software.amazon.smithy.model.validation.validators.SingleResourceBindingValidator Maven / Gradle / Ivy

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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.model.validation.validators;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import software.amazon.smithy.model.Model;
import software.amazon.smithy.model.knowledge.TopDownIndex;
import software.amazon.smithy.model.shapes.ResourceShape;
import software.amazon.smithy.model.shapes.ServiceShape;
import software.amazon.smithy.model.shapes.ShapeId;
import software.amazon.smithy.model.validation.AbstractValidator;
import software.amazon.smithy.model.validation.ValidationEvent;
import software.amazon.smithy.model.validation.ValidationUtils;

/**
 * Validates that a resource is only bound to once in an entire
 * service closure.
 */
public final class SingleResourceBindingValidator extends AbstractValidator {

    @Override
    public List validate(Model model) {
        TopDownIndex topDownIndex = TopDownIndex.of(model);
        return model.shapes(ServiceShape.class)
                .flatMap(shape -> validateService(topDownIndex, shape).stream())
                .collect(Collectors.toList());
    }

    private List validateService(TopDownIndex topDownIndex, ServiceShape service) {
        List events = new ArrayList<>();
        for (ResourceShape resource : topDownIndex.getContainedResources(service)) {
            Set containers = new HashSet<>();
            if (service.getResources().contains(resource.getId())) {
                containers.add(service.getId());
            }

            for (ResourceShape otherResource : topDownIndex.getContainedResources(service)) {
                if (otherResource.getResources().contains(resource.getId())) {
                    containers.add(otherResource.getId());
                }
            }

            if (containers.size() > 1) {
                events.add(error(resource, String.format(
                        "A resource can appear only once in an entire service closure. This resource is "
                        + "illegally bound into the `%s` service closure from multiple shapes: [%s]",
                        service.getId(), ValidationUtils.tickedList(containers))));
            }
        }
        return events;
    }
}