poi/src/scratchpad/src/org/apache/poi/generator/FieldIterator.java

/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
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 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
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 *    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.
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 *    "Apache POI" must not be used to endorse or promote products
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 * 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.generator;

/**
 * For iterating through our fields.  Todo: Change this to javascript in the style sheet.
 *
 * @author Glen Stampoultzis (gstamp at iprimus dot com dot au)
 */
public class FieldIterator
{
    int offset;

    public FieldIterator()
    {
    }

    public void init(org.apache.xalan.extensions.XSLProcessorContext context,
                     org.apache.xalan.templates.ElemExtensionCall extElem)
    {
        offset = 0;
    }

    public String fillDecoder(String size, String type)
    {
        String javaType = RecordUtil.getType(size, type, 0);

        String result = "";
        if (javaType.equals("short"))
            result = "LittleEndian.getShort(data, " + offset + " + offset)";
        else if (javaType.equals("int"))
            result = "LittleEndian.getInt(data, " + offset + " + offset)";
        else if (javaType.equals("byte"))
            result = "data[ " + offset + " + offset ]";
        else if (javaType.equals("ExcelString"))
            result = "ExcelStringUtil.decodeExcelString(data, " + offset + " + offset)";

        try
        {
            offset += Integer.parseInt(size);
        }
        catch (NumberFormatException ignore)
        {
        }
        return result;
    }

    //position(),@name,@size,@type
    public String serialiseEncoder( int fieldNumber, String fieldName, String size, String type)
    {
        String javaType = RecordUtil.getType(size, type, 0);
        String javaFieldName = RecordUtil.getFieldName(fieldNumber,fieldName,0);

        String result = "";
        if (javaType.equals("short"))
            result = "LittleEndian.putShort(data, " + (offset+4) + " + offset, " + javaFieldName + ");";
        else if (javaType.equals("int"))
            result = "LittleEndian.putInt(data, " + (offset+4) + " + offset, " + javaFieldName + ");";
        else if (javaType.equals("byte"))
            result = "data[ " + (offset+4) + " + offset ] = " + javaFieldName + ";";
        else if (javaType.equals("ExcelString"))
            result = "StringUtil.putUncompressedUnicode(getFontName(), data, 20 + offset);";

        try
        {
            offset += Integer.parseInt(size);
        }
        catch (NumberFormatException ignore)
        {
        }
        return result;

    }

    public String calcSize( int fieldNumber, String fieldName, String size, String type)
    {
        String result = fieldNumber == 1 ? "" : " + ";
        if ("var".equals(size))
        {
            String javaFieldName = RecordUtil.getFieldName(fieldNumber,fieldName,0);
            return result + javaFieldName + ".sizeInBytes()";
        }
        else
        {
            return result + size;
        }
    }

}