/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache POI" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache POI", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.poi.hssf.record;

import org.apache.poi.util.LittleEndian;

import java.util.ArrayList;

/**
 * Title:        Extended Static String Table<P>
 * Description:  I really don't understand this thing... its supposed to be "a hash
 *               table for optimizing external copy operations"  --
 *<P>
 *               This sounds like a job for Marc "BitMaster" Johnson aka the
 *               "Hawaiian Master Chef".<P>
 * REFERENCE:  PG 313 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P>
 * @author Andrew C. Oliver (acoliver at apache dot org)
 * @version 2.0-pre
 * @see org.apache.poi.hssf.record.ExtSSTInfoSubRecord
 */

public class ExtSSTRecord
    extends Record
{
    public final static short sid = 0xff;
    private short             field_1_strings_per_bucket;
    private ArrayList         field_2_sst_info;


    public ExtSSTRecord()
    {
        field_2_sst_info = new ArrayList();
    }

    /**
     * Constructs a EOFRecord record and sets its fields appropriately.
     *
     * @param id     id must be 0xff or an exception will be throw upon validation
     * @param size  the size of the data area of the record
     * @param data  data of the record (should not contain sid/len)
     */

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

    /**
     * Constructs a EOFRecord record and sets its fields appropriately.
     *
     * @param id     id must be 0xff or an exception will be throw upon validation
     * @param size  the size of the data area of the record
     * @param data  data of the record (should not contain sid/len)
     * @param offset of the record's data
     */

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

    protected void validateSid(short id)
    {
        if (id != sid)
        {
            throw new RecordFormatException("NOT An EXTSST RECORD");
        }
    }

    // this probably doesn't work but we don't really care at this point
    protected void fillFields(byte [] data, short size, int offset)
    {
        field_2_sst_info           = new ArrayList();
        field_1_strings_per_bucket = LittleEndian.getShort(data, 0 + offset);
        for (int k = 2; k < ((data.length - offset) - size); k += 8)
        {
            byte[] tempdata = new byte[ 8 + offset ];

            System.arraycopy(data, k, tempdata, 0, 8);
            ExtSSTInfoSubRecord rec = new ExtSSTInfoSubRecord(( short ) 0,
                                          ( short ) 8, tempdata);

            field_2_sst_info.add(rec);
        }
    }

    public void setNumStringsPerBucket(short numStrings)
    {
        field_1_strings_per_bucket = numStrings;
    }

    public void addInfoRecord(ExtSSTInfoSubRecord rec)
    {
        field_2_sst_info.add(rec);
    }

    public short getNumStringsPerBucket()
    {
        return field_1_strings_per_bucket;
    }

    public int getNumInfoRecords()
    {
        return field_2_sst_info.size();
    }

    public ExtSSTInfoSubRecord getInfoRecordAt(int elem)
    {
        return ( ExtSSTInfoSubRecord ) field_2_sst_info.get(elem);
    }

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

        buffer.append("[EXTSST]\n");
        buffer.append("    .dsst           = ")
            .append(Integer.toHexString(getNumStringsPerBucket()))
            .append("\n");
        buffer.append("    .numInfoRecords = ").append(getNumInfoRecords())
            .append("\n");
        for (int k = 0; k < getNumInfoRecords(); k++)
        {
            buffer.append("    .inforecord     = ").append(k).append("\n");
            buffer.append("    .streampos      = ")
                .append(Integer
                .toHexString(getInfoRecordAt(k).getStreamPos())).append("\n");
            buffer.append("    .sstoffset      = ")
                .append(Integer
                .toHexString(getInfoRecordAt(k).getBucketSSTOffset()))
                    .append("\n");
        }
        buffer.append("[/EXTSST]\n");
        return buffer.toString();
    }

    public int serialize(int offset, byte [] data)
    {
        LittleEndian.putShort(data, 0 + offset, sid);
        LittleEndian.putShort(data, 2 + offset, (short)(getRecordSize() - 4));
        LittleEndian.putShort(data, 4 + offset, field_1_strings_per_bucket);
        int pos = 6;

        for (int k = 0; k < getNumInfoRecords(); k++)
        {
            System.arraycopy(getInfoRecordAt(k).serialize(), 0, data,
                             pos + offset, 8);
            pos += getInfoRecordAt(k).getRecordSize();
        }
        return getRecordSize();
    }

    public int getRecordSize()
    {
        return 4 + 2 + field_2_sst_info.size() * 8;
    }

    public short getSid()
    {
        return sid;
    }

    public void setBucketOffsets( int[] bucketAbsoluteOffsets, int[] bucketRelativeOffsets )
    {
        this.field_2_sst_info = new ArrayList(bucketAbsoluteOffsets.length);
        for ( int i = 0; i < bucketAbsoluteOffsets.length; i++ )
        {
            ExtSSTInfoSubRecord r = new ExtSSTInfoSubRecord();
            r.setBucketRecordOffset((short)bucketRelativeOffsets[i]);
            r.setStreamPos(bucketAbsoluteOffsets[i]);
            field_2_sst_info.add(r);
        }
    }

}