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ModifyPolicyEntriesSubstitutionStrategy.java
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ModifyPolicyEntriesSubstitutionStrategy.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.enforcement.placeholders.strategies;
import static java.util.Objects.requireNonNull;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.policies.enforcement.placeholders.HeaderBasedPlaceholderSubstitutionAlgorithm;
import org.eclipse.ditto.policies.model.PolicyEntry;
import org.eclipse.ditto.policies.model.signals.commands.modify.ModifyPolicyEntries;
/**
* Handles substitution for {@link org.eclipse.ditto.policies.model.SubjectId}
* inside a {@link ModifyPolicyEntries} command.
*/
final class ModifyPolicyEntriesSubstitutionStrategy extends AbstractTypedSubstitutionStrategy<ModifyPolicyEntries> {
ModifyPolicyEntriesSubstitutionStrategy() {
super(ModifyPolicyEntries.class);
}
@Override
public ModifyPolicyEntries apply(final ModifyPolicyEntries modifyPolicyEntries,
final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm) {
requireNonNull(modifyPolicyEntries);
requireNonNull(substitutionAlgorithm);
final DittoHeaders dittoHeaders = modifyPolicyEntries.getDittoHeaders();
final Iterable<PolicyEntry> existingPolicyEntries = modifyPolicyEntries.getPolicyEntries();
final Iterable<PolicyEntry> substitutedEntries =
substitutePolicyEntries(existingPolicyEntries, substitutionAlgorithm, dittoHeaders);
if (existingPolicyEntries.equals(substitutedEntries)) {
return modifyPolicyEntries;
} else {
return ModifyPolicyEntries.of(modifyPolicyEntries.getEntityId(), substitutedEntries,
dittoHeaders);
}
}
}