ecommons.waltable/org.eclipse.statet.ecommons.waltable.core/src/org/eclipse/statet/ecommons/waltable/persistence/ColorPersistor.java

/*=============================================================================#
 # Copyright (c) 2012, 2020 Original NatTable authors and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0
 # 
 # Contributors:
 #     Original NatTable authors and others - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.ecommons.waltable.persistence;

import static org.eclipse.statet.ecommons.waltable.persistence.IPersistable.DOT;

import java.util.Properties;

import org.eclipse.jface.resource.DataFormatException;
import org.eclipse.jface.resource.StringConverter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Display;

import org.eclipse.statet.ecommons.waltable.util.GUIHelper;


public class ColorPersistor {

	public static final String STYLE_PERSISTENCE_PREFIX= "color"; //$NON-NLS-1$
	public static final Color DEFAULT_COLOR= Display.getDefault().getSystemColor(SWT.COLOR_WHITE);

	public static void saveColor(String prefix, final Properties properties, final Color color) {
		prefix= prefix + DOT + STYLE_PERSISTENCE_PREFIX;

		if (color == null) {
			return;
		}
		properties.setProperty(prefix, asString(color));
	}


	public static Color loadColor(String prefix, final Properties properties) {
		prefix= prefix + DOT + STYLE_PERSISTENCE_PREFIX;

		final String colorAsString= properties.getProperty(prefix);
		if (colorAsString == null) {
			return null;
		} else {
			return asColor(colorAsString);
		}
	}

	/**
	 * Create a String representation of the SWT Color
	 */
	public static String asString(final Color color) {
		return StringConverter.asString(color.getRGB());
	}

	/**
	 * Create a Color instance using the String created by {@link ColorPersistor#asColor(String)}
	 */
	public static Color asColor(final String colorAsString) {
		try {
			return GUIHelper.getColor(StringConverter.asRGB(colorAsString));
		} catch (final DataFormatException e) {
			return DEFAULT_COLOR;
		}
	}
}