org.eclipse.ui.editors/src/org/eclipse/ui/internal/editors/text/OpenExternalFileAction.java

/**********************************************************************
Copyright (c) 2000, 2003 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
	IBM Corporation - Initial implementation
**********************************************************************/
package org.eclipse.ui.internal.editors.text;

import java.io.File;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.FileDialog;

import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;

import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.part.FileEditorInput;

/**
 * @since 3.0
 */
public class OpenExternalFileAction extends Action implements IWorkbenchWindowActionDelegate {

	private IWorkbenchWindow fWindow;

	public OpenExternalFileAction() {
		setEnabled(true);
	}

	/*
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#dispose()
	 */
	public void dispose() {
		fWindow= null;
	}

	/*
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#init(org.eclipse.ui.IWorkbenchWindow)
	 */
	public void init(IWorkbenchWindow window) {
		fWindow= window;
	}

	/*
	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
	 */
	public void run(IAction action) {
		run();
	}

	/*
	 * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
	}

	private File queryFile() {
		FileDialog dialog= new FileDialog(fWindow.getShell(), SWT.OPEN);
		dialog.setText(TextEditorMessages.getString("OpenExternalFileAction.dialog.text")); //$NON-NLS-1$
		String path= dialog.open();
		if (path != null)
			return new File(path);
		return null;
	}

	/*
	 * @see org.eclipse.jface.action.Action#run()
	 */
	public void run() {
		File file= queryFile();
		if (file != null && file.exists()) {
			IEditorInput input= createEditorInput(file);
			String editorId= getEditorId(file);
			IWorkbenchPage page= fWindow.getActivePage();
			try {
				page.openEditor(input, editorId);
			} catch (PartInitException e) {
				e.printStackTrace();
			}
		}
	}

	private String getEditorId(File file) {
		IWorkbench workbench= fWindow.getWorkbench();
		IEditorRegistry editorRegistry= workbench.getEditorRegistry();
		IEditorDescriptor descriptor= editorRegistry.getDefaultEditor(file.getName());
		if (descriptor != null)
			return descriptor.getId();
		return "org.eclipse.ui.DefaultTextEditor"; //$NON-NLS-1$
	}

	private IEditorInput createEditorInput(File file) {
		IFile workspaceFile= getWorkspaceFile(file);
		if (workspaceFile != null)
			return new FileEditorInput(workspaceFile);
		return new JavaFileEditorInput(file);
	}
	
	private IFile getWorkspaceFile(File file) {
		IWorkspace workspace= ResourcesPlugin.getWorkspace();
		IPath location= new Path(file.getAbsolutePath());
		return workspace.getRoot().getFileForLocation(location);		
	}
}