org.springframework.web.servlet.tags
Class EvalTag

java.lang.Object
  TagSupport
      org.springframework.web.servlet.tags.RequestContextAwareTag
          org.springframework.web.servlet.tags.HtmlEscapingAwareTag
              org.springframework.web.servlet.tags.EvalTag

public class EvalTag
extends HtmlEscapingAwareTag

JSP tag for evaluating expressions with the Spring Expression Language (SpEL). Supports the standard JSP evaluation context consisting of implicit variables and scoped attributes.

Since:

3.0.1

Author:

Keith Donald, Juergen Hoeller

Nested Class Summary

private static class

EvalTag.JspPropertyAccessor

Field Summary

private static java.lang.String	EVALUATION_CONTEXT_PAGE_ATTRIBUTE javax.servlet.jsp.PageContext attribute for the page-level EvaluationContext instance.
private Expression	expression
private ExpressionParser	expressionParser
private boolean	javaScriptEscape
private int	scope
private java.lang.String	var

Fields inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag

logger, REQUEST_CONTEXT_PAGE_ATTRIBUTE

Constructor Summary

EvalTag()

Method Summary

private EvaluationContext	createEvaluationContext(PageContext pageContext)
int	doEndTag()
int	doStartTagInternal() Called by doStartTag to perform the actual work.
private ConversionService	getConversionService(PageContext pageContext)
void	setExpression(java.lang.String expression) Set the expression to evaluate.
void	setJavaScriptEscape(java.lang.String javaScriptEscape) Set JavaScript escaping for this tag, as boolean value.
void	setScope(java.lang.String scope) Set the scope to export the evaluation result to.
void	setVar(java.lang.String var) Set the variable name to expose the evaluation result under.

Methods inherited from class org.springframework.web.servlet.tags.HtmlEscapingAwareTag

isDefaultHtmlEscape, isHtmlEscape, setHtmlEscape

Methods inherited from class org.springframework.web.servlet.tags.RequestContextAwareTag

doCatch, doFinally, doStartTag, getRequestContext

Methods inherited from class java.lang.Object

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

Field Detail

EVALUATION_CONTEXT_PAGE_ATTRIBUTE

private static final java.lang.String EVALUATION_CONTEXT_PAGE_ATTRIBUTE

javax.servlet.jsp.PageContext attribute for the page-level EvaluationContext instance.

See Also:

Constant Field Values

expressionParser

private final ExpressionParser expressionParser

expression

private Expression expression

var

private java.lang.String var

scope

private int scope

javaScriptEscape

private boolean javaScriptEscape

Constructor Detail

EvalTag

public EvalTag()

Method Detail

setExpression

public void setExpression(java.lang.String expression)

Set the expression to evaluate.

setVar

public void setVar(java.lang.String var)

Set the variable name to expose the evaluation result under. Defaults to rendering the result to the current JspWriter.

setScope

public void setScope(java.lang.String scope)

Set the scope to export the evaluation result to. This attribute has no meaning unless var is also defined.

setJavaScriptEscape

public void setJavaScriptEscape(java.lang.String javaScriptEscape)
                         throws JspException

Set JavaScript escaping for this tag, as boolean value. Default is "false".

Throws:

JspException

doStartTagInternal

public int doStartTagInternal()
                       throws JspException

Description copied from class: RequestContextAwareTag

Called by doStartTag to perform the actual work.

Specified by:

doStartTagInternal in class RequestContextAwareTag

Returns:

same as TagSupport.doStartTag

Throws:

JspException

See Also:

javax.servlet.jsp.tagext.TagSupport#doStartTag

doEndTag

public int doEndTag()
             throws JspException

Throws:

JspException

createEvaluationContext

private EvaluationContext createEvaluationContext(PageContext pageContext)

getConversionService

private ConversionService getConversionService(PageContext pageContext)