Java tutorial
/******************************************************************************* * Copyright (c) 2008 IBM Corporation and others. * 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 * * Contributors: * Remy Suen <remy.suen@gmail.com> - initial API and implementation *******************************************************************************/ package org.emonic.base.preferences; import java.io.File; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import org.eclipse.core.runtime.preferences.IEclipsePreferences; import org.eclipse.core.runtime.preferences.InstanceScope; import org.eclipse.jface.preference.PreferencePage; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.CheckStateChangedEvent; import org.eclipse.jface.viewers.CheckboxTableViewer; import org.eclipse.jface.viewers.ICheckStateListener; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.window.Window; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; 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.Label; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import org.emonic.base.EMonoPlugin; import org.emonic.base.framework.FrameworkInstall; import org.emonic.base.framework.IDotNetDebugConstants; import org.emonic.base.framework.IFrameworkInstall; import org.osgi.service.prefs.BackingStoreException; import org.osgi.service.prefs.Preferences; public class FrameworksPreferencePage extends PreferencePage implements IWorkbenchPreferencePage { public static final String PAGE_ID = "org.emonic.base.preferences.frameworksPreferencePage"; //$NON-NLS-1$ private CheckboxTableViewer frameworksViewer; private Button addFrameworkBtn; private Button editFrameworkBtn; private Button removeFrameworkBtn; private List installs; private IEclipsePreferences preferences; public FrameworksPreferencePage() { setDescription(FrameworkMessages.FrameworksPreferencePage_Description); } private void addListeners() { frameworksViewer.addCheckStateListener(new ICheckStateListener() { public void checkStateChanged(CheckStateChangedEvent e) { if (e.getChecked()) { Object element = e.getElement(); frameworksViewer.setCheckedElements(new Object[] { element }); setErrorMessage(null); setValid(true); } else { setErrorMessage(FrameworkMessages.FrameworksPreferencePage_SelectDefaultFrameworkError); setValid(false); } } }); frameworksViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent e) { IStructuredSelection iss = (IStructuredSelection) e.getSelection(); int size = iss.size(); if (size == frameworksViewer.getTable().getItems().length) { // don't let the user remove every single item in // the table removeFrameworkBtn.setEnabled(false); } else { removeFrameworkBtn.setEnabled(true); } // the user can only edit one framework at a time editFrameworkBtn.setEnabled(size == 1); } }); addFrameworkBtn.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { AddFrameworkDialog dialog = new AddFrameworkDialog(addFrameworkBtn.getShell()); if (Window.OK == dialog.open()) { IFrameworkInstall install = dialog.getInstall(); installs.add(install); frameworksViewer.add(install); if (installs.size() == 1) { frameworksViewer.setChecked(install, true); } else { // since there are two more frameworks available, we // enable the remove button removeFrameworkBtn.setEnabled(true); } } } }); editFrameworkBtn.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { IStructuredSelection iss = (IStructuredSelection) frameworksViewer.getSelection(); Object element = iss.getFirstElement(); AddFrameworkDialog dialog = new AddFrameworkDialog(addFrameworkBtn.getShell(), (FrameworkInstall) element); if (Window.OK == dialog.open()) { frameworksViewer.refresh(element, true); } } }); removeFrameworkBtn.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { IStructuredSelection iss = (IStructuredSelection) frameworksViewer.getSelection(); Object[] array = iss.toArray(); installs.removeAll(Arrays.asList(array)); frameworksViewer.remove(array); if (frameworksViewer.getTable().getItems().length == 1) { removeFrameworkBtn.setEnabled(false); } if (frameworksViewer.getCheckedElements().length == 0) { setErrorMessage(FrameworkMessages.FrameworksPreferencePage_SelectDefaultFrameworkError); setValid(false); } } }); } protected Control createContents(Composite parent) { // there are no "default" settings for this preference page noDefaultAndApplyButton(); Composite composite = new Composite(parent, SWT.NONE); composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); GridLayout layout = new GridLayout(2, false); layout.marginWidth = 0; layout.marginHeight = 0; composite.setLayout(layout); Label label = new Label(composite, SWT.LEAD); label.setText(FrameworkMessages.FrameworksPreferencePage_InstalledFrameworksLabel); label.setLayoutData(new GridData(SWT.BEGINNING, SWT.BEGINNING, true, false, 2, 1)); frameworksViewer = CheckboxTableViewer.newCheckList(composite, SWT.MULTI | SWT.FULL_SELECTION | SWT.BORDER); frameworksViewer.setContentProvider(new ArrayContentProvider()); frameworksViewer.setLabelProvider(new FrameworksLabelProvider()); Table frameworksTable = frameworksViewer.getTable(); frameworksTable.setLinesVisible(true); frameworksTable.setHeaderVisible(true); frameworksTable.