PropertiesResources.java

package org.swtchart.ext.internal.properties;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;

/**
 * SWT resources created with properties dialog.
 */
public class PropertiesResources {

    /** the fonts */
    private Map<String, Font> fonts;

    /** the colors */
    private Map<String, Color> colors;

    /**
     * The constructor.
     */
    public PropertiesResources() {
        fonts = new HashMap<String, Font>();
        colors = new HashMap<String, Color>();
    }
    
    /**
     * Gets the font associated with the given key.
     * 
     * @param key
     *            the key associated with the font to get
     * @return the font
     */
    public Font getFont(String key) {
        return fonts.get(key);
    }

    /**
     * Gets the color associated with the given key.
     * 
     * @param key
     *            the key associated with the color to get
     * @return the color
     */
    public Color getColor(String key) {
        return colors.get(key);
    }

    /**
     * Puts the given font. If a font associated with the given key already
     * exists, the existing font will be disposed. When chart is disposed, all
     * stored fonts in this object will be disposed.
     * <p>
     * When the resource won't be used, the resource should be disposed and
     * removed.
     * 
     * @param key
     *            the key for given font
     * @param font
     *            the font to be stored
     */
    public void put(String key, Font font) {
        Font oldFont = fonts.get(key);
        if (oldFont != null) {
            oldFont.dispose();
        }
        fonts.put(key, font);
    }

    /**
     * Puts the given color. If a font associated with the given key already
     * exists, the existing color will be disposed. When chart is disposed, all
     * stored colors in this object will be disposed.
     * 
     * @param key
     *            the key for given color
     * @param color
     *            the color to be stored
     */
    public void put(String key, Color color) {
        Color oldColor = colors.get(key);
        if (oldColor != null) {
            oldColor.dispose();
        }
        colors.put(key, color);
    }

    /**
     * Removes the font associated with the given key. This method will be
     * invoked typically when removing series object or axis object.
     * 
     * @param key
     *            the key associated with the font to be removed
     */
    public void removeFont(String key) {
        Font font = fonts.get(key);
        if (font != null) {
            fonts.remove(key);
            font.dispose();
        }
    }

    /**
     * Removes the color associated with the given key. This method will be
     * invoked typically when removing series object or axis object.
     * 
     * @param key
     *            the key associated with the color to be removed
     */
    public void removeColor(String key) {
        Color color = colors.get(key);
        if (color != null) {
            colors.remove(key);
            color.dispose();
        }
    }

    /**
     * Disposes the SWT resources.
     */
    public void dispose() {
        for (Entry<String, Font> entry : fonts.entrySet()) {
            entry.getValue().dispose();
        }
        for (Entry<String, Color> entry : colors.entrySet()) {
            entry.getValue().dispose();
        }
    }
}