/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal.decorators;

import java.util.List;
import java.util.ListIterator;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;

/** 
 * The Decoration Result is the result of a decoration.
 */
class DecorationResult {

    private List prefixes;

    private List suffixes;

    private ImageDescriptor[] descriptors;
    
    private Color foregroundColor;
    
    private Color backgroundColor;
    
    private Font font;

    DecorationResult(List prefixList, List suffixList,
            ImageDescriptor[] imageDescriptors,
			Color resultForegroundColor,
			Color resultBackgroundColor,
			Font resultFont) {
        prefixes = prefixList;
        suffixes = suffixList;

        //Don't set the field if there are no entries
        if (hasOverlays(imageDescriptors))
            descriptors = imageDescriptors;
        foregroundColor = resultForegroundColor;
        backgroundColor = resultBackgroundColor;
        font = resultFont;
    }

    /**
     * Return whether or not any of the imageDescriptors
     * are non-null.
     * @param imageDescriptors
     * @return <code>true</code> if there are some non-null
     * overlays
     */
    private boolean hasOverlays(ImageDescriptor[] imageDescriptors) {
        for (int i = 0; i < imageDescriptors.length; i++) {
            if (imageDescriptors[i] != null)
                return true;
        }
        return false;
    }

    /**
     * Decorate the Image supplied with the overlays.
     * @param image
     * @param overlayCache
     * @return Image
     */
    Image decorateWithOverlays(Image image, OverlayCache overlayCache) {

        //Do not try to do anything if there is no source or overlays
        if (image == null || descriptors == null)
            return image;

        return overlayCache.applyDescriptors(image, descriptors);
    }

    /**
     * Decorate the String supplied with the prefixes and suffixes.
     * @param text 
     * @return String
     */
    String decorateWithText(String text) {

        if (prefixes.isEmpty() && suffixes.isEmpty())
            return text;

        StringBuffer result = new StringBuffer();

        ListIterator prefixIterator = prefixes.listIterator();

        while (prefixIterator.hasNext()) {
            result.append(prefixIterator.next());
        }

        result.append(text);

        ListIterator suffixIterator = suffixes.listIterator();

        while (suffixIterator.hasNext()) {
            result.append(suffixIterator.next());
        }

        return result.toString();
    }

    /**
     * Get the descriptor array for the receiver.
     * @return ImageDescriptor[] or <code>null</code>
     */
    ImageDescriptor[] getDescriptors() {
        return descriptors;
    }

    /**
     * Get the prefixes for the receiver.
     * @return List
     */
    List getPrefixes() {
        return prefixes;
    }

    /**
     * Get the suffixes for the receiver.
     * @return List
     */
    List getSuffixes() {
        return suffixes;
    }

	/**
	 * Return the background Color for the result.
	 * @return Color
	 */
	Color getBackgroundColor() {
		return backgroundColor;
	}
	/**
	 * Return the font for the result.
	 * @return Font
	 */
	Font getFont() {
		return font;
	}
	/**
	 * Return the foreground color for the result.
	 * @return Color
	 */
	Color getForegroundColor() {
		return foregroundColor;
	}
}
