net.sf.jasperreports.engine.util.JEditorPaneRtfMarkupProcessor.java Source code

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Here is the source code for net.sf.jasperreports.engine.util.JEditorPaneRtfMarkupProcessor.java

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/*
 * JasperReports - Free Java Reporting Library.
 * Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved.
 * http://www.jaspersoft.com
 *
 * Unless you have purchased a commercial license agreement from Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of JasperReports.
 *
 * JasperReports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JasperReports 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with JasperReports. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.jasperreports.engine.util;

import java.text.AttributedCharacterIterator.Attribute;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import javax.swing.JEditorPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.Element;
import javax.swing.text.AbstractDocument.LeafElement;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author Teodor Danciu (teodord@users.sourceforge.net)
 */
public class JEditorPaneRtfMarkupProcessor extends JEditorPaneMarkupProcessor {
    private static final Log log = LogFactory.getLog(JEditorPaneRtfMarkupProcessor.class);

    private static JEditorPaneRtfMarkupProcessor instance;

    /**
     * 
     */
    public static JEditorPaneRtfMarkupProcessor getInstance() {
        if (instance == null) {
            instance = new JEditorPaneRtfMarkupProcessor();
        }
        return instance;
    }

    @Override
    public String convert(String srcText) {
        JEditorPane editorPane = new JEditorPane("text/rtf", srcText);
        editorPane.setEditable(false);

        List<Element> elements = new ArrayList<Element>();

        Document document = editorPane.getDocument();

        Element root = document.getDefaultRootElement();
        if (root != null) {
            addElements(elements, root);
        }

        String chunk = null;
        Element element = null;
        int startOffset = 0;
        int endOffset = 0;

        JRStyledText styledText = new JRStyledText();
        styledText.setGlobalAttributes(new HashMap<Attribute, Object>());
        for (int i = 0; i < elements.size(); i++) {
            if (chunk != null) {
                styledText.append(chunk);
                styledText.addRun(
                        new JRStyledText.Run(getAttributes(element.getAttributes()), startOffset, endOffset));
            }

            chunk = null;
            element = elements.get(i);
            startOffset = element.getStartOffset();
            endOffset = element.getEndOffset();

            try {
                chunk = document.getText(startOffset, endOffset - startOffset);
            } catch (BadLocationException e) {
                if (log.isDebugEnabled()) {
                    log.debug("Error converting markup.", e);
                }
            }

        }

        if (chunk != null && !"\n".equals(chunk)) {
            styledText.append(chunk);
            styledText.addRun(new JRStyledText.Run(getAttributes(element.getAttributes()), startOffset, endOffset));
        }

        return JRStyledTextParser.getInstance().write(styledText);
    }

    /**
     * 
     */
    protected void addElements(List<Element> elements, Element element) {
        if (element instanceof LeafElement) {
            elements.add(element);
        }
        for (int i = 0; i < element.getElementCount(); i++) {
            Element child = element.getElement(i);
            addElements(elements, child);
        }
    }

}