org.zephyrsoft.sdb2.gui.renderer.SongCellRenderer.java Source code

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Here is the source code for org.zephyrsoft.sdb2.gui.renderer.SongCellRenderer.java

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/*
 * This file is part of the Song Database (SDB).
 * 
 * SDB 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 2 of the License, or
 * (at your option) any later version.
 * 
 * SDB 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 SDB. If not, see <http://www.gnu.org/licenses/>.
 */
package org.zephyrsoft.sdb2.gui.renderer;

import java.awt.Color;
import java.awt.Component;

import javax.swing.JList;
import javax.swing.ListCellRenderer;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.JTextComponent;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.zephyrsoft.sdb2.Feature;
import org.zephyrsoft.sdb2.gui.SongCell;
import org.zephyrsoft.sdb2.model.Song;
import org.zephyrsoft.sdb2.model.SongParser;
import org.zephyrsoft.sdb2.service.IndexerServiceImpl;
import org.zephyrsoft.util.gui.SongCellHighlighter;

/**
 * A {@link ListCellRenderer} for {@link Song} values.
 * 
 * @author Mathis Dirksen-Thedens
 */
public class SongCellRenderer implements ListCellRenderer<Song> {

    private static final long serialVersionUID = -9042262843850129406L;

    private static final Logger LOG = LoggerFactory.getLogger(SongCellRenderer.class);

    private JTextComponent filterInputField;
    private SongCellHighlighter highlighter;

    public SongCellRenderer(JTextComponent filterInputField) {
        this.filterInputField = filterInputField;

        if (Feature.HIGHLIGHT_FILTER_MATCHES.isActive()) {
            highlighter = new SongCellHighlighter();
            updateHighlighter();

            this.filterInputField.getDocument().addDocumentListener(new DocumentListener() {
                @Override
                public void removeUpdate(DocumentEvent e) {
                    updateHighlighter();
                }

                @Override
                public void insertUpdate(DocumentEvent e) {
                    updateHighlighter();
                }

                @Override
                public void changedUpdate(DocumentEvent e) {
                    updateHighlighter();
                }
            });
        }
    }

    private void updateHighlighter() {
        if (Feature.HIGHLIGHT_FILTER_MATCHES.isActive()) {
            String findRegex = constructFindRegex(filterInputField.getText());
            String replaceRegex = constructReplaceRegex(filterInputField.getText());
            LOG.debug("new find regex: {}", findRegex);
            LOG.debug("new replace regex: {}", replaceRegex);
            highlighter.setFindRegex(findRegex);
            highlighter.setReplaceRegex(replaceRegex);
        }
    }

    private String constructFindRegex(String filter) {
        if (StringUtils.isBlank(filter)) {
            return "";
        }
        StringBuilder ret = new StringBuilder();
        ret.append("(?i)^(.*)(");
        String[] filterParts = filter.toLowerCase().split(IndexerServiceImpl.TERM_SPLIT_REGEX);
        boolean isFirst = true;
        for (String filterPart : filterParts) {
            if (isFirst) {
                isFirst = false;
            } else {
                ret.append(")([^ ]* [^ ]*)(");
            }
            ret.append(filterPart);
        }
        ret.append(")(.*)$");
        return ret.toString();
    }

    private String constructReplaceRegex(String filter) {
        if (StringUtils.isBlank(filter)) {
            return "";
        }
        StringBuilder ret = new StringBuilder();
        ret.append("<html>$1<b>");
        String[] filterParts = filter.toLowerCase().split(IndexerServiceImpl.TERM_SPLIT_REGEX);
        int matchNumber = 2;
        for (@SuppressWarnings("unused")
        String filterPart : filterParts) {
            if (matchNumber > 2) {
                ret.append("</b>$" + matchNumber++ + "<b>");
            }
            ret.append("$" + matchNumber++);
        }
        ret.append("</b>$").append(matchNumber).append("</html>");
        return ret.toString();
    }

    @Override
    public Component getListCellRendererComponent(JList<? extends Song> list, Song value, int index,
            boolean isSelected, boolean cellHasFocus) {

        SongCell ret = new SongCell(30);
        ret.setSongTitle(value.getTitle());
        ret.setFirstLine(SongParser.getFirstLyricsLine(value));

        ret.setForeground(Color.BLACK);
        if (isSelected) {
            ret.setBackground(new Color(183, 200, 213));
        } else {
            if (index % 2 == 0) {
                ret.setBackground(Color.WHITE);
            } else {
                ret.setBackground(new Color(230, 230, 230));
            }
        }

        if (Feature.HIGHLIGHT_FILTER_MATCHES.isActive()) {
            highlighter.highlight(ret);
        }

        return ret;
    }
}