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/*
* Copyright 2016 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.attributes;
import org.gradle.api.InvalidUserCodeException;
import org.gradle.internal.Cast;
import java.util.NoSuchElementException;
/**
* Represents an optional attribute value, as found in an attribute container. There are 3 possible cases:
*
* - present is the default, and represents an attribute with an actual value
* - missing used whenever an attribute is known of the {@link org.gradle.api.attributes.AttributesSchema} of a consumer,
* no value was provided.
* - unknown used whenever an attribute is unknown of the {@link org.gradle.api.attributes.AttributesSchema} of a consumer,
* implying that no value was provided. It is different from the missing case in the sense that the consumer
* had no chance to provide a value here.
*
* During attribute matching, this can be used to implement various {@link org.gradle.api.attributes.AttributeMatchingStrategy strategies}.
* @param the type of the attribute
*
* @since 3.3
*/
public class AttributeValue {
private final static AttributeValue
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