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ModifyResourceStrategy.java
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ModifyResourceStrategy.java
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/*
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.policies.service.persistence.actors.strategies.commands;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.util.Optional;
import javax.annotation.Nullable;
import org.eclipse.ditto.base.model.entity.metadata.Metadata;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.base.model.headers.entitytag.EntityTag;
import org.eclipse.ditto.json.JsonField;
import org.eclipse.ditto.json.JsonPointer;
import org.eclipse.ditto.policies.model.Label;
import org.eclipse.ditto.policies.model.Policy;
import org.eclipse.ditto.policies.model.PolicyEntry;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.Resource;
import org.eclipse.ditto.policies.api.PoliciesValidator;
import org.eclipse.ditto.policies.model.signals.commands.PolicyCommandSizeValidator;
import org.eclipse.ditto.policies.service.common.config.PolicyConfig;
import org.eclipse.ditto.internal.utils.persistentactors.results.Result;
import org.eclipse.ditto.internal.utils.persistentactors.results.ResultFactory;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyResource;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyResourceResponse;
import org.eclipse.ditto.policies.model.signals.events.PolicyEvent;
import org.eclipse.ditto.policies.model.signals.events.ResourceCreated;
import org.eclipse.ditto.policies.model.signals.events.ResourceModified;
/**
* This strategy handles the {@link org.eclipse.ditto.policies.model.signals.commands.modify.ModifyResource} command.
*/
final class ModifyResourceStrategy extends AbstractPolicyCommandStrategy<ModifyResource, PolicyEvent<?>> {
ModifyResourceStrategy(final PolicyConfig policyConfig) {
super(ModifyResource.class, policyConfig);
}
@Override
protected Result<PolicyEvent<?>> doApply(final Context<PolicyId> context,
@Nullable final Policy policy,
final long nextRevision,
final ModifyResource command,
@Nullable final Metadata metadata) {
final Policy nonNullPolicy = checkNotNull(policy, "policy");
final PolicyId policyId = context.getState();
final Label label = command.getLabel();
final Resource resource = command.getResource();
final DittoHeaders dittoHeaders = command.getDittoHeaders();
final Optional<PolicyEntry> optionalEntry = nonNullPolicy.getEntryFor(label);
if (optionalEntry.isPresent()) {
final JsonPointer resourcePointer = Policy.JsonFields.ENTRIES.getPointer()
.append(JsonPointer.of(label))
.append(PolicyEntry.JsonFields.RESOURCES.getPointer())
.append(JsonPointer.of(resource.getResourceKey()));
PolicyCommandSizeValidator.getInstance()
.ensureValidSize(nonNullPolicy, JsonField.newInstance(resourcePointer, resource.toJson()),
() -> dittoHeaders);
final PoliciesValidator validator =
PoliciesValidator.newInstance(nonNullPolicy.setResourceFor(label, resource));
if (validator.isValid()) {
final PolicyEntry policyEntry = optionalEntry.get();
final PolicyEvent<?> eventToPersist;
final ModifyResourceResponse rawResponse;
if (policyEntry.getResources().getResource(resource.getResourceKey()).isPresent()) {
rawResponse =
ModifyResourceResponse.modified(policyId, label, resource.getResourceKey(), dittoHeaders);
eventToPersist = ResourceModified.of(policyId, label, resource, nextRevision, getEventTimestamp(),
dittoHeaders, metadata);
} else {
rawResponse = ModifyResourceResponse.created(policyId, label, resource, dittoHeaders);
eventToPersist = ResourceCreated.of(policyId, label, resource, nextRevision, getEventTimestamp(),
dittoHeaders, metadata);
}
return ResultFactory.newMutationResult(command, eventToPersist,
appendETagHeaderIfProvided(command, rawResponse, nonNullPolicy));
} else {
return ResultFactory.newErrorResult(
policyEntryInvalid(policyId, label, validator.getReason().orElse(null), dittoHeaders), command);
}
} else {
return ResultFactory.newErrorResult(policyEntryNotFound(policyId, label, dittoHeaders), command);
}
}
@Override
public Optional<EntityTag> previousEntityTag(final ModifyResource command, @Nullable final Policy previousEntity) {
return Optional.ofNullable(previousEntity)
.flatMap(p -> p.getEntryFor(command.getLabel()))
.map(PolicyEntry::getResources)
.flatMap(r -> r.getResource(command.getResource().getResourceKey()))
.flatMap(EntityTag::fromEntity);
}
@Override
public Optional<EntityTag> nextEntityTag(final ModifyResource command, @Nullable final Policy newEntity) {
return Optional.of(command.getResource()).flatMap(EntityTag::fromEntity);
}
}