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RuleEvaluator.java
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RuleEvaluator.java
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package cloud.eppo.android;
import com.github.zafarkhaja.semver.Version;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import cloud.eppo.android.dto.EppoValue;
import cloud.eppo.android.dto.SubjectAttributes;
import cloud.eppo.android.dto.TargetingCondition;
import cloud.eppo.android.dto.TargetingRule;
interface IConditionFunc<T> {
boolean check(T a, T b);
}
class Compare {
public static boolean compareRegex(String a, Pattern pattern) {
return pattern.matcher(a).matches();
}
public static boolean isOneOf(String a, List<String> values) {
for (String value : values) {
if (value.equalsIgnoreCase(a)) {
return true;
}
}
return false;
}
}
public class RuleEvaluator {
public static TargetingRule findMatchingRule(SubjectAttributes subjectAttributes, List<TargetingRule> rules) {
for (TargetingRule rule : rules) {
if (matchesRule(subjectAttributes, rule)) {
return rule;
}
}
return null;
}
private static boolean matchesRule(SubjectAttributes subjectAttributes, TargetingRule rule) {
List<Boolean> conditionEvaluations = evaluateRuleConditions(subjectAttributes, rule.getConditions());
return !conditionEvaluations.contains(false);
}
private static boolean evaluateCondition(SubjectAttributes subjectAttributes, TargetingCondition condition
) {
if (subjectAttributes.containsKey(condition.getAttribute())) {
EppoValue value = subjectAttributes.get(condition.getAttribute());
Boolean isValueSemVer = Version.isValid(value.stringValue());
Boolean isConditionSemVer = Version.isValid(condition.getValue().stringValue());
try {
switch (condition.getOperator()) {
case GreaterThanEqualTo:
if (value.isNumeric() && condition.getValue().isNumeric()) {
return value.doubleValue() >= condition.getValue().doubleValue();
}
if (isValueSemVer && isConditionSemVer) {
return Version.parse(value.stringValue()).isHigherThanOrEquivalentTo(Version.parse(condition.getValue().stringValue()));
}
return false;
case GreaterThan:
if (value.isNumeric() && condition.getValue().isNumeric()) {
return value.doubleValue() > condition.getValue().doubleValue();
}
if (isValueSemVer && isConditionSemVer) {
return Version.parse(value.stringValue()).isHigherThan(Version.parse(condition.getValue().stringValue()));
}
return false;
case LessThanEqualTo:
if (value.isNumeric() && condition.getValue().isNumeric()) {
return value.doubleValue() <= condition.getValue().doubleValue();
}
if (isValueSemVer && isConditionSemVer) {
return Version.parse(value.stringValue()).isLowerThanOrEquivalentTo(Version.parse(condition.getValue().stringValue()));
}
return false;
case LessThan:
if (value.isNumeric() && condition.getValue().isNumeric()) {
return value.doubleValue() < condition.getValue().doubleValue();
}
if (isValueSemVer && isConditionSemVer) {
return Version.parse(value.stringValue()).isLowerThan(Version.parse(condition.getValue().stringValue()));
}
return false;
case Matches:
return Compare.compareRegex(value.stringValue(), Pattern.compile(condition.getValue().stringValue()));
case OneOf:
return Compare.isOneOf(value.stringValue(), condition.getValue().arrayValue());
case NotOneOf:
return !Compare.isOneOf(value.stringValue(), condition.getValue().arrayValue());
default:
throw new IllegalStateException("Unexpected value: " + condition.getOperator());
}
} catch (Exception e) {
return false;
}
}
return false;
}
private static List<Boolean> evaluateRuleConditions(SubjectAttributes subjectAttributes, List<TargetingCondition> conditions) {
List<Boolean> evaluations = new ArrayList<>();
for (TargetingCondition condition : conditions) {
evaluations.add(evaluateCondition(subjectAttributes, condition));
}
return evaluations;
}
}