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ModifyPolicyImportsStrategy.java
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ModifyPolicyImportsStrategy.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.DittoHeaders;
import org.eclipse.ditto.base.model.headers.DittoHeadersBuilder;
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.JsonObject;
import org.eclipse.ditto.policies.api.PoliciesValidator;
import org.eclipse.ditto.policies.model.Policy;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.PolicyImports;
import org.eclipse.ditto.policies.model.PolicyTooLargeException;
import org.eclipse.ditto.policies.model.signals.commands.PolicyCommandSizeValidator;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyPolicyImports;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyPolicyImportsResponse;
import org.eclipse.ditto.policies.model.signals.events.PolicyEvent;
import org.eclipse.ditto.policies.model.signals.events.PolicyImportsModified;
import org.eclipse.ditto.policies.service.common.config.PolicyConfig;
/**
* This strategy handles the {@link ModifyPolicyImports} command.
*/
final class ModifyPolicyImportsStrategy extends AbstractPolicyCommandStrategy<ModifyPolicyImports, PolicyEvent<?>> {
ModifyPolicyImportsStrategy(final PolicyConfig policyConfig) {
super(ModifyPolicyImports.class, policyConfig);
}
@Override
protected Result<PolicyEvent<?>> doApply(final Context<PolicyId> context,
@Nullable final Policy entity,
final long nextRevision,
final ModifyPolicyImports command,
@Nullable final Metadata metadata) {
final PolicyImports policyImports = command.getPolicyImports();
final JsonObject policyImportsJson = policyImports.toJson();
try {
PolicyCommandSizeValidator.getInstance().ensureValidSize(
policyImportsJson::getUpperBoundForStringSize,
() -> policyImportsJson.toString().length(),
command::getDittoHeaders);
} catch (final PolicyTooLargeException e) {
return ResultFactory.newErrorResult(e, command);
}
final DittoHeadersBuilder<?, ?> adjustedHeadersBuilder = command.getDittoHeaders().toBuilder();
final DittoHeaders adjustedHeaders = adjustedHeadersBuilder.build();
final ModifyPolicyImports adjustedCommand = ModifyPolicyImports.of(command.getEntityId(),
policyImports,
adjustedHeaders);
final PoliciesValidator validator = PoliciesValidator.newInstance(entity);
if (validator.isValid()) {
final PolicyId policyId = context.getState();
final PolicyImportsModified policyImportsModified = PolicyImportsModified.of(policyId, policyImports,
nextRevision, getEventTimestamp(), adjustedHeaders, metadata);
final WithDittoHeaders response = appendETagHeaderIfProvided(adjustedCommand,
ModifyPolicyImportsResponse.modified(policyId, adjustedHeaders), entity);
return ResultFactory.newMutationResult(adjustedCommand, policyImportsModified, response);
} else {
return ResultFactory.newErrorResult(
policyInvalid(context.getState(), validator.getReason().orElse(null), adjustedHeaders),
command);
}
}
@Override
public Optional<EntityTag> previousEntityTag(final ModifyPolicyImports command,
@Nullable final Policy previousEntity) {
return Optional.ofNullable(previousEntity).map(Policy::getPolicyImports).flatMap(EntityTag::fromEntity);
}
@Override
public Optional<EntityTag> nextEntityTag(final ModifyPolicyImports command, @Nullable final Policy newEntity) {
return Optional.of(command.getPolicyImports()).flatMap(EntityTag::fromEntity);
}
}