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The effective model builder, with inheritance, profile activation, interpolation, ...

There is a newer version: 4.0.0-beta-5

/*
 * 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 java.net.URI;

/**
 * Provides access to the contents of a POM independently of the backing store (e.g. file system, database, memory).
 * 
 * Unlike {@link ModelSource}, this interface supports loading of parent POM(s) from the same backing store and allows
 * construction of MavenProject instances without the need to have parent POM(s) available from local or remote
 * repositories.
 * 

 * ModelSource2 instances are cached in {@link ModelBuildingRequest#getModelCache()}. Implementations must guarantee
 * that the connection to the backing store remains active until request's {@link ModelCache} is discarded or flushed.
 */
public interface ModelSource2 extends ModelSource {
    /**
     * Returns model source identified by a path relative to this model source POM. Implementation MUST
     * be able to accept relPath parameter values that
     * 

     * use either / or \ file path separator
     * have .. parent directory references
     * point either at file or directory, in the latter case POM file name 'pom.xml' needs to be used by the
     * requested model source.
     * 
     *
     * @param relPath is the path of the requested model source relative to this model source POM.
     * @return related model source or null if no such model source.
     */
    ModelSource2 getRelatedSource(String relPath);

    /**
     * Returns location of the POM, never null.
     */
    URI getLocationURI();
}