Method Signature Description int doStartTag() This method is invoked first when a tag is encountered. int doEndTag() Invoke this method when processing the end tag. int doInitBody() Invoke this method before evaluating the tag body. BodyContent getBodyContent() Returns the current BodyContent object. JspWriter getPreviousOut() Returns the enclosing JspWriter. void release() Resets the state of the tag. void setBodyContent() Prepares for tag body evaluation. Method Signature Description int doStartTag() This method is invoked first when a tag is encountered. int doEndTag() Invoke this method when processing the end tag. int doInitBody() Invoke this method before evaluating the tag body. BodyContent getBodyContent() Returns the current BodyContent object. JspWriter getPreviousOut() Returns the enclosing JspWriter. void release() Resets the state of the tag. void setBodyContent() Prepares for tag body evaluation. The TagAttributeInfo Class This class contains information on Tag attributes found in the Tag Library Descriptor file (tld). Only the information needed to generate code is included in this reference. Additional information such as SCHEMA can be found in the complete JSP Specification (java.sun.com/products/jsp). Table A-16 lists the methods for the TagAttributeInfo class. Table A-16: Methods in the TagAttributeInfo Class Method Signature Description boolean canBeRequestTime() Indicates whether this attribute can hold a request-time value static TagAttributeInfo getIDAttribute( tagAttributeInfo[] tai ) Returns the ID attribute (if one exists) in the attribute list argument. String getName() Returns the name of the attribute. String getTypeName() Returns the type of the attribute as a string. boolean isRequired() Indicates whether this attribute is required or not. String toString() Overrides Object.toString. The TagAttributeInfo class also contains a class variable declared as follows: static final String ID = “ID” TheTagData Class The TagData class contains translation-time information for the attributes and values of a tag instance. TagData is only used as an argument to the isValid and getVariableInfo methods of TagExtraInfo, which are invoked at translation time. Table A-17 lists the methods for the TagData class. Table A-17: Methods in the TagData Class Method Signature Description Object getAttribute( String attName ) Returns the value of the attribute named attName or null if no attribute exists. String getAttributeString( String attName ) Returns the value of the attribute named attName as a string or null if no attribute exists.
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