org.apache.poi.ss.formula
Class Formula

java.lang.Object
  org.apache.poi.ss.formula.Formula

public class Formula
extends java.lang.Object

Encapsulates an encoded formula token array.

Author:

Josh Micich

Method Summary

Formula	copy()
static Formula	create(Ptg[] ptgs) Creates a Formula object from a supplied Ptg array.
int	getEncodedSize()
int	getEncodedTokenSize() This method is often used when the formula length does not appear immediately before the encoded token data.
CellReference	getExpReference() Gets the locator for the corresponding SharedFormulaRecord, ArrayRecord or TableRecord if this formula belongs to such a grouping.
Ptg[]	getTokens()
static Ptg[]	getTokens(Formula formula) Gets the Ptg array from the supplied Formula.
boolean	isSame(Formula other)
static Formula	read(int encodedTokenLen, LittleEndianInput in) Convenience method for read(int, LittleEndianInput, int)
static Formula	read(int encodedTokenLen, LittleEndianInput in, int totalEncodedLen) When there are no array constants present, encodedTokenLen==totalEncodedLen
void	serialize(LittleEndianOutput out) Writes The formula encoding is includes: ushort tokenDataLen tokenData arrayConstantData (if present)
void	serializeArrayConstantData(LittleEndianOutput out)
void	serializeTokens(LittleEndianOutput out)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

read

public static Formula read(int encodedTokenLen,
                           LittleEndianInput in)

Convenience method for read(int, LittleEndianInput, int)

read

public static Formula read(int encodedTokenLen,
                           LittleEndianInput in,
                           int totalEncodedLen)

When there are no array constants present, encodedTokenLen==totalEncodedLen

Parameters:

encodedTokenLen - number of bytes in the stream taken by the plain formula tokens

totalEncodedLen - the total number of bytes in the formula (includes trailing encoding for array constants, but does not include 2 bytes for initial ushort encodedTokenLen field.

Returns:

A new formula object as read from the stream. Possibly empty, never null.

getTokens

public Ptg[] getTokens()

serialize

public void serialize(LittleEndianOutput out)

Writes The formula encoding is includes:

• ushort tokenDataLen
• tokenData
• arrayConstantData (if present)

serializeTokens

public void serializeTokens(LittleEndianOutput out)

serializeArrayConstantData

public void serializeArrayConstantData(LittleEndianOutput out)

getEncodedSize

public int getEncodedSize()

Returns:

total formula encoding length. The formula encoding includes:

• ushort tokenDataLen
• tokenData
• arrayConstantData (optional)

Note - this value is different to tokenDataLength

getEncodedTokenSize

public int getEncodedTokenSize()

This method is often used when the formula length does not appear immediately before the encoded token data.

Returns:

the encoded length of the plain formula tokens. This does not include the leading ushort field, nor any trailing array constant data.

create

public static Formula create(Ptg[] ptgs)

Creates a Formula object from a supplied Ptg array. Handles nulls OK.

Parameters:

ptgs - may be null

Returns:

Never null (Possibly empty if the supplied ptgs is null)

getTokens

public static Ptg[] getTokens(Formula formula)

Gets the Ptg array from the supplied Formula. Handles nulls OK.

Parameters:

formula - may be null

Returns:

possibly null (if the supplied formula is null)

copy

public Formula copy()

getExpReference

public CellReference getExpReference()

Gets the locator for the corresponding SharedFormulaRecord, ArrayRecord or TableRecord if this formula belongs to such a grouping. The CellReference returned by this method will match the top left corner of the range of that grouping. The return value is usually not the same as the location of the cell containing this formula.

Returns:

the firstRow & firstColumn of an array formula or shared formula that this formula belongs to. null if this formula is not part of an array or shared formula.

isSame

public boolean isSame(Formula other)