continuerecord.java

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/* ====================================================================
   Copyright 2002-2004   Apache Software Foundation

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
==================================================================== */
        

package org.apache.poi.hssf.record;

import java.util.ArrayList;

import org.apache.poi.util.LittleEndian;

/**
 * Title:        Continue Record - Helper class used primarily for SST Records <P>
 * Description:  handles overflow for prior record in the input
 *               stream; content is tailored to that prior record<P>
 * @author Marc Johnson (mjohnson at apache dot org)
 * @author Andrew C. Oliver (acoliver at apache dot org)
 * @author Csaba Nagy (ncsaba at yahoo dot com)
 * @version 2.0-pre
 */

public class ContinueRecord
    extends Record
{
    public final static short sid = 0x003C;
    private byte[]            field_1_data;

    /**
     * default constructor
     */

    public ContinueRecord()
    {
    }

    /**
     * Main constructor -- kinda dummy because we don't validate or fill fields
     *
     * @param id record id
     * @param size record size
     * @param data raw data
     */

    public ContinueRecord(short id, short size, byte [] data)
    {
        super(id, size, data);
    }

    /**
     * Main constructor -- kinda dummy because we don't validate or fill fields
     *
     * @param id record id
     * @param size record size
     * @param data raw data
     * @param offset of the record's data
     */

    public ContinueRecord(short id, short size, byte [] data, int offset)
    {
        super(id, size, data, offset);
    }

    /**
     * USE ONLY within "processContinue"
     */

    public byte [] serialize()
    {
        byte[] retval = new byte[ field_1_data.length + 4 ];
        serialize(0, retval);
        return retval;
    }

    public int serialize(int offset, byte [] data)
    {

        LittleEndian.putShort(data, offset, sid);
        LittleEndian.putShort(data, offset + 2, ( short ) field_1_data.length);
        System.arraycopy(field_1_data, 0, data, offset + 4, field_1_data.length);
        return field_1_data.length + 4;
        // throw new RecordFormatException(
        //    "You're not supposed to serialize Continue records like this directly");
    }

    /**
     * set the data for continuation
     * @param data - a byte array containing all of the continued data
     */

    public void setData(byte [] data)
    {
        field_1_data = data;
    }

    /**
     * get the data for continuation
     * @return byte array containing all of the continued data
     */

    public byte [] getData()
    {
        return field_1_data;
    }

    /**
     * Use to serialize records that are too big for their britches (>8228..why 8228 and
     * not 8192 aka 8k?  Those folks in washington don't ususally make sense...
     * or at least to anyone outside fo marketing...
     * @deprecated handle this within the record...this didn't actualyl work out
     */

    public static byte [] processContinue(byte [] data)
    {   // could do this recursively but that seems hard to debug

        // how many continue records do we need
        // System.out.println("In ProcessContinue");
        int       records   = (data.length / 8214);   // we've a 1 offset but we're also off by one due to rounding...so it balances out
        int       offset    = 8214;

        // System.out.println("we have "+records+" continue records to process");
        ArrayList crs       = new ArrayList(records);
        int       totalsize = 8214;
        byte[]    retval    = null;

        for (int cr = 0; cr < records; cr++)
        {
            ContinueRecord contrec   = new ContinueRecord();
            int            arraysize = Math.min((8214 - 4), (data.length - offset));
            byte[]         crdata    = new byte[ arraysize ];

            System.arraycopy(data, offset, crdata, 0, arraysize);

            // System.out.println("arraycopy(data,"+offset+",crdata,"+0+","+arraysize+");");
            offset += crdata.length;
            contrec.setData(crdata);
            crs.add(contrec.serialize());
        }
        for (int cr = 0; cr < records; cr++)
        {
            totalsize += (( byte [] ) crs.get(cr)).length;
        }

        // System.out.println("totalsize="+totalsize);
        retval = new byte[ totalsize ];
        offset = 8214;
        System.arraycopy(data, 0, retval, 0, 8214);
        for (int cr = 0; cr < records; cr++)
        {
            byte[] src = ( byte [] ) crs.get(cr);

            System.arraycopy(src, 0, retval, offset, src.length);

            // System.out.println("arraycopy(src,"+0+",retval,"+offset+","+src.length+");");
            offset += src.length;
        }
        return retval;
    }

    /**
     * Fill the fields. Only thing is, this record has no fields --
     *
     * @param ignored_parm1 Ignored
     * @param ignored_parm2 Ignored
     */

    protected void fillFields(byte [] ignored_parm1, short ignored_parm2)
    {
        this.field_1_data = ignored_parm1;
        // throw new RecordFormatException("Are you crazy?  Don't fill a continue record");
        // do nothing
    }

    /**
     * Make sure we have a good id
     *
     * @param id the alleged id
     */

    protected void validateSid(short id)
    {
        if (id != ContinueRecord.sid)
        {
            throw new RecordFormatException("Not a Continue Record");
        }
    }

    /**
     * Debugging toString
     *
     * @return string representation
     */

    public String toString()
    {
        StringBuffer buffer = new StringBuffer();

        buffer.append("[CONTINUE RECORD]\n");
        buffer.append("    .id        = ").append(Integer.toHexString(sid))
            .append("\n");
        buffer.append("[/CONTINUE RECORD]\n");
        return buffer.toString();
    }

    public short getSid()
    {
        return this.sid;
    }

    /**
     * Fill the fields. Only thing is, this record has no fields --
     *
     * @param ignored_parm1 Ignored
     * @param ignored_parm2 Ignored
     * @param ignored_parm3 Ignored
     */

    protected void fillFields(byte [] ignored_parm1, short ignored_parm2, int ignored_parm3)
    {
    }

    /**
     * Clone this record.
     */
    public Object clone() {
      ContinueRecord clone = new ContinueRecord();
      clone.setData(field_1_data);
      return clone;
    }

}