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/*
 * #%L
 * JAXX :: Runtime
 * 
 * $Id: AbstractNavTreeCellRenderer.java 2225 2011-02-19 20:15:00Z tchemit $
 * $HeadURL: http://svn.nuiton.org/svn/jaxx/tags/jaxx-2.5.19/jaxx-runtime/src/main/java/jaxx/runtime/swing/nav/tree/AbstractNavTreeCellRenderer.java $
 * %%
 * Copyright (C) 2008 - 2010 CodeLutin
 * %%
 * This program 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.
 * 
 * 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 Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * .
 * #L%
 */
package jaxx.runtime.swing.nav.tree;

import jaxx.runtime.swing.nav.NavDataProvider;
import jaxx.runtime.swing.nav.NavNode;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.swing.tree.DefaultTreeCellRenderer;
import java.util.HashMap;
import java.util.Map;

import static org.nuiton.i18n.I18n._;

/**
 * Le renderer abstrait (qui a toutes les methodes qui aident) pour implanter de
 * vrai renderer pour les différents cas d'utilisation de l'abre de navigation.
 *
 * @author chemit 
 * @since 1.2
 */
public abstract class AbstractNavTreeCellRenderer> extends DefaultTreeCellRenderer {

    /** Logger */
    protected static final Log log =
            LogFactory.getLog(AbstractNavTreeCellRenderer.class);

    /** source de donnée */
    protected NavDataProvider dataProvider;

    /** le cache de rendu */
    protected final Map renderCache = new HashMap();

    /**
     * Determines the text render of a node using the {@link #dataProvider}.
     *
     * @param node the node to render
     * @return the text render of the node
     */
    protected abstract String computeNodeText(N node);

    protected AbstractNavTreeCellRenderer() {
    }

    public NavDataProvider getDataProvider() {
        return dataProvider;
    }

    public void setDataProvider(NavDataProvider dataProvider) {
        this.dataProvider = dataProvider;

        // une nouvelle source utilisée, on vide le cache
        clearCache();
    }

    public void clearCache() {
        renderCache.clear();
    }

    public void invalidateCache(N node) {
        renderCache.remove(node);
    }

    @Override
    protected void finalize() throws Throwable {
        super.finalize();
        clearCache();
    }

    public String getNodeText(N node) {
        if (node == null) {
            return null;
        }
        String text;

        if (node.isDirty() || !renderCache.containsKey(node)) {

            // calculer le rendu du noeud
            if (node.isStringNode()) {
                text = _(node.getId());

            } else {

                text = computeNodeText(node);
            }

            if (log.isDebugEnabled()) {
                log.debug("text for node [" + node + "] = <" + text + ">");
            }

            // sauvegarde dans le cache
            renderCache.put(node, text);

            // le noeud est de nouveau propre
            node.setDirty(false);

        } else {

            // recupération directement du rendu dans le cache
            text = renderCache.get(node);
        }

        return text;
    }
}