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ModifyThingSubstitutionStrategy.java
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ModifyThingSubstitutionStrategy.java
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/*
* Copyright (c) 2017 Bosch Software Innovations GmbH.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/org/documents/epl-2.0/index.php
*
* Contributors:
* Bosch Software Innovations GmbH - initial contribution
*/
package org.eclipse.ditto.services.concierge.enforcement.placeholders.strategies;
import static java.util.Objects.requireNonNull;
import java.util.Objects;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.model.base.headers.DittoHeaders;
import org.eclipse.ditto.model.base.headers.WithDittoHeaders;
import org.eclipse.ditto.model.policies.PoliciesModelFactory;
import org.eclipse.ditto.model.policies.Policy;
import org.eclipse.ditto.model.things.Thing;
import org.eclipse.ditto.services.concierge.enforcement.placeholders.HeaderBasedPlaceholderSubstitutionAlgorithm;
import org.eclipse.ditto.signals.commands.things.modify.ModifyThing;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Handles substitution for {@link org.eclipse.ditto.model.policies.SubjectId}
* inside a {@link ModifyThing} command.
*/
final class ModifyThingSubstitutionStrategy extends AbstractTypedSubstitutionStrategy<ModifyThing> {
private static final Logger LOGGER = LoggerFactory.getLogger(ModifyThingSubstitutionStrategy.class);
ModifyThingSubstitutionStrategy() {
super(ModifyThing.class);
}
@Override
public WithDittoHeaders apply(final ModifyThing modifyThing,
final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm) {
requireNonNull(modifyThing);
requireNonNull(substitutionAlgorithm);
final DittoHeaders dittoHeaders = modifyThing.getDittoHeaders();
final JsonObject inlinePolicyJson = modifyThing.getInitialPolicy().orElse(null);
final JsonObject substitutedInlinePolicyJson;
if (inlinePolicyJson == null) {
substitutedInlinePolicyJson = null;
} else {
substitutedInlinePolicyJson =
substituteInitialPolicy(inlinePolicyJson, substitutionAlgorithm, dittoHeaders);
}
final Thing existingThing = modifyThing.getThing();
final Thing substitutedThing = substituteThing(existingThing, substitutionAlgorithm, dittoHeaders);
if (existingThing.equals(substitutedThing) && Objects.equals(inlinePolicyJson, substitutedInlinePolicyJson)) {
return modifyThing;
} else {
return ModifyThing.of(modifyThing.getThingId(), substitutedThing,
substitutedInlinePolicyJson, dittoHeaders);
}
}
private static JsonObject substituteInitialPolicy(final JsonObject initialPolicy,
final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm,
final DittoHeaders dittoHeaders) {
Policy existingPolicy;
try {
existingPolicy = PoliciesModelFactory.newPolicy(initialPolicy);
} catch (final RuntimeException e) {
// Just log to debug, error is handled somewhere else
LOGGER.debug("Failed to parse initial policy.", e);
return initialPolicy;
}
final Policy substitutedPolicy =
substitutePolicy(existingPolicy, substitutionAlgorithm, dittoHeaders);
return substitutedPolicy.toJson();
}
}