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 3)); TableColumn column = new TableColumn(frameworksTable, SWT.LEAD); column.setText(FrameworkMessages.FrameworksPreferencePage_NameColumn); column.setWidth(100); column = new TableColumn(frameworksTable, SWT.LEAD); column.setText(FrameworkMessages.FrameworksPreferencePage_LocationColumn); column.setWidth(200); column = new TableColumn(frameworksTable, SWT.LEAD); column.setText(FrameworkMessages.FrameworksPreferencePage_TypeColumn); column.setWidth(100); frameworksViewer.setInput(installs); addFrameworkBtn = new Button(composite, SWT.PUSH); addFrameworkBtn.setLayoutData(new GridData(SWT.FILL, SWT.LEAD, true, false)); addFrameworkBtn.setText(FrameworkMessages.FrameworksPreferencePage_AddButton); editFrameworkBtn = new Button(composite, SWT.PUSH); editFrameworkBtn.setLayoutData(new GridData(SWT.FILL, SWT.LEAD, true, false)); editFrameworkBtn.setText(FrameworkMessages.FrameworksPreferencePage_EditButton); editFrameworkBtn.setEnabled(false); removeFrameworkBtn = new Button(composite, SWT.PUSH); removeFrameworkBtn.setLayoutData(new GridData(SWT.FILL, SWT.LEAD, true, false)); removeFrameworkBtn.setText(FrameworkMessages.FrameworksPreferencePage_RemoveButton); removeFrameworkBtn.setEnabled(false); addListeners(); String defaultFramework = preferences.get(IDotNetDebugConstants.DEFAULT_FRAMEWORK_INSTALL, null); for (int i = 0; i < installs.size(); i++) { IFrameworkInstall install = (IFrameworkInstall) installs.get(i); if (install.getId().equals(defaultFramework)) { frameworksViewer.setCheckedElements(new Object[] { install }); break; } } return composite; } public void init(IWorkbench workbench) { installs = new ArrayList(); preferences = new InstanceScope().getNode(EMonoPlugin.PLUGIN_ID); try { String[] keys = preferences.childrenNames(); for (int i = 0; i < keys.length; i++) { FrameworkInstall install = new FrameworkInstall(); install.setId(keys[i]); Preferences node = preferences.node(keys[i]); install.setName(node.get(IDotNetDebugConstants.FRAMEWORK_INSTALL_NAME, "")); //$NON-NLS-1$ install.setType(node.get(IDotNetDebugConstants.FRAMEWORK_INSTALL_TYPE, "")); //$NON-NLS-1$ install.setInstallLocation( new File(node.get(IDotNetDebugConstants.FRAMEWORK_INSTALL_LOCATION, ""))); //$NON-NLS-1$ install.setDocumentationLocation( node.get(IDotNetDebugConstants.FRAMEWORK_DOCUMENTATION_LOCATION, "")); //$NON-NLS-1$ install.setRuntimeArguments( node.get(IDotNetDebugConstants.FRAMEWORK_INSTALL_RUNTIME_ARGUMENTS, "")); //$NON-NLS-1$ install.setGACLocation(node.get(IDotNetDebugConstants.FRAMEWORK_GAC_LOCATION, "")); installs.add(install); } } catch (BackingStoreException e) { e.printStackTrace(); } } public boolean performOk() { if (super.performOk()) { preferences = new InstanceScope().getNode(EMonoPlugin.PLUGIN_ID); try { String[] children = preferences.childrenNames(); for (int i = 0; i < children.length; i++) { Preferences p = preferences.node(children[i]); p.removeNode(); } for (int i = 0; i < installs.size(); i++) { IFrameworkInstall install = (IFrameworkInstall) installs.get(i); Preferences node = preferences.node(install.getId()); node.put(IDotNetDebugConstants.FRAMEWORK_INSTALL_NAME, install.getName()); node.put(IDotNetDebugConstants.FRAMEWORK_INSTALL_TYPE, install.getType()); node.put(IDotNetDebugConstants.FRAMEWORK_INSTALL_LOCATION, install.getInstallLocation().getAbsolutePath()); node.put(IDotNetDebugConstants.FRAMEWORK_DOCUMENTATION_LOCATION, install.getDocumentationLocation()); node.put(IDotNetDebugConstants.FRAMEWORK_INSTALL_RUNTIME_ARGUMENTS, install.getRuntimeArguments()); node.put(IDotNetDebugConstants.FRAMEWORK_GAC_LOCATION, install.getGACLocation()); node.flush(); } Object[] elements = frameworksViewer.getCheckedElements(); if (elements.length != 0) { preferences.put(IDotNetDebugConstants.DEFAULT_FRAMEWORK_INSTALL, ((IFrameworkInstall) elements[0]).getId()); } preferences.flush(); } catch (BackingStoreException e) { e.printStackTrace(); } return true; } else { return false; } } }