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ValueEvaluator.java
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ValueEvaluator.java
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// Copyright 2023-2024 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package build.buf.protovalidate.internal.evaluator;
import build.buf.protovalidate.ValidationResult;
import build.buf.protovalidate.exceptions.ExecutionException;
import build.buf.validate.Violation;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* {@link ValueEvaluator} performs validation on any concrete value contained within a singular
* field, repeated elements, or the keys/values of a map.
*/
class ValueEvaluator implements Evaluator {
/** The default or zero-value for this value's type. */
@Nullable private Object zero;
/** The evaluators applied to a value. */
private final List<Evaluator> evaluators = new ArrayList<>();
/**
* Indicates that the Constraints should not be applied if the field is unset or the default
* (typically zero) value.
*/
private boolean ignoreEmpty;
/** Constructs a {@link ValueEvaluator}. */
ValueEvaluator() {}
@Override
public boolean tautology() {
return evaluators.isEmpty();
}
@Override
public ValidationResult evaluate(Value val, boolean failFast) throws ExecutionException {
if (this.shouldIgnore(val.value(Object.class))) {
return ValidationResult.EMPTY;
}
List<Violation> violations = new ArrayList<>();
for (Evaluator evaluator : evaluators) {
ValidationResult evalResult = evaluator.evaluate(val, failFast);
if (failFast && !evalResult.getViolations().isEmpty()) {
return evalResult;
}
violations.addAll(evalResult.getViolations());
}
if (violations.isEmpty()) {
return ValidationResult.EMPTY;
}
return new ValidationResult(violations);
}
/**
* Appends an evaluator to the list of evaluators.
*
* @param eval The evaluator to append.
*/
public void append(Evaluator eval) {
if (!eval.tautology()) {
this.evaluators.add(eval);
}
}
public void setIgnoreEmpty(Object zero) {
this.ignoreEmpty = true;
this.zero = zero;
}
private boolean shouldIgnore(Object value) {
return this.ignoreEmpty && Objects.equals(value, this.zero);
}
}