Package jakarta.servlet.jsp.tagext
Class TagData
java.lang.Object
jakarta.servlet.jsp.tagext.TagData
- All Implemented Interfaces:
- Cloneable
The (translation-time only) attribute/value information for a tag instance.
 
TagData is only used as an argument to the isValid, validate, and getVariableInfo methods of TagExtraInfo, which are invoked at translation time.
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Field SummaryFieldsModifier and TypeFieldDescriptionstatic final ObjectDistinguished value for an attribute to indicate its value is a request-time expression (which is not yet available because TagData instances are used at translation-time).
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Constructor SummaryConstructors
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Method SummaryModifier and TypeMethodDescriptiongetAttribute(String attName) The value of the attribute.Enumerates the attributes.getAttributeString(String attName) Get the value for a given attribute.getId()The value of the tag's id attribute.voidsetAttribute(String attName, Object value) Set the value of an attribute.
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Field Details- 
REQUEST_TIME_VALUEDistinguished value for an attribute to indicate its value is a request-time expression (which is not yet available because TagData instances are used at translation-time).
 
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Constructor Details- 
TagDataConstructor for TagData.A typical constructor may be static final Object[][] att = { { "connection", "conn0" }, { "id", "query0" } }; static final TagData td = new TagData(att);All values must be Strings except for those holding the distinguished object REQUEST_TIME_VALUE.- Parameters:
- atts- the static attribute and values. May be null.
 
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TagDataConstructor for a TagData. If you already have the attributes in a hashtable, use this constructor.- Parameters:
- attrs- A hashtable to get the values from.
 
 
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Method Details- 
getIdThe value of the tag's id attribute.- Returns:
- the value of the tag's id attribute, or null if no such attribute was specified.
 
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getAttributeThe value of the attribute. If a static value is specified for an attribute that accepts a request-time attribute expression then that static value is returned, even if the value is provided in the body of a <jsp:attribute> action. The distinguished object REQUEST_TIME_VALUE is only returned if the value is specified as a request-time attribute expression or via the <jsp:attribute> action with a body that contains dynamic content (scriptlets, scripting expressions, EL expressions, standard actions, or custom actions). Returns null if the attribute is not set.- Parameters:
- attName- the name of the attribute
- Returns:
- the attribute's value
 
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setAttributeSet the value of an attribute.- Parameters:
- attName- the name of the attribute
- value- the value.
 
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getAttributeStringGet the value for a given attribute.- Parameters:
- attName- the name of the attribute
- Returns:
- the attribute value string
- Throws:
- ClassCastException- if attribute value is not a String
 
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getAttributesEnumerates the attributes.- Returns:
- An enumeration of the attributes in a TagData
 
 
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