org.apache.poi.ss.formula.ptg
Class AbstractFunctionPtg

java.lang.Object
  org.apache.poi.ss.formula.ptg.Ptg
      org.apache.poi.ss.formula.ptg.OperationPtg
          org.apache.poi.ss.formula.ptg.AbstractFunctionPtg

Direct Known Subclasses:

FuncPtg, FuncVarPtg

public abstract class AbstractFunctionPtg
extends OperationPtg

This class provides the base functionality for Excel sheet functions There are two kinds of function Ptgs - tFunc and tFuncVar Therefore, this class will have ONLY two subclasses

Author:

Avik Sengupta, Andrew C. Oliver (acoliver at apache dot org)

Field Summary

static java.lang.String

FUNCTION_NAME_IF The name of the IF function (i.e.

Fields inherited from class org.apache.poi.ss.formula.ptg.OperationPtg

TYPE_BINARY, TYPE_FUNCTION, TYPE_UNARY

Fields inherited from class org.apache.poi.ss.formula.ptg.Ptg

CLASS_ARRAY, CLASS_REF, CLASS_VALUE, EMPTY_PTG_ARRAY

Constructor Summary

protected

AbstractFunctionPtg(int functionIndex, int pReturnClass, byte[] paramTypes, int nParams)

Method Summary

byte	getDefaultOperandClass()
short	getFunctionIndex()
java.lang.String	getName()
int	getNumberOfOperands() The number of operands expected by the operations
byte	getParameterClass(int index)
abstract int	getSize()
boolean	isBaseToken()
static boolean	isBuiltInFunctionName(java.lang.String name) Used to detect whether a function name found in a formula is one of the standard excel functions
boolean	isExternalFunction() external functions get some special processing
protected static short	lookupIndex(java.lang.String name) Resolves internal function names into function indexes.
protected java.lang.String	lookupName(short index)
java.lang.String	toFormulaString() return a string representation of this token alone
java.lang.String	toFormulaString(java.lang.String[] operands) returns a string representation of the operations the length of the input array should equal the number returned by
java.lang.String	toString() Overridden toString method to ensure object hash is not printed.

Methods inherited from class org.apache.poi.ss.formula.ptg.Ptg

createPtg, doesFormulaReferToDeletedCell, getEncodedSize, getEncodedSizeWithoutArrayData, getPtgClass, getRVAType, readTokens, serializePtgs, setClass, write

Methods inherited from class java.lang.Object

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

Field Detail

FUNCTION_NAME_IF

public static final java.lang.String FUNCTION_NAME_IF

The name of the IF function (i.e. "IF"). Extracted as a constant for clarity.

See Also:

Constant Field Values

Constructor Detail

AbstractFunctionPtg

protected AbstractFunctionPtg(int functionIndex,
                              int pReturnClass,
                              byte[] paramTypes,
                              int nParams)

Method Detail

isBaseToken

public final boolean isBaseToken()

Specified by:

isBaseToken in class Ptg

Returns:

false if this token is classified as 'reference', 'value', or 'array'

toString

public final java.lang.String toString()

Description copied from class: Ptg

Overridden toString method to ensure object hash is not printed. This helps get rid of gratuitous diffs when comparing two dumps Subclasses may output more relevant information by overriding this method

Overrides:

toString in class Ptg

getFunctionIndex

public final short getFunctionIndex()

getNumberOfOperands

public final int getNumberOfOperands()

Description copied from class: OperationPtg

The number of operands expected by the operations

Specified by:

getNumberOfOperands in class OperationPtg

getName

public final java.lang.String getName()

isExternalFunction

public final boolean isExternalFunction()

external functions get some special processing

Returns:

true if this is an external function

toFormulaString

public final java.lang.String toFormulaString()

Description copied from class: Ptg

return a string representation of this token alone

Specified by:

toFormulaString in class Ptg

toFormulaString

public java.lang.String toFormulaString(java.lang.String[] operands)

Description copied from class: OperationPtg

returns a string representation of the operations the length of the input array should equal the number returned by

Specified by:

toFormulaString in class OperationPtg

See Also:

OperationPtg.getNumberOfOperands()

getSize

public abstract int getSize()

Specified by:

getSize in class Ptg

Returns:

the encoded length of this Ptg, including the initial Ptg type identifier byte.

isBuiltInFunctionName

public static final boolean isBuiltInFunctionName(java.lang.String name)

Used to detect whether a function name found in a formula is one of the standard excel functions

The name matching is case insensitive.

Returns:

true if the name specifies a standard worksheet function, false if the name should be assumed to be an external function.

lookupName

protected final java.lang.String lookupName(short index)

lookupIndex

protected static short lookupIndex(java.lang.String name)

Resolves internal function names into function indexes.

The name matching is case insensitive.

Returns:

the standard worksheet function index if found, otherwise FUNCTION_INDEX_EXTERNAL

getDefaultOperandClass

public byte getDefaultOperandClass()

Overrides:

getDefaultOperandClass in class OperationPtg

getParameterClass

public final byte getParameterClass(int index)