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AbstractPlaceholderSubstitution.java
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AbstractPlaceholderSubstitution.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.base.service.signaltransformer.placeholdersubstitution;
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.signals.Signal;
import org.eclipse.ditto.base.service.signaltransformer.SignalTransformer;
/**
* Abstract SignalTransformer which applies substitution of placeholders on a command (subtype of {@link Signal}) based on
* its {@link DittoHeaders}.
*/
@Immutable
public abstract class AbstractPlaceholderSubstitution implements SignalTransformer {
private final HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm;
private final SubstitutionStrategyRegistry substitutionStrategyRegistry;
protected AbstractPlaceholderSubstitution(final SubstitutionStrategyRegistry substitutionStrategyRegistry) {
this.substitutionAlgorithm = HeaderBasedPlaceholderSubstitutionAlgorithm.newInstance(
createReplacementDefinitions()
);
this.substitutionStrategyRegistry = substitutionStrategyRegistry;
}
@Override
@SuppressWarnings("unchecked")
public CompletionStage<Signal<?>> apply(final Signal<?> signal) {
requireNonNull(signal);
final Optional<SubstitutionStrategy<? extends Signal<?>>> firstMatchingStrategyOpt =
substitutionStrategyRegistry.getMatchingStrategy(signal);
final Signal<?> result;
if (firstMatchingStrategyOpt.isPresent()) {
final SubstitutionStrategy<Signal<?>> firstMatchingStrategy =
(SubstitutionStrategy<Signal<?>>) firstMatchingStrategyOpt.get();
result = firstMatchingStrategy.apply(signal, substitutionAlgorithm);
} else {
result = signal;
}
return CompletableFuture.completedFuture(result);
}
/**
* Creates the replacement definitions as map of placeholder as key and function as value for determining the
* placeholder based on {@link DittoHeaders} of a processed {@link Signal}.
* May be overwritten by subclasses in order to provide additional replacement definitions.
*
* @return the default replacement definitions resolving placeholders from {@link DittoHeaders} of a processed
* {@link Signal}
*/
protected Map<String, Function<DittoHeaders, String>> createReplacementDefinitions() {
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);
}
}