Package org.geotools.brewer.styling.filter.expression

Class ChildExpressionBuilder<P extends Builder<?>>

  • Type Parameters:
    P - parent builder
    All Implemented Interfaces:
    Builder<Expression>
    Direct Known Subclasses:
    FunctionBuilder.ParamBuilder
    public class ChildExpressionBuilder<P extends Builder<?>>
extends ExpressionBuilder
    Child expression builder; suitable for use collecting function parameters and binary expression arguments.

    This builder is designed to be "chained" from a parent builder; you may return to the parent builder at any time by calling end().

    • Field Detail

      • parent

        protected P extends Builder<?> parent

    • Constructor Detail

      • ChildExpressionBuilder

        public ChildExpressionBuilder​(P parent)

      • ChildExpressionBuilder

        public ChildExpressionBuilder​(P parent,
                              Expression expr1)

    • Method Detail

      • reset

        public ChildExpressionBuilder<P> reset​(Expression original)
        Description copied from interface: Builder
        Configure the Builder to produce a copy of the provided original.
        Specified by:
        reset in interface Builder<P extends Builder<?>>
        Overrides:
        reset in class ExpressionBuilder
        Parameters:
        original - Original, if null this will behave the same as unset()
        Returns:
        Builder configured to produce the provided original

      • unset

        public ChildExpressionBuilder<P> unset()
        Description copied from interface: Builder
        Configure the Builder to produce null.

        This method allows a Builder to be used as a placeholder; in its unset state the build() method will produce null. If any of the builder methods are used the builder will produce a result.

        Specified by:
        unset in interface Builder<P extends Builder<?>>
        Overrides:
        unset in class ExpressionBuilder
        Returns:
        Builder configured to build null

      • build

        public Expression build()
        Build the parameter; adding it to the parent.

        When using this from another builder you may wish to override the this build() method as shown below: 

         final Expression array[] = ...
 ChildExpressionBuilder first = new ChildExpressionBuilder<?>(this) {
      public Expression build() {
          array[0] = super.build();
          return array[0];
      }
  };
 }
        Specified by:
        build in interface Builder<P extends Builder<?>>
        Overrides:
        build in class ExpressionBuilder
        Returns:
        internal expression

      • end

        public P end()
        Build the expression and return to the parent builder.

        Example use:b.add().expr1().literal(1).end().expr2().literal(2).end().build();

        See Also:
        _build()

      • literal

        public P literal​(Object obj)
        Inline literal value.

        Example:b.literal( 1 );

        Overrides:
        literal in class ExpressionBuilder
        Parameters:
        obj - Object to use as the resulting literal