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    • org.gradle.api.internal.tasks.properties.PropertyValue Maven / Gradle / Ivy

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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 org.gradle.api.Task;
import org.gradle.api.provider.Provider;

import javax.annotation.Nullable;
import java.util.concurrent.Callable;

public interface PropertyValue extends Callable {
    /**
     * The value of the underlying property, replacing an empty provider by {@literal null}.
     *
     * This is required for allowing optional provider properties - all code which unpacks providers calls {@link Provider#get()} and would fail if an optional provider is passed.
     * Returning {@literal null} from a {@link Callable} is ignored, and {@link PropertyValue} is a {@link Callable}.
     */
    @Nullable
    @Override
    Object call();

    /**
     * The unprocessed value of the underlying property.
     */
    @Nullable
    Object getUnprocessedValue();

    void attachProducer(Task producer);

    void maybeFinalizeValue();
}
    
    
    
    

    




    
    
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