javax.servlet.jsp.el

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Java Source Code / Java Documentation » Sevlet Container » apache tomcat 6.0.14 » javax.servlet.jsp.el 
javax.servlet.jsp.el
Classes and interfaces for the JSP 2.0 Expression Language API.

The JavaServer Pages(tm) (JSP) 2.0 specification provides a portable API for evaluating "EL Expressions". As of JSP 2.0, EL expressions can be placed directly in the template text of JSP pages and tag files.

This package contains a number of classes and interfaces that describe and define programmatic access to the Expression Language evaluator. This API can also be used by an implementation of JSP to evaluate the expressions, but other implementations, like open-coding into Java bytecodes, are allowed. This package is intended to have no dependencies on other portions of the JSP 2.0 specification.

Java Source File NameTypeComment
ELException.javaClass Represents any of the exception conditions that arise during the operation evaluation of the evaluator.
ELParseException.javaClass Represents a parsing error encountered while parsing an EL expression.
Expression.javaClass

The abstract class for a prepared expression.

An instance of an Expression can be obtained via from an ExpressionEvaluator instance.

An Expression may or not have done a syntactic parse of the expression. A client invoking the evaluate() method should be ready for the case where ELParseException exceptions are raised.

ExpressionEvaluator.javaClass

The abstract base class for an expression-language evaluator. Classes that implement an expression language expose their functionality via this abstract class.

An instance of the ExpressionEvaluator can be obtained via the JspContext / PageContext

The parseExpression() and evaluate() methods must be thread-safe.

FunctionMapper.javaInterface

The interface to a map between EL function names and methods.

Classes implementing this interface may, for instance, consult tag library information to resolve the map.

ImplicitObjectELResolver.javaClass
ScopedAttributeELResolver.javaClass
VariableResolver.javaInterface

This class is used to customize the way an ExpressionEvaluator resolves variable references at evaluation time.

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