org.apache.poi.ss.formula.functions
Class TextFunction

java.lang.Object
  org.apache.poi.ss.formula.functions.TextFunction

All Implemented Interfaces:

Function

public abstract class TextFunction
extends java.lang.Object
implements Function

Author:

Amol S. Deshmukh < amolweb at ya hoo dot com >, Josh Micich, Stephen Wolke (smwolke at geistig.com)

Field Summary

static Function	CHAR Returns the character specified by a number.
static Function	CLEAN An implementation of the CLEAN function: In Excel, the Clean function removes all non-printable characters from a string.
static Function	CONCATENATE
protected static java.lang.String	EMPTY_STRING
static Function	EXACT
static Function	FIND Implementation of the FIND() function. Syntax: FIND(find_text, within_text, start_num) FIND returns the character position of the first (case sensitive) occurrence of find_text inside within_text.
protected static DataFormatter	formatter
static Function	LEFT
static Function	LEN
static Function	LOWER
static Function	MID An implementation of the MID function MID returns a specific number of characters from a text string, starting at the specified position. Syntax: MID(text, start_num, num_chars) Author: Manda Wilson < wilson at c bio dot msk cc dot org >
static Function	RIGHT
static Function	SEARCH Implementation of the FIND() function. Syntax: SEARCH(find_text, within_text, start_num) SEARCH is a case-insensitive version of FIND()
static Function	TEXT An implementation of the TEXT function TEXT returns a number value formatted with the given number formatting string.
static Function	TRIM An implementation of the TRIM function: Removes leading and trailing spaces from value if evaluated operand value is string.
static Function	UPPER

Constructor Summary

TextFunction()

Method Summary

ValueEval	evaluate(ValueEval[] args, int srcCellRow, int srcCellCol)
protected static double	evaluateDoubleArg(ValueEval arg, int srcCellRow, int srcCellCol)
protected abstract ValueEval	evaluateFunc(ValueEval[] args, int srcCellRow, int srcCellCol)
protected static int	evaluateIntArg(ValueEval arg, int srcCellRow, int srcCellCol)
protected static java.lang.String	evaluateStringArg(ValueEval eval, int srcRow, int srcCol)

Methods inherited from class java.lang.Object

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

Field Detail

formatter

protected static final DataFormatter formatter

EMPTY_STRING

protected static final java.lang.String EMPTY_STRING

See Also:

Constant Field Values

CHAR

public static final Function CHAR

Returns the character specified by a number.

LEN

public static final Function LEN

LOWER

public static final Function LOWER

UPPER

public static final Function UPPER

TRIM

public static final Function TRIM

An implementation of the TRIM function: Removes leading and trailing spaces from value if evaluated operand value is string. Author: Manda Wilson < wilson at c bio dot msk cc dot org >

CLEAN

public static final Function CLEAN

An implementation of the CLEAN function: In Excel, the Clean function removes all non-printable characters from a string. Author: Aniket Banerjee(banerjee@google.com)

MID

public static final Function MID

An implementation of the MID function
MID returns a specific number of characters from a text string, starting at the specified position.

Syntax:
MID(text, start_num, num_chars)
Author: Manda Wilson < wilson at c bio dot msk cc dot org >

LEFT

public static final Function LEFT

RIGHT

public static final Function RIGHT

CONCATENATE

public static final Function CONCATENATE

EXACT

public static final Function EXACT

TEXT

public static final Function TEXT

An implementation of the TEXT function
TEXT returns a number value formatted with the given number formatting string. This function is not a complete implementation of the Excel function, but handles most of the common cases. All work is passed down to DataFormatter to be done, as this works much the same as the display focused work that that does. Syntax:
TEXT(value, format_text)

FIND

public static final Function FIND

Implementation of the FIND() function.

Syntax:
FIND(find_text, within_text, start_num)

FIND returns the character position of the first (case sensitive) occurrence of find_text inside within_text. The third parameter, start_num, is optional (default=1) and specifies where to start searching from. Character positions are 1-based.

Author: Torstein Tauno Svendsen (torstei@officenet.no)

SEARCH

public static final Function SEARCH

Implementation of the FIND() function.

Syntax:
SEARCH(find_text, within_text, start_num)

SEARCH is a case-insensitive version of FIND()

Constructor Detail

TextFunction

public TextFunction()

Method Detail

evaluateStringArg

protected static final java.lang.String evaluateStringArg(ValueEval eval,
                                                          int srcRow,
                                                          int srcCol)
                                                   throws EvaluationException

Throws:

EvaluationException

evaluateIntArg

protected static final int evaluateIntArg(ValueEval arg,
                                          int srcCellRow,
                                          int srcCellCol)
                                   throws EvaluationException

Throws:

EvaluationException

evaluateDoubleArg

protected static final double evaluateDoubleArg(ValueEval arg,
                                                int srcCellRow,
                                                int srcCellCol)
                                         throws EvaluationException

Throws:

EvaluationException

evaluate

public final ValueEval evaluate(ValueEval[] args,
                                int srcCellRow,
                                int srcCellCol)

Specified by:

evaluate in interface Function

Parameters:

args - the evaluated function arguments. Empty values are represented with BlankEval or MissingArgEval, never null.

srcCellRow - row index of the cell containing the formula under evaluation

srcCellCol - column index of the cell containing the formula under evaluation

Returns:

The evaluated result, possibly an ErrorEval, never null. Note - Excel uses the error code #NUM! instead of IEEE NaN, so when numeric functions evaluate to Double.NaN be sure to translate the result to ErrorEval.NUM_ERROR.

evaluateFunc

protected abstract ValueEval evaluateFunc(ValueEval[] args,
                                          int srcCellRow,
                                          int srcCellCol)
                                   throws EvaluationException

Throws:

EvaluationException