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

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This module detects differences between two Smithy models, identifying changes that are safe and changes that are backward incompatible.
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/*
 * Copyright 2019 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.HashSet;
import java.util.List;
import java.util.Set;
import software.amazon.smithy.diff.ChangedShape;
import software.amazon.smithy.diff.Differences;
import software.amazon.smithy.model.shapes.EntityShape;
import software.amazon.smithy.model.shapes.ShapeId;
import software.amazon.smithy.model.shapes.ShapeType;
import software.amazon.smithy.model.validation.Severity;
import software.amazon.smithy.model.validation.ValidationEvent;

/**
 * A meta-validator that checks for the removal of an operation or
 * resource binding from a service or resource.
 *
 * A "RemovedOperationBinding" eventId is used when an operation is
 * removed, and a "RemovedResourceBinding" eventId is used when a
 * resource is removed.
 */
public final class RemovedEntityBinding extends AbstractDiffEvaluator {
    private static final String REMOVED_RESOURCE = "RemovedResourceBinding";
    private static final String REMOVED_OPERATION = "RemovedOperationBinding";
    private static final String FROM_RESOURCE = ".FromResource.";
    private static final String FROM_SERVICE = ".FromService.";

    @Override
    public List evaluate(Differences differences) {
        List events = new ArrayList<>();
        differences.changedShapes(EntityShape.class).forEach(change -> validateOperation(change, events));
        return events;
    }

    private void validateOperation(ChangedShape change, List events) {
        findRemoved(change.getOldShape().getOperations(), change.getNewShape().getOperations())
                .forEach(removed -> events.add(createRemovedEvent(REMOVED_OPERATION, change.getNewShape(), removed)));

        findRemoved(change.getOldShape().getResources(), change.getNewShape().getResources())
                .forEach(removed -> events.add(createRemovedEvent(REMOVED_RESOURCE, change.getNewShape(), removed)));
    }

    private Set findRemoved(Set oldShapes, Set newShapes) {
        Set removed = new HashSet<>(oldShapes);
        removed.removeAll(newShapes);
        return removed;
    }

    private ValidationEvent createRemovedEvent(String typeOfRemoval, EntityShape parentEntity, ShapeId childShape) {
        String childType = typeOfRemoval.equals(REMOVED_RESOURCE) ? "Resource" : "Operation";
        String typeOfParentShape = ShapeType.RESOURCE.equals(parentEntity.getType()) ? FROM_RESOURCE : FROM_SERVICE;
        String message = String.format(
                "%s binding of `%s` was removed from %s shape, `%s`",
                childType, childShape, parentEntity.getType(), parentEntity.getId());
        return ValidationEvent.builder()
                .id(typeOfRemoval + typeOfParentShape + childShape.getName())
                .severity(Severity.ERROR)
                .shape(parentEntity)
                .message(message)
                .build();
    }
}