/**
* Copyright 2011-2017 Asakusa Framework Team.
*
* 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.asakusafw.vocabulary.flow.graph;
import java.util.Set;
/**
* Provides {@link FlowElementAttribute}s.
* @since 0.4.0
* @version 0.9.1
*/
public interface FlowElementAttributeProvider {
/**
* Returns the all available attribute types of this.
* @return the available attribute types
* @since 0.9.1
*/
Set<? extends Class<? extends FlowElementAttribute>> getAttributeTypes();
/**
* Returns the attribute of this.
* @param <T> target class
* @param attributeClass target class
* @return attribute, or {@code null} if not defined
* @throws IllegalArgumentException if some parameters were {@code null}
*/
<T extends FlowElementAttribute> T getAttribute(Class<T> attributeClass);
}