Package org.eclipse.e4.core.contexts

Class ContextFunction

java.lang.Object
org.eclipse.e4.core.contexts.ContextFunction
All Implemented Interfaces:
IContextFunction
public abstract class ContextFunction extends Object implements IContextFunction
The base class for all computed value implementations. Clients may subclass this class. See the class comment of IContextFunction for specific rules that must be followed by function implementations.

This class is intended to be subclassed by clients.

Since:
1.3
See Also:

  • Constructor Details

    • ContextFunction

      public ContextFunction()
      Constructs a new instance of the context function

  • Method Details

    • compute

      @Deprecated public Object compute(IEclipseContext context)
      Deprecated.
      IContextFunction's compute() was changed to take the context key

    • compute

      public Object compute(IEclipseContext context, String contextKey)
      Description copied from interface: IContextFunction
      Evaluates the function based on the provided arguments and context to produce a consistent result.
      Specified by:
      compute in interface IContextFunction
      Parameters:
      context - The context in which to perform the value computation.
      contextKey - The context key used to find this function; may be null such as if invoked directly.
      Returns:
      The concrete value. Implementations may return IInjector.NOT_A_VALUE to cause lookup to continue up the context hierarchy.