/**
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.jpedal.org
* (C) Copyright 1997-2008, IDRsolutions and Contributors.
*
* This file is part of JPedal
*
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.io.*;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.FunctionObject;
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(PdfObject functionObj, PdfObjectReader currentPdfFile) {
PDFFunction newFunction=null;
/**
* get values and handle reference
**/
byte[] stream=functionObj.getDecodedStream();
float[] domain=functionObj.getFloatArray(PdfDictionary.Domain);
float[] range=functionObj.getFloatArray(PdfDictionary.Range);
int type =functionObj.getInt(PdfDictionary.FunctionType);
int bits=functionObj.getInt(PdfDictionary.BitsPerSample);
float[] decode=functionObj.getFloatArray(PdfDictionary.Decode);
float[] C0=functionObj.getFloatArray(PdfDictionary.C0);
float[] C1=functionObj.getFloatArray(PdfDictionary.C1);
int[] size=functionObj.getIntArray(PdfDictionary.Size);
float[] encode=functionObj.getFloatArray(PdfDictionary.Encode);
float[] bounds=functionObj.getFloatArray(PdfDictionary.Bounds);
//set order
float N=0,newN=functionObj.getFloatNumber(PdfDictionary.N);
if(newN!=-1)
N=newN;
byte[][] keys=functionObj.getKeyArray(PdfDictionary.Functions);
int functionCount=0;
if(keys!=null)
functionCount=keys.length;
PDFFunction[] functions=null;
PdfObject function;
if(keys!=null){
PdfObject[] subFunction=new PdfObject[functionCount];
String id;
for(int i=0;i<functionCount;i++){
id=new String(keys[i]);
if(id.startsWith("<<")){
function=new FunctionObject(1);
ObjectDecoder objectDecoder=new ObjectDecoder(currentPdfFile.getObjectReader());
objectDecoder.readDictionaryAsObject(function,0,keys[i]);
}else{
function=new FunctionObject(id);
currentPdfFile.readObject(function);
}
subFunction[i]=function;
}
functions = new PDFFunction[subFunction.length];
/**
* get values for sub stream Function
*/
for (int i1 =0,imax= subFunction.length; i1 <imax; i1++)
functions[i1] = FunctionFactory.getFunction(subFunction[i1], currentPdfFile);
}
switch (type) {
case 0 :
newFunction=new PDFSampled(stream,bits, domain, range, encode, decode, size);
break;
case 2 :
newFunction=new PDFExponential(N,C0, C1, domain,range);
break;
case 3 :
newFunction = new PDFStitching(functions, encode, bounds, domain,range);
break;
case 4 :
newFunction=new PDFCalculator(stream,domain,range);
break;
}
return newFunction;
}
}