選んだプロジェクトのsrcフォルダにファイルを作る

ものすごい無駄なことしてるだろうから後でなおさなきゃ…
とりあえずメモ

package org.okazuki.sample.plugin.actions;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
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.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public class CreateFileAction implements IWorkbenchWindowActionDelegate {

	private IWorkbenchWindow window;

	private IJavaProject javaProject;

	public void dispose() {
	}

	public void init(IWorkbenchWindow window) {
		this.window = window;
	}

	public void run(IAction action) {
		IFolder srcRes = javaProject.getProject().getFolder("src");
		if (srcRes == null) {
			MessageDialog.openConfirm(window.getShell(), "情報", "srcフォルダがみつからん");
			return;
		}

		createFile(srcRes);
	}

	private void createFile(IFolder srcFolder) {
		IFile helloFile = srcFolder.getFile("hello.txt");
		try {
			ByteArrayOutputStream os = new ByteArrayOutputStream();
			os.write("Hello world".getBytes());
			os.flush();
			helloFile.create(new ByteArrayInputStream(os.toByteArray()), true,
					new NullProgressMonitor());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void selectionChanged(IAction action, ISelection selection) {
		if (selection instanceof IStructuredSelection) {
			IStructuredSelection structuredSelection = (IStructuredSelection) selection;
			Object selectionObject = structuredSelection.getFirstElement();
			if (selectionObject instanceof IJavaElement) {
				IJavaElement javaElement = (IJavaElement) selectionObject;
				javaProject = javaElement.getJavaProject();
			}
		}
	}

}