javax.servlet.jsp.tagext
Class TagInfo

java.lang.Object
  javax.servlet.jsp.tagext.TagInfo

public class TagInfo

extends java.lang.Object

Tag information for a tag in a Tag Library; This class is instantiated from the Tag Library Descriptor file (TLD) and is available only at translation time.

Class-Level Live Code Examples:
Code examples whose scope spans several methods in this class belong here. Code examples that illustrate how to use specific constructors and methods are found in the Constructor Detail and Method Detail sections below.

Field Summary

static java.lang.String	BODY_CONTENT_EMPTY static constant for getBodyContent() when it is empty
static java.lang.String	BODY_CONTENT_JSP static constant for getBodyContent() when it is JSP
static java.lang.String	BODY_CONTENT_TAG_DEPENDENT static constant for getBodyContent() when it is Tag dependent

Constructor Summary

TagInfo(java.lang.String tagName, java.lang.String tagClassName, java.lang.String bodycontent, java.lang.String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo)
Constructor for TagInfo from data in the JSP 1.1 format for TLD.

TagInfo(java.lang.String tagName, java.lang.String tagClassName, java.lang.String bodycontent, java.lang.String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo, java.lang.String displayName, java.lang.String smallIcon, java.lang.String largeIcon, TagVariableInfo[] tvi)
Constructor for TagInfo from data in the JSP 1.2 format for TLD.

Method Summary

TagAttributeInfo[]	getAttributes() Attribute information (in the TLD) on this tag.
java.lang.String	getBodyContent() The bodycontent information for this tag.
java.lang.String	getDisplayName() Get the displayName
java.lang.String	getInfoString() The information string for the tag.
java.lang.String	getLargeIcon() Get the path to the large icon
java.lang.String	getSmallIcon() Get the path to the small icon
java.lang.String	getTagClassName() Name of the class that provides the handler for this tag.
TagExtraInfo	getTagExtraInfo() The instance (if any) for extra tag information
TagLibraryInfo	getTagLibrary() The instance of TabLibraryInfo we belong to.
java.lang.String	getTagName() The name of the Tag.
TagVariableInfo[]	getTagVariableInfos() Get TagVariableInfo objects associated with this TagInfo
VariableInfo[]	getVariableInfo(TagData data) Information on the scripting objects created by this tag at runtime.
boolean	isValid(TagData data) Translation-time validation of the attributes.
void	setTagExtraInfo(TagExtraInfo tei) Set the instance for extra tag information
void	setTagLibrary(TagLibraryInfo tl) Set the TagLibraryInfo property.
java.lang.String	toString() Stringify for debug purposes...

Methods inherited from class java.lang.Object

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

Field Detail

BODY_CONTENT_JSP

public static final java.lang.String BODY_CONTENT_JSP

static constant for getBodyContent() when it is JSP

See Also:

Constant Field Values

BODY_CONTENT_TAG_DEPENDENT

public static final java.lang.String BODY_CONTENT_TAG_DEPENDENT

static constant for getBodyContent() when it is Tag dependent

See Also:

Constant Field Values

BODY_CONTENT_EMPTY

public static final java.lang.String BODY_CONTENT_EMPTY

static constant for getBodyContent() when it is empty

See Also:

Constant Field Values

Constructor Detail

TagInfo

public TagInfo(java.lang.String tagName,
               java.lang.String tagClassName,
               java.lang.String bodycontent,
               java.lang.String infoString,
               TagLibraryInfo taglib,
               TagExtraInfo tagExtraInfo,
               TagAttributeInfo[] attributeInfo)

Constructor for TagInfo from data in the JSP 1.1 format for TLD. This class is to be instantiated only from the TagLibrary code under request from some JSP code that is parsing a TLD (Tag Library Descriptor). Note that, since TagLibibraryInfo reflects both TLD information and taglib directive information, a TagInfo instance is dependent on a taglib directive. This is probably a design error, which may be fixed in the future.

