Java tutorial
/* * Conditions Of Use * * This software was developed by employees of the National Institute of * Standards and Technology (NIST), and others. * This software has been contributed to the public domain. * Pursuant to title 15 Untied States Code Section 105, works of NIST * employees are not subject to copyright protection in the United States * and are considered to be in the public domain. * As a result, a formal license is not needed to use this software. * * This software is provided "AS IS." * NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED * OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT * AND DATA ACCURACY. NIST does not warrant or make any representations * regarding the use of the software or the results thereof, including but * not limited to the correctness, accuracy, reliability or usefulness of * this software. */ package gov.nist.spectrumbrowser.admin; import gov.nist.spectrumbrowser.common.Defines; import gov.nist.spectrumbrowser.common.SpectrumBrowserCallback; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.logical.shared.ValueChangeEvent; import com.google.gwt.event.logical.shared.ValueChangeHandler; import com.google.gwt.json.client.JSONArray; import com.google.gwt.json.client.JSONObject; import com.google.gwt.json.client.JSONParser; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.CheckBox; import com.google.gwt.user.client.ui.Grid; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HTMLTable.CellFormatter; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HasVerticalAlignment; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.VerticalPanel; public class SweptFrequencySensorBands { private VerticalPanel verticalPanel; private Sensor sensor; private SensorConfig sensorConfig; private Admin admin; public SweptFrequencySensorBands(Admin admin, SensorConfig sensorConfig, Sensor sensor, VerticalPanel verticalPanel) { this.verticalPanel = verticalPanel; this.sensor = sensor; this.sensorConfig = sensorConfig; this.admin = admin; } class DeleteThresholdClickHandler implements ClickHandler { SweptFrequencyBand threshold; DeleteThresholdClickHandler(SweptFrequencyBand threshold) { this.threshold = threshold; } @Override public void onClick(ClickEvent event) { sensor.deleteThreshold(threshold); Admin.getAdminService().updateSensor(sensor.toString(), sensorConfig); draw(); } } public void draw() { verticalPanel.clear(); HTML html = new HTML("<H2>Bands for sensor : " + sensor.getSensorId() + "</H2>"); verticalPanel.add(html); JSONObject sensorThresholds = sensor.getThresholds(); Grid grid = new Grid(sensorThresholds.keySet().size() + 1, 8); grid.setBorderWidth(2); grid.setCellPadding(2); grid.setCellSpacing(2); grid.setText(0, 0, "System To Detect"); grid.setText(0, 1, "Min Freq (Hz)"); grid.setText(0, 2, "Max Freq (Hz)"); grid.setText(0, 3, "Channel Count"); grid.setText(0, 4, "Occupancy Threshold (dBm/Hz)"); grid.setText(0, 5, "Occupancy Threshold (dBm)"); grid.setText(0, 6, "Enabled?"); grid.setText(0, 7, "Delete Band"); grid.setBorderWidth(2); grid.setCellPadding(2); grid.setCellSpacing(2); CellFormatter formatter = grid.getCellFormatter(); for (int i = 0; i < grid.getRowCount(); i++) { for (int j = 0; j < grid.getColumnCount(); j++) { formatter.setHorizontalAlignment(i, j, HasHorizontalAlignment.ALIGN_CENTER); formatter.setVerticalAlignment(i, j, HasVerticalAlignment.ALIGN_MIDDLE); } } for (int i = 0; i < grid.getColumnCount(); i++) { grid.getCellFormatter().setStyleName(0, i, "textLabelStyle"); } int row = 1; for (String key : sensorThresholds.keySet()) { final SweptFrequencyBand threshold = new SweptFrequencyBand(sensorThresholds.get(key).isObject()); grid.setText(row, 0, threshold.getSystemToDetect()); grid.setText(row, 1, Long.toString(threshold.getMinFreqHz())); grid.setText(row, 2, Long.toString(threshold.getMaxFreqHz())); final TextBox channelCountTextBox = new