how to access current Project in eclipse?

在上篇文章，给出来在eclipse plugin 中访问eclipse workspace 从而访问该workspace下所有project的方案，这篇文章提供了如何访问current project的方案。

I WorkSpace以及相关的类不提供直接访问current project的方法,所以只能走其他途径.

在我们的plugin中,我们要提供界面入口,比如 PopMenu ActionMenu 等之类的,这些界面入口是要实现一些接口的,例如:PopMenu要实现IObjectActionDelegate,这个接口有几个方法,其中 public void selectionChanged(IAction action, ISelection selection) ;这个方法很早重要,可以通过ISelection获得当前选择中的Project.

ISelection共有三个子接口,分别对应三个实现类,那么通过判断ISelection的实际类型可以获得其子接口的引用,然后对其遍历,通过getAdaptor方法获得所有的选择的IResource的引用,再进一步对IResource进行类型识别,得到IResource.PROJECT类型的元素即为IProject的引用.

下面是程序:

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Iterator;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

/**
* @author Kobye
*/
public class TestPopMenu implements IObjectActionDelegate {
private IStructuredSelection selection;

/**
* Constructor for Action1.
*/
public TestPopMenu () {
super();
}

/**
* @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
*/
public void setActivePart(IAction action, IWorkbenchPart targetPart) {

}

/**
* @see IActionDelegate#run(IAction)
*/
public void run(IAction action) {
Shell shell = new Shell();
MessageDialog.openInformation(
shell,
"Pop Plug-in",
"New Action was executed.");

}

public static Object getAdapter(Object adaptable, Class c) {
if (c.isInstance(adaptable)) {
return adaptable;
}
if (adaptable instanceof IAdaptable) {
IAdaptable a = (IAdaptable) adaptable;
Object adapter = a.getAdapter(c);
if (c.isInstance(adapter)) {
return adapter;
}
}
return null;
}

/***
* 这个方法和下面的方法很重要。
* @param selection
* @param c
* @return
*/
private Object[] getSelectedResources(IStructuredSelection selection,Class c) {
return getSelectedAdaptables(selection, c);
}

private static Object[] getSelectedAdaptables(ISelection selection, Class c) {
ArrayList result = null;
if (!selection.isEmpty()) {
result = new ArrayList();
Iterator elements = ((IStructuredSelection) selection).iterator();
while (elements.hasNext()) {
Object adapter = getAdapter(elements.next(), c);
if (c.isInstance(adapter)) {
result.add(adapter);
}
}
}
if (result != null && !result.isEmpty()) {
return result.toArray((Object[])Array.newInstance(c, result.size()));
}
return (Object[])Array.newInstance(c, 0);
}

/**
* 这个方法保存了ISelection的引用，
* 请注意：ISelection的实际类型因不同的应用，其实际类型可能不同，
* 共有三种可能，请查阅eclipse API。
*
* @see IActionDelegate#selectionChanged(IAction, ISelection)
*/
public void selectionChanged(IAction action, ISelection selection) {
this.selection = (IStructuredSelection) selection;
System.out.println("current project name==="+this.getProject().getName());
}

/**
* 这个方法可以得到current project。
*
* @return
*/
private IProject getProject(){
IResource[]rs = (IResource[])getSelectedResources((IStructuredSelection)selection,IResource.class);
IProject project = null;
for(int i =0;i<rs.length;i++){
IResource r = rs[i];
if(r.getType()==IResource.PROJECT){
project = (IProject) r;
break;
}
}
return project;
}
}