Package jakarta.el

Class ExpressionFactory


  • public abstract class ExpressionFactory
    extends java.lang.Object
    Since:
    2.1
    • Constructor Detail

      • ExpressionFactory

        public ExpressionFactory()
    • Method Detail

      • newInstance

        public static ExpressionFactory newInstance()
        Create a new ExpressionFactory. The class to use is determined by the following search order:
        1. services API (META-INF/services/jakarta.el.ExpressionFactory)
        2. $JRE_HOME/lib/el.properties - key jakarta.el.ExpressionFactory
        3. jakarta.el.ExpressionFactory
        4. Platform default implementation - org.apache.el.ExpressionFactoryImpl
        Returns:
        the new ExpressionFactory
      • newInstance

        public static ExpressionFactory newInstance​(java.util.Properties properties)
        Create a new ExpressionFactory passing in the provided Properties. Search order is the same as newInstance().
        Parameters:
        properties - the properties to be passed to the new instance (may be null)
        Returns:
        the new ExpressionFactory
      • createValueExpression

        public abstract ValueExpression createValueExpression​(ELContext context,
                                                              java.lang.String expression,
                                                              java.lang.Class<?> expectedType)
        Create a new value expression.
        Parameters:
        context - The EL context for this evaluation
        expression - The String representation of the value expression
        expectedType - The expected type of the result of evaluating the expression
        Returns:
        A new value expression formed from the input parameters
        Throws:
        java.lang.NullPointerException - If the expected type is null
        ELException - If there are syntax errors in the provided expression
      • createValueExpression

        public abstract ValueExpression createValueExpression​(java.lang.Object instance,
                                                              java.lang.Class<?> expectedType)
      • createMethodExpression

        public abstract MethodExpression createMethodExpression​(ELContext context,
                                                                java.lang.String expression,
                                                                java.lang.Class<?> expectedReturnType,
                                                                java.lang.Class<?>[] expectedParamTypes)
        Create a new method expression instance.
        Parameters:
        context - The EL context for this evaluation
        expression - The String representation of the method expression
        expectedReturnType - The expected type of the result of invoking the method
        expectedParamTypes - The expected types of the input parameters
        Returns:
        A new method expression formed from the input parameters.
        Throws:
        java.lang.NullPointerException - If the expected parameters types are null
        ELException - If there are syntax errors in the provided expression
      • coerceToType

        public abstract java.lang.Object coerceToType​(java.lang.Object obj,
                                                      java.lang.Class<?> expectedType)
        Coerce the supplied object to the requested type.
        Parameters:
        obj - The object to be coerced
        expectedType - The type to which the object should be coerced
        Returns:
        An instance of the requested type.
        Throws:
        ELException - If the conversion fails
      • getStreamELResolver

        public ELResolver getStreamELResolver()
        Returns:
        This default implementation returns null
        Since:
        EL 3.0
      • getInitFunctionMap

        public java.util.Map<java.lang.String,​java.lang.reflect.Method> getInitFunctionMap()
        Returns:
        This default implementation returns null
        Since:
        EL 3.0