Java tutorial
/* * Copyright 2008-2011 Amazon Technologies, Inc. * * 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://aws.amazon.com/apache2.0 * * This file 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 com.amazonaws.eclipse.ec2.ui; import java.util.LinkedList; import java.util.List; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; 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.Display; import org.eclipse.swt.widgets.Group; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Link; import org.eclipse.swt.widgets.Text; import com.amazonaws.eclipse.core.ui.WebLinkListener; import com.amazonaws.eclipse.ec2.ShellCommandException; import com.amazonaws.eclipse.ec2.ShellCommandResults; /** * Dialog for showing the details of a failed attempt at executing a command, * including support for possible retries, and directing users to more help. */ public class ShellCommandErrorDialog extends MessageDialog { private final ShellCommandException sce; private Text outputText; private Text errorOutputText; private List<Button> attemptRadioButtons = new LinkedList<Button>(); /** * Creates a new ShellCommandErrorDialog, ready to be opened and display * information the specified ShellCommandException. * * @param sce * The ShellCommandException to display. */ public ShellCommandErrorDialog(ShellCommandException sce) { super(Display.getDefault().getShells()[0], "Error Executing Command", null, sce.getMessage(), MessageDialog.ERROR, new String[] { "Ok" }, 1); this.sce = sce; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.MessageDialog#createCustomArea(org.eclipse.swt.widgets.Composite) */ @Override protected Control createCustomArea(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); composite.setLayoutData(new GridData(GridData.FILL_BOTH)); composite.setLayout(new GridLayout(1, false)); if (sce.getNumberOfAttempts() > 1) { createAttemptSelectionArea(composite); attemptRadioButtons.get(0).setSelection(true); } createCommandOutputArea(composite); createHelpLinkArea(composite); update(); return composite; } /* * Private Interface */ /** * Creates a new UI section displaying a link where users can go for more * help. * * @param composite * The parent composite for this new section. */ private void createHelpLinkArea(Composite composite) { Link link = new Link(composite, SWT.WRAP); link.setText( "Need help? " + "<a href=\"http://aws.amazon.com/eclipse/\">http://aws.amazon.com/eclipse/</a>"); WebLinkListener webLinkListener = new WebLinkListener(); link.addListener(SWT.Selection, webLinkListener); } /** * Creates a new UI section displaying the details of the selected attempt * to execute a command. * * @param composite * The parent composite for this new section. */ private void createCommandOutputArea(Composite composite) { Composite outputComposite = new Composite(composite, SWT.NONE); outputComposite.setLayout(new GridLayout(1, false)); outputComposite.setLayoutData(new GridData(GridData.FILL_BOTH)); Group outputGroup = new Group(outputComposite, SWT.None); outputGroup.setLayoutData(new GridData(GridData.FILL_BOTH)); outputGroup.setLayout(new GridLayout(2, false)); outputGroup.setText("Command Output:"); newLabel(outputGroup, "Output:"); outputText = newText(outputGroup, ""); newLabel(outputGroup, "Errors:"); errorOutputText = newText(outputGroup, ""); } /** * Creates a new UI section displaying a list of attempts that a user can * select to see more information. * * @param composite * The parent composite for this new section. */ private void createAttemptSelectionArea(Composite composite) { Composite attemptsComposite = new Composite(composite, SWT.NONE); attemptsComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); attemptsComposite.setLayout(new GridLayout(1, true)); Group attemptsGroup = new Group(attemptsComposite, SWT.None); attemptsGroup.setLayoutData(new GridData(GridData.FILL_BOTH)); attemptsGroup.setLayout(new GridLayout(1, false)); Label l = new Label(attemptsGroup, SWT.WRAP); l.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); l.setText("Select an attempt to see the output from it:"); SelectionListener listener = new SelectionListener() { public void widgetDefaultSelected(SelectionEvent e) { } public void widgetSelected(SelectionEvent e) { update(); } }; attemptRadioButtons = new LinkedList<Button>(); for (ShellCommandResults results : sce.getShellCommandResults()) { Button button = new Button(attemptsGroup, SWT.RADIO); button.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); attemptRadioButtons.add(button); button.addSelectionListener(listener); button.setText("Attempt " + attemptRadioButtons.size() + " (exit code: " + results.exitCode + ")"); button.setData(results); } } /** * Returns the ShellCommandResults associated with the selected command * execution attempt. * * @return The ShellCommandResults associated with the selected attempt. */ private ShellCommandResults getSelectedAttempt() { for (Button button : attemptRadioButtons) { if (button.getSelection()) { return (ShellCommandResults) button.getData(); } } return sce.getShellCommandResults().get(0); } /** * Updates the command output section so that the correct output is * displayed based on what command execution attempt is selected. */ private void update() { ShellCommandResults results = getSelectedAttempt(); outputText.setText(results.output); errorOutputText.setText(results.errorOutput); } /** * Utility method for creating a Text widget. */ private Text newText(Composite composite, String s) { Text text = new Text(composite, SWT.READ_ONLY | SWT.BORDER | SWT.MULTI | SWT.V_SCROLL | SWT.H_SCROLL); text.setText(s); GridData data = new GridData(GridData.FILL_BOTH); data.minimumHeight = 80; data.heightHint = 100; data.minimumWidth = 100; data.widthHint = 250; text.setLayoutData(data); return text; } /** * Utility method for creating a Label widget. */ private Label newLabel(Composite outputComposite, String text) { Label label = new Label(outputComposite, SWT.NONE); label.setText(text); GridData data = new GridData(); data.verticalAlignment = SWT.TOP; label.setLayoutData(data); return label; } }