TextBox(); channelCountTextBox.setText(Long.toString(threshold.getChannelCount())); channelCountTextBox.addValueChangeHandler(new ValueChangeHandler<String>() { @Override public void onValueChange(ValueChangeEvent<String> event) { Long oldValue = Long.parseLong(channelCountTextBox.getValue()); try { long newValue = Long.parseLong(event.getValue()); threshold.setChannelCount((long) newValue); } catch (Exception ex) { Window.alert(ex.getMessage()); channelCountTextBox.setValue(Double.toString(oldValue)); } } }); grid.setWidget(row, 3, channelCountTextBox); final Label thresholdLabel = new Label(); final TextBox thresholdTextBox = new TextBox(); thresholdTextBox.setText(Double.toString(threshold.getThresholdDbmPerHz())); thresholdTextBox.addValueChangeHandler(new ValueChangeHandler<String>() { @Override public void onValueChange(ValueChangeEvent<String> event) { Double oldThreshold = Double.parseDouble(thresholdTextBox.getValue()); try { double newThreshold = Double.parseDouble(event.getValue()); threshold.setThresholdDbmPerHz(newThreshold); thresholdLabel.setText(Float.toString(threshold.getThresholdDbm())); } catch (Exception ex) { Window.alert(ex.getMessage()); thresholdTextBox.setValue(Double.toString(oldThreshold)); } } }); grid.setWidget(row, 4, thresholdTextBox); thresholdLabel.setText(Float.toString(threshold.getThresholdDbm())); grid.setWidget(row, 5, thresholdLabel); CheckBox activeCheckBox = new CheckBox(); grid.setWidget(row, 6, activeCheckBox); activeCheckBox.setValue(threshold.isActive()); activeCheckBox.addValueChangeHandler(new ValueChangeHandler<Boolean>() { @Override public void onValueChange(ValueChangeEvent<Boolean> event) { if (event.getValue()) { for (String key : sensor.getThresholds().keySet()) { SweptFrequencyBand th = new SweptFrequencyBand(sensor.getThreshold(key)); th.setActive(false); } } threshold.setActive(event.getValue()); draw(); } }); Button deleteButton = new Button("Delete Band"); deleteButton.addClickHandler(new DeleteThresholdClickHandler(threshold)); grid.setWidget(row, 7, deleteButton); row++; } verticalPanel.add(grid); HorizontalPanel horizontalPanel = new HorizontalPanel(); Button addButton = new Button("Add Band"); addButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { new AddSweptFrequencySensorBand(admin, SweptFrequencySensorBands.this, sensorConfig, sensor, verticalPanel).draw(); } }); horizontalPanel.add(addButton); Button recomputeButton = new Button("Recompute Occupancies"); recomputeButton.setTitle("Recomputes per message summary occupancies."); recomputeButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { boolean yes = Window.confirm( "Ensure no users are using the system. Update sensor before proceeding. This can take a long time. Proceed?"); if (yes) { final HTML html = new HTML( "<h3>Recomputing thresholds - this can take a while. Please wait. </h3>"); verticalPanel.add(html); Admin.getAdminService().recomputeOccupancies(sensor.getSensorId(), new SpectrumBrowserCallback<String>() { @Override public void onSuccess(String result) { verticalPanel.remove(html); } @Override public void onFailure(Throwable throwable) { Window.alert("Error communicating with server"); admin.logoff(); } }); } } }); horizontalPanel.add(recomputeButton); Button doneButton = new Button("Done"); doneButton.setTitle("Return to sensors screen"); doneButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { sensorConfig.redraw(); } }); horizontalPanel.add(doneButton); Button updateButton = new Button("Update"); updateButton.setTitle("Update sensor on server"); updateButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { Admin.getAdminService().updateSensor(sensor.toString(), sensorConfig); } }); horizontalPanel.add(updateButton); Button logoffButton = new Button("Log Off"); logoffButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { admin.logoff(); } }); horizontalPanel.add(logoffButton); verticalPanel.add(horizontalPanel); } }