pdfbox-trunk/preflight/src/main/java/org/apache/pdfbox/preflight/graphic/ColorSpaceHelperFactory.java
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package org.apache.pdfbox.preflight.graphic;

import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
import org.apache.pdfbox.preflight.PreflightContext;

/**
 * This factory create the right Helper according to the owner of the ColorSpace entry.
 */
public class ColorSpaceHelperFactory
{

    /**
     * Return an instance of ColorSpaceHelper according to the ColorSpaceRestriction value.
     * <UL>
     * <li>ColorSpaceRestriction.NO_PATTERN : returns NoPatternColorSpaceHelper
     * <li>ColorSpaceRestriction.ONLY_DEVICE : returns DeviceColorSpaceHelper
     * <li>ColorSpaceRestriction.NO_RESTRICTION (default) : returns StandardColorSpaceHelper
     * </UL>
     * 
     * @param context
     *            the PreflightContext to access useful data
     * @param cs
     *            the High level PDFBox object which represents the ColorSpace
     * @param csr
     *            the color space restriction
     * @return the ColorSpaceHelper instance. 
     */
    public ColorSpaceHelper getColorSpaceHelper(PreflightContext context, PDColorSpace cs, ColorSpaceRestriction csr)
    {
        switch (csr)
        {
        case NO_PATTERN:
            return new NoPatternColorSpaceHelper(context, cs);
        case ONLY_DEVICE:
            return new DeviceColorSpaceHelper(context, cs);
        default:
            return new StandardColorSpaceHelper(context, cs);
        }
    }

    /**
     * Enum used as argument of methods of this factory to return the right Helper.
     */
    public enum ColorSpaceRestriction
    {
        NO_RESTRICTION, NO_PATTERN, ONLY_DEVICE
    }
}