Parameters:

tagName - The name of this tag

tagClassName - The name of the tag handler class

bodycontent - Information on the body content of these tags

infoString - The (optional) string information for this tag

taglib - The instance of the tag library that contains us.

tagExtraInfo - The instance providing extra Tag info. May be null

attributeInfo - An array of AttributeInfo data from descriptor. May be null;

TagInfo

public TagInfo(java.lang.String tagName,
               java.lang.String tagClassName,
               java.lang.String bodycontent,
               java.lang.String infoString,
               TagLibraryInfo taglib,
               TagExtraInfo tagExtraInfo,
               TagAttributeInfo[] attributeInfo,
               java.lang.String displayName,
               java.lang.String smallIcon,
               java.lang.String largeIcon,
               TagVariableInfo[] tvi)

Constructor for TagInfo from data in the JSP 1.2 format for TLD. This class is to be instantiated only from the TagLibrary code under request from some JSP code that is parsing a TLD (Tag Library Descriptor). Note that, since TagLibibraryInfo reflects both TLD information and taglib directive information, a TagInfo instance is dependent on a taglib directive. This is probably a design error, which may be fixed in the future.

Parameters:

tagName - The name of this tag

tagClassName - The name of the tag handler class

bodycontent - Information on the body content of these tags

infoString - The (optional) string information for this tag

taglib - The instance of the tag library that contains us.

tagExtraInfo - The instance providing extra Tag info. May be null

attributeInfo - An array of AttributeInfo data from descriptor. May be null;

displayName - A short name to be displayed by tools

smallIcon - Path to a small icon to be displayed by tools

largeIcon - Path to a large icon to be displayed by tools

Method Detail

getTagName

public java.lang.String getTagName()

The name of the Tag.

Returns:

The (short) name of the tag.

getAttributes

public TagAttributeInfo[] getAttributes()

Attribute information (in the TLD) on this tag. The return is an array describing the attributes of this tag, as indicated in the TLD. A null return means no attributes.

Returns:

The array of TagAttributeInfo for this tag.

getVariableInfo

public VariableInfo[] getVariableInfo(TagData data)

Information on the scripting objects created by this tag at runtime. This is a convenience method on the associated TagExtraInfo class.

Default is null if the tag has no "id" attribute, otherwise, {"id", Object}

Parameters:

data - TagData describing this action.

Returns:

Array of VariableInfo elements.

isValid

public boolean isValid(TagData data)

Translation-time validation of the attributes. This is a convenience method on the associated TagExtraInfo class.

Parameters:

data - The translation-time TagData instance.

Returns:

Whether the data is valid.

setTagExtraInfo

public void setTagExtraInfo(TagExtraInfo tei)

Set the instance for extra tag information

Parameters:

tei - the TagExtraInfo instance

getTagExtraInfo

public TagExtraInfo getTagExtraInfo()

The instance (if any) for extra tag information

Returns:

The TagExtraInfo instance, if any.

getTagClassName

public java.lang.String getTagClassName()

Name of the class that provides the handler for this tag.

Returns:

The name of the tag handler class.

getBodyContent

public java.lang.String getBodyContent()

The bodycontent information for this tag.

Returns:

the body content string.

getInfoString

public java.lang.String getInfoString()

The information string for the tag.

Returns:

the info string

setTagLibrary

public void setTagLibrary(TagLibraryInfo tl)

Set the TagLibraryInfo property. Note that a TagLibraryInfo element is dependent not just on the TLD information but also on the specific taglib instance used. This means that a fair amount of work needs to be done to construct and initialize TagLib objects. If used carefully, this setter can be used to avoid having to create new TagInfo elements for each taglib directive.

Parameters:

tl - the TagLibraryInfo to assign

getTagLibrary

public TagLibraryInfo getTagLibrary()

The instance of TabLibraryInfo we belong to.

Returns:

the tab library instance we belong to.

getDisplayName

public java.lang.String getDisplayName()

Get the displayName

Returns:

A short name to be displayed by tools

getSmallIcon

public java.lang.String getSmallIcon()

Get the path to the small icon

Returns:

Path to a small icon to be displayed by tools

getLargeIcon

public java.lang.String getLargeIcon()

Get the path to the large icon

Returns:

Path to a large icon to be displayed by tools

getTagVariableInfos

public TagVariableInfo[] getTagVariableInfos()

Get TagVariableInfo objects associated with this TagInfo

Returns:

A TagVariableInfo object associated with this

toString

public java.lang.String toString()

Stringify for debug purposes...