Class ElementHandler


  • public abstract class ElementHandler
    extends Object
    An element handler converts an IConfigurationElement into a corresponding expression object.

    The class should be subclassed by clients wishing to provide an element handler for special expressions.

    Since:
    3.0
    • Constructor Detail

      • ElementHandler

        public ElementHandler()
    • Method Detail

      • getDefault

        public static ElementHandler getDefault()
        The default element handler which can cope with all XML expression elements defined by the common expression language.
        Returns:
        the default element handler
      • create

        public abstract Expression create​(ExpressionConverter converter,
                                          IConfigurationElement config)
                                   throws CoreException
        Creates the corresponding expression for the given configuration element.
        Parameters:
        converter - the expression converter used to initiate the conversion process
        config - the configuration element to convert
        Returns:
        the corresponding expression
        Throws:
        CoreException - if the conversion failed
      • create

        public Expression create​(ExpressionConverter converter,
                                 Element element)
                          throws CoreException
        Creates the corresponding expression for the given DOM element. This is an optional operation that is only required if the handler supports conversion of DOM elements.
        Parameters:
        converter - the expression converter used to initiate the conversion process
        element - the DOM element to convert
        Returns:
        the corresponding expression
        Throws:
        CoreException - if the conversion failed
        Since:
        3.3
      • processChildren

        protected void processChildren​(ExpressionConverter converter,
                                       IConfigurationElement element,
                                       org.eclipse.core.internal.expressions.CompositeExpression expression)
                                throws CoreException
        Converts the children of the given configuration element and adds them to the given composite expression.

        Note this is an internal method and should not be called by clients.

        Parameters:
        converter - the converter used to do the actual conversion
        element - the configuration element for which the children are to be processed
        expression - the composite expression representing the result of the conversion
        Throws:
        CoreException - if the conversion failed
        Restriction:
        This method is not intended to be referenced by clients.
        Restriction:
        This method is not intended to be re-implemented or extended by clients.
      • processChildren

        protected void processChildren​(ExpressionConverter converter,
                                       Element element,
                                       org.eclipse.core.internal.expressions.CompositeExpression expression)
                                throws CoreException
        Converts the children of the given DOM element and adds them to the given composite expression.

        Note this is an internal method and should not be called by clients.

        Parameters:
        converter - the converter used to do the actual conversion
        element - the DOM element for which the children are to be processed
        expression - the composite expression representing the result of the conversion
        Throws:
        CoreException - if the conversion failed
        Since:
        3.3
        Restriction:
        This method is not intended to be referenced by clients.
        Restriction:
        This method is not intended to be re-implemented or extended by clients.