Package com.yahoo.searchlib.rankingexpression.evaluation

Class Value

  • Direct Known Subclasses:
    DoubleCompatibleValue, StringValue, TensorValue
    public abstract class Value
extends Object
    The result of a ranking expression evaluation. Concrete subclasses of this provides implementations of these methods or throws UnsupportedOperationException if the operation is not supported.
    Author:
    bratseth

    • Constructor Detail

      • Value

        public Value()

    • Method Detail

      • type

        public abstract com.yahoo.tensor.TensorType type()
        Returns the type of this value

      • asDouble

        public abstract double asDouble()
        Returns this value as a double, or throws UnsupportedOperationException if it cannot be represented as a double

      • asDoubleValue

        public DoubleValue asDoubleValue()
        Returns this value as a double value, or throws UnsupportedOperationException if it cannot be represented as a double

      • isNaN

        public boolean isNaN()
        Returns true if this has a double value which is NaN

      • asTensor

        public abstract com.yahoo.tensor.Tensor asTensor()
        Returns this as a tensor value

      • doubleAsTensor

        protected com.yahoo.tensor.Tensor doubleAsTensor​(double value)
        A utility method for wrapping a double in a rank 0 tensor

      • hasDouble

        public abstract boolean hasDouble()
        Returns true if this value can return itself as a double, i.e asDoubleValue will return a value and not throw

      • asBoolean

        public abstract boolean asBoolean()
        Returns this value as a boolean.

      • negate

        public abstract Value negate()

      • add

        public abstract Value add​(Value value)

      • subtract

        public abstract Value subtract​(Value value)

      • multiply

        public abstract Value multiply​(Value value)

      • divide

        public abstract Value divide​(Value value)

      • modulo

        public abstract Value modulo​(Value value)

      • and

        public abstract Value and​(Value value)

      • not

        public abstract Value not()

      • power

        public abstract Value power​(Value value)

      • compare

        public abstract Value compare​(TruthOperator operator,
                              Value value)
        Perform the comparison specified by the operator between this value and the given value

      • function

        public abstract Value function​(Function function,
                               Value value)
        Perform the given binary function on this value and the given value

      • freeze

        public Value freeze()
        Irreversibly makes this immutable. Overriders must always call super.freeze() and return this
        Returns:
        this for convenience

      • isFrozen

        public final boolean isFrozen()
        Returns true if this is immutable, false otherwise

      • asMutable

        public abstract Value asMutable()
        Returns this is mutable, or a mutable copy otherwise

      • equals

        public abstract boolean equals​(Object other)
        Overrides:
        equals in class Object

      • hashCode

        public abstract int hashCode()
        Overrides:
        hashCode in class Object

      • parse

        public static Value parse​(String value)
        Parses the given string to a value and returns it. Different subtypes of Value will be returned depending on the string.
        Returns:
        a mutable Value
        Throws:
        IllegalArgumentException - if the given string is not parseable as a value

      • of

        public static Value of​(com.yahoo.tensor.Tensor tensor)

      • of

        public static Value of​(double scalar)