Package org.geotools.filter.visitor

Class IsStaticExpressionVisitor

  • All Implemented Interfaces:
    ExpressionVisitor
    public class IsStaticExpressionVisitor
extends Object
implements ExpressionVisitor
    Check if an expression is static (ie does not contain a PropertyName expression).

    This visitor will "short-circuit" the moment it finds a PropertyName expression and will not need to visit the entire data structure.

    Example: 

    
 if( filter.accepts( IsStaticExpressionVisitor.VISITOR, null ) ){
     Color color = expression.evaulate( null, Color.class );
     ...
 }
    Author:
    Jody

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      protected IsStaticExpressionVisitor()
      visit each expression and check that they are static

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Boolean visit​(Add expression, Object data)
      visit each expression and check that they are static
      Boolean visit​(Divide expression, Object data)
      visit each expression and check that they are static
      Boolean visit​(Function expression, Object data)
      Visit each parameter and check if they are static
      Boolean visit​(Literal expression, Object data)
      Literal expressions are always static.
      Boolean visit​(Multiply expression, Object data)
      visit each expression and check that they are static.
      Boolean visit​(NilExpression expression, Object data)
      visit each expression and check that they are static
      Boolean visit​(PropertyName expression, Object data)
      If even a single PropertyName is found in the expression the expression is not static.
      Boolean visit​(Subtract expression, Object data)
      visit each expression and check that they are static.

      • Methods inherited from class Object

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

    • Constructor Detail

      • IsStaticExpressionVisitor

        protected IsStaticExpressionVisitor()
        visit each expression and check that they are static

    • Method Detail

      • visit

        public Boolean visit​(NilExpression expression,
                     Object data)
        visit each expression and check that they are static
        Specified by:
        visit in interface ExpressionVisitor
        Returns:
        implementation specific

      • visit

        public Boolean visit​(Add expression,
                     Object data)
        visit each expression and check that they are static
        Specified by:
        visit in interface ExpressionVisitor

      • visit

        public Boolean visit​(Divide expression,
                     Object data)
        visit each expression and check that they are static
        Specified by:
        visit in interface ExpressionVisitor

      • visit

        public Boolean visit​(Function expression,
                     Object data)
        Visit each parameter and check if they are static
        Specified by:
        visit in interface ExpressionVisitor

      • visit

        public Boolean visit​(Literal expression,
                     Object data)
        Literal expressions are always static.
        Specified by:
        visit in interface ExpressionVisitor
        Returns:
        true

      • visit

        public Boolean visit​(Multiply expression,
                     Object data)
        visit each expression and check that they are static.
        Specified by:
        visit in interface ExpressionVisitor
        Returns:
        true if getExpression1 and getExpression2 are static

      • visit

        public Boolean visit​(PropertyName expression,
                     Object data)
        If even a single PropertyName is found in the expression the expression is not static.
        Specified by:
        visit in interface ExpressionVisitor
        Returns:
        false

      • visit

        public Boolean visit​(Subtract expression,
                     Object data)
        visit each expression and check that they are static.
        Specified by:
        visit in interface ExpressionVisitor
        Returns:
        true if getExpression1 and getExpression2 are static