Package org.eclipse.core.expressions

Class ExpressionConverter

  • public final class ExpressionConverter
extends java.lang.Object
    An expression converter converts an XML expression represented by an IConfigurationElement or Element (DOM) subtree into a corresponding expression tree.

    An expression converter manages a list of ElementHandlers. Element handlers are responsible to do the actual conversion. The element handlers build a chain of responsibility.

    Since:
    3.0

    • Constructor Summary

      Constructors 
      Constructor Description
      ExpressionConverter​(ElementHandler[] handlers)
      Creates a new expression converter with the given list of element handlers.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      static ExpressionConverter getDefault()
      Returns the default expression converter.
      Expression perform​(IConfigurationElement root)
      Converts the tree of configuration elements represented by the given root element and returns a corresponding expression tree.
      Expression perform​(org.w3c.dom.Element root)
      Converts the tree of DOM elements represented by the given root element and returns a corresponding expression tree.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • ExpressionConverter

        public ExpressionConverter​(ElementHandler[] handlers)
        Creates a new expression converter with the given list of element handlers. The element handlers build a chain of responsibility meaning that the first handler in the list is first used to convert the configuration element. If this handler isn't able to convert the configuration element the next handler in the array is used.
        Parameters:
        handlers - the array of element handlers

    • Method Detail

      • getDefault

        public static ExpressionConverter getDefault()
        Returns the default expression converter. The default expression converter can cope with all expression elements defined by the common expression language.
        Returns:
        the default expression converter

      • perform

        public Expression perform​(IConfigurationElement root)
                   throws CoreException
        Converts the tree of configuration elements represented by the given root element and returns a corresponding expression tree.
        Parameters:
        root - the configuration element to be converted
        Returns:
        the corresponding expression tree or null if the configuration element cannot be converted
        Throws:
        CoreException - if the configuration element can't be converted. Reasons include: (a) no handler is available to cope with a certain configuration element or (b) the XML expression tree is malformed.

      • perform

        public Expression perform​(org.w3c.dom.Element root)
                   throws CoreException
        Converts the tree of DOM elements represented by the given root element and returns a corresponding expression tree.
        Parameters:
        root - the element to be converted
        Returns:
        the corresponding expression tree or null if the element cannot be converted
        Throws:
        CoreException - if the element can't be converted. Reasons include: (a) no handler is available to cope with a certain element or (b) the XML expression tree is malformed.
        Since:
        3.3