/
SubstitutionStrategyRegistry.java
81 lines (67 loc) · 2.88 KB
/
SubstitutionStrategyRegistry.java
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/*
* Copyright (c) 2017-2018 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
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.services.concierge.enforcement.placeholders.strategies;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.model.base.headers.WithDittoHeaders;
/**
* Registry containing all of the required instances of {@link SubstitutionStrategy}.
*/
@Immutable
public final class SubstitutionStrategyRegistry {
private final List<SubstitutionStrategy> strategies;
private SubstitutionStrategyRegistry() {
strategies = Collections.unmodifiableList(new ArrayList<>(createStrategies()));
}
public static SubstitutionStrategyRegistry newInstance() {
return new SubstitutionStrategyRegistry();
}
/**
* Get a matching strategy for handling the given {@code withDittoHeaders}.
*
* @param withDittoHeaders the instance of {@link WithDittoHeaders} to be handled.
* @return an {@link Optional} containing the first strategy which matches; an empty {@link Optional} in case no
* strategy matches.
*/
public final Optional<SubstitutionStrategy> getMatchingStrategy(final WithDittoHeaders withDittoHeaders) {
for (final SubstitutionStrategy strategy : strategies) {
if (strategy.matches(withDittoHeaders)) {
return Optional.of(strategy);
}
}
return Optional.empty();
}
// for testing purposes
List<SubstitutionStrategy> getStrategies() {
return strategies;
}
private static List<SubstitutionStrategy> createStrategies() {
final List<SubstitutionStrategy> strategies = new LinkedList<>();
// replacement for policy-subject-id
strategies.add(new ModifySubjectSubstitutionStrategy());
strategies.add(new ModifySubjectsSubstitutionStrategy());
strategies.add(new ModifyPolicyEntrySubstitutionStrategy());
strategies.add(new ModifyPolicyEntriesSubstitutionStrategy());
strategies.add(new ModifyPolicySubstitutionStrategy());
strategies.add(new CreatePolicySubstitutionStrategy());
// replacement for acl-subject-id
strategies.add(new ModifyAclEntrySubstitutionStrategy());
strategies.add(new ModifyAclSubstitutionStrategy());
// replacement for both policy-subject-id and acl-subject-id
strategies.add(new ModifyThingSubstitutionStrategy());
strategies.add(new CreateThingSubstitutionStrategy());
return strategies;
}
}