Eclipse外掛開發之command

Eclipse提供了三種命令與操作的方式:動作ActionSets、彈出選單popupmenus、命令Command，其中前兩種因為耦合過於緊密，在未來版本中可能棄用，不建議使用。

ActionSets方式使用的是擴充套件點org.eclipse.ui.actionsets;

popupmenus方式使用了一個擴充套件點：org.eclipse.ui.popupmenus;

Command方式使用了三個擴充套件點：org.eclipse.ui.menus; org.eclipse.ui.commands;org.eclipse.ui.handlers;

命令代表了外觀和行為之間的抽象。命令本身不代表外觀和行為，其捆綁一個或多個有一個或多個處理程式（行為）的Menu共享（外觀）。

下面開發一個在資源管理中開啟資源的外掛，如在java包或檔案中右鍵點選，開啟資原始檔。通過command定義擴充套件點。

1.       增加依賴

2.       新增擴充套件點

xml配置如下：

<extension

point="org.eclipse.ui.commands">

<category

name="Sample Category"

id="com.cnofe.explorer.commands.category">

</category>

<command

name="Explorer(定位資源位置)"

categoryId="com.cnofe.explorer.commands.category"

id="com.cnofe.explorer.commands.sampleCommand">

</command>

</extension>

<extension

point="org.eclipse.ui.handlers">

<handler

commandId="com.cnofe.explorer.commands.sampleCommand"

class="com.cnofe.explorer.handlers.OpenExplorerHandler">

</handler>

</extension>

<extension

point="org.eclipse.ui.bindings">

<key

commandId="com.cnofe.explorer.commands.sampleCommand"

contextId="org.eclipse.ui.contexts.window"

sequence="ALT+O"

schemeId="org.eclipse.ui.defaultAcceleratorConfiguration">

</key>

</extension>

<extension

point="org.eclipse.ui.menus">

<menuContribution

allPopups="false"

locationURI="popup:org.eclipse.ui.popup.any?after=additions">

<separator

name="com.cnofe.explorer.separator1">

</separator>

<command

commandId="com.cnofe.explorer.commands.sampleCommand"

icon="icons/folderlink.png"

style="push">

<visibleWhen>

<iterateifEmpty="false">

<or>

<instanceof

value="org.eclipse.team.ui.synchronize.ISynchronizeModelElement">

</instanceof>

<instanceof

value="org.eclipse.jdt.core.IJavaElement">

</instanceof>

<instanceof

value="org.eclipse.core.resources.IResource">

</instanceof>

</or>

</iterate>

</visibleWhen>

</command>

</menuContribution>

</extension>

3.       實現handler

publicclass OpenExplorerHandler extends AbstractHandler {

public Object execute(ExecutionEvent event) throws ExecutionException {

IWorkbenchWindow window = HandlerUtil

.getActiveWorkbenchWindowChecked(event);

ISelection sel = window.getSelectionService().getSelection();

if (selinstanceof IStructuredSelection) {

Object obj = ((IStructuredSelection) sel).getFirstElement();

IResource resource = null;

String path = null;

// common resource file

if (objinstanceof IFile) {

resource = (IResource) obj;

path = resource.getLocation().toOSString();

path = path.substring(0, path.lastIndexOf(File.separator));

}

// other resource such as folder,project

elseif (objinstanceof IResource) {

resource = (IResource) obj;

path = resource.getLocation().toOSString();

}

// explorer java element, containfield,method,package

elseif (objinstanceof IJavaElement) {

// jar resource is null

if (objinstanceof JarPackageFragmentRoot) {

path = ((IPackageFragmentRoot) obj).getPath().toOSString();

// get folder

path = path.substring(0, path.lastIndexOf(File.separator));

} elseif (objinstanceof IPackageFragmentRoot) {

// src folder

String prjPath = ((IPackageFragmentRoot) obj)

.getJavaProject().getProject().getParent()

.getLocation().toOSString();

path = prjPath

+((IPackageFragmentRoot) obj).getPath()

.toOSString();

} elseif (objinstanceof IPackageFragment) {// other : package

resource = ((IPackageFragment) obj).getResource();

path = resource.getLocation().toOSString();

} else {// member:filed:

resource = ((IJavaElement) obj).getResource();

path = resource.getLocation().toOSString();

// get folder

path = path.substring(0, path.lastIndexOf(File.separator));

}

}

// explorer team ui resource

elseif (objinstanceof ISynchronizeModelElement) {

resource = ((ISynchronizeModelElement) obj).getResource();

}

if (path != null) {

try {

Runtime.getRuntime().exec("explorer " + path); //$NON-NLS-1$

} catch (IOException e) {

//

}

}

}

returnnull;

}

}

4.       執行截圖