org.jpedal.function.FunctionFactory Maven / Gradle / Ivy
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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/java-pdf-library-support/
*
* (C) Copyright 1997-2013, 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.ObjectDecoder;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.raw.FunctionObject;
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(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;
}
}