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Alpheus AFP Parser is a library and parser for the IBM Advanced Function Presentation (AFP) document/print stream format. Alpheus covers all AFP specifications: MO:DCA, BCOCA, CMOCA, FOCA, GOCA, IOCA, and PTOCA. It is a complete implementation. Every Structured Field, Repeating Group, and Triplet is fully implemented as Java class. Alpheus AFP Parser was written from scratch and has no external dependencies. Copyright 2015,2016 Rudolf Fiala Alpheus AFP Parser is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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/*
Copyright 2015 Rudolf Fiala

This file is part of Alpheus AFP Parser.

Alpheus AFP Parser is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Alpheus AFP Parser 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with Alpheus AFP Parser.  If not, see 
*/
package com.mgz.afp.parser;

import com.mgz.afp.base.StructuredField;
import com.mgz.afp.exceptions.AFPParserException;
import com.mgz.afp.triplets.Triplet;
import com.mgz.afp.triplets.Triplet.TripletID;
import com.mgz.util.UtilBinaryDecoding;

import java.util.ArrayList;
import java.util.List;

public class TripletParser {

  /**
   * Parses Triplets from given data, starting at position offset for length bytes. If parameter
   * length = -1, it tries to parse all up to the end of sfData.
   *
   * @return List of resulting Triplets contained in the given data.
   */
  public static List parseTriplets(byte[] sfData, int offset, int length, AFPParserConfiguration config) {
    List resultingTriplets = new ArrayList();

    int actualLength = StructuredField.getActualLength(sfData, offset, length);
    int pos = 0;
    while (pos < actualLength) {
      Triplet triplet;
      try {
        triplet = parseTriplet(sfData, offset + pos, actualLength - pos, config);
      } catch (AFPParserException pex) {
        Triplet.Undefined undef = null;
        triplet = undef = new Triplet.Undefined();
        undef.setParsingException(pex);
        byte[] tripletData = new byte[actualLength];
        System.arraycopy(sfData, offset, tripletData, 0, actualLength);
        undef.setTripletData(tripletData);
        undef.setLength((short) (sfData[offset + pos] & 0xFF));
        undef.setTripletID(TripletID.Undefined);
      }
      resultingTriplets.add(triplet);

      pos += triplet.getLength();
    }


    return resultingTriplets;
  }

  public static Triplet parseTriplet(byte[] sfData, int offset, int length, AFPParserConfiguration config) throws AFPParserException {
    Triplet resultingTriplet = null;

    short tripletLength = UtilBinaryDecoding.parseShort(sfData, offset, 1);
    short actualTripletID = UtilBinaryDecoding.parseShort(sfData, offset + 1, 1);

    TripletID tripletID = null;

    if (actualTripletID != Triplet.UNFORTUNATE_TRIPLETID) {
      try {
        tripletID = TripletID.valueOf(actualTripletID);
      } catch (AFPParserException ex) {
        tripletID = TripletID.Undefined;
      }

    } else {
      // Handle unfortunate triplet ID.
      // Determine if it is a ResourceObjectType or ObjectFunctionSetSpecification_Retired;

      int significantNumber = UtilBinaryDecoding.parseInt(sfData, offset + 4, 2);
      if (significantNumber == 0x8000) {
        // It is a ObjectFunctionSetSpecification_Retired
        tripletID = TripletID.ObjectFunctionSetSpecification_Retired;
      } else {
        // It is a ResourceObjectType
        tripletID = TripletID.ResourceObjectType;
      }

    }

    if (tripletID == TripletID.Undefined) {
      resultingTriplet = new Triplet.Undefined();
      resultingTriplet.setLength(tripletLength);
      resultingTriplet.setTripletID(TripletID.Undefined);
    } else {
      resultingTriplet = createTripletInstance(tripletID);
      resultingTriplet.setLength(tripletLength);
    }

    resultingTriplet.decodeAFP(sfData, offset, tripletLength, config);

    return resultingTriplet;
  }

  public static final Triplet createTripletInstance(TripletID tid) {
    Triplet cs = null;

    try {
      String classname = Triplet.class.getName() + "$" + tid.name();
      Class clazz = Class.forName(classname);
      cs = (Triplet) clazz.newInstance();
    } catch (Exception cnfex) {
      // NOP.
    }

    if (cs == null) {
      cs = new Triplet.Undefined();
    }
    cs.setTripletID(tid);

    return cs;
  }
}