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/*
 * 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.tasks.properties;

import com.google.common.collect.ImmutableSortedSet;
import org.gradle.api.NonNullApi;
import org.gradle.api.file.FileCollection;
import org.gradle.api.internal.TaskInternal;
import org.gradle.api.internal.file.FileCollectionFactory;
import org.gradle.internal.properties.bean.PropertyWalker;
import org.gradle.internal.reflect.validation.TypeValidationContext;

/**
 * A view of the properties of a task.
 *
 * This includes inputs, outputs, destroyables and local state properties.
 *
 * Once created, the view is immutable and registering additional or changing existing task properties will not be detected.
 *
 * Created by {@link DefaultTaskProperties#resolve(PropertyWalker, FileCollectionFactory, TaskInternal)}.
 */
@NonNullApi
public interface TaskProperties {
    /**
     * The lifecycle aware values.
     */
    Iterable getLifecycleAwareValues();

    /**
     * Input properties.
     */
    ImmutableSortedSet getInputProperties();

    /**
     * Input file properties.
     *
     * It is guaranteed that all the {@link InputFilePropertySpec}s have a name and that the names are unique.
     */
    ImmutableSortedSet getInputFileProperties();

    /**
     * Output file properties.
     *
     * It is guaranteed that all the {@link OutputFilePropertySpec}s have a name and that the names are unique.
     */
    ImmutableSortedSet getOutputFileProperties();

    /**
     * Service reference properties (those annotated with {@link org.gradle.api.services.ServiceReference}).
     *
     * It is guaranteed that all the {@link ServiceReferenceSpec}s have a name and that the names are unique.
     *
     * @see org.gradle.api.services.ServiceReference
     */
    ImmutableSortedSet getServiceReferences();

    /**
     * Whether output properties have been declared.
     */
    boolean hasDeclaredOutputs();

    /**
     * The files that represent the local state.
     */
    FileCollection getLocalStateFiles();

    /**
     * The files that are destroyed.
     */
    FileCollection getDestroyableFiles();

    /**
     * Validate the task type.
     */
    void validateType(TypeValidationContext validationContext);

    /**
     * Validations for the properties.
     */
    void validate(PropertyValidationContext validationContext);
}