org.chwf.taglib.jutil
Class IfTag

java.lang.Object
  |
  +--javax.servlet.jsp.tagext.TagSupport
        |
        +--org.chwf.taglib.base.LifeCycleTagSupport
              |
              +--org.chwf.taglib.base.ObjectTagSupport
                    |
                    +--org.chwf.taglib.jutil.IfTag

All Implemented Interfaces:

Parameterized, java.io.Serializable, javax.servlet.jsp.tagext.Tag

Direct Known Subclasses:

ElseIfTag, ElseTag

public class IfTag

extends ObjectTagSupport

Tag handler for the <if> tag.

Author:

Paul Strack

See Also:

Serialized Form

Field Summary

static java.lang.String

LAST_IF_RESULT Constant storing the last test result.

Fields inherited from class org.chwf.taglib.base.ObjectTagSupport

DEFAULT_OBJECT

Fields inherited from class javax.servlet.jsp.tagext.TagSupport

id, pageContext

Fields inherited from interface javax.servlet.jsp.tagext.Tag

EVAL_BODY_INCLUDE, EVAL_PAGE, SKIP_BODY, SKIP_PAGE

Constructor Summary

IfTag()

Method Summary

void	cleanup() Clean up data for tag handler reuse and pooling.
int	doEnd() Initialize LAST_IF_RESULT.
int	doStart() Evaluates test property and conditionally executes body.
boolean	getTestResult() Get results of test.
void	setEl(java.lang.String el) Calls superclass method.
void	setObject(java.lang.String objectName) Calls superclass method.
void	setProperty(java.lang.String property) Calls superclass method.

Methods inherited from class org.chwf.taglib.base.ObjectTagSupport

findObject, getEl, getObject, getProperty, getTagResult, getTagResult, getVar, setVar, storeDefaultObject

Methods inherited from class org.chwf.taglib.base.LifeCycleTagSupport

addAttribute, addParameter, doEndTag, doStartTag, getAttribute, getAttributeNames, getParameter, getParameterNames, init, printAttributes

Methods inherited from class javax.servlet.jsp.tagext.TagSupport

findAncestorWithClass, getId, getParent, getValue, getValues, release, removeValue, setId, setPageContext, setParent, setValue

Methods inherited from class java.lang.Object

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

Field Detail

LAST_IF_RESULT

public static final java.lang.String LAST_IF_RESULT

Constant storing the last test result.

Constructor Detail

IfTag

public IfTag()

Method Detail

setObject

public void setObject(java.lang.String objectName)
               throws javax.servlet.jsp.JspException

Calls superclass method. Is present here because of a bug in some servlet engines that requires tag attibute setters to be defined in the tag class itself.

Overrides:

setObject in class ObjectTagSupport

Parameters:

objectName - The object name.

Throws:

javax.servlet.jsp.JspException - For errors.

setProperty

public void setProperty(java.lang.String property)
                 throws javax.servlet.jsp.JspException

Calls superclass method. Is present here because of a bug in some servlet engines that requires tag attibute setters to be defined in the tag class itself.

Overrides:

setProperty in class ObjectTagSupport

Parameters:

property - The property name.

Throws:

javax.servlet.jsp.JspException - For errors.

setEl

public void setEl(java.lang.String el)

Calls superclass method. Is present here because of a bug in some servlet engines that requires tag attibute setters to be defined in the tag class itself.

Overrides:

setEl in class ObjectTagSupport

Parameters:

el - The JSTL Expression Language statement.

cleanup

public void cleanup()

Clean up data for tag handler reuse and pooling. Should be overridden in tag handler. Subclasses should always invoke their superclass's cleanup method: super.cleanup()

Overrides:

cleanup in class ObjectTagSupport

doStart

public int doStart()
            throws javax.servlet.jsp.JspException

Evaluates test property and conditionally executes body.

Overrides:

doStart in class LifeCycleTagSupport

Returns:

EVAL_BODY_INCLUDE If the test is true

Throws:

javax.servlet.jsp.JspException - If an exception is thrown during testing.

doEnd

public int doEnd()
          throws javax.servlet.jsp.JspException

Initialize LAST_IF_RESULT.

Overrides:

doEnd in class LifeCycleTagSupport

Returns:

EVAL_PAGE

Throws:

javax.servlet.jsp.JspException - For expression language parse errors.

getTestResult

public boolean getTestResult()
                      throws javax.servlet.jsp.JspException

Get results of test.

Returns:

true if object property evaluates to true.

Throws:

javax.servlet.jsp.JspException - For expression language parse errors.