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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.select;
import com.yahoo.document.select.rule.AttributeNode;
/**
* @author Simon Thoresen Hult
*/
public enum Result {
/**
* Defines all enumeration constants.
*/
TRUE,
FALSE,
INVALID;
@Override
public String toString() {
return name().toLowerCase();
}
/**
* Inverts the result value to the appropriate value. True → False, False → True and Invalid → Invalid.
* @return inverted result
*/
public static Result invert(Result result) {
if (result == Result.TRUE) return Result.FALSE;
if (result == Result.FALSE) return Result.TRUE;
return Result.INVALID;
}
/**
* Converts the given object value into an instance of this Result enumeration.
*
* @param value The object to convert.
* @return The corresponding result value.
*/
public static Result toResult(Object value) {
if (value == null || value == Result.FALSE || value == Boolean.FALSE ||
(value instanceof Number && ((Number)value).doubleValue() == 0)) {
return Result.FALSE;
} else if (value == INVALID) {
return Result.INVALID;
} else if (value instanceof AttributeNode.VariableValueList) {
return ((AttributeNode.VariableValueList)value).isEmpty() ? Result.FALSE : Result.TRUE;
} else if (value instanceof ResultList) {
return ((ResultList)value).toResult();
} else {
return Result.TRUE;
}
}
}
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