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

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation 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 API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal.editors.text;

import java.io.File;
import java.text.MessageFormat;

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.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.window.Window;

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.dialogs.ElementListSelectionDialog;
import org.eclipse.ui.editors.text.EditorsUI;
import org.eclipse.ui.part.FileEditorInput;

/**
 * @since 3.0
 */
public class OpenExternalFileAction extends Action implements IWorkbenchWindowActionDelegate {
	
	static class FileLabelProvider extends LabelProvider {
		/*
		 * @see org.eclipse.jface.viewers.LabelProvider#getText(java.lang.Object)
		 */
		public String getText(Object element) {
			if (element instanceof IFile) {
				IPath path=  ((IFile) element).getFullPath();
				return path != null ? path.toString() : ""; //$NON-NLS-1$
			}
			return super.getText(element);
		}
	}
	
	
	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 && path.length() > 0)
			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();
			}
		} else if (file != null) {
			String msgFmt = TextEditorMessages.getString("OpenExternalFileAction.FileNotFound"); //$NON-NLS-1$
			String msg = MessageFormat.format(msgFmt, new String[] {file.getName()});
			MessageDialog.openWarning(fWindow.getShell(), TextEditorMessages.getString("OpenExternalFileAction.dialog.text"), msg); //$NON-NLS-1$
		}
	}

	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 EditorsUI.DEFAULT_TEXT_EDITOR_ID;
	}

	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());
		IFile[] files= workspace.getRoot().findFilesForLocation(location);
		if (files == null || files.length == 0)
			return null;
		if (files.length == 1)
			return files[0];
		return selectWorkspaceFile(files);
	}

	private IFile selectWorkspaceFile(IFile[] files) {
		ElementListSelectionDialog dialog= new ElementListSelectionDialog(fWindow.getShell(), new FileLabelProvider());
		dialog.setElements(files);
		dialog.setTitle(TextEditorMessages.getString("OpenExternalFileAction.SelectWorkspaceFile")); //$NON-NLS-1$
		dialog.setMessage(TextEditorMessages.getString("OpenExternalFileAction.FileLinkedtoMultiple")); //$NON-NLS-1$
		if (dialog.open() == Window.OK)
			return (IFile) dialog.getFirstResult();
		return null;
	}
}