software.amazon.smithy.diff.evaluators.AddedServiceError Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of smithy-diff Show documentation

This module detects differences between two Smithy models, identifying changes that are safe and changes that are backward incompatible.

The newest version!

/*
 * Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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 software.amazon.smithy.diff.evaluators;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import software.amazon.smithy.diff.ChangedShape;
import software.amazon.smithy.diff.Differences;
import software.amazon.smithy.model.shapes.ServiceShape;
import software.amazon.smithy.model.shapes.ShapeId;
import software.amazon.smithy.model.validation.ValidationEvent;

/**
 * Emits a warning when an error is added to a service.
 */
public final class AddedServiceError extends AbstractDiffEvaluator {
    @Override
    public List evaluate(Differences differences) {
        return differences.changedShapes(ServiceShape.class)
                .flatMap(change -> createErrorViolations(change).stream())
                .collect(Collectors.toList());
    }

    private List createErrorViolations(ChangedShape change) {
        if (change.getOldShape().getErrors().equals(change.getNewShape().getErrors())) {
            return Collections.emptyList();
        }

        List events = new ArrayList<>();
        for (ShapeId id : change.getNewShape().getErrors()) {
            if (!change.getOldShape().getErrors().contains(id)) {
                events.add(warning(change.getNewShape(), String.format(
                        "The `%s` error was added to the `%s` service, making this error common "
                        + "to all operations within the service. This is backward-compatible if the "
                        + "error is only encountered as a result of a change in behavior of "
                        + "the client (for example, the client sends a new "
                        + "parameter to an operation).",
                        id, change.getShapeId())));
            }
        }

        return events;
    }
}