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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.pd;

import de.intarsys.pdf.cos.COSArray;
import de.intarsys.pdf.cos.COSBasedObject;
import de.intarsys.pdf.cos.COSName;
import de.intarsys.pdf.cos.COSNumber;
import de.intarsys.pdf.cos.COSObject;

/**
 * Function implementation for stitching functions.
 */
public class PDStitchingFunction extends PDFunction {
    /**
     * The meta class implementation
     */
    public static class MetaClass extends PDFunction.MetaClass {
        protected MetaClass(Class paramInstanceClass) {
            super(paramInstanceClass);
        }

        @Override
        protected COSBasedObject doCreateCOSBasedObject(COSObject object) {
            return new PDStitchingFunction(object);
        }
    }

    private static final COSName DK_Bounds = COSName.constant("Bounds"); //$NON-NLS-1$

    private static final COSName DK_Encode = COSName.constant("Encode"); //$NON-NLS-1$

    /**
     * The meta class instance
     */
    public static final MetaClass META = new MetaClass(MetaClass.class.getDeclaringClass());

    private static final COSName DK_Functions = COSName.constant("Functions"); //$NON-NLS-1$

    private float[] bounds;

    private float[] encode;

    private PDFunction[] functions;

    protected PDStitchingFunction(COSObject object) {
        super(object);

        COSArray cosBounds;
        COSArray cosEncode;
        int index;

        cosBounds = object.asDictionary().get(DK_Bounds).asArray();
        bounds = new float[cosBounds.size()];
        for (index = 0; index < cosBounds.size(); index++) {
            bounds[index] = ((COSNumber) cosBounds.get(index)).floatValue();
        }

        cosEncode = object.asDictionary().get(DK_Encode).asArray();
        encode = new float[cosEncode.size()];
        for (index = 0; index < cosEncode.size(); index++) {
            encode[index] = ((COSNumber) cosEncode.get(index)).floatValue();
        }

        // color space will be resolved lazily
    }

    @Override
    public float[] evaluate(float[] values) {
        int index;

        for (index = 0; index < bounds.length; index++) {
            if (values[0] < bounds[index]) {
                return getFunctions()[index].evaluate(values);
            }
        }
        return getFunctions()[index].evaluate(values);
    }

    public float[] getBounds() {
        return bounds;
    }

    public float[] getEncode() {
        return encode;
    }

    public PDFunction[] getFunctions() {
        if (functions == null) {
            COSArray cosFunctions;
            int index;

            cosFunctions = cosGetObject().asDictionary().get(DK_Functions).asArray();
            functions = new PDFunction[cosFunctions.size()];
            for (index = 0; index < cosFunctions.size(); index++) {
                functions[index] = (PDFunction) PDFunction.META.createFromCos(cosFunctions.get(index));
            }
        }
        return functions;
    }

    @Override
    public int getOutputSize() {
        return getRange().size() / 2;
    }
}