Java tutorial
/******************************************************************************* * Copyright (c) 2014 Obeo. * 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: * Obeo - initial API and implementation *******************************************************************************/ package org.eclipse.emf.compare.rcp.ui.internal.preferences; import com.google.common.base.Function; import com.google.common.base.Joiner; import com.google.common.collect.ComparisonChain; import com.google.common.collect.Iterables; import com.google.common.collect.Lists; import com.google.common.collect.Sets; import com.google.common.collect.Sets.SetView; import java.util.Collections; import java.util.Comparator; import java.util.List; import org.eclipse.core.runtime.preferences.InstanceScope; import org.eclipse.emf.compare.internal.adapterfactory.RankedAdapterFactoryDescriptor; import org.eclipse.emf.compare.rcp.EMFCompareRCPPlugin; import org.eclipse.emf.compare.rcp.internal.preferences.EMFComparePreferences; import org.eclipse.emf.compare.rcp.ui.internal.EMFCompareRCPUIMessages; 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.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.TableItem; import org.eclipse.ui.IWorkbench; import org.eclipse.ui.IWorkbenchPreferencePage; import org.eclipse.ui.preferences.ScopedPreferenceStore; /** * Preferences page used to enable/disable adapter factories that have been contributed to EMF Compare. * * @author <a href="mailto:arthur.daussy@obeo.fr">Arthur Daussy</a> */ public class AdapterFactoriesPreferencePage extends PreferencePage implements IWorkbenchPreferencePage { /** Height hint for the description label. */ private static final int DESCRIPTION_LABEL_HEIGHT_HINT = 50; /** Width hint for configuration composite. */ private static final int DESCRIPTION_LABEL_WIDTH_HINT = 400; private CheckboxTableViewer adapterFactoryDescriptorViewer; public void init(IWorkbench workbench) { // Do not use InstanceScope.Instance to be compatible with Helios. @SuppressWarnings("deprecation") ScopedPreferenceStore store = new ScopedPreferenceStore(new InstanceScope(), EMFCompareRCPPlugin.PLUGIN_ID); setPreferenceStore(store); } @Override protected Control createContents(Composite parent) { Composite containerComposite = new Composite(parent, SWT.NONE); containerComposite.setLayout(new GridLayout(1, false)); containerComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1)); createViewer(containerComposite); createDescriptionText(parent); fillViewer(); return containerComposite; } private void fillViewer() { List<RankedAdapterFactoryDescriptor> descriptors = Lists .newArrayList(EMFCompareRCPPlugin.getDefault().getAdapterFactoryRegistry().getDescriptors()); Collections.sort(descriptors, new Comparator<RankedAdapterFactoryDescriptor>() { public int compare(RankedAdapterFactoryDescriptor o1, RankedAdapterFactoryDescriptor o2) { return ComparisonChain.start().compare(o1.getId(), o2.getId()).result(); } }); adapterFactoryDescriptorViewer.setInput(descriptors); List<String> disabledDescriptors = EMFComparePreferences.getDisabledAdapterFacotryDescriptorIds( EMFCompareRCPPlugin.getDefault().getEMFComparePreferences()); initViewer(disabledDescriptors); } private void createDescriptionText(Composite parent) { Group descriptionComposite = new Group(parent, SWT.NONE); descriptionComposite .setText(EMFCompareRCPUIMessages.getString("AdapterFactoryPreferencePage.descriptionGroup.text")); //$NON-NLS-1$ descriptionComposite.setLayout(new GridLayout(1, false)); descriptionComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1)); final Label engineDescriptionLabel = new Label(descriptionComposite, SWT.WRAP); engineDescriptionLabel.setBackground(Display.getCurrent().getSystemColor(SWT.COLOR_WIDGET_BACKGROUND)); GridData layoutData = new GridData(SWT.FILL, SWT.FILL, true, false, 2, 1); layoutData.heightHint = DESCRIPTION_LABEL_HEIGHT_HINT; layoutData.widthHint = DESCRIPTION_LABEL_WIDTH_HINT; engineDescriptionLabel.setLayoutData(layoutData); // Updates description text with selection adapterFactoryDescriptorViewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { if (adapterFactoryDescriptorViewer.equals(event.getSource())) { ISelection selection = event.getSelection(); if (selection instanceof IStructuredSelection) { IStructuredSelection structSelection = (IStructuredSelection) selection; Object first = structSelection.getFirstElement(); if (first instanceof RankedAdapterFactoryDescriptor) { String description = ((RankedAdapterFactoryDescriptor) first).getDescription(); if (description != null) { engineDescriptionLabel.setText(description); } else { engineDescriptionLabel.setText(""); //$NON-NLS-1$ } } } } } }); } private void createViewer(Composite containerComposite) { Group interactiveGroup = new Group(containerComposite, SWT.BORDER); interactiveGroup .setText(EMFCompareRCPUIMessages.getString("AdapterFactoryPreferencePage.itemProviderGroup.text")); //$NON-NLS-1$ interactiveGroup.setLayout(new GridLayout(1, false)); interactiveGroup.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1)); adapterFactoryDescriptorViewer = CheckboxTableViewer.newCheckList(interactiveGroup, SWT.BORDER | SWT.V_SCROLL | SWT.FULL_SELECTION); adapterFactoryDescriptorViewer.setContentProvider(ArrayContentProvider.getInstance()); adapterFactoryDescriptorViewer.setLabelProvider(new LabelProvider() { @Override public String getText(Object element) { if (element instanceof RankedAdapterFactoryDescriptor) { return ((RankedAdapterFactoryDescriptor) element).getLabel(); } return super.getText(element); } }); GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1); adapterFactoryDescriptorViewer.getControl().setLayoutData(gd); // Prevents unselecting non optional providers adapterFactoryDescriptorViewer.addCheckStateListener(new ICheckStateListener() { public void checkStateChanged(CheckStateChangedEvent event) { Object element = event.getElement(); if (element instanceof RankedAdapterFactoryDescriptor) { RankedAdapterFactoryDescriptor provider = (RankedAdapterFactoryDescriptor) element; if (!provider.isOptional()) { event.getCheckable().setChecked(element, true); } } } }); } private void initViewer(List<String> disabledDescriptors) { for (TableItem item : adapterFactoryDescriptorViewer.getTable().getItems()) { RankedAdapterFactoryDescriptor descriptor = (RankedAdapterFactoryDescriptor) item.getData(); if (!descriptor.isOptional()) { item.setForeground(item.getDisplay().getSystemColor(SWT.COLOR_GRAY)); item.setChecked(true); } else { item.setChecked(!disabledDescriptors.contains(descriptor.getId())); } } } @Override protected void performDefaults() { initViewer(Collections.<String>emptyList()); super.performDefaults(); } @Override public boolean performOk() { Object[] checkedDescriptors = adapterFactoryDescriptorViewer.getCheckedElements(); SetView<RankedAdapterFactoryDescriptor> descriptorsToDisable = Sets.difference( Sets.newHashSet(EMFCompareRCPPlugin.getDefault().getAdapterFactoryRegistry().getDescriptors()), Sets.newHashSet(checkedDescriptors)); Iterable<String> descriptorsToDisableIds = Iterables.transform( Iterables.filter(descriptorsToDisable, RankedAdapterFactoryDescriptor.class), new Function<Object, String>() { public String apply(Object input) { return ((RankedAdapterFactoryDescriptor) input).getId(); } }); getPreferenceStore().putValue(EMFComparePreferences.DISABLED_ADAPTER_FACTORY, Joiner.on(';').join(descriptorsToDisableIds)); return super.performOk(); } }