TagInfo (JSP 2.3 API Documentation - Apache Tomcat 9.0.118)
Description: declaration: package: javax.servlet.jsp.tagext, class: TagInfo

# Class TagInfo

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

public class TagInfo extends 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.

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `BODY_CONTENT_EMPTY`
  Static constant for getBodyContent() when it is empty.
  `static final String`
  `BODY_CONTENT_JSP`
  Static constant for getBodyContent() when it is JSP.
  `static final String`
  `BODY_CONTENT_SCRIPTLESS`
  Static constant for getBodyContent() when it is scriptless.
  `static final String`
  `BODY_CONTENT_TAG_DEPENDENT`
  Static constant for getBodyContent() when it is Tag dependent.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `TagInfo(String tagName, String tagClassName, String bodycontent, String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo)`
  Constructor for TagInfo from data in the JSP 1.1 format for TLD.
  `TagInfo(String tagName, String tagClassName, String bodycontent, String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo, String displayName, String smallIcon, String largeIcon, TagVariableInfo[] tvi)`
  Constructor for TagInfo from data in the JSP 1.2 format for TLD.
  `TagInfo(String tagName, String tagClassName, String bodycontent, String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo, String displayName, String smallIcon, String largeIcon, TagVariableInfo[] tvi, boolean dynamicAttributes)`
  Constructor for TagInfo from data in the JSP 2.0 format for TLD.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `TagAttributeInfo[]`
  `getAttributes()`
  Attribute information (in the TLD) on this tag.
  `String`
  `getBodyContent()`
  The bodycontent information for this tag.
  `String`
  `getDisplayName()`
  Get the displayName.
  `String`
  `getInfoString()`
  The information string for the tag.
  `String`
  `getLargeIcon()`
  Get the path to the large icon.
  `String`
  `getSmallIcon()`
  Get the path to the small icon.
  `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.
  `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`
  `hasDynamicAttributes()`
  Get dynamicAttributes associated with this TagInfo.
  `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.
  `ValidationMessage[]`
  `validate(TagData data)`
  Translation-time validation of the attributes.

  ### Methods inherited from class Object

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

- ## Field Details

  - ### BODY_CONTENT_JSP

    public static final String BODY_CONTENT_JSP
    Static constant for getBodyContent() when it is JSP.
    See Also:
      - Constant Field Values

  - ### BODY_CONTENT_TAG_DEPENDENT

    public static final 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 String BODY_CONTENT_EMPTY
    Static constant for getBodyContent() when it is empty.
    See Also:
      - Constant Field Values

  - ### BODY_CONTENT_SCRIPTLESS

    public static final String BODY_CONTENT_SCRIPTLESS
    Static constant for getBodyContent() when it is scriptless.
    Since:
      JSP 2.0
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### TagInfo

    public TagInfo(String tagName, String tagClassName, String bodycontent, 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 TagLibraryInfo 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(String tagName, String tagClassName, String bodycontent, String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo, String displayName, String smallIcon, 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 TagLibraryInfo 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
      `tvi` - An array of a TagVariableInfo (or null)

  - ### TagInfo

    public TagInfo(String tagName, String tagClassName, String bodycontent, String infoString, TagLibraryInfo taglib, TagExtraInfo tagExtraInfo, TagAttributeInfo[] attributeInfo, String displayName, String smallIcon, String largeIcon, TagVariableInfo[] tvi, boolean dynamicAttributes)
    Constructor for TagInfo from data in the JSP 2.0 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 TagLibraryInfo 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
      `tvi` - An array of a TagVariableInfo (or null)
      `dynamicAttributes` - True if supports dynamic attributes
    Since:
      JSP 2.0

- ## Method Details

  - ### getTagName

    public 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.
    Returns:
      The array of TagAttributeInfo for this tag, or a zero-length array if the tag has no attributes.

  - ### 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.
    Parameters:
      `data` - TagData describing this action.
    Returns:
      if a TagExtraInfo object is associated with this TagInfo, the result of getTagExtraInfo().getVariableInfo( data ), otherwise null.

  - ### 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.

  - ### validate

    public ValidationMessage[] validate(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:
      A null object, or zero length array if no errors, an array of ValidationMessages otherwise.
    Since:
      JSP 2.0

  - ### 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 String getTagClassName()
    Name of the class that provides the handler for this tag.
    Returns:
      The name of the tag handler class.

  - ### getBodyContent

    public String getBodyContent()
    The bodycontent information for this tag. If the bodycontent is not defined for this tag, the default of JSP will be returned.
    Returns:
      the body content string.

  - ### getInfoString

    public String getInfoString()
    The information string for the tag.
    Returns:
      the info string, or null if not defined

  - ### 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 tag library instance we belong to

  - ### getDisplayName

    public String getDisplayName()
    Get the displayName.
    Returns:
      A short name to be displayed by tools, or null if not defined

  - ### getSmallIcon

    public String getSmallIcon()
    Get the path to the small icon.
    Returns:
      Path to a small icon to be displayed by tools, or null if not defined

  - ### getLargeIcon

    public String getLargeIcon()
    Get the path to the large icon.
    Returns:
      Path to a large icon to be displayed by tools, or null if not defined

  - ### getTagVariableInfos

    public TagVariableInfo[] getTagVariableInfos()
    Get TagVariableInfo objects associated with this TagInfo.
    Returns:
      Array of TagVariableInfo objects corresponding to variables declared by this tag, or a zero length array if no variables have been declared

  - ### hasDynamicAttributes

    public boolean hasDynamicAttributes()
    Get dynamicAttributes associated with this TagInfo.
    Returns:
      True if tag handler supports dynamic attributes
    Since:
      JSP 2.0