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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.predicate;
import java.util.List;
import java.util.Objects;
/**
* @author Simon Thoresen Hult
*/
public class Negation extends PredicateOperator {
private Predicate operand;
public Negation(Predicate operand) {
Objects.requireNonNull(operand, "operand");
this.operand = operand;
}
public Negation setOperand(Predicate operand) {
Objects.requireNonNull(operand, "operand");
this.operand = operand;
return this;
}
public Predicate getOperand() {
return operand;
}
@Override
public List<Predicate> getOperands() {
return java.util.Arrays.asList(operand);
}
@Override
public Negation clone() throws CloneNotSupportedException {
Negation obj = (Negation)super.clone();
obj.operand = operand.clone();
return obj;
}
@Override
public int hashCode() {
return operand.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Negation)) {
return false;
}
Negation rhs = (Negation)obj;
if (!operand.equals(rhs.operand)) {
return false;
}
return true;
}
@Override
protected void appendTo(StringBuilder out) {
if (operand instanceof FeatureSet) {
((FeatureSet)operand).appendNegatedTo(out);
} else {
out.append("not (");
operand.appendTo(out);
out.append(')');
}
}
}
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