Java tutorial
/***************************************************************** * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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 org.apache.cayenne.modeler.dialog; import java.awt.BorderLayout; import java.awt.Container; import java.awt.HeadlessException; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.io.IOException; import java.io.PrintWriter; import java.io.StringWriter; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JEditorPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.ScrollPaneConstants; import org.apache.cayenne.modeler.Application; import org.apache.cayenne.modeler.CayenneModelerFrame; import org.apache.cayenne.modeler.util.CayenneDialog; import org.apache.cayenne.modeler.util.ModelerUtil; import org.apache.cayenne.modeler.util.PanelFactory; import org.apache.cayenne.util.LocalizedStringsHandler; import org.apache.cayenne.util.Util; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Displays CayenneModeler exceptions and warning messages. * */ public class ErrorDebugDialog extends CayenneDialog implements ActionListener { private static Log logObj = LogFactory.getLog(ErrorDebugDialog.class); /** * Sole instance of error/warning dialog to disallow showing of multiple dialogs */ private static ErrorDebugDialog instance; protected JButton close; protected JButton showHide; protected JTextArea exText = new JTextArea(); protected JPanel exPanel; protected Throwable throwable; protected boolean detailed; /** * Shows an error dialog with stack trace */ public static void guiException(Throwable th) { if (th != null) { logObj.error("CayenneModeler Error", th); } ErrorDebugDialog dialog = new ErrorDebugDialog(Application.getFrame(), "CayenneModeler Error", th, true, false); showDialog(dialog); } /** * Shows an warning dialog with stack trace */ public static void guiWarning(Throwable th, String message) { if (th != null) { logObj.warn("CayenneModeler Warning", th); } WarningDialog dialog = new WarningDialog(Application.getFrame(), message, th, false, false); showDialog(dialog); } /** * Shows an error/warning dialog, closing existing if needed */ private static void showDialog(ErrorDebugDialog dialog) { if (instance != null) { instance.dispose(); } instance = dialog; dialog.setVisible(true); } /** * Constructor for ErrorDebugDialog. */ protected ErrorDebugDialog(CayenneModelerFrame owner, String title, Throwable throwable, boolean detailed) throws HeadlessException { this(owner, title, throwable, detailed, true); } /** * Constructor for ErrorDebugDialog, allowing to specify 'modal' property */ protected ErrorDebugDialog(CayenneModelerFrame owner, String title, Throwable throwable, boolean detailed, boolean modal) throws HeadlessException { super(owner, title, modal); setThrowable(Util.unwindException(throwable)); setDetailed(detailed); init(); } protected void init() { setResizable(false); Container pane = this.getContentPane(); pane.setLayout(new BorderLayout()); // info area JEditorPane infoText = new JEditorPane("text/html", infoHTML()); infoText.setBackground(pane.getBackground()); infoText.setEditable(false); // popup hyperlinks infoText.addHyperlinkListener(this); JPanel infoPanel = new JPanel(); infoPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); infoPanel.add(infoText); pane.add(infoPanel, BorderLayout.NORTH); // exception area if (throwable != null) { exText.setEditable(false); exText.setLineWrap(true); exText.setWrapStyleWord(true); exText.setRows(16); exText.setColumns(40); JScrollPane exScroll = new JScrollPane(exText, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED); exPanel = new JPanel(); exPanel.setLayout(new BorderLayout()); exPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); exPanel.add(exScroll, BorderLayout.CENTER); // buttons showHide = new JButton(""); showHide.addActionListener(this); if (isDetailed()) { showDetails(); } else { hideDetails(); } } close = new JButton("Close"); close.addActionListener(this); JButton[] buttons = (showHide != null) ? new JButton[] { showHide, close } : new JButton[] { close }; pane.add(PanelFactory.createButtonPanel(buttons), BorderLayout.SOUTH); //add a listener to clear static variables, not to produce garbage addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { instance = null; } }); // prepare to display this.pack(); this.centerWindow(); } protected String infoHTML() { String bugreportURL = ModelerUtil.getProperty("cayenne.bugreport.url"); return "<b><font face='Arial,Helvetica' size='+1' color='red'>" + getTitle() + "</font></b><br>" + "<font face='Arial,Helvetica' size='-1'>Please copy the message below and " + "report this error by going to <br>" + "<a href='" + bugreportURL + "'>" + bugreportURL + "</a></font>"; } protected void setThrowable(Throwable throwable) { this.throwable = throwable; String text = null; if (throwable != null) { StringWriter str = new StringWriter(); PrintWriter out = new PrintWriter(str); // first add extra diagnostics String version = LocalizedStringsHandler.getString("cayenne.version"); version = (version != null) ? version : "(unknown)"; String buildDate = LocalizedStringsHandler.getString("cayenne.build.date"); buildDate = (buildDate != null) ? buildDate : "(unknown)"; out.println("CayenneModeler Info"); out.println("Version: " + version); out.println("Build Date: " + buildDate); out.println("Exception: "); out.println("================================="); buildStackTrace(out, throwable); try { out.close(); str.close(); } catch (IOException ioex) { // this should never happen } text = str.getBuffer().toString(); } exText.setText(text); } protected void buildStackTrace(PrintWriter out, Throwable th) { if (th == null) { return; } th.printStackTrace(out); Throwable cause = th.getCause(); if (cause != null) { out.println("Caused by:"); buildStackTrace(out, cause); } } public void actionPerformed(ActionEvent e) { if (e.getSource() == close) { this.dispose(); } else if (e.getSource() == showHide) { if (isDetailed()) { hideDetails(); } else { showDetails(); } this.pack(); this.centerWindow(); } } protected void hideDetails() { getContentPane().remove(exPanel); showHide.setText("Show Details"); setDetailed(false); } protected void showDetails() { getContentPane().add(exPanel, BorderLayout.CENTER); showHide.setText("Hide Details"); setDetailed(true); } /** * Returns the detailed. * @return boolean */ public boolean isDetailed() { return detailed; } /** * Sets the detailed. * @param detailed The detailed to set */ public void setDetailed(boolean detailed) { this.detailed = detailed; } }