/*
 * Copyright 2018 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 com.google.common.collect.ImmutableList;
import org.gradle.api.Describable;
import org.gradle.api.file.FileSystemLocation;
import org.gradle.api.internal.attributes.ImmutableAttributes;
import org.gradle.api.internal.tasks.TaskDependencyContainer;
import org.gradle.api.provider.Provider;
import org.gradle.api.tasks.FileNormalizer;
import org.gradle.internal.fingerprint.FileCollectionFingerprinterRegistry;
import org.gradle.internal.hash.HashCode;
import org.gradle.work.InputChanges;

import javax.annotation.Nullable;
import java.io.File;

/**
 * The actual code which needs to be executed to transform a file.
 *
 * This encapsulates the public interface {@link org.gradle.api.artifacts.transform.TransformAction} into an internal type.
 */
public interface Transformer extends Describable, TaskDependencyContainer {
    Class<?> getImplementationClass();

    ImmutableAttributes getFromAttributes();

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

    /**
     * Whether the transformer requires {@link InputChanges} to be injected.
     */
    boolean requiresInputChanges();

    /**
     * Whether the transformer is cacheable.
     */
    boolean isCacheable();

    ImmutableList<File> transform(Provider<FileSystemLocation> inputArtifactProvider, File outputDir, ArtifactTransformDependencies dependencies, @Nullable InputChanges inputChanges);

    /**
     * The hash of the secondary inputs of the transformer.
     *
     * This includes the parameters and the implementation.
     */
    HashCode getSecondaryInputHash();

    void isolateParameters(FileCollectionFingerprinterRegistry fingerprinterRegistry);

    Class<? extends FileNormalizer> getInputArtifactNormalizer();

    Class<? extends FileNormalizer> getInputArtifactDependenciesNormalizer();

    boolean isIsolated();
}
