poi/src/java/org/apache/poi/hssf/record/UnknownRecord.java

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package org.apache.poi.hssf.record;

import org.apache.poi.util.LittleEndian;

/**
 * Title:        Unknown Record (for debugging)<P>
 * Description:  Unknown record just tells you the sid so you can figure out
 *               what records you are missing.  Also helps us read/modify sheets we
 *               don't know all the records to.  (HSSF leaves these alone!) <P>
 * Company:      SuperLink Software, Inc.<P>
 * @author Andrew C. Oliver (acoliver at apache dot org)
 * @author Jason Height (jheight at chariot dot net dot au)
 * @author Glen Stampoultzis (glens at apache.org)
 */

public class UnknownRecord
    extends Record
{
    private short   sid     = 0;
    private byte[]  thedata = null;

    public UnknownRecord()
    {
    }

    /**
     * construct an unknown record.  No fields are interperated and the record will
     * be serialized in its original form more or less
     * @param id    id of the record -not validated, just stored for serialization
     * @param size  size of the data
     * @param data  the data
     */

    public UnknownRecord(short id, short size, byte [] data)
    {
        sid     = id;
        thedata = data;
    }

    /**
     * spit the record out AS IS.  no interperatation or identification
     */

    public int serialize(int offset, byte [] data)
    {
        if (thedata == null)
        {
            thedata = new byte[ 0 ];
        }
        LittleEndian.putShort(data, 0 + offset, sid);
        LittleEndian.putShort(data, 2 + offset, ( short ) (thedata.length));
        if (thedata.length > 0)
        {
            System.arraycopy(thedata, 0, data, 4 + offset, thedata.length);
        }
        return getRecordSize();
    }

    public int getRecordSize()
    {
        int retval = 4;

        if (thedata != null)
        {
            retval += thedata.length;
        }
        return retval;
    }

    protected void fillFields(byte [] data, short sid)
    {
        this.sid     = sid;
        thedata = data;
    }

    /**
     * NO OP!
     */

    protected void validateSid(short id)
    {

        // if we had a valid sid we wouldn't be using the "Unknown Record" record now would we?
    }

    /**
     * print a sort of string representation ([UNKNOWN RECORD] id = x [/UNKNOWN RECORD])
     */

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

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

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

    /**
     * called by the constructor, should set class level fields.  Should throw
     * runtime exception for bad/icomplete data.
     *
     * @param data raw data
     * @param size size of data
     * @param offset of the records data (provided a big array of the file)
     */

    protected void fillFields(byte [] data, short size, int offset)
    {
        throw new RecordFormatException(
            "Unknown record cannot be constructed via offset -- we need a copy of the data");
    }

    /** Unlike the other Record.clone methods this is a shallow clone*/
    public Object clone() {
      UnknownRecord rec = new UnknownRecord();
      rec.sid = sid;
      rec.thedata = thedata;
      return rec;
    }
}