org.executequery.components.TextAreaLogAppender.java Source code

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Here is the source code for org.executequery.components.TextAreaLogAppender.java

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/*
 * TextAreaLogAppender.java
 *
 * Copyright (C) 2002-2015 Takis Diakoumis
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */

package org.executequery.components;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JTextArea;

import org.apache.commons.lang.ArrayUtils;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Layout;
import org.apache.log4j.spi.LoggingEvent;
import org.executequery.util.ThreadUtils;

/**
 *
 * @author   Takis Diakoumis
 * @version  $Revision: 1516 $
 * @date     $Date: 2015-10-05 22:31:59 +1100 (Mon, 05 Oct 2015) $
 */
public class TextAreaLogAppender extends AppenderSkeleton {

    /** the text area component to be appended to */
    private JTextArea textArea;

    /** matcher to remove new lines from log messages */
    private Matcher newLineMatcher;

    /** space string for new line replacement */
    private static final String SPACE = " ";

    /** Creates a new instance of TextAreaLogAppender */
    public TextAreaLogAppender(JTextArea textArea) {

        this.textArea = textArea;
        newLineMatcher = Pattern.compile("[\n\r]+").matcher("");
    }

    public boolean requiresLayout() {

        return true;
    }

    public synchronized void append(final LoggingEvent event) {

        ThreadUtils.invokeLater(new Runnable() {

            @Override
            public void run() {

                String text = null;
                Object message = event.getMessage();
                if (message instanceof String) {

                    text = (String) message;
                    if (text.length() == 1 && Character.isWhitespace(text.charAt(0))) {

                        return;
                    }

                }

                text = layout.format(event);
                newLineMatcher.reset(text);
                text = newLineMatcher.replaceAll(SPACE).trim();

                textArea.append(text);
                textArea.append(Layout.LINE_SEP);

                String[] s = event.getThrowableStrRep();
                if (ArrayUtils.isNotEmpty(s)) {

                    for (int i = 0; i < s.length; i++) {

                        textArea.append(s[i]);
                        textArea.append(Layout.LINE_SEP);
                    }
                }

                textArea.setCaretPosition(textArea.getText().length());

            }
        });

    }

    public void close() {
    }

}