/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved.
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 * 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
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 *    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
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 * 5. Products derived from this software may not be called "Apache",
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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/>.
 */

/*
 * ValueReferencePtg.java
 *
 * Created on November 21, 2001, 5:27 PM
 */
package org.apache.poi.hssf.record.formula;

import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.BitField;

import org.apache.poi.hssf.util.ReferenceUtil;

/**
 * ValueReferencePtg - handles references (such as A1, A2, IA4) - Should also
 * be made to handle relative versus absolute references but I don't know enough
 * about using them in excel to know if its correct.  Seems inverted to me.  
 * FIXME = correct abs vs relative references
 * @author  Andrew C. Oliver (acoliver@apache.org)
 */

public class ReferencePtg extends Ptg
{
    private final static int SIZE = 5;
    public final static byte sid  = 0x24;
    private short            field_1_row;
    private short            field_2_col;
    private BitField         rowRelative = new BitField(0x8000);
    private BitField         colRelative = new BitField(0x4000);

    
    
    /**
     * Takes in a String represnetation of a cell reference and fills out the 
     * numeric fields.
     */
    protected ReferencePtg(String cellref) {
        int[] xy = ReferenceUtil.getXYFromReference(cellref);
        setRow((short)xy[0]);
        setColumn((short)xy[1]);
        setColRelative(true);
        setRowRelative(true);
    }

    /** Creates new ValueReferencePtg */

    public ReferencePtg(byte[] data, int offset)
    {
        offset++;   // adjust for ptg
        field_1_row = LittleEndian.getShort(data, offset + 0);
        field_2_col = LittleEndian.getShort(data, offset + 2);

    }

    public String toString()
    {
        StringBuffer buffer = new StringBuffer("[ValueReferencePtg]\n");

        buffer.append("row = ").append(getRow()).append("\n");
        buffer.append("col = ").append(getColumnRaw()).append("\n");
        buffer.append("rowrelative = ").append(isRowRelative()).append("\n");
        buffer.append("colrelative = ").append(isColRelative()).append("\n");
        return buffer.toString();
    }

    public void writeBytes(byte [] array, int offset)
    {
        array[offset] = sid;
        LittleEndian.putShort(array,offset+1,field_1_row);
        LittleEndian.putShort(array,offset+3,field_2_col);
    }

    public void setRow(short row)
    {
        field_1_row = row;
    }

    public short getRow()
    {
        return field_1_row;
    }

    public boolean isRowRelative()
    {
        return rowRelative.isSet(field_2_col);
    }
    
    public void setRowRelative(boolean rel) {
        field_2_col=rowRelative.setShortBoolean(field_2_col,rel);
    }
    
    public boolean isColRelative()
    {
        return colRelative.isSet(field_2_col);
    }
    
    public void setColRelative(boolean rel) {
        field_2_col=colRelative.setShortBoolean(field_2_col,rel);
    }

    public void setColumnRaw(short col)
    {
        field_2_col = col;
    }

    public short getColumnRaw()
    {
        return field_2_col;
    }

    public void setColumn(short col)
    {
        field_2_col = col;   // fix this
    }

    public short getColumn()
    {
        return rowRelative.setShortBoolean(colRelative.setShortBoolean(field_2_col,false),false);
    }

    public int getSize()
    {
        return SIZE;
    }

    public String toFormulaString()
    {
        return ReferenceUtil.getReferenceFromXY(getRow(),getColumn());
    }
}