Java tutorial
/******************************************************************************* * Copyright (c) 2007, 2008 Edgar Espina. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * *******************************************************************************/ package org.deved.antlride.internal.ui.preferences; import java.io.IOException; import java.net.MalformedURLException; import java.util.Enumeration; import java.util.jar.JarEntry; import java.util.jar.JarFile; import org.deved.antlride.core.AntlrCore; import org.deved.antlride.core.resources.AntlrLanguageTarget; import org.deved.antlride.core.resources.AntlrLanguageTargetRepository; import org.deved.antlride.core.resources.AntlrPackage; import org.deved.antlride.ui.dialogs.AntlrBaseDialog; import org.eclipse.core.runtime.IPath; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Path; import org.eclipse.core.runtime.Status; import org.eclipse.jface.dialogs.ErrorDialog; import org.eclipse.jface.dialogs.IMessageProvider; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.ComboViewer; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.FileDialog; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class AntlrLanguageTargetDialog extends AntlrBaseDialog { private class CreateLanguageTargetTask implements SelectionListener { public void widgetDefaultSelected(SelectionEvent e) { } public void widgetSelected(SelectionEvent e) { FileDialog dialog = new FileDialog(getShell()); String file = dialog.open(); if (file != null) { createLanguageTarget(file); } } } private static final IStatus INVALID_LANGUAGE = new Status(IStatus.ERROR, AntlrCore.PLUGIN_ID, "Invalid file"); private AntlrPackage selectedPackage; private String title; private Text languageText; private AntlrLanguageTarget languageTarget; private IPath languagePath; protected AntlrLanguageTarget parentTarget; public AntlrLanguageTargetDialog(Shell parentShell, String title) { super(parentShell); this.title = title; } private void createLanguageTarget(String file) { languagePath = null; String language = null; try { JarFile jarFile = new JarFile(file); Enumeration<JarEntry> entries = jarFile.entries(); IPath root = Path.fromPortableString(AntlrLanguageTargetRepository.STRING_TEMPLATE_PATH); while (entries.hasMoreElements()) { JarEntry entry = entries.nextElement(); IPath path = Path.fromPortableString(entry.getName()); IPath parent = path.removeLastSegments(1); if (parent.equals(root)) { languagePath = Path.fromOSString(file); language = path.lastSegment(); break; } } jarFile.close(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } if (languagePath != null) { languageText.setText(language); } else { ErrorDialog.openError(getShell(), "Invalid language target", "Can't find an language target", INVALID_LANGUAGE); } } @Override protected Point getDefaultSize() { return new Point(383, 250); } @Override protected String getDialogName() { return "registerLanguageTarget"; } @Override protected Control createDialogArea(Composite parent) { GridData gd = null; Composite area = (Composite) super.createDialogArea(parent); getShell().setText(title); Composite composite = new Composite(area, SWT.NONE); composite.setLayoutData(new GridData(GridData.FILL_BOTH)); GridLayout layout = new GridLayout(3, false); composite.setLayout(layout); Label label = new Label(composite, SWT.NONE); label.setText("Name:"); languageText = new Text(composite, SWT.READ_ONLY | SWT.BORDER); gd = new GridData(GridData.FILL_HORIZONTAL); languageText.setLayoutData(gd); Button button = new Button(composite, SWT.PUSH); button.setText("Browse..."); button.addSelectionListener(new CreateLanguageTargetTask()); label = new Label(composite, SWT.NONE); label.setText("Parent:"); ComboViewer comboViewer = new ComboViewer(composite); comboViewer.setContentProvider(new ArrayContentProvider()); comboViewer.setInput(selectedPackage.getLanguageTargets()); comboViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { IStructuredSelection selection = (IStructuredSelection) event.getSelection(); parentTarget = (AntlrLanguageTarget) selection.getFirstElement(); validate(); } }); return composite; } @Override protected void okPressed() { languageTarget = null; if (validate()) { languageTarget = AntlrLanguageTargetRepository.create(parentTarget, languageText.getText(), languagePath.toOSString()); AntlrLanguageTargetRepository.save(languageTarget); super.okPressed(); } } @Override protected void cancelPressed() { languageTarget = null; super.cancelPressed(); } public AntlrLanguageTarget getLanguageTarget() { return languageTarget; } private boolean validate() { if (languagePath == null) { setMessage("No language target defined", IMessageProvider.ERROR); return false; } if (parentTarget == null) { setMessage("Select a parent language", IMessageProvider.ERROR); return false; } if (AntlrLanguageTargetRepository.exists(languagePath.lastSegment())) { setMessage("Duplicated language: " + languagePath.lastSegment(), IMessageProvider.ERROR); return false; } setDefaultMessage(); return true; } private void setDefaultMessage() { setMessage("Register a new language target for ANTLR", IMessageProvider.INFORMATION); } @Override protected void setTitle() { setTitle("Add language target"); setDefaultMessage(); } public void setInput(AntlrPackage selectedPackage) { this.selectedPackage = selectedPackage; } }