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APIs to customize Android Gradle Builds

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/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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 com.android.build.api.transform;

import com.android.annotations.NonNull;
import com.android.annotations.Nullable;

import java.util.Collection;

/**
 * An invocation object used to pass of pertinent information for a
 * {@link Transform#transform(TransformInvocation)} call.
 */
public interface TransformInvocation {

    /**
     * Returns the context in which the transform is run.
     * @return the context in which the transform is run.
     */
    @NonNull
    Context getContext();

    /**
     * Returns the inputs/outputs of the transform.
     * @return the inputs/outputs of the transform.
     */
    @NonNull
    Collection getInputs();

    /**
     * Returns the referenced-only inputs which are not consumed by this transformation.
     * @return the referenced-only inputs.
     */
    @NonNull Collection getReferencedInputs();
    /**
     * Returns the list of secondary file changes since last. Only secondary files that this
     * transform can handle incrementally will be part of this change set.
     * @return the list of changes impacting a {@link SecondaryInput}
     */
    @NonNull Collection getSecondaryInputs();

    /**
     * Returns the output provider allowing to create content.
     * @return he output provider allowing to create content.
     */
    @Nullable
    TransformOutputProvider getOutputProvider();


    /**
     * Indicates whether the transform execution is incremental.
     * @return true for an incremental invocation, false otherwise.
     */
    boolean isIncremental();
}