package org.eclipse.aether.metadata;
   
   /*
    * 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.
   */
  
  import java.io.File;
  import java.util.Map;
  import static java.util.Objects.requireNonNull;
  
  /**
   * A basic metadata instance. <em>Note:</em> Instances of this class are immutable and the exposed mutators return new
   * objects rather than changing the current instance.
   */
  public final class DefaultMetadata
      extends AbstractMetadata
  {
  
      private final String groupId;
  
      private final String artifactId;
  
      private final String version;
  
      private final String type;
  
      private final Nature nature;
  
      private final File file;
  
      private final Map<String, String> properties;
  
      /**
       * Creates a new metadata for the repository root with the specific type and nature.
       * 
       * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
       * @param nature The nature of the metadata, must not be {@code null}.
       */
      public DefaultMetadata( String type, Nature nature )
      {
          this( "", "", "", type, nature, null, (File) null );
      }
  
      /**
       * Creates a new metadata for the groupId level with the specific type and nature.
       * 
       * @param groupId The group identifier to which this metadata applies, may be {@code null}.
       * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
       * @param nature The nature of the metadata, must not be {@code null}.
       */
      public DefaultMetadata( String groupId, String type, Nature nature )
      {
          this( groupId, "", "", type, nature, null, (File) null );
      }
  
      /**
       * Creates a new metadata for the groupId:artifactId level with the specific type and nature.
       * 
       * @param groupId The group identifier to which this metadata applies, may be {@code null}.
       * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
       * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
       * @param nature The nature of the metadata, must not be {@code null}.
       */
      public DefaultMetadata( String groupId, String artifactId, String type, Nature nature )
      {
          this( groupId, artifactId, "", type, nature, null, (File) null );
      }
  
      /**
       * Creates a new metadata for the groupId:artifactId:version level with the specific type and nature.
       * 
       * @param groupId The group identifier to which this metadata applies, may be {@code null}.
       * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
       * @param version The version to which this metadata applies, may be {@code null}.
       * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
       * @param nature The nature of the metadata, must not be {@code null}.
       */
      public DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature )
      {
          this( groupId, artifactId, version, type, nature, null, (File) null );
      }
  
      /**
       * Creates a new metadata for the groupId:artifactId:version level with the specific type and nature.
      * 
      * @param groupId The group identifier to which this metadata applies, may be {@code null}.
      * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
      * @param version The version to which this metadata applies, may be {@code null}.
      * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
      * @param nature The nature of the metadata, must not be {@code null}.
      * @param file The resolved file of the metadata, may be {@code null}.
      */
     public DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature, File file )
     {
         this( groupId, artifactId, version, type, nature, null, file );
     }
 
     /**
      * Creates a new metadata for the groupId:artifactId:version level with the specific type and nature.
      * 
      * @param groupId The group identifier to which this metadata applies, may be {@code null}.
      * @param artifactId The artifact identifier to which this metadata applies, may be {@code null}.
      * @param version The version to which this metadata applies, may be {@code null}.
      * @param type The type of the metadata, e.g. "maven-metadata.xml", may be {@code null}.
      * @param nature The nature of the metadata, must not be {@code null}.
      * @param properties The properties of the metadata, may be {@code null} if none.
      * @param file The resolved file of the metadata, may be {@code null}.
      */
     public DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature,
                             Map<String, String> properties, File file )
     {
         this.groupId = emptify( groupId );
         this.artifactId = emptify( artifactId );
         this.version = emptify( version );
         this.type = emptify( type );
         this.nature = requireNonNull( nature, "metadata nature cannot be null" );
         this.file = file;
         this.properties = copyProperties( properties );
     }
 
     DefaultMetadata( String groupId, String artifactId, String version, String type, Nature nature, File file,
                      Map<String, String> properties )
     {
         // NOTE: This constructor assumes immutability of the provided properties, for internal use only
         this.groupId = emptify( groupId );
         this.artifactId = emptify( artifactId );
         this.version = emptify( version );
         this.type = emptify( type );
         this.nature = nature;
         this.file = file;
         this.properties = properties;
     }
 
     private static String emptify( String str )
     {
         return ( str == null ) ? "" : str;
     }
 
     public String getGroupId()
     {
         return groupId;
     }
 
     public String getArtifactId()
     {
         return artifactId;
     }
 
     public String getVersion()
     {
         return version;
     }
 
     public String getType()
     {
         return type;
     }
 
     public Nature getNature()
     {
         return nature;
     }
 
     public File getFile()
     {
         return file;
     }
 
     public Map<String, String> getProperties()
     {
         return properties;
     }
 
 }