/*
 * Copyright 2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.api.internal.artifacts.transform;

import org.gradle.api.Action;
import org.gradle.api.Describable;
import org.gradle.execution.ProjectExecutionServiceRegistry;

import javax.annotation.Nullable;

/**
 * The internal API equivalent of {@link org.gradle.api.artifacts.transform.TransformAction}, which is also aware of our cache infrastructure.
 *
 * This can encapsulate a single transformation step using a single transformer or a chain of transformation steps.
 */
public interface Transformation extends Describable {

    boolean endsWith(Transformation otherTransform);

    int stepsCount();

    /**
     * Creates an invocation for invoking the transformation.
     *
     * Creating the invocation is not for free, since the workspace identity needs to be determined.
     * This requires snapshotting the input artifact and its dependencies.
     */
    CacheableInvocation<TransformationSubject> createInvocation(TransformationSubject subjectToTransform, ExecutionGraphDependenciesResolver dependenciesResolver, @Nullable ProjectExecutionServiceRegistry services);

    /**
     * Whether the transformation requires dependencies of the transformed artifact to be injected.
     */
    boolean requiresDependencies();

    /**
     * Extract the transformation steps from this transformation.
     */
    void visitTransformationSteps(Action<? super TransformationStep> action);
}
