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Google Api eXtensions for Java
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/*
 * Copyright 2020 Google LLC
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google LLC nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.google.api.gax.httpjson;

import com.google.api.core.ApiFunction;
import com.google.api.gax.longrunning.OperationSnapshot;
import com.google.api.gax.rpc.ApiExceptionFactory;
import com.google.api.gax.rpc.StatusCode.Code;
import com.google.protobuf.Any;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.Message;

/** Public for technical reasons; intended for use by generated code. */
public class ProtoOperationTransformers {
  private ProtoOperationTransformers() {}

  public static class ResponseTransformer
      implements ApiFunction {
    private final AnyTransformer transformer;

    private ResponseTransformer(Class packedClass) {
      this.transformer = new AnyTransformer<>(packedClass);
    }

    @Override
    public ResponseT apply(OperationSnapshot operationSnapshot) {
      if (!operationSnapshot.getErrorCode().getCode().equals(Code.OK)) {
        throw ApiExceptionFactory.createException(
            "Operation with name \""
                + operationSnapshot.getName()
                + "\" failed with status = "
                + operationSnapshot.getErrorCode()
                + " and message = "
                + operationSnapshot.getErrorMessage(),
            null,
            operationSnapshot.getErrorCode(),
            false);
      }

      if (!(operationSnapshot.getResponse() instanceof Any)) {
        return (ResponseT) operationSnapshot.getResponse();
      }

      try {
        return transformer.apply((Any) operationSnapshot.getResponse());
      } catch (RuntimeException e) {
        throw ApiExceptionFactory.createException(
            "Operation with name \""
                + operationSnapshot.getName()
                + "\" succeeded, but encountered a problem unpacking it.",
            e,
            operationSnapshot.getErrorCode(),
            false);
      }
    }

    public static  ResponseTransformer create(
        Class packedClass) {
      return new ResponseTransformer<>(packedClass);
    }
  }

  public static class MetadataTransformer
      implements ApiFunction {
    private final AnyTransformer transformer;

    private MetadataTransformer(Class packedClass) {
      this.transformer = new AnyTransformer<>(packedClass);
    }

    @Override
    public MetadataT apply(OperationSnapshot operationSnapshot) {
      if (!(operationSnapshot.getMetadata() instanceof Any)) {
        return (MetadataT) operationSnapshot.getMetadata();
      }
      try {
        return transformer.apply((Any) operationSnapshot.getMetadata());
      } catch (RuntimeException e) {
        throw ApiExceptionFactory.createException(
            "Polling operation with name \""
                + operationSnapshot.getName()
                + "\" succeeded, but encountered a problem unpacking it.",
            e,
            operationSnapshot.getErrorCode(),
            false);
      }
    }

    public static  MetadataTransformer create(
        Class packedClass) {
      return new MetadataTransformer<>(packedClass);
    }
  }

  static class AnyTransformer implements ApiFunction {
    private final Class packedClass;

    public AnyTransformer(Class packedClass) {
      this.packedClass = packedClass;
    }

    @Override
    public PackedT apply(Any input) {
      try {
        return input == null || packedClass == null ? null : input.unpack(packedClass);
      } catch (InvalidProtocolBufferException | ClassCastException e) {
        throw new IllegalStateException(
            "Failed to unpack object from 'any' field. Expected "
                + packedClass.getName()
                + ", found "
                + input.getTypeUrl());
      }
    }
  }
}