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java.lang.Objectorg.springframework.web.util.ExpressionEvaluationUtils
Convenience methods for easy access to the JSP Expression Language evaluator of Jakarta's JSTL implementation.
The evaluation methods check if the value contains "${" before invoking the EL evaluator, treating the value as "normal" expression (i.e. conventional String) else.
Note: The evaluation methods do not have a runtime dependency on Jakarta's JSTL implementation, as long as they don't receive actual EL expressions.
Constructor Summary | |
ExpressionEvaluationUtils()
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Method Summary | |
static Object |
evaluate(String attrName,
String attrValue,
Class resultClass,
PageContext pageContext)
Evaluate the given expression to an Object, be it EL or a conventional String. |
static boolean |
evaluateBoolean(String attrName,
String attrValue,
PageContext pageContext)
Evaluate the given expression to a boolean, be it EL or a conventional String. |
static int |
evaluateInteger(String attrName,
String attrValue,
PageContext pageContext)
Evaluate the given expression to an integer, be it EL or a conventional String. |
static String |
evaluateString(String attrName,
String attrValue,
PageContext pageContext)
Evaluate the given expression to a String, be it EL or a conventional String. |
static boolean |
isExpressionLanguage(String value)
Check if the given expression value is an EL expression. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ExpressionEvaluationUtils()
Method Detail |
public static boolean isExpressionLanguage(String value)
value
- the expression to check
true
if the expression is an EL expression,
false
otherwisepublic static Object evaluate(String attrName, String attrValue, Class resultClass, PageContext pageContext) throws JspException
attrName
- name of the attribute (typically a JSP tag attribute)attrValue
- value of the attributeresultClass
- class that the result should have (String, Integer, Boolean)pageContext
- current JSP PageContext
JspException
- in case of parsing errorspublic static String evaluateString(String attrName, String attrValue, PageContext pageContext) throws JspException
attrName
- name of the attribute (typically a JSP tag attribute)attrValue
- value of the attributepageContext
- current JSP PageContext
JspException
- in case of parsing errorspublic static int evaluateInteger(String attrName, String attrValue, PageContext pageContext) throws JspException
attrName
- name of the attribute (typically a JSP tag attribute)attrValue
- value of the attributepageContext
- current JSP PageContext
JspException
- in case of parsing errorspublic static boolean evaluateBoolean(String attrName, String attrValue, PageContext pageContext) throws JspException
attrName
- name of the attribute (typically a JSP tag attribute)attrValue
- value of the attributepageContext
- current JSP PageContext
JspException
- in case of parsing errors
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