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DeletePolicyImportStrategy.java
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DeletePolicyImportStrategy.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 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.policies.model.Policy;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.signals.commands.modify.DeletePolicyImport;
import org.eclipse.ditto.policies.model.signals.commands.modify.DeletePolicyImportResponse;
import org.eclipse.ditto.policies.model.signals.events.PolicyEvent;
import org.eclipse.ditto.policies.model.signals.events.PolicyImportDeleted;
import org.eclipse.ditto.policies.service.common.config.PolicyConfig;
/**
* This strategy handles the {@link DeletePolicyImport} command.
*/
final class DeletePolicyImportStrategy extends AbstractPolicyCommandStrategy<DeletePolicyImport, PolicyEvent<?>> {
DeletePolicyImportStrategy(final PolicyConfig policyConfig) {
super(DeletePolicyImport.class, policyConfig);
}
@Override
protected Result<PolicyEvent<?>> doApply(final Context<PolicyId> context,
@Nullable final Policy policy,
final long nextRevision,
final DeletePolicyImport command,
@Nullable final Metadata metadata) {
final Policy nonNullPolicy = checkNotNull(policy, "policy");
final DittoHeaders dittoHeaders = command.getDittoHeaders();
final PolicyId importedPolicyId = command.getImportedPolicyId();
final PolicyId policyId = context.getState();
if (nonNullPolicy.contains(importedPolicyId)) {
final PolicyImportDeleted policyImportDeleted =
PolicyImportDeleted.of(policyId, importedPolicyId, nextRevision, getEventTimestamp(), dittoHeaders,
metadata);
final WithDittoHeaders response = appendETagHeaderIfProvided(command,
DeletePolicyImportResponse.of(policyId, importedPolicyId, dittoHeaders), nonNullPolicy);
return ResultFactory.newMutationResult(command, policyImportDeleted, response);
} else {
return ResultFactory.newErrorResult(policyImportNotFound(policyId, importedPolicyId, dittoHeaders),
command);
}
}
@Override
public Optional<EntityTag> previousEntityTag(final DeletePolicyImport command,
@Nullable final Policy previousEntity) {
return Optional.ofNullable(previousEntity)
.flatMap(Policy::getPolicyImports)
.flatMap(im -> EntityTag.fromEntity(im.getPolicyImport(command.getImportedPolicyId()).orElse(null)));
}
@Override
public Optional<EntityTag> nextEntityTag(final DeletePolicyImport command, @Nullable final Policy newEntity) {
return Optional.empty();
}
}