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/*
* SPDX-FileCopyrightText: 2021-2024 The Refinery Authors <https://refinery.tools/>
*
* SPDX-License-Identifier: EPL-2.0
*/
package tools.refinery.logic.term.truthvalue;
import org.jetbrains.annotations.Nullable;
import tools.refinery.logic.AbstractValue;
public enum TruthValue implements AbstractValue<TruthValue, Boolean> {
TRUE("true"),
FALSE("false"),
UNKNOWN("unknown"),
ERROR("error");
private final String name;
TruthValue(String name) {
this.name = name;
}
public String getName() {
return name;
}
public static TruthValue toTruthValue(boolean value) {
return value ? TRUE : FALSE;
}
@Override
@Nullable
public Boolean getArbitrary() {
return switch (this) {
case TRUE -> true;
case FALSE, UNKNOWN -> false;
case ERROR -> null;
};
}
@Override
public boolean isError() {
return this == ERROR;
}
public boolean isConsistent() {
return !isError();
}
public boolean isComplete() {
return this != UNKNOWN;
}
@Override
@Nullable
public Boolean getConcrete() {
return switch (this) {
case TRUE -> true;
case FALSE -> false;
default -> null;
};
}
@Override
public boolean isConcrete() {
return this == TRUE || this == FALSE;
}
public boolean must() {
return this == TRUE || this == ERROR;
}
public boolean may() {
return this == TRUE || this == UNKNOWN;
}
public TruthValue not() {
return switch (this) {
case TRUE -> FALSE;
case FALSE -> TRUE;
default -> this;
};
}
@Override
public TruthValue join(TruthValue other) {
return switch (this) {
case TRUE -> other == ERROR || other == TRUE ? TRUE : UNKNOWN;
case FALSE -> other == ERROR || other == FALSE ? FALSE : UNKNOWN;
case UNKNOWN -> UNKNOWN;
case ERROR -> other;
};
}
@Override
public TruthValue meet(TruthValue other) {
return switch (this) {
case TRUE -> other == UNKNOWN || other == TRUE ? TRUE : ERROR;
case FALSE -> other == UNKNOWN || other == FALSE ? FALSE : ERROR;
case UNKNOWN -> other;
case ERROR -> ERROR;
};
}
}
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