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/* jdwglib. Java Library for reading Dwg files.

 * 

 * Author: Equipo de desarrollo de gvSIG.

 * Port from the Pythoncad Dwg library by Art Haas.

 *

 * Copyright (C) 2007 IVER TI S.A. and Generalitat Valenciana

 *

 * This program 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 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 * IVER TI S.A.

 *  C/Salamanca, 50

 *  46005 Valencia

 *  Spain

 *  +34 963163400

 *  dac@iver.es

 */package com.iver.cit.jdwglib.dwg;

import java.util.ArrayList;

import com.iver.cit.gvsig.fmap.drivers.dgn.ByteUtils;

public class DwgHandleReference {

        private Integer code=null;

        private Integer offset=null;

        public DwgHandleReference(int code, int offset){

                this.code=new Integer(code);

                this.offset=new Integer(offset);

        }

        public DwgHandleReference(){

        }

        public void setCode(int code){

                this.code = new Integer(code);

        }

        public void setOffset(int offset){

                this.offset=new Integer(offset);

        }

        public int getCode(){

                return this.code.intValue();

        }

        public int getOffset(){

                return this.offset.intValue();

        }

        /**

         * Read a pair of int values (the HandleCode and HandleOffset of a handle of a DWG object)

         * from a group of unsigned bytes and initializes the properties.

         * 

         * @param data Array of unsigned bytes obtained from the DWG binary file

         * @param offset The current bit offset where the value begins

         * @throws Exception If an unexpected bit value is found in the DWG file. Occurs

         *                    when we are looking for LwPolylines.

         * @return int Represents the new offset.

         * 

         *          */

        public int read(int[] data, int offset) throws RuntimeException, CorruptedDwgEntityException{

                ArrayList v = new ArrayList();

                int code = ((Integer)DwgUtil.getBits(data, 4, offset)).intValue();

                int counter = ((Integer)DwgUtil.getBits(data, 4, (offset + 4))).intValue();

                int read = 8;

                ArrayList hlist = new ArrayList();

                if (counter>0) {

                        int hlen = counter * 8;

                        Object handle = DwgUtil.getBits(data, hlen, (offset + 8));

                        read = read + hlen;

                        if (hlen > 8) {

                                byte[] handleBytes = (byte[])handle;

                                int[] handleInts = new int[handleBytes.length];

                                // Hacerlos unsigned ...

                                for (int i=0; i<handleBytes.length; i++) {

                                        handleInts[i] = ByteUtils.getUnsigned(handleBytes[i]);

                                }

                                for (int i=0; i<handleInts.length; i++) {

                                        hlist.add(new Integer(handleInts[i]));

                                }

                        } else {

                                hlist.add(handle);

                        }

                }

                v.add(new Integer(code));

                v.add(new Integer(counter));

                for (int i=0;i<hlist.size();i++) {

                        v.add(hlist.get(i));

                }

                setCode(code);

                setOffset(DwgUtil.handleBinToHandleInt(v));

                return offset+read;

        }

}