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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.models.evaluation;
import java.util.Objects;
import java.util.Optional;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* A reference to a function.
* The function may be
* - free: Callable from users of models, or
* - bound: Representing a specific invocation from another ranking expression.
* In bound functions, any arguments are replaced by the values supplied in the function invocation.
* Function references has a serial form (textual representation) used in ranking expressions received in ranking
* expression configurations.
*
* This is immutable.
*
* @author bratseth
*/
class FunctionReference {
private static final Pattern referencePattern =
Pattern.compile("rankingExpression\\(([a-zA-Z0-9_.]+)(@[a-f0-9]+\\.[a-f0-9]+)?\\)(\\.rankingScript)?");
/** The name of the function referenced */
private final String name;
/** The id of the specific invocation of the function, or null if it is free */
private final String instance;
private FunctionReference(String name, String instance) {
this.name = name;
this.instance = instance;
}
/** Returns the name of the function referenced */
String functionName() { return name; }
boolean isFree() {
return instance == null;
}
String serialForm() {
return "rankingExpression(" + name + (instance != null ? instance : "") + ")";
}
@Override
public String toString() { return "reference to function '" + name + "'" +
( instance != null ? " instance '" + instance + "'" : ""); }
@Override
public int hashCode() { return Objects.hash(name, instance); }
@Override
public boolean equals(Object o) {
if (o == this) return true;
if ( ! (o instanceof FunctionReference)) return false;
FunctionReference other = (FunctionReference)o;
if ( ! Objects.equals(this.name, other.name)) return false;
if ( ! Objects.equals(this.instance, other.instance)) return false;
return true;
}
/** Returns a function reference from the given serial form, or empty if the string is not a valid reference */
static Optional<FunctionReference> fromSerial(String serialForm) {
Matcher expressionMatcher = referencePattern.matcher(serialForm);
if ( ! expressionMatcher.matches()) return Optional.empty();
String name = expressionMatcher.group(1);
String instance = expressionMatcher.group(2);
return Optional.of(new FunctionReference(name, instance));
}
}
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