/*
 * 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.classrealm;

import java.util.List;
import java.util.Map;

/**
 * Describes the requirements for a new class realm.
 *
 * @author Benjamin Bentmann
 */
public interface ClassRealmRequest {

    /**
     * The type of a class realm.
     */
    enum RealmType {
        /**
         * The class realm for the public API of the Maven core.
         */
        Core,

        /**
         * A class realm for a project to aggregates its build extensions.
         */
        Project,

        /**
         * A class realm for a build extension.
         */
        Extension,

        /**
         * A class realm for a plugin.
         */
        Plugin,
    }

    /**
     * Gets the type of the class realm.
     *
     * @return The type of the class realm, never {@code null}.
     */
    RealmType getType();

    /**
     * Gets the parent class realm (if any).
     *
     * @return The parent class realm or {@code null} if using the default parent.
     */
    ClassLoader getParent();

    /**
     * @deprecated Use {@link #getParentImports()} instead.
     */
    @Deprecated
    List<String> getImports();

    /**
     * Gets the packages/types to import from the parent realm.
     *
     * @return The modifiable list of packages/types to import from the parent realm, never {@code null}.
     */
    List<String> getParentImports();

    /**
     * Gets the packages/types to import from foreign realms.
     *
     * @return The modifiable map of packages/types to import from foreign realms, never {@code null}.
     */
    Map<String, ClassLoader> getForeignImports();

    /**
     * Gets the constituents for the class realm.
     *
     * @return The modifiable list of constituents for the class realm, never {@code null}.
     */
    List<ClassRealmConstituent> getConstituents();
}
