net.sf.jett.tag
Class FormulaTag

java.lang.Object
  net.sf.jett.tag.BaseTag
      net.sf.jett.tag.FormulaTag

All Implemented Interfaces:

Tag

public class FormulaTag
extends BaseTag

A FormulaTag represents a dynamically generated Excel Formula. The text attribute contains formula text that may contain Expressions that are dynamically evaluated. JETT does not verify that the dynamically generated expression is a valid Excel Formula. A FormulaTag must be bodiless.

Attributes:

• Inherits all attributes from BaseTag.
• text or bean (required): String
• ifError (optional): String

Either "text" or "bean" must be specified, but not both.

Since:

0.4.0

Author:

Randy Gettman

Field Summary

static java.lang.String	ATTR_BEAN Attribute that specifies the bean name that contains the Expression string to be evaluated by JETT that results in formula creation in the cell.
static java.lang.String	ATTR_IF_ERROR Attribute that specifies the Expression string to be evaluated by JETT to be used as alternative text in case an Excel error results.
static java.lang.String	ATTR_TEXT Attribute that specifies the Expression string to be evaluated by JETT that results in formula creation in the cell.

Fields inherited from class net.sf.jett.tag.BaseTag

ATTR_ON_PROCESSED, SPEC_SEP

Constructor Summary

FormulaTag()

Method Summary

java.lang.String	getName() Returns this Tag's name.
protected java.util.List<java.lang.String>	getOptionalAttributes() Returns a List of optional attribute names.
protected java.util.List<java.lang.String>	getRequiredAttributes() Returns a List of required attribute names.
boolean	process() Evaluate the "text" attribute, and place the resultant text in an Excel Formula.
void	validateAttributes() Validates the attributes for this Tag.

Methods inherited from class net.sf.jett.tag.BaseTag

checkAttributes, clearBlock, deleteBlock, getAttributes, getContext, getWorkbookContext, isBodiless, processTag, removeBlock, setAttributes, setBodiless, setContext, setWorkbookContext

Methods inherited from class java.lang.Object

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

Field Detail

ATTR_BEAN

public static final java.lang.String ATTR_BEAN

Attribute that specifies the bean name that contains the Expression string to be evaluated by JETT that results in formula creation in the cell. I.e. bean="beanName" => "${beanName}" => "formula". Then the value is used as the formula expression, i.e. formula => "${wins} + ${losses}" => "A2 + B2", which is used as the formula text. Either "bean" or "text" must be specified, but not both.

See Also:

Constant Field Values

ATTR_TEXT

public static final java.lang.String ATTR_TEXT

Attribute that specifies the Expression string to be evaluated by JETT that results in formula creation in the cell. I.e. text="${wins} + ${losses}" => "A2 + B2", which is used as the formula text. Either "bean" or "text" must be specified, but not both.

See Also:

Constant Field Values

ATTR_IF_ERROR

public static final java.lang.String ATTR_IF_ERROR

Attribute that specifies the Expression string to be evaluated by JETT to be used as alternative text in case an Excel error results.

See Also:

Constant Field Values

Constructor Detail

FormulaTag

public FormulaTag()

Method Detail

getName

public java.lang.String getName()

Returns this Tag's name.

Returns:

This Tag's name.

getRequiredAttributes

protected java.util.List<java.lang.String> getRequiredAttributes()

Returns a List of required attribute names.

Overrides:

getRequiredAttributes in class BaseTag

Returns:

A List of required attribute names.

getOptionalAttributes

protected java.util.List<java.lang.String> getOptionalAttributes()

Returns a List of optional attribute names.

Overrides:

getOptionalAttributes in class BaseTag

Returns:

A List of optional attribute names.

validateAttributes

public void validateAttributes()
                        throws TagParseException

Validates the attributes for this Tag. This tag must be bodiless.

Overrides:

validateAttributes in class BaseTag

Throws:

TagParseException - If the attribute values are illegal or unacceptable.

process

public boolean process()

Evaluate the "text" attribute, and place the resultant text in an Excel Formula. If the "ifError" attribute is supplied, then wrap the formula in an "IF(ISERROR(formula), ifError, formula)" formula.

Specified by:

process in class BaseTag

Returns:

Whether the first Cell in the Block associated with this Tag was processed.