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+/*
+ * Copyright 2023 Code Intelligence GmbH
+ *
+ * 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 com.code_intelligence.jazzer.mutation.api;
+
+import static com.code_intelligence.jazzer.mutation.support.Preconditions.require;
+import static com.code_intelligence.jazzer.mutation.support.TypeSupport.asAnnotatedType;
+import static java.lang.String.format;
+
+import com.google.errorprone.annotations.CheckReturnValue;
+import java.lang.reflect.AnnotatedType;
+import java.util.Optional;
+
+/**
+ * Instances of this class are not required to be thread safe, but are generally lightweight and can
+ * thus be created as needed.
+ */
+public abstract class MutatorFactory {
+ public final boolean canMutate(AnnotatedType type) {
+ return tryCreate(type).isPresent();
+ }
+
+ public final <T> SerializingMutator<T> createOrThrow(Class<T> clazz) {
+ return (SerializingMutator<T>) createOrThrow(asAnnotatedType(clazz));
+ }
+
+ public final SerializingMutator<?> createOrThrow(AnnotatedType type) {
+ Optional<SerializingMutator<?>> maybeMutator = tryCreate(type);
+ require(maybeMutator.isPresent(), "Failed to create mutator for " + type);
+ return maybeMutator.get();
+ }
+
+ public final SerializingInPlaceMutator<?> createInPlaceOrThrow(AnnotatedType type) {
+ Optional<SerializingInPlaceMutator<?>> maybeMutator = tryCreateInPlace(type);
+ require(maybeMutator.isPresent(), "Failed to create mutator for " + type);
+ return maybeMutator.get();
+ }
+
+ /**
+ * Tries to create a mutator for {@code type} and, if successful, asserts that it is an instance
+ * of {@link SerializingInPlaceMutator}.
+ */
+ public final Optional<SerializingInPlaceMutator<?>> tryCreateInPlace(AnnotatedType type) {
+ return tryCreate(type).map(mutator -> {
+ require(mutator instanceof InPlaceMutator<?>,
+ format("Mutator for %s is not in-place: %s", type, mutator.getClass()));
+ return (SerializingInPlaceMutator<?>) mutator;
+ });
+ }
+
+ @CheckReturnValue
+ public final Optional<SerializingMutator<?>> tryCreate(AnnotatedType type) {
+ return tryCreate(type, this);
+ }
+
+ /**
+ * Attempt to create a {@link SerializingMutator} for the given type.
+ *
+ * @param type the type to mutate
+ * @param factory the factory to use when creating submutators
+ * @return a {@link SerializingMutator} for the given {@code type}, or {@link Optional#empty()}
+ * if this factory can't create such mutators
+ */
+ @CheckReturnValue
+ public abstract Optional<SerializingMutator<?>> tryCreate(
+ AnnotatedType type, MutatorFactory factory);
+}