals("org.eclipse.ui.Basic")){

IWizardDescriptor[] wizard = categories[i].getWizards();

IExtensionRegistry registry = Platform.getExtensionRegistry();

IExtensionPoint point = registry.getExtensionPoint("org.eclipse.ui.exportWizards");

IExtension[] extensions = point.getExtensions();

for (int j = 0; j < wizard.length; j++){

wizardRegistry.removeExtension(extensions[i],

   new Object[] {wizard[j] });

}

}

}

3、（移除view中的General）// 移除窗口菜单下显示视图中自带的General

ViewRegistry viewRegistry = (ViewRegistry) WorkbenchPlugin.getDefault().getViewRegistry();

IViewCategory[] viewCat = viewRegistry.getCategories();

for (int i = 0; i < viewCat.length; i++){

if(viewCat[i].getId().equals("org.eclipse.ui")){

IViewDescriptor[] viewDes = viewCat[i].getViews();

IExtensionRegistry registry = Platform.getExtensionRegistry();

IExtensionPoint point = registry.getExtensionPoint("org.eclipse.ui.views");

IExtension[] extensions = point.getExtensions();

for (int j = 0; j < viewDes.length; j++){

if(!viewDes[j].getId().equals("org.eclipse.ui.console.ConsoleView")){

viewRegistry.removeExtension(extensions[i],

   new Object[] {viewDes[j] });

}

}

}

}

4、（移除ActionSet中的General）

ActionSetRegistry reg = WorkbenchPlugin.getDefault().getActionSetRegistry();
IActionSetDescriptor[] actionSets = reg.getActionSets();
// removing annoying gotoLastPosition Message.
String actionSetId = "org.eclipse.ui.edit.text.actionSet.navigation"; //$NON-NLS-1$
for (int i = 0; i <actionSets.length; i++)
{
    if (!actionSets[i].getId().equals(actionSetId))
        continue;
        IExtension ext = actionSets[i].getConfigurationElement()
            .getDeclaringExtension();
        reg.removeExtension(ext, new Object[] { actionSets[i] });
}
// Removing convert line delimiters menu.
actionSetId = "org.eclipse.ui.edit.text.actionSet.convertLineDelimitersTo"; //$NON-NLS-1$
for (int i = 0; i <actionSets.length; i++)
{
    if (!actionSets[i].getId().equals(actionSetId))
        continue;
    IExtension ext = actionSets[i].getConfigurationElement()
            .getDeclaringExtension();
   reg.removeExtension(ext, new Object[] { actionSets[i] });
}