Interface ExpressionNode

    • Method Detail

      • isLiteralText

        boolean isLiteralText()
        Returns:
        true if this node represents literal text
      • isLeftValue

        boolean isLeftValue()
        Returns:
        true if the subtree rooted at this node could be used as an lvalue expression (identifier or property sequence with non-literal prefix).
      • isMethodInvocation

        boolean isMethodInvocation()
        Returns:
        true if the subtree rooted at this node is a method invocation.
      • getValue

        Object getValue​(Bindings bindings,
                        ELContext context,
                        Class<?> expectedType)
        Evaluate node.
        Parameters:
        bindings - bindings containing variables and functions
        context - evaluation context
        expectedType - result type
        Returns:
        evaluated node, coerced to the expected type
      • getValueReference

        ValueReference getValueReference​(Bindings bindings,
                                         ELContext context)
        Get value reference.
        Parameters:
        bindings -
        context -
        Returns:
        value reference
      • setValue

        void setValue​(Bindings bindings,
                      ELContext context,
                      Object value)
        Assign value.
        Parameters:
        bindings - bindings containing variables and functions
        context - evaluation context
        value - value to set
      • getMethodInfo

        MethodInfo getMethodInfo​(Bindings bindings,
                                 ELContext context,
                                 Class<?> returnType,
                                 Class<?>[] paramTypes)
        Get method information. If this is a non-lvalue node, answer null.
        Parameters:
        bindings - bindings containing variables and functions
        context - evaluation context
        returnType - expected method return type (may be null meaning don't care)
        paramTypes - expected method argument types
        Returns:
        method information or null
      • invoke

        Object invoke​(Bindings bindings,
                      ELContext context,
                      Class<?> returnType,
                      Class<?>[] paramTypes,
                      Object[] paramValues)
        Invoke method.
        Parameters:
        bindings - bindings containing variables and functions
        context - evaluation context
        returnType - expected method return type (may be null meaning don't care)
        paramTypes - expected method argument types
        paramValues - parameter values
        Returns:
        result of the method invocation
      • getStructuralId

        String getStructuralId​(Bindings bindings)
        Get the canonical expression string for this node. Variable and funtion names will be replaced in a way such that two expression nodes that have the same node structure and bindings will also answer the same value here.

        For example, "${foo:bar()+2*foobar}" may lead to "${<fn>() + 2 * <var>}" if foobar is a bound variable. Otherwise, the structural id would be "${<fn>() + 2 * foobar}".

        If the bindings is null, the full canonical subexpression is returned.