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   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.hssf.record;

import org.apache.poi.util.IntList;
import org.apache.poi.util.LittleEndianOutput;
import org.apache.poi.util.RecordFormatException;

Title:        Index Record (0x020B)

Description:  Occurs right after BOF, tells you where the DBCELL records are for a sheet
              Important for locating cells

              
REFERENCE:  PG 323 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)
/**
 * Title:        Index Record (0x020B)<p>
 * Description:  Occurs right after BOF, tells you where the DBCELL records are for a sheet
 *               Important for locating cells<p>
 *               
 * REFERENCE:  PG 323 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)
 */
public final class IndexRecord extends StandardRecord implements Cloneable {
    public final static short sid = 0x020B;
    private int                field_2_first_row;       // first row on the sheet
    private int                field_3_last_row_add1;   // last row
    private int                field_4_zero;            // supposed to be zero
    private IntList            field_5_dbcells;         // array of offsets to DBCELL records

    public IndexRecord()
    {
    }

    public IndexRecord(RecordInputStream in)
    {
        int field_1_zero          = in.readInt();
        if (field_1_zero != 0) {
        	throw new RecordFormatException("Expected zero for field 1 but got " + field_1_zero);
        }
        field_2_first_row     = in.readInt();
        field_3_last_row_add1 = in.readInt();
        field_4_zero      = in.readInt();
        
        int nCells = in.remaining() / 4;
        field_5_dbcells = new IntList(nCells);
        for(int i=0; i<nCells; i++) {
            field_5_dbcells.add(in.readInt());
        }
    }

    public void setFirstRow(int row)
    {
        field_2_first_row = row;
    }

    public void setLastRowAdd1(int row)
    {
        field_3_last_row_add1 = row;
    }

    public void addDbcell(int cell)
    {
        if (field_5_dbcells == null)
        {
            field_5_dbcells = new IntList();
        }
        field_5_dbcells.add(cell);
    }

    public void setDbcell(int cell, int value)
    {
        field_5_dbcells.set(cell, value);
    }

    public int getFirstRow()
    {
        return field_2_first_row;
    }

    public int getLastRowAdd1()
    {
        return field_3_last_row_add1;
    }

    public int getNumDbcells()
    {
        if (field_5_dbcells == null)
        {
            return 0;
        }
        return field_5_dbcells.size();
    }

    public int getDbcellAt(int cellnum)
    {
        return field_5_dbcells.get(cellnum);
    }

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

        buffer.append("[INDEX]\n");
        buffer.append("    .firstrow       = ")
            .append(Integer.toHexString(getFirstRow())).append("\n");
        buffer.append("    .lastrowadd1    = ")
            .append(Integer.toHexString(getLastRowAdd1())).append("\n");
        for (int k = 0; k < getNumDbcells(); k++) {
            buffer.append("    .dbcell_").append(k).append(" = ")
                .append(Integer.toHexString(getDbcellAt(k))).append("\n");
        }
        buffer.append("[/INDEX]\n");
        return buffer.toString();
    }

    @Override
    public void serialize(LittleEndianOutput out) {

        out.writeInt(0);
        out.writeInt(getFirstRow());
        out.writeInt(getLastRowAdd1());
        out.writeInt(field_4_zero);
        for (int k = 0; k < getNumDbcells(); k++) {
        	out.writeInt(getDbcellAt(k));
        }
    }

    @Override
    protected int getDataSize() {
        return 16 // 4 ints
        	+ getNumDbcells() * 4;
    }
    
    
Params:
blockCount – the number of blocks to be indexed
Returns:
the size of an IndexRecord when it needs to index the specified number of blocks/** 
     * @param blockCount the number of blocks to be indexed
     * @return the size of an IndexRecord when it needs to index the specified number of blocks
     */
    public static int getRecordSizeForBlockCount(int blockCount) {
        return 20 + 4 * blockCount;
    }  

    @Override
    public short getSid() {
        return sid;
    }

    @Override
    public IndexRecord clone() {
      IndexRecord rec = new IndexRecord();
      rec.field_2_first_row = field_2_first_row;
      rec.field_3_last_row_add1 = field_3_last_row_add1;
      rec.field_4_zero = field_4_zero;
      rec.field_5_dbcells = new IntList();
      rec.field_5_dbcells.addAll(field_5_dbcells);
      return rec;
    }
}