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/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2016 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * FunctionFactory.java
 * ---------------
 */
package org.jpedal.function;

import org.jpedal.color.ColorspaceFactory;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.raw.PdfArrayIterator;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;

/**
 * return the correct PDF function - all implement PDF function interface
 */
public class FunctionFactory {

	/**
	 * Get the correct Function for the shading objct
	 * @param currentPdfFile :: Current PDF File data
	 * @return The required function
	 */
	public static PDFFunction getFunction(final PdfObject functionObj, final PdfObjectReader currentPdfFile) {

		PDFFunction newFunction=null;

		final byte[] stream=functionObj.getDecodedStream();

        final float[] domain=functionObj.getFloatArray(PdfDictionary.Domain);
        final float[] range=functionObj.getFloatArray(PdfDictionary.Range);

        final int type =functionObj.getInt(PdfDictionary.FunctionType);
        final int bits=functionObj.getInt(PdfDictionary.BitsPerSample);
		final float[] decode=functionObj.getFloatArray(PdfDictionary.Decode);
		final float[] C0=functionObj.getFloatArray(PdfDictionary.C0);
		final float[] C1=functionObj.getFloatArray(PdfDictionary.C1);
		final int[] size=functionObj.getIntArray(PdfDictionary.Size);
		final float[] encode=functionObj.getFloatArray(PdfDictionary.Encode);
		final float[] bounds=functionObj.getFloatArray(PdfDictionary.Bounds);

		//set order
		float N=0;
        final float newN=functionObj.getFloatNumber(PdfDictionary.N);
        if(newN!=-1) {
            N = newN;
        }

		final PdfArrayIterator keys=functionObj.getMixedArray(PdfDictionary.Functions);
		int functionCount=0;
		if(keys!=null) {
            functionCount = keys.getTokenCount();
        }

		PDFFunction[] functions=null;
		
		if(keys!=null){
			
			final PdfObject[] subFunction=new PdfObject[functionCount];
			
			for(int i=0;i