gradle-master/subprojects/core/src/main/java/org/gradle/api/internal/attributes/ImmutableAttributes.java
/*
 * 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 com.google.common.collect.ImmutableSet;
import org.gradle.api.attributes.Attribute;

public interface ImmutableAttributes extends AttributeContainerInternal {
    ImmutableAttributes EMPTY = new DefaultImmutableAttributes();

    /**
     * Locates the entry for the given attribute. Returns a 'missing' value when not present.
     */
    <T> AttributeValue<T> findEntry(Attribute<T> key);

    /**
     * Locates the entry for the attribute with the given name. Returns a 'missing' value when not present.
     */
    AttributeValue<?> findEntry(String key);

    @Override
    ImmutableSet<Attribute<?>> keySet();
}
