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ModifySubjectStrategy.java
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ModifySubjectStrategy.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.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.api.PoliciesValidator;
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.Subject;
import org.eclipse.ditto.policies.model.signals.commands.PolicyCommandSizeValidator;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifySubject;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifySubjectResponse;
import org.eclipse.ditto.policies.model.signals.events.PolicyEvent;
import org.eclipse.ditto.policies.model.signals.events.SubjectCreated;
import org.eclipse.ditto.policies.model.signals.events.SubjectModified;
import org.eclipse.ditto.policies.service.common.config.PolicyConfig;
/**
* This strategy handles the {@link org.eclipse.ditto.policies.model.signals.commands.modify.ModifySubject} command.
*/
final class ModifySubjectStrategy extends AbstractPolicyCommandStrategy<ModifySubject, PolicyEvent<?>> {
ModifySubjectStrategy(final PolicyConfig policyConfig) {
super(ModifySubject.class, policyConfig);
}
@Override
protected Result<PolicyEvent<?>> doApply(final Context<PolicyId> context,
@Nullable final Policy policy,
final long nextRevision,
final ModifySubject command,
@Nullable final Metadata metadata) {
final Policy nonNullPolicy = checkNotNull(policy, "policy");
final PolicyId policyId = context.getState();
final Label label = command.getLabel();
final Subject subject = command.getSubject();
final DittoHeaders commandHeaders = command.getDittoHeaders();
final Optional<PolicyEntry> optionalEntry = nonNullPolicy.getEntryFor(label);
if (optionalEntry.isPresent()) {
final JsonPointer resourcesPointer = Policy.JsonFields.ENTRIES.getPointer()
.append(JsonPointer.of(label))
.append(PolicyEntry.JsonFields.SUBJECTS.getPointer())
.append(JsonPointer.of(subject.getId()));
PolicyCommandSizeValidator.getInstance()
.ensureValidSize(nonNullPolicy, JsonField.newInstance(resourcesPointer, subject.toJson()),
() -> commandHeaders);
final PolicyEntry policyEntry = optionalEntry.get();
final Subject adjustedSubject = potentiallyAdjustSubject(subject);
final ModifySubject adjustedCommand = ModifySubject.of(
command.getEntityId(), command.getLabel(), adjustedSubject, commandHeaders);
final Policy newPolicy = nonNullPolicy.setSubjectFor(label, adjustedSubject);
final Optional<Result<PolicyEvent<?>>> alreadyExpiredSubject =
checkForAlreadyExpiredSubject(newPolicy, commandHeaders, command);
if (alreadyExpiredSubject.isPresent()) {
return alreadyExpiredSubject.get();
}
final PoliciesValidator validator = PoliciesValidator.newInstance(newPolicy);
if (validator.isValid()) {
final PolicyEvent<?> event;
final ModifySubjectResponse rawResponse;
if (policyEntry.getSubjects().getSubject(adjustedSubject.getId()).isPresent()) {
rawResponse = ModifySubjectResponse.modified(policyId, label, adjustedSubject.getId(),
commandHeaders);
event = SubjectModified.of(policyId, label, adjustedSubject, nextRevision, getEventTimestamp(),
commandHeaders, metadata);
} else {
rawResponse = ModifySubjectResponse.created(policyId, label, adjustedSubject, commandHeaders);
event = SubjectCreated.of(policyId, label, adjustedSubject, nextRevision, getEventTimestamp(),
commandHeaders, metadata);
}
return ResultFactory.newMutationResult(adjustedCommand, event,
appendETagHeaderIfProvided(adjustedCommand, rawResponse, nonNullPolicy));
} else {
return ResultFactory.newErrorResult(
policyEntryInvalid(policyId, label, validator.getReason().orElse(null), commandHeaders),
command);
}
} else {
return ResultFactory.newErrorResult(policyEntryNotFound(policyId, label, command.getDittoHeaders()),
command);
}
}
@Override
public Optional<EntityTag> previousEntityTag(final ModifySubject command, @Nullable final Policy previousEntity) {
return Optional.ofNullable(previousEntity)
.flatMap(p -> p.getEntryFor(command.getLabel()))
.flatMap(entry -> entry.getSubjects().getSubject(command.getSubject().getId()))
.flatMap(EntityTag::fromEntity);
}
@Override
public Optional<EntityTag> nextEntityTag(final ModifySubject command, @Nullable final Policy newEntity) {
return Optional.of(command.getSubject()).flatMap(EntityTag::fromEntity);
}
}