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package javax.servlet.jsp.tagext;
import javax.servlet.jsp.*;
/**
* The BodyTag interface extends Tag by defining additional methods that let
* a Tag handler access its body.
* <p>
* The interface provides two new methods: one is to be invoked with the BodyContent
* for the evaluation of the body, the other is to be reevaluated after every body
* evaluation.
* <p>
* Without repeating the portions described in Tag.java, a typical invocation sequence is:
*
* <pre>
* <code>
*
* -- we are picking up after all the setters have been done
* t.doStartTag();
* out = pageContext.pushBody();
* -- prepare for body
* t.setBodyContent(out);
* -- preamble
* t.doBodyInit();
* -- BODY evaluation into out
* t.doAfterBody();
* -- while doAfterBody returns EVAL_BODY_TAG we iterate
* -- BODY evaluation into out
* t.doAfterBody()
* -- done
* t.doEndTag()
*
* </code>
* </pre>
*/
public interface BodyTag extends Tag {
/**
* Request the creation of new BodyContent on which to evaluate the
* body of this tag.
* Returned from doStartTag and doAfterBody.
* This is an illegal return value for doStartTag when the class does not
* implement BodyTag, since BodyTag is needed to manipulate the new Writer.
*/
public final static int EVAL_BODY_TAG = 2;
/**
* Setter method for the bodyContent property.
* <p>
* This method will not be invoked if there is no body evaluation.
*
* @param b the BodyContent
* @seealso #doInitBody
* @seealso #doAfterBody
*/
void setBodyContent(BodyContent b);
/**
* Prepare for evaluation of the body.
* <p>
* The method will be invoked once per action invocation by the page implementation
* after a new BodyContent has been obtained and set on the tag handler
* via the setBodyContent() method and before the evaluation
* of the tag's body into that BodyContent.
* <p>
* This method will not be invoked if there is no body evaluation.
*
* @seealso #doAfterBody
*/
void doInitBody() throws JspException;
/**
* Actions after some body has been evaluated.
* <p>
* Not invoked in empty tags or in tags returning SKIP_BODY in doStartTag()
* T