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SubstitutionStrategyRegistry.java
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SubstitutionStrategyRegistry.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 java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.headers.DittoHeadersSettable;
import org.eclipse.ditto.base.model.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 = List.copyOf(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.
*/
@SuppressWarnings({"rawtypes", "java:S3740"})
public Optional<SubstitutionStrategy> getMatchingStrategy(final DittoHeadersSettable<?> 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());
return strategies;
}
}