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src/main/java/com/nccgroup/loggerplusplus/logging/JTextAreaAppender.java
| 1 | | - | package com.nccgroup.loggerplusplus.logging; |
| 2 | | - | |
| 3 | | - | import org.apache.logging.log4j.core.*; |
| 4 | | - | import org.apache.logging.log4j.core.appender.AbstractAppender; |
| 5 | | - | import org.apache.logging.log4j.core.config.plugins.Plugin; |
| 6 | | - | import org.apache.logging.log4j.core.config.plugins.PluginAttribute; |
| 7 | | - | import org.apache.logging.log4j.core.config.plugins.PluginElement; |
| 8 | | - | import org.apache.logging.log4j.core.config.plugins.PluginFactory; |
| 9 | | - | |
| 10 | | - | import javax.swing.*; |
| 11 | | - | import java.util.ArrayList; |
| 12 | | - | |
| 13 | | - | import static javax.swing.SwingUtilities.invokeLater; |
| 14 | | - | import static org.apache.logging.log4j.core.config.Property.EMPTY_ARRAY; |
| 15 | | - | import static org.apache.logging.log4j.core.layout.PatternLayout.createDefaultLayout; |
| 16 | | - | |
| 17 | | - | /** |
| 18 | | - | * JTextAreaAppender - https://stackoverflow.com/a/29736246 |
| 19 | | - | * Credit to https://stackoverflow.com/users/4544015/vshiro |
| 20 | | - | */ |
| 21 | | - | |
| 22 | | - | @Plugin(name = "JTextAreaAppender", category = Core.CATEGORY_NAME, elementType = Appender.ELEMENT_TYPE) |
| 23 | | - | public class JTextAreaAppender extends AbstractAppender { |
| 24 | | - | private static volatile ArrayList<JTextArea> textAreas = new ArrayList<>(); |
| 25 | | - | |
| 26 | | - | private int maxLines; |
| 27 | | - | |
| 28 | | - | private JTextAreaAppender(String name, Layout<?> layout, Filter filter, int maxLines, boolean ignoreExceptions) { |
| 29 | | - | super(name, filter, layout, ignoreExceptions, EMPTY_ARRAY); |
| 30 | | - | this.maxLines = maxLines; |
| 31 | | - | } |
| 32 | | - | |
| 33 | | - | @SuppressWarnings("unused") |
| 34 | | - | @PluginFactory |
| 35 | | - | public static JTextAreaAppender createAppender(@PluginAttribute("name") String name, |
| 36 | | - | @PluginAttribute("maxLines") int maxLines, |
| 37 | | - | @PluginAttribute("ignoreExceptions") boolean ignoreExceptions, |
| 38 | | - | @PluginElement("Layout") Layout<?> layout, |
| 39 | | - | @PluginElement("Filters") Filter filter) { |
| 40 | | - | if (name == null) { |
| 41 | | - | LOGGER.error("No name provided for JTextAreaAppender"); |
| 42 | | - | return null; |
| 43 | | - | } |
| 44 | | - | |
| 45 | | - | if (layout == null) { |
| 46 | | - | layout = createDefaultLayout(); |
| 47 | | - | } |
| 48 | | - | return new JTextAreaAppender(name, layout, filter, maxLines, ignoreExceptions); |
| 49 | | - | } |
| 50 | | - | |
| 51 | | - | // Add the target JTextArea to be populated and updated by the logging information. |
| 52 | | - | public static void addLog4j2TextAreaAppender(final JTextArea textArea) { |
| 53 | | - | JTextAreaAppender.textAreas.add(textArea); |
| 54 | | - | } |
| 55 | | - | |
| 56 | | - | @Override |
| 57 | | - | public void append(LogEvent event) { |
| 58 | | - | String message = new String(this.getLayout().toByteArray(event)); |
| 59 | | - | |
| 60 | | - | // Append formatted message to text area using the Thread. |
| 61 | | - | try { |
| 62 | | - | invokeLater(() -> |
| 63 | | - | { |
| 64 | | - | for (JTextArea textArea : textAreas) { |
| 65 | | - | try { |
| 66 | | - | if (textArea != null) { |
| 67 | | - | if (textArea.getText().length() == 0) { |
| 68 | | - | textArea.setText(message); |
| 69 | | - | } else { |
| 70 | | - | textArea.append("\n" + message); |
| 71 | | - | if (maxLines > 0 & textArea.getLineCount() > maxLines + 1) { |
| 72 | | - | int endIdx = textArea.getDocument().getText(0, textArea.getDocument().getLength()).indexOf("\n"); |
| 73 | | - | textArea.getDocument().remove(0, endIdx + 1); |
| 74 | | - | } |
| 75 | | - | } |
| 76 | | - | String content = textArea.getText(); |
| 77 | | - | textArea.setText(content.substring(0, content.length() - 1)); |
| 78 | | - | } |
| 79 | | - | } catch (Throwable throwable) { |
| 80 | | - | throwable.printStackTrace(); |
| 81 | | - | } |
| 82 | | - | } |
| 83 | | - | }); |
| 84 | | - | } catch (IllegalStateException exception) { |
| 85 | | - | exception.printStackTrace(); |
| 86 | | - | } |
| 87 | | - | } |
| 88 | | - | } |
| 89 | | - | |
Corey Arthur
committed
with
GitHub
1 year ago