com.google.devtools.depan.filesystem.eclipse.FileSystemNodePainter.java Source code

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Here is the source code for com.google.devtools.depan.filesystem.eclipse.FileSystemNodePainter.java

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/*
 * Copyright 2008 The Depan Project Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.devtools.depan.filesystem.eclipse;

import com.google.devtools.depan.filesystem.eclipse.preferences.ColorPreferencesIds;
import com.google.devtools.depan.filesystem.graph.DirectoryElement;
import com.google.devtools.depan.filesystem.graph.FileElement;
import com.google.devtools.depan.filesystem.graph.FileSystemElementDispatcher;
import com.google.devtools.depan.model.Element;
import com.google.devtools.depan.model.ElementTransformer;
import com.google.devtools.depan.platform.Colors;

import com.google.common.base.Strings;

import org.eclipse.jface.preference.IPreferenceStore;

import java.awt.Color;

/**
 * Responsible for providing <code>Color</code>s for
 * {@link com.google.devtools.depan.filesystem.elements.FileSystemElement}s.
 *
 * @author tugrul@google.com (Tugrul Ince)
 */
public class FileSystemNodePainter extends FileSystemElementDispatcher<Color> implements ElementTransformer<Color> {

    private static final IPreferenceStore prefs = FileSystemActivator.getDefault().getPreferenceStore();

    private static final Color getColor(String key) {
        String colorTxt = prefs.getString(key);
        if (Strings.isNullOrEmpty(colorTxt)) {
            return Color.BLACK;
        }

        return Colors.getRgb(colorTxt);
    }

    /**
     * An instance of this class used by other classes.
     */
    private static final FileSystemNodePainter INSTANCE = new FileSystemNodePainter();

    /**
     * Returns the singleton instance of this class.
     *
     * @return The singleton instance of this class.
     */
    public static FileSystemNodePainter getInstance() {
        return INSTANCE;
    }

    private FileSystemNodePainter() {
        // prevent instantiation by others
    }

    /**
     * Returns the <code>Color</code> for the given element.
     *
     * @param element The element whose associated <code>Color</code> is
     * requested.
     * @return <code>Color</code> associated with 
     * {@link com.google.devtools.depan.filesystem.elements.FileSystemElement}s.
     */
    @Override
    public Color match(FileElement element) {
        return getColor(ColorPreferencesIds.COLOR_FILE);
    }

    /**
     * Returns the <code>Color</code> for the given element.
     *
     * @param element The element whose associated <code>Color</code> is
     * requested.
     * @return <code>Color</code> associated with {@link DirectoryElement}s.
     */
    @Override
    public Color match(DirectoryElement element) {
        return getColor(ColorPreferencesIds.COLOR_DIRECTORY);
    }

    /**
     * Returns the <code>Color</code> for the given element.
     *
     * @param element The element whose associated <code>Color</code> is
     * requested.
     * @return <code>Color</code> associated with given {@link Element}.
     */
    @Override
    public Color transform(Element element) {
        return match(element);
    }
}