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This is a backport of OpenJFX 8 to run on Java 7.
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/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.javafx.scene.layout.region;

import com.sun.javafx.css.StyleConverterImpl;
import javafx.css.ParsedValue;
import javafx.scene.layout.BackgroundPosition;
import javafx.scene.text.Font;

/**
 * background-position: 
 * where  = [
 *   [ [  | left | center | right ] [  | top | center | bottom ]? ]
 *   | [ [ center | [ left | right ] ? ] || [ center | [ top | bottom ] ? ]
 * ]
 * @see background-position
 */
public final class LayeredBackgroundPositionConverter extends StyleConverterImpl[], BackgroundPosition[]> {
    private static final LayeredBackgroundPositionConverter LAYERED_BACKGROUND_POSITION_CONVERTER =
            new LayeredBackgroundPositionConverter();

    public static LayeredBackgroundPositionConverter getInstance() {
        return LAYERED_BACKGROUND_POSITION_CONVERTER;
    }

    private LayeredBackgroundPositionConverter() {
        super();
    }

    @Override
    public BackgroundPosition[] convert(ParsedValue[], BackgroundPosition[]> value, Font font) {
        ParsedValue[] layers = value.getValue();
        BackgroundPosition[] positions = new BackgroundPosition[layers.length];
        for (int l = 0; l < layers.length; l++) {
            positions[l] = layers[l].convert(font);
        }
        return positions;
    }

    @Override
    public String toString() {
        return "LayeredBackgroundPositionConverter";
    }
}