Package com.sun.el

Class ExpressionFactoryImpl

java.lang.Object
jakarta.el.ExpressionFactory
com.sun.el.ExpressionFactoryImpl

public class ExpressionFactoryImpl extends ExpressionFactory
Version:
$Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: kchung $
See Also:
  • Field Details

    • properties

      private Properties properties
    • isBackwardCompatible22

      private boolean isBackwardCompatible22
  • Constructor Details

    • ExpressionFactoryImpl

      public ExpressionFactoryImpl()
    • ExpressionFactoryImpl

      public ExpressionFactoryImpl(Properties properties)
  • Method Details

    • coerceToType

      public Object coerceToType(Object obj, Class<?> type)
      Coerces an object to a specific type according to the Jakarta Expression Language type conversion rules. The custom type conversions in the ELResolvers are not considered. Jakarta Expression Language version 2.2 backward compatibility conversion rules apply if ExpressionFactoryImpl was created with property "jakarta.el.bc2.2" set to true.
      Specified by:
      coerceToType in class ExpressionFactory
      Parameters:
      obj - The object to coerce.
      type - The target type for the coercion.
      Returns:
      an object coerced to targetType
    • createMethodExpression

      public MethodExpression createMethodExpression(ELContext context, String expression, Class<?> expectedReturnType, Class<?>[] expectedParamTypes)
      Description copied from class: ExpressionFactory
      Parses an expression into a MethodExpression for later evaluation. Use this method for expressions that refer to methods.

      If the expression is a String literal, a MethodExpression is created, which when invoked, returns the String literal, coerced to expectedReturnType. An ELException is thrown if expectedReturnType is void or if the coercion of the String literal to the expectedReturnType yields an error (see Section "1.16 Type Conversion").

      This method should perform syntactic validation of the expression. If in doing so it detects errors, it should raise an ELException.

      Specified by:
      createMethodExpression in class ExpressionFactory
      Parameters:
      context - The Jakarta Expression Language context used to parse the expression. The FunctionMapper and VariableMapper stored in the ELContext are used to resolve functions and variables found in the expression. They can be null, in which case functions or variables are not supported for this expression. The object returned must invoke the same functions and access the same variable mappings regardless of whether the mappings in the provided FunctionMapper and VariableMapper instances change between calling ExpressionFactory.createMethodExpression() and any method on MethodExpression. Note that within the EL, the ${} and #{} syntaxes are treated identically. This includes the use of VariableMapper and FunctionMapper at expression creation time. Each is invoked if not null, independent of whether the #{} or ${} syntax is used for the expression.
      expression - The expression to parse
      expectedReturnType - The expected return type for the method to be found. After evaluating the expression, the MethodExpression must check that the return type of the actual method matches this type. Passing in a value of null indicates the caller does not care what the return type is, and the check is disabled.
      expectedParamTypes - The expected parameter types for the method to be found. Must be an array with no elements if there are no parameters expected. It is illegal to pass null, unless the method is specified with arguments in the Jakarta Expression Language expression, in which case these arguments are used for method selection, and this parameter is ignored.
      Returns:
      The parsed expression
    • createValueExpression

      public ValueExpression createValueExpression(ELContext context, String expression, Class<?> expectedType)
      Description copied from class: ExpressionFactory
      Parses an expression into a ValueExpression for later evaluation. Use this method for expressions that refer to values.

      This method should perform syntactic validation of the expression. If in doing so it detects errors, it should raise an ELException.

      Specified by:
      createValueExpression in class ExpressionFactory
      Parameters:
      context - The Jakarta Expression Language context used to parse the expression. The FunctionMapper and VariableMapper stored in the ELContext are used to resolve functions and variables found in the expression. They can be null, in which case functions or variables are not supported for this expression. The object returned must invoke the same functions and access the same variable mappings regardless of whether the mappings in the provided FunctionMapper and VariableMapper instances change between calling ExpressionFactory.createValueExpression() and any method on ValueExpression. Note that within Jakarta Expression Language, the ${} and #{} syntaxes are treated identically. This includes the use of VariableMapper and FunctionMapper at expression creation time. Each is invoked if not null, independent of whether the #{} or ${} syntax is used for the expression.
      expression - The expression to parse
      expectedType - The type the result of the expression will be coerced to after evaluation.
      Returns:
      The parsed expression
    • createValueExpression

      public ValueExpression createValueExpression(Object instance, Class<?> expectedType)
      Description copied from class: ExpressionFactory
      Creates a ValueExpression that wraps an object instance.

      This method can be used to pass any object as a ValueExpression. The wrapper ValueExpression is read only, and returns the wrapped object via its getValue() method, optionally coerced.

      Specified by:
      createValueExpression in class ExpressionFactory
      Parameters:
      instance - The object instance to be wrapped.
      expectedType - The type the result of the expression will be coerced to after evaluation. There will be no coercion if it is Object.class,
      Returns:
      a ValueExpression that wraps an object instance
    • getProperty

      public String getProperty(String key)
    • getStreamELResolver

      public ELResolver getStreamELResolver()
      Description copied from class: ExpressionFactory
      Retrieves an ELResolver that implements the operations in collections.

      This ELResolver resolves the method invocation on the pair (base, property) when base is a Collection or a Map, and property is the name of the operation.

      See the specification document for detailed descriptions of these operators, their arguments, and return values.

      Overrides:
      getStreamELResolver in class ExpressionFactory
      Returns:
      The ELResolver that implements the Query Operators.
    • getInitFunctionMap

      public Map<String,Method> getInitFunctionMap()
      Description copied from class: ExpressionFactory
      Retrieve a function map containing a pre-configured function mapping.
      Overrides:
      getInitFunctionMap in class ExpressionFactory
      Returns:
      A initial map for functions, null if there is none.