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Apache POI - Java API To Access Microsoft Format Files
There is a newer version: 5.2.5
/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   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

   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 org.apache.poi.util.HexDump;
import org.apache.poi.util.LittleEndianOutput;
import org.apache.poi.util.StringUtil;

/**
 * Title:        Format Record (0x041E)
 * Description:  describes a number format -- those goofy strings like $(#,###)
 *
 * REFERENCE:  PG 317 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)
 */
public final class FormatRecord extends StandardRecord implements Cloneable {
    public final static short sid = 0x041E;

    private final int field_1_index_code;
    private final boolean field_3_hasMultibyte;
    private final String field_4_formatstring;

    private FormatRecord(FormatRecord other) {
        field_1_index_code = other.field_1_index_code;
        field_3_hasMultibyte = other.field_3_hasMultibyte;
        field_4_formatstring = other.field_4_formatstring;
    }
    
    public FormatRecord(int indexCode, String fs) {
        field_1_index_code = indexCode;
        field_4_formatstring = fs;
        field_3_hasMultibyte = StringUtil.hasMultibyte(fs);
    }

    public FormatRecord(RecordInputStream in) {
        field_1_index_code = in.readShort();
        int field_3_unicode_len = in.readUShort();
        field_3_hasMultibyte = (in.readByte() & 0x01) != 0;

        if (field_3_hasMultibyte) {
            field_4_formatstring = in.readUnicodeLEString(field_3_unicode_len);
        } else {
            field_4_formatstring = in.readCompressedUnicode(field_3_unicode_len);
        }
    }

    /**
     * get the format index code (for built in formats)
     *
     * @return the format index code
     * @see org.apache.poi.hssf.model.InternalWorkbook
     */
    public int getIndexCode() {
        return field_1_index_code;
    }

    /**
     * get the format string
     *
     * @return the format string
     */
    public String getFormatString() {
        return field_4_formatstring;
    }

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

        buffer.append("[FORMAT]\n");
        buffer.append("    .indexcode       = ").append(HexDump.shortToHex(getIndexCode())).append("\n");
        buffer.append("    .isUnicode       = ").append(field_3_hasMultibyte ).append("\n");
        buffer.append("    .formatstring    = ").append(getFormatString()).append("\n");
        buffer.append("[/FORMAT]\n");
        return buffer.toString();
    }

    public void serialize(LittleEndianOutput out) {
        String formatString = getFormatString();
        out.writeShort(getIndexCode());
        out.writeShort(formatString.length());
        out.writeByte(field_3_hasMultibyte ? 0x01 : 0x00);

      if ( field_3_hasMultibyte ) {
          StringUtil.putUnicodeLE( formatString, out);
      }  else {
          StringUtil.putCompressedUnicode( formatString, out);
      }
    }
    protected int getDataSize() {
        return 5 // 2 shorts + 1 byte
            + getFormatString().length() * (field_3_hasMultibyte ? 2 : 1);
    }

    public short getSid() {
        return sid;
    }
    
    @Override
    public FormatRecord clone() {
        return new FormatRecord(this);
    }
}