Examples of javax.servlet.jsp.tagext.IterationTag

javax.servlet.jsp.tagext.IterationTag
The IterationTag interface extends Tag by defining one additional method that controls the reevaluation of its body.
A tag handler that implements IterationTag is treated as one that implements Tag regarding the doStartTag() and doEndTag() methods. IterationTag provides a new method: doAfterBody().
The doAfterBody() method is invoked after every body evaluation to control whether the body will be reevaluated or not. If doAfterBody() returns IterationTag.EVAL_BODY_AGAIN, then the body will be reevaluated. If doAfterBody() returns Tag.SKIP_BODY, then the body will be skipped and doEndTag() will be evaluated instead.
Properties There are no new properties in addition to those in Tag.
Methods There is one new methods: doAfterBody().
Lifecycle
Lifecycle details are described by the transition diagram below. Exceptions that are thrown during the computation of doStartTag(), BODY and doAfterBody() interrupt the execution sequence and are propagated up the stack, unless the tag handler implements the TryCatchFinally interface; see that interface for details.

Empty and Non-Empty Action
If the TagLibraryDescriptor file indicates that the action must always have an empty action, by an <body-content> entry of "empty", then the doStartTag() method must return SKIP_BODY. Otherwise, the doStartTag() method may return SKIP_BODY or EVAL_BODY_INCLUDE.
If SKIP_BODY is returned the body is not evaluated, and then doEndTag() is invoked.
If EVAL_BODY_INCLUDE is returned, the body is evaluated and "passed through" to the current out, then doAfterBody() is invoked and, after zero or more iterations, doEndTag() is invoked.

            if (status != Tag.SKIP_BODY)
            {
                BodyContent body = null;
                try
                {
                    IterationTag iterationTag = (IterationTag) this.tag;
                    if ((status == BodyTag.EVAL_BODY_BUFFERED)
                        && (this.tag instanceof BodyTag))
                    {
                        BodyTag bodyTag = (BodyTag) this.tag;
                        body = pageContext.pushBody();
                        if (log.isDebugEnabled())
                        {
                            log.debug("Pushed body content ["
                                + body.getString() + "]");
                        }
                        bodyTag.setBodyContent(body);
                        bodyTag.doInitBody();
                    }
                    int iteration = 0;
                    do
                    {
                        fireEvalBody(iteration, body);
                        if (log.isDebugEnabled())
                        {
                            log.debug("Body evaluated for the ["
                                + iteration + "] time");
                        }
                        status = iterationTag.doAfterBody();
                        iteration++;
                    } while (status == IterationTag.EVAL_BODY_AGAIN);
                    if (log.isDebugEnabled())
                    {
                        log.debug("Body skipped");

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            if (status != Tag.SKIP_BODY)
            {
                BodyContent body = null;
                try
                {
                    IterationTag iterationTag = (IterationTag) this.tag;
                    if ((status == BodyTag.EVAL_BODY_BUFFERED)
                        && (this.tag instanceof BodyTag))
                    {
                        BodyTag bodyTag = (BodyTag) this.tag;
                        body = pageContext.pushBody();
                        if (log.isDebugEnabled())
                        {
                            log.debug("Pushed body content ["
                                + body.getString() + "]");
                        }
                        bodyTag.setBodyContent(body);
                        bodyTag.doInitBody();
                    }
                    int iteration = 0;
                    do
                    {
                        fireEvalBody(iteration, body);
                        if (log.isDebugEnabled())
                        {
                            log.debug("Body evaluated for the ["
                                + iteration + "] time");
                        }
                        status = iterationTag.doAfterBody();
                        iteration++;
                    } while (status == IterationTag.EVAL_BODY_AGAIN);
                    if (log.isDebugEnabled())
                    {
                        log.debug("Body skipped");

View Full Code Here

            if (status != Tag.SKIP_BODY)
            {
                BodyContent body = null;
                try
                {
                    IterationTag iterationTag = (IterationTag) this.tag;
                    if ((status == BodyTag.EVAL_BODY_BUFFERED)
                        && (this.tag instanceof BodyTag))
                    {
                        BodyTag bodyTag = (BodyTag) this.tag;
                        body = pageContext.pushBody();
                        if (log.isDebugEnabled())
                        {
                            log.debug("Pushed body content ["
                                + body.getString() + "]");
                        }
                        bodyTag.setBodyContent(body);
                        bodyTag.doInitBody();
                    }
                    int iteration = 0;
                    do
                    {
                        fireEvalBody(iteration, body);
                        if (log.isDebugEnabled())
                        {
                            log.debug("Body evaluated for the ["
                                + iteration + "] time");
                        }
                        status = iterationTag.doAfterBody();
                        iteration++;
                    } while (status == IterationTag.EVAL_BODY_AGAIN);
                    if (log.isDebugEnabled())
                    {
                        log.debug("Body skipped");

View Full Code Here

            if (status != Tag.SKIP_BODY)
            {
                BodyContent body = null;
                try
                {
                    IterationTag iterationTag = (IterationTag) this.tag;
                    if ((status == BodyTag.EVAL_BODY_BUFFERED)
                        && (this.tag instanceof BodyTag))
                    {
                        BodyTag bodyTag = (BodyTag) this.tag;
                        body = pageContext.pushBody();
                        if (log.isDebugEnabled())
                        {
                            log.debug("Pushed body content ["
                                + body.getString() + "]");
                        }
                        bodyTag.setBodyContent(body);
                        bodyTag.doInitBody();
                    }
                    int iteration = 0;
                    do
                    {
                        fireEvalBody(iteration, body);
                        if (log.isDebugEnabled())
                        {
                            log.debug("Body evaluated for the ["
                                + iteration + "] time");
                        }
                        status = iterationTag.doAfterBody();
                        iteration++;
                    } while (status == IterationTag.EVAL_BODY_AGAIN);
                    if (log.isDebugEnabled())
                    {
                        log.debug("Body skipped");

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org.apache.cactus.extension.jsp.JspTagLifecycle

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