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Common Expression Language Runtime for Java

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// Copyright 2023 Google LLC
//
// 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
//
//      https://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 dev.cel.common.values;

import com.google.errorprone.annotations.Immutable;
import com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.Descriptors.FieldDescriptor;
import com.google.protobuf.Message;
import dev.cel.common.CelErrorCode;
import dev.cel.common.CelOptions;
import dev.cel.common.CelRuntimeException;
import dev.cel.common.annotations.Internal;
import dev.cel.common.internal.DynamicProto;
import dev.cel.common.internal.ProtoAdapter;
import dev.cel.common.internal.ProtoMessageFactory;
import java.util.Map;
import java.util.Optional;

/**
 * {@link ProtoMessageValueProvider} constructs new instances of a protobuf message given its fully
 * qualified name and its fields to populate.
 *
 * CEL Library Internals. Do Not Use.
 */
@Immutable
@Internal
public class ProtoMessageValueProvider implements CelValueProvider {
  private final ProtoAdapter protoAdapter;
  private final ProtoMessageFactory protoMessageFactory;
  private final ProtoCelValueConverter protoCelValueConverter;

  @Override
  public Optional newValue(String structType, Map fields) {
    try {
      Message.Builder builder = getMessageBuilderOrThrow(structType);
      Descriptor descriptor = builder.getDescriptorForType();
      for (Map.Entry entry : fields.entrySet()) {
        FieldDescriptor fieldDescriptor = findField(descriptor, entry.getKey());
        Optional