maven-model-builder/src/main/java/org/apache/maven/model/building/ModelCacheTag.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.maven.model.building;

import org.apache.maven.api.model.DependencyManagement;
import org.apache.maven.api.model.Model;

/**
 * Describes a tag used by the model builder to access a {@link ModelCache}. This interface basically aggregates a name
 * and a class to provide some type safety when working with the otherwise untyped cache.
 *
 * @param <T> The type of data associated with the tag.
 */
interface ModelCacheTag<T> {

    /**
     * Gets the name of the tag.
     *
     * @return The name of the tag, must not be {@code null}.
     */
    String getName();

    /**
     * Gets the type of data associated with this tag.
     *
     * @return The type of data, must not be {@code null}.
     */
    Class<T> getType();

    /**
     * The tag used for the raw model without profile activation
     */
    ModelCacheTag<ModelData> RAW = new ModelCacheTag<ModelData>() {

        @Override
        public String getName() {
            return "raw";
        }

        @Override
        public Class<ModelData> getType() {
            return ModelData.class;
        }
    };

    /**
     * The tag used to denote an effective dependency management section from an imported model.
     */
    ModelCacheTag<DependencyManagement> IMPORT = new ModelCacheTag<DependencyManagement>() {

        @Override
        public String getName() {
            return "import";
        }

        @Override
        public Class<DependencyManagement> getType() {
            return DependencyManagement.class;
        }
    };

    /**
     * The tag used for the file model without profile activation
     * @since 4.0.0
     */
    ModelCacheTag<Model> FILE = new ModelCacheTag<Model>() {
        @Override
        public String getName() {
            return "file";
        }

        @Override
        public Class<Model> getType() {
            return Model.class;
        }
    };
}