Java tutorial
/******************************************************************************* * Copyright 2013 Geoscience Australia * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. ******************************************************************************/ package au.gov.ga.earthsci.discovery.ui.preferences; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogConstants; import org.eclipse.jface.dialogs.StatusDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DropTarget; import org.eclipse.swt.dnd.FileTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.dnd.URLTransfer; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Combo; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import au.gov.ga.earthsci.common.ui.util.TextURLDropAdapter; import au.gov.ga.earthsci.discovery.DiscoveryProviderRegistry; import au.gov.ga.earthsci.discovery.IDiscoveryProvider; import au.gov.ga.earthsci.discovery.IDiscoveryService; import au.gov.ga.earthsci.discovery.IDiscoveryServiceProperty; import au.gov.ga.earthsci.discovery.ui.Messages; /** * Dialog used to edit/create discovery services. * * @author Michael de Hoog (michael.dehoog@ga.gov.au) */ public class EditDiscoveryServiceDialog extends StatusDialog { private IDiscoveryService service = null; private IDiscoveryService originalService = null; private Button okButton; private Combo typeCombo; private Text nameText; private Text urlText; private List<IDiscoveryProvider> providers; private Label[] propertyLabels; private Control[] propertyControls; public EditDiscoveryServiceDialog(Shell parent) { super(parent); } public IDiscoveryService getService() { return service; } public void setService(IDiscoveryService service) { this.service = service; this.originalService = service; } @Override protected void createButtonsForButtonBar(Composite parent) { okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true); createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false); validate(); } @Override protected Control createDialogArea(Composite parent) { Composite comp = new Composite(parent, SWT.NONE); initializeDialogUnits(comp); GridLayout layout = new GridLayout(); layout.numColumns = 2; layout.marginTop = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); createTypeCombo(comp); createNameField(comp); createLocationField(comp); createProviderPropertyControls(comp, false); comp.setLayout(layout); GridData data = new GridData(); comp.setLayoutData(data); Dialog.applyDialogFont(comp); return comp; } protected void createTypeCombo(final Composite parent) { providers = new ArrayList<IDiscoveryProvider>(DiscoveryProviderRegistry.getProviders()); Collections.sort(providers, new DiscoveryProviderComparator()); String[] items = new String[providers.size()]; int selectedIndex = -1; for (int i = 0; i < providers.size(); i++) { IDiscoveryProvider provider = providers.get(i); items[i] = provider.getName() != null ? provider.getName() : ""; //$NON-NLS-1$ if (service != null && service.getProvider() == provider) { selectedIndex = i; } } Label typeLabel = new Label(parent, SWT.NONE); typeLabel.setText(Messages.EditDiscoveryServiceDialog_TypeLabel); typeCombo = new Combo(parent, SWT.DROP_DOWN | SWT.READ_ONLY); typeCombo.setItems(items); typeCombo.select(selectedIndex); GridData data = new GridData(GridData.FILL_HORIZONTAL); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH); typeCombo.setLayoutData(data); typeCombo.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { createProviderPropertyControls(parent, true); validate(); } }); } protected void createNameField(Composite parent) { Label nameLabel = new Label(parent, SWT.NONE); nameLabel.setText(Messages.EditDiscoveryServiceDialog_NameLabel); nameText = new Text(parent, SWT.BORDER); String name = service == null ? null : service.getName(); nameText.setText(name != null ? name : ""); //$NON-NLS-1$ GridData data = new GridData(GridData.FILL_HORIZONTAL); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH); nameText.setLayoutData(data); nameText.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { validate(); } }); } protected void createLocationField(Composite parent) { Label urlLabel = new Label(parent, SWT.NONE); urlLabel.setText(Messages.EditDiscoveryServiceDialog_LocationLabel); urlText = new Text(parent, SWT.BORDER); GridData data = new GridData(GridData.FILL_HORIZONTAL); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH); urlText.setLayoutData(data); DropTarget target = new DropTarget(urlText, DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_LINK); target.setTransfer(new Transfer[] { URLTransfer.getInstance(), FileTransfer.getInstance() }); target.addDropListener(new TextURLDropAdapter(urlText, true)); URL url = service == null ? null : service.getServiceURL(); urlText.setText(url != null ? url.toString() : ""); //$NON-NLS-1$ urlText.setSelection(0, urlText.getText().length()); urlText.addModifyListener(new ModifyListener() { @Override public void modifyText(ModifyEvent e) { validate(); } }); } protected void createProviderPropertyControls(Composite parent, boolean packShell) { if (propertyControls != null) { for (Control control : propertyControls) { if (control != null) { control.dispose(); } } for (Label label : propertyLabels) { if (label != null) { label.dispose(); } } } IDiscoveryProvider provider = null; int selectedIndex = typeCombo.getSelectionIndex(); if (selectedIndex >= 0) { provider = providers.get(selectedIndex); } @SuppressWarnings("unchecked") IDiscoveryServiceProperty<Object>[] properties = provider == null ? null : (IDiscoveryServiceProperty<Object>[]) provider.getProperties(); if (properties == null) { propertyControls = new Control[0]; propertyLabels = new Label[0]; } else { propertyControls = new Control[properties.length]; propertyLabels = new Label[properties.length]; for (int i = 0; i < properties.length; i++) { IDiscoveryServiceProperty<Object> property = properties[i]; String label = property.getLabel(); label = label != null ? label + ":" : ""; //$NON-NLS-1$ //$NON-NLS-2$ propertyLabels[i] = new Label(parent, SWT.NONE); propertyLabels[i].setText(label); Object value = null; if (originalService != null && originalService.getProvider() == provider) { value = property.getValue(originalService); } else if (service != null && service.getProvider() == provider) { value = property.getValue(service); } propertyControls[i] = property.createControl(parent, value, new ModifyListener() { @Override public void modifyText(ModifyEvent e) { validate(); } }); GridData data = new GridData(GridData.FILL_HORIZONTAL); data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.ENTRY_FIELD_WIDTH); propertyControls[i].setLayoutData(data); } } parent.pack(); if (packShell) { getShell().pack(); } } protected void validate() { service = null; IDiscoveryProvider provider = null; int selectedIndex = typeCombo.getSelectionIndex(); if (selectedIndex >= 0) { provider = providers.get(selectedIndex); } String name = nameText.getText(); URL url; try { url = new URL(urlText.getText()); } catch (MalformedURLException e) { url = null; } if (provider != null) { IDiscoveryServiceProperty<?>[] properties = provider.getProperties(); boolean valid = name != null && url != null; if (valid) { if (properties != null) { for (int i = 0; i < properties.length && valid; i++) { IDiscoveryServiceProperty<?> property = properties[i]; valid &= property.validate(propertyControls[i]); } } } if (valid) { Map<IDiscoveryServiceProperty<?>, Object> propertyValues = new HashMap<IDiscoveryServiceProperty<?>, Object>(); if (properties != null) { for (int i = 0; i < properties.length && valid; i++) { IDiscoveryServiceProperty<?> property = properties[i]; Object value = property.getValue(propertyControls[i]); propertyValues.put(property, value); } } service = provider.createService(name, url, propertyValues); } } okButton.setEnabled(service != null); } }