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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.rankingexpression.rule;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import java.util.List;
/**
* A mathematical operator
*
* @author bratseth
*/
public enum ArithmeticOperator {
OR(0, "||") { public Value evaluate(Value x, Value y) {
return x.or(y);
}},
AND(1, "&&") { public Value evaluate(Value x, Value y) {
return x.and(y);
}},
PLUS(2, "+") { public Value evaluate(Value x, Value y) {
return x.add(y);
}},
MINUS(3, "-") { public Value evaluate(Value x, Value y) {
return x.subtract(y);
}},
MULTIPLY(4, "*") { public Value evaluate(Value x, Value y) {
return x.multiply(y);
}},
DIVIDE(5, "/") { public Value evaluate(Value x, Value y) {
return x.divide(y);
}},
MODULO(6, "%") { public Value evaluate(Value x, Value y) {
return x.modulo(y);
}},
POWER(7, "^") { public Value evaluate(Value x, Value y) {
return x.power(y);
}};
/** A list of all the operators in this in order of decreasing precedence */
public static final List<ArithmeticOperator> operatorsByPrecedence = List.of(POWER, MODULO, DIVIDE, MULTIPLY, MINUS, PLUS, AND, OR);
private final int precedence;
private final String image;
private ArithmeticOperator(int precedence, String image) {
this.precedence = precedence;
this.image = image;
}
/** Returns true if this operator has precedence over the given operator */
public boolean hasPrecedenceOver(ArithmeticOperator op) {
return precedence > op.precedence;
}
public abstract Value evaluate(Value x, Value y);
@Override
public String toString() {
return image;
}
}
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