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ModifySubjectSubstitutionStrategy.java
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ModifySubjectSubstitutionStrategy.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 org.eclipse.ditto.model.base.headers.WithDittoHeaders;
import org.eclipse.ditto.model.policies.Subject;
import org.eclipse.ditto.services.concierge.enforcement.placeholders.HeaderBasedPlaceholderSubstitutionAlgorithm;
import org.eclipse.ditto.signals.commands.policies.modify.ModifySubject;
/**
* Handles substitution for {@link org.eclipse.ditto.model.policies.SubjectId} inside a {@link ModifySubject} command.
*/
final class ModifySubjectSubstitutionStrategy extends AbstractTypedSubstitutionStrategy<ModifySubject> {
ModifySubjectSubstitutionStrategy() {
super(ModifySubject.class);
}
@Override
public WithDittoHeaders apply(final ModifySubject modifySubject,
final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm) {
requireNonNull(modifySubject);
requireNonNull(substitutionAlgorithm);
final String subjectId = modifySubject.getSubject().getId().toString();
final String substitutedSubjectId = substitutionAlgorithm.substitute(subjectId, modifySubject);
if (subjectId.equals(substitutedSubjectId)) {
return modifySubject;
} else {
final Subject newSubject =
Subject.newInstance(substitutedSubjectId, modifySubject.getSubject().getType());
return ModifySubject.of(modifySubject.getId(), modifySubject.getLabel(), newSubject,
modifySubject.getDittoHeaders());
}
}
}