/*
* Copyright 2016 Igor Maznitsa.
*
* 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.igormaznitsa.mindmap.plugins.api;
import javax.annotation.Nonnull;
/**
* Interface for plug-ins processing attributes of model topics.
*
* @since 1.2
*/
public interface AttributePlugin extends MindMapPlugin {
/**
* Attribute name which can be returned if plug-in doesn't process attributes.
*/
public static final String NULL_ATTRIBUTE = ",=,";
/**
* Get name of attribute key associated with the plug-in.
* @return the name of the attribute key.
* @see #NULL_ATTRIBUTE
*/
@Nonnull
String getAttributeKey();
}