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SubstitutionStrategy.java
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SubstitutionStrategy.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.edge.service.dispatching.signaltransformer.placeholdersubstitution;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.edge.service.dispatching.signaltransformer.placeholdersubstitution.HeaderBasedPlaceholderSubstitutionAlgorithm;
/**
* Defines the (placeholder) substitution strategy for a certain command (which is of type {@link Signal}.
*
* @param <T> the subtype of {@link Signal} handled by this strategy.
*/
public interface SubstitutionStrategy<T extends Signal<?>> {
/**
* Checks whether this strategy is applicable for the given {@code signal}.
*
* @param signal the command which may have content to be substituted.
* @return {@code true}, if this strategy is applicable; {@code false}, otherwise.
*/
boolean matches(Signal<?> signal);
/**
* Apply (placeholder) substitution on the given {@code signal} using the {@code substitutionAlgorithm}.
*
* @param signal the command which may have content to be substituted.
* @param substitutionAlgorithm the algorithm to be used for placeholder substitution.
* @return a copy of {@code signal} with substitutions applied, if substitutions were necessary; the
* same {@code signal}, if no substitutions were necessary.
*/
T apply(T signal, HeaderBasedPlaceholderSubstitutionAlgorithm substitutionAlgorithm);
}