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PlaceholderSubstitution.java
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PlaceholderSubstitution.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;
import static java.util.Objects.requireNonNull;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
import java.util.function.Function;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.base.model.headers.DittoHeadersSettable;
import org.eclipse.ditto.policies.enforcement.placeholders.strategies.SubstitutionStrategy;
import org.eclipse.ditto.policies.enforcement.placeholders.strategies.SubstitutionStrategyRegistry;
/**
* A function which applies substitution of placeholders on a command (subtype of {@link DittoHeadersSettable}) based on
* its {@link DittoHeaders}.
*/
@Immutable
public final class PlaceholderSubstitution
implements Function<DittoHeadersSettable<?>, CompletionStage<DittoHeadersSettable<?>>> {
private final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm;
private final SubstitutionStrategyRegistry substitutionStrategyRegistry;
private PlaceholderSubstitution(final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm,
final SubstitutionStrategyRegistry substitutionStrategyRegistry) {
this.substitutionAlgorithm = substitutionAlgorithm;
this.substitutionStrategyRegistry = substitutionStrategyRegistry;
}
/**
* Creates a new instance with default replacement definitions.
*
* @return the created instance.
* @see #newExtendedInstance(java.util.Map)
*/
public static PlaceholderSubstitution newInstance() {
final Map<String, Function<DittoHeaders, String>> defaultReplacementDefinitions =
createDefaultReplacementDefinitions();
return createInstance(defaultReplacementDefinitions);
}
/**
* Creates a new instance with default replacement definitions, extended with
* {@code additionalReplacementDefinitions}.
*
* @param additionalReplacementDefinitions the additional replacement definitions.
* @return the created instance.
* @see #newInstance()
*/
public static PlaceholderSubstitution newExtendedInstance(
final Map<String, Function<DittoHeaders, String>> additionalReplacementDefinitions) {
requireNonNull(additionalReplacementDefinitions);
final Map<String, Function<DittoHeaders, String>> defaultReplacementDefinitions =
createDefaultReplacementDefinitions();
final Map<String, Function<DittoHeaders, String>> allReplacementDefinitions =
new LinkedHashMap<>();
allReplacementDefinitions.putAll(defaultReplacementDefinitions);
allReplacementDefinitions.putAll(additionalReplacementDefinitions);
return createInstance(allReplacementDefinitions);
}
@Override
@SuppressWarnings({"unchecked", "rawtypes", "java:S3740"})
public CompletionStage<DittoHeadersSettable<?>> apply(final DittoHeadersSettable<?> dittoHeadersSettable) {
requireNonNull(dittoHeadersSettable);
final Optional<SubstitutionStrategy> firstMatchingStrategyOpt =
substitutionStrategyRegistry.getMatchingStrategy(dittoHeadersSettable);
if (firstMatchingStrategyOpt.isPresent()) {
final SubstitutionStrategy firstMatchingStrategy = firstMatchingStrategyOpt.get();
return CompletableFuture.supplyAsync(() ->
firstMatchingStrategy.apply(dittoHeadersSettable, substitutionAlgorithm)
);
} else {
return CompletableFuture.completedFuture(dittoHeadersSettable);
}
}
private static Map<String, Function<DittoHeaders, String>> createDefaultReplacementDefinitions() {
final Map<String, Function<DittoHeaders, String>> defaultReplacementDefinitions = new LinkedHashMap<>();
defaultReplacementDefinitions.put(SubjectIdReplacementDefinition.REPLACER_NAME,
SubjectIdReplacementDefinition.getInstance());
defaultReplacementDefinitions.put(SubjectIdReplacementDefinition.LEGACY_REPLACER_NAME,
SubjectIdReplacementDefinition.getInstance());
return Collections.unmodifiableMap(defaultReplacementDefinitions);
}
private static PlaceholderSubstitution createInstance(
final Map<String, Function<DittoHeaders, String>> replacementDefinitions) {
final HeaderBasedPlaceholderSubstitutionAlgorithm algorithm =
HeaderBasedPlaceholderSubstitutionAlgorithm.newInstance(replacementDefinitions);
final SubstitutionStrategyRegistry substitutionStrategyRegistry =
SubstitutionStrategyRegistry.newInstance();
return new PlaceholderSubstitution(algorithm, substitutionStrategyRegistry);
}
}