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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.models.evaluation;
import com.yahoo.searchlib.rankingexpression.evaluation.Context;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import com.yahoo.searchlib.rankingexpression.rule.Function;
import com.yahoo.tensor.Tensor;
import com.yahoo.tensor.TensorType;
/**
* A Value which is computed from an expression when first requested.
* This is not multithread safe.
*
* @author bratseth
*/
class LazyValue extends Value {
/** The reference to the function computing the value of this */
private final FunctionReference function;
/** The context used to compute the function of this */
private final Context context;
/** The model this is part of */
private final Model model;
private Value computedValue = null;
public LazyValue(FunctionReference function, Context context, Model model) {
this.function = function;
this.context = context;
this.model = model;
}
private Value computedValue() {
if (computedValue == null)
computedValue = model.requireReferencedFunction(function).getBody().evaluate(context);
return computedValue;
}
@Override
public TensorType type() {
return model.requireReferencedFunction(function).returnType().get();
}
@Override
public double asDouble() {
return computedValue().asDouble();
}
@Override
public Tensor asTensor() {
return computedValue().asTensor();
}
@Override
public boolean hasDouble() {
return type().rank() == 0;
}
@Override
public boolean asBoolean() {
return computedValue().asBoolean();
}
@Override
public Value negate() {
return computedValue().negate();
}
@Override
public Value not() {
return computedValue().not();
}
@Override
public Value or(Value value) {
return computedValue().or(value);
}
@Override
public Value and(Value value) {
return computedValue().and(value);
}
@Override
public Value largerOrEqual(Value value) {
return computedValue().largerOrEqual(value);
}
@Override
public Value larger(Value value) {
return computedValue().larger(value);
}
@Override
public Value smallerOrEqual(Value value) {
return computedValue().smallerOrEqual(value);
}
@Override
public Value smaller(Value value) {
return computedValue().smaller(value);
}
@Override
public Value approxEqual(Value value) {
return computedValue().approxEqual(value);
}
@Override
public Value notEqual(Value value) {
return computedValue().notEqual(value);
}
@Override
public Value equal(Value value) {
return computedValue().equal(value);
}
@Override
public Value add(Value value) {
return computedValue().add(value);
}
@Override
public Value subtract(Value value) {
return computedValue().subtract(value);
}
@Override
public Value multiply(Value value) {
return computedValue().multiply(value);
}
@Override
public Value divide(Value value) {
return computedValue().divide(value);
}
@Override
public Value modulo(Value value) {
return computedValue().modulo(value);
}
@Override
public Value power(Value value) {
return computedValue().power(value);
}
@Override
public Value function(Function function, Value value) {
return computedValue().function(function, value);
}
@Override
public Value asMutable() {
return computedValue().asMutable();
}
@Override
public String toString() {
return "value of " + function;
}
@Override
public boolean equals(Object other) {
if (other == this) return true;
if (!(other instanceof Value)) return false;
return computedValue().equals(other);
}
@Override
public int hashCode() {
return computedValue().hashCode();
}
LazyValue copyFor(Context context) {
return new LazyValue(this.function, context, model);
}
}
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