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.csw; import java.net.URL; import java.util.List; 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.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.Shell; import au.gov.ga.earthsci.worldwind.common.util.URLUtil; /** * Dialog used to select a URL to open from a CSW discovery result. * * @author Michael de Hoog (michael.dehoog@ga.gov.au) */ public class CSWURLSelectionDialog extends StatusDialog { private final List<URL> urls; private URL selectedUrl; private URL finalUrl; private Button okButton; private Button getCapabilitiesButton; private org.eclipse.swt.widgets.List urlList; private Label finalUrlLabel; public CSWURLSelectionDialog(Shell parent, List<URL> urls) { super(parent); this.urls = urls; } public URL getSelectedUrl() { return selectedUrl; } public void setSelectedUrl(URL selectedUrl) { this.selectedUrl = selectedUrl; } public URL getFinalUrl() { return finalUrl; } @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 void setShellStyle(int newShellStyle) { super.setShellStyle(newShellStyle | SWT.RESIZE); } @Override protected Control createDialogArea(Composite parent) { Composite comp = new Composite(parent, SWT.NONE); comp.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); initializeDialogUnits(comp); GridLayout layout = new GridLayout(); layout.marginTop = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING); urlList = new org.eclipse.swt.widgets.List(comp, SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL); urlList.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); int maxCountOfWms = 0; int selectedIndex = -1; for (int i = 0; i < urls.size(); i++) { URL url = urls.get(i); String urlString = url.toString(); urlList.add(urlString); int countOfWms = countStringOccurences(urlString.toLowerCase(), "wms"); //$NON-NLS-1$ if (countOfWms > maxCountOfWms) { maxCountOfWms = countOfWms; selectedIndex = i; } } if (selectedIndex < 0 && !urls.isEmpty()) { selectedIndex = 0; } if (selectedUrl != null) { int indexOfSelectedUrl = urls.indexOf(selectedUrl); selectedIndex = indexOfSelectedUrl >= 0 ? indexOfSelectedUrl : selectedIndex; } if (selectedIndex >= 0) { urlList.select(selectedIndex); } urlList.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { validate(); } }); getCapabilitiesButton = new Button(comp, SWT.CHECK); getCapabilitiesButton.setText(Messages.CSWURLSelectionDialog_GetCapabilitiesButtonText); getCapabilitiesButton.setSelection(true); getCapabilitiesButton.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { validate(); } }); finalUrlLabel = new Label(comp, SWT.NONE); finalUrlLabel.setLayoutData(new GridData(SWT.FILL, SWT.NONE, true, false)); comp.setLayout(layout); Dialog.applyDialogFont(comp); return comp; } private void validate() { int selectedIndex = urlList.getSelectionIndex(); URL oldSelectedUrl = selectedUrl; selectedUrl = selectedIndex < 0 ? null : urls.get(selectedIndex); if (oldSelectedUrl != selectedUrl) { updateGetCapabilitiesButton(); } updateFinalUrl(); finalUrlLabel.setText(finalUrl == null ? "" : finalUrl.toString().replace("&", "&&")); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ boolean valid = selectedUrl != null; okButton.setEnabled(valid); } private void updateGetCapabilitiesButton() { if (selectedUrl == null) { return; } String lower = selectedUrl.toString().toLowerCase(); if (lower.contains("request=getcapabilities")) //$NON-NLS-1$ { getCapabilitiesButton.setSelection(true); getCapabilitiesButton.setEnabled(false); } else { getCapabilitiesButton.setEnabled(true); boolean containsOGC = lower.contains("wms") || lower.contains("wcs") || lower.contains("wfs"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ getCapabilitiesButton.setSelection(containsOGC); } } private void updateFinalUrl() { if (selectedUrl == null) { finalUrl = null; return; } else if (!getCapabilitiesButton.getSelection() || !getCapabilitiesButton.isEnabled()) { finalUrl = selectedUrl; return; } String urlString = selectedUrl.toString(); String lower = urlString.toLowerCase(); if (lower.contains("wms")) //$NON-NLS-1$ { urlString = URLUtil.addQueryParameter(urlString, "service=WMS"); //$NON-NLS-1$ } else if (lower.contains("wfs")) //$NON-NLS-1$ { urlString = URLUtil.addQueryParameter(urlString, "service=WFS"); //$NON-NLS-1$ } else if (lower.contains("wcs")) //$NON-NLS-1$ { urlString = URLUtil.addQueryParameter(urlString, "service=WCS"); //$NON-NLS-1$ } urlString = URLUtil.addQueryParameter(urlString, "request=GetCapabilities"); //$NON-NLS-1$ try { finalUrl = new URL(urlString); } catch (Exception e) { e.printStackTrace(); finalUrl = selectedUrl; } } private static int countStringOccurences(String string, String substring) { int count = 0; int start = 0; int length = substring.length(); while ((start = string.indexOf(substring, start) + length) >= length) { count++; } return count; } }