/*
    * 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.locator;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.File;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  
  /**
   * Locates a POM file within a project base directory.
   *
   */
  @Named
  @Singleton
  public class DefaultModelLocator implements ModelLocator {
  
      @Deprecated
      @Override
      public File locatePom(File projectDirectory) {
          Path path = locatePom(projectDirectory != null ? projectDirectory.toPath() : null);
          return path != null ? path.toFile() : null;
      }
  
      @Override
      public Path locatePom(Path projectDirectory) {
          return projectDirectory != null ? projectDirectory : Paths.get(System.getProperty("user.dir"));
      }
  
      @Deprecated
      @Override
      public File locateExistingPom(File project) {
          Path path = locateExistingPom(project != null ? project.toPath() : null);
          return path != null ? path.toFile() : null;
      }
  
      @Override
      public Path locateExistingPom(Path project) {
          if (project == null || Files.isDirectory(project)) {
              project = locatePom(project);
          }
          if (Files.isDirectory(project)) {
              Path pom = project.resolve("pom.xml");
              return Files.isRegularFile(pom) ? pom : null;
          } else if (Files.isRegularFile(project)) {
              return project;
          } else {
              return null;
          }
      }
  }