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ModifyPolicyImportStrategy.java
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ModifyPolicyImportStrategy.java
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/*
* Copyright (c) 2022 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 javax.annotation.concurrent.NotThreadSafe;
import org.eclipse.ditto.base.model.entity.metadata.Metadata;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.base.model.headers.WithDittoHeaders;
import org.eclipse.ditto.base.model.headers.entitytag.EntityTag;
import org.eclipse.ditto.internal.utils.persistentactors.results.Result;
import org.eclipse.ditto.internal.utils.persistentactors.results.ResultFactory;
import org.eclipse.ditto.json.JsonField;
import org.eclipse.ditto.json.JsonPointer;
import org.eclipse.ditto.policies.model.Policy;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.PolicyImport;
import org.eclipse.ditto.policies.model.signals.commands.PolicyCommandSizeValidator;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyPolicyImport;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyPolicyImportResponse;
import org.eclipse.ditto.policies.model.signals.events.PolicyEvent;
import org.eclipse.ditto.policies.model.signals.events.PolicyImportCreated;
import org.eclipse.ditto.policies.model.signals.events.PolicyImportModified;
import org.eclipse.ditto.policies.service.common.config.PolicyConfig;
/**
* This strategy handles the {@link ModifyPolicyImport} command.
*/
@NotThreadSafe
final class ModifyPolicyImportStrategy extends AbstractPolicyCommandStrategy<ModifyPolicyImport, PolicyEvent<?>> {
ModifyPolicyImportStrategy(final PolicyConfig policyConfig) {
super(ModifyPolicyImport.class, policyConfig);
}
@Override
protected Result<PolicyEvent<?>> doApply(final Context<PolicyId> context,
@Nullable final Policy policy,
final long nextRevision,
final ModifyPolicyImport command,
@Nullable final Metadata metadata) {
final Policy nonNullPolicy = checkNotNull(policy, "policy");
final PolicyImport policyImport = command.getPolicyImport();
final JsonPointer importPointer = Policy.JsonFields.IMPORTS.getPointer()
.append(JsonPointer.of(policyImport.getImportedPolicyId()));
PolicyCommandSizeValidator.getInstance()
.ensureValidSize(nonNullPolicy, JsonField.newInstance(importPointer, policyImport.toJson()),
command::getDittoHeaders);
final PolicyId policyId = context.getState();
final PolicyId importedPolicyId = policyImport.getImportedPolicyId();
final DittoHeaders dittoHeaders = command.getDittoHeaders();
final PolicyEvent<?> eventToPersist;
final ModifyPolicyImportResponse createdOrModifiedResponse;
if (nonNullPolicy.getPolicyImports().getPolicyImport(importedPolicyId).isPresent()) {
eventToPersist =
PolicyImportModified.of(policyId, policyImport, nextRevision, getEventTimestamp(), dittoHeaders,
metadata);
createdOrModifiedResponse = ModifyPolicyImportResponse.modified(policyId, importedPolicyId, dittoHeaders);
} else {
eventToPersist =
PolicyImportCreated.of(policyId, policyImport, nextRevision, getEventTimestamp(), dittoHeaders,
metadata);
createdOrModifiedResponse = ModifyPolicyImportResponse.created(policyId, policyImport, dittoHeaders);
}
final WithDittoHeaders response = appendETagHeaderIfProvided(command, createdOrModifiedResponse, nonNullPolicy);
return ResultFactory.newMutationResult(command, eventToPersist, response);
}
@Override
public Optional<EntityTag> previousEntityTag(final ModifyPolicyImport command,
@Nullable final Policy previousEntity) {
return Optional.ofNullable(previousEntity)
.flatMap(p -> EntityTag.fromEntity(
p.getEntryFor(command.getPolicyImport().getImportedPolicyId()).orElse(null)));
}
@Override
public Optional<EntityTag> nextEntityTag(final ModifyPolicyImport command, @Nullable final Policy newEntity) {
return Optional.of(command.getPolicyImport()).flatMap(EntityTag::fromEntity);
}
}