1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   package org.apache.pdfbox.pdmodel.common.function;
   18   
   19   import org.apache.pdfbox.pdmodel.PDDocument;
   20   import org.apache.pdfbox.pdmodel.common.PDStream;
   21   import org.apache.pdfbox.cos.COSArray;
   22   import java.io.IOException;
   23   
   24   /**
   25    * This class represents a type 4 function in a PDF document.
   26    *
   27    * @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
   28    * @version $Revision: 1.2 $
   29    */
   30   public class PDFunctionType4 extends PDStreamFunction
   31   {
   32   
   33       /**
   34        * Constructor to create a new blank type 4 function.
   35        *
   36        * @param doc The document that the function will be part of.
   37        */
   38       protected PDFunctionType4( PDDocument doc )
   39       {
   40           super( doc, 4 );
   41       }
   42   
   43       /**
   44        * Constructor.
   45        *
   46        * @param functionDictionary The prepopulated function dictionary.
   47        */
   48       public PDFunctionType4( PDStream functionDictionary )
   49       {
   50           super( functionDictionary );
   51       }
   52       
   53       
   54       /**
   55       * {@inheritDoc}
   56       */
   57       public COSArray Eval(COSArray input) throws IOException
   58       {
   59           //Implementation here will require evaluation of PostScript functions.
   60           //See section 3.9.4 of the PDF Reference.
   61           throw new IOException("Not Implemented");
   62       }
   63   }