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## 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
`equals, 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 `null`s 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 `null`s 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)

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