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RetrievePolicyImportStrategy.java
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RetrievePolicyImportStrategy.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 java.util.Optional;
import javax.annotation.Nullable;
import org.eclipse.ditto.base.model.entity.metadata.Metadata;
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.PolicyImport;
import org.eclipse.ditto.policies.model.signals.commands.query.RetrievePolicyImport;
import org.eclipse.ditto.policies.model.signals.commands.query.RetrievePolicyImportResponse;
import org.eclipse.ditto.policies.model.signals.events.PolicyEvent;
import org.eclipse.ditto.policies.service.common.config.PolicyConfig;
/**
* This strategy handles the {@link RetrievePolicyImport} command.
*/
final class RetrievePolicyImportStrategy extends AbstractPolicyQueryCommandStrategy<RetrievePolicyImport> {
RetrievePolicyImportStrategy(final PolicyConfig policyConfig) {
super(RetrievePolicyImport.class, policyConfig);
}
@Override
protected Result<PolicyEvent<?>> doApply(final Context<PolicyId> context,
@Nullable final Policy policy,
final long nextRevision,
final RetrievePolicyImport command,
@Nullable final Metadata metadata) {
final PolicyId policyId = context.getState();
if (policy != null) {
final Optional<PolicyImport> optionalImport =
policy.getPolicyImports().getPolicyImport(command.getImportedPolicyId());
if (optionalImport.isPresent()) {
final WithDittoHeaders response = appendETagHeaderIfProvided(command,
RetrievePolicyImportResponse.of(policyId, optionalImport.get(), command.getDittoHeaders()),
policy);
return ResultFactory.newQueryResult(command, response);
}
}
return ResultFactory.newErrorResult(
policyImportNotFound(policyId, command.getImportedPolicyId(), command.getDittoHeaders()), command);
}
@Override
public Optional<EntityTag> nextEntityTag(final RetrievePolicyImport command, @Nullable final Policy newEntity) {
return Optional.ofNullable(newEntity)
.map(Policy::getPolicyImports)
.flatMap(im -> EntityTag.fromEntity(im.getPolicyImport(command.getImportedPolicyId()).orElse(null)));
}
}