// =================== DO NOT EDIT THIS FILE ====================
   //  Generated by Modello Velocity from model.vm
   //  template, any modifications will be overwritten.
   // ==============================================================
   package org.apache.maven.api.cli.extensions;
   
   import java.io.Serializable;
   import java.util.Collections;
   import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Optional;
  import java.util.Set;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  import org.apache.maven.api.annotations.Experimental;
  import org.apache.maven.api.annotations.Generated;
  import org.apache.maven.api.annotations.Immutable;
  import org.apache.maven.api.annotations.Nonnull;
  import org.apache.maven.api.annotations.NotThreadSafe;
  import org.apache.maven.api.annotations.ThreadSafe;
  import org.apache.maven.api.xml.XmlNode;
  
  /**
   * Describes a build extension to utilise.
   */
  @Experimental
  @Generated @ThreadSafe @Immutable
  public class CoreExtension
      implements Serializable
  {
      /**
       * The group ID of the extension's artifact.
       */
      final String groupId;
      /**
       * The artifact ID of the extension.
       */
      final String artifactId;
      /**
       * The version of the extension.
       */
      final String version;
      /**
       * The class loading strategy: 'self-first' (the default), 'parent-first' (loads classes from the parent, then from the extension) or 'plugin' (follows the rules from extensions defined as plugins).
       */
      final String classLoadingStrategy;
      /**
       */
      final XmlNode configuration;
  
      /**
        * Constructor for this class, to be called from its subclasses and {@link Builder}.
        * @see Builder#build()
        */
      protected CoreExtension(Builder builder) {
          this.groupId = builder.groupId != null ? builder.groupId : (builder.base != null ? builder.base.groupId : null);
          this.artifactId = builder.artifactId != null ? builder.artifactId : (builder.base != null ? builder.base.artifactId : null);
          this.version = builder.version != null ? builder.version : (builder.base != null ? builder.base.version : null);
          this.classLoadingStrategy = builder.classLoadingStrategy != null ? builder.classLoadingStrategy : (builder.base != null ? builder.base.classLoadingStrategy : null);
          this.configuration = builder.configuration != null ? builder.configuration : (builder.base != null ? builder.base.configuration : null);
      }
  
      /**
       * The group ID of the extension's artifact.
       *
       * @return a {@code String}
       */
      public String getGroupId() {
          return this.groupId;
      }
  
      /**
       * The artifact ID of the extension.
       *
       * @return a {@code String}
       */
      public String getArtifactId() {
          return this.artifactId;
      }
  
      /**
       * The version of the extension.
       *
       * @return a {@code String}
       */
      public String getVersion() {
          return this.version;
      }
  
      /**
       * The class loading strategy: 'self-first' (the default), 'parent-first' (loads classes from the parent, then from the extension) or 'plugin' (follows the rules from extensions defined as plugins).
       *
       * @return a {@code String}
       */
      public String getClassLoadingStrategy() {
          return this.classLoadingStrategy;
      }
  
     /**
      *
      * @return a {@code XmlNode}
      */
     public XmlNode getConfiguration() {
         return this.configuration;
     }
 
     /**
      * Creates a new builder with this object as the basis.
      *
      * @return a {@code Builder}
      */
     @Nonnull
     public Builder with() {
         return newBuilder(this);
     }
     /**
      * Creates a new {@code CoreExtension} instance using the specified groupId.
      *
      * @param groupId the new {@code String} to use
      * @return a {@code CoreExtension} with the specified groupId
      */
     @Nonnull
     public CoreExtension withGroupId(String groupId) {
         return newBuilder(this, true).groupId(groupId).build();
     }
     /**
      * Creates a new {@code CoreExtension} instance using the specified artifactId.
      *
      * @param artifactId the new {@code String} to use
      * @return a {@code CoreExtension} with the specified artifactId
      */
     @Nonnull
     public CoreExtension withArtifactId(String artifactId) {
         return newBuilder(this, true).artifactId(artifactId).build();
     }
     /**
      * Creates a new {@code CoreExtension} instance using the specified version.
      *
      * @param version the new {@code String} to use
      * @return a {@code CoreExtension} with the specified version
      */
     @Nonnull
     public CoreExtension withVersion(String version) {
         return newBuilder(this, true).version(version).build();
     }
     /**
      * Creates a new {@code CoreExtension} instance using the specified classLoadingStrategy.
      *
      * @param classLoadingStrategy the new {@code String} to use
      * @return a {@code CoreExtension} with the specified classLoadingStrategy
      */
     @Nonnull
     public CoreExtension withClassLoadingStrategy(String classLoadingStrategy) {
         return newBuilder(this, true).classLoadingStrategy(classLoadingStrategy).build();
     }
     /**
      * Creates a new {@code CoreExtension} instance using the specified configuration.
      *
      * @param configuration the new {@code XmlNode} to use
      * @return a {@code CoreExtension} with the specified configuration
      */
     @Nonnull
     public CoreExtension withConfiguration(XmlNode configuration) {
         return newBuilder(this, true).configuration(configuration).build();
     }
 
     /**
      * Creates a new {@code CoreExtension} instance.
      * Equivalent to {@code newInstance(true)}.
      * @see #newInstance(boolean)
      *
      * @return a new {@code CoreExtension}
      */
     @Nonnull
     public static CoreExtension newInstance() {
         return newInstance(true);
     }
 
     /**
      * Creates a new {@code CoreExtension} instance using default values or not.
      * Equivalent to {@code newBuilder(withDefaults).build()}.
      *
      * @param withDefaults the boolean indicating whether default values should be used
      * @return a new {@code CoreExtension}
      */
     @Nonnull
     public static CoreExtension newInstance(boolean withDefaults) {
         return newBuilder(withDefaults).build();
     }
 
     /**
      * Creates a new {@code CoreExtension} builder instance.
      * Equivalent to {@code newBuilder(true)}.
      * @see #newBuilder(boolean)
      *
      * @return a new {@code Builder}
      */
     @Nonnull
     public static Builder newBuilder() {
         return newBuilder(true);
     }
 
     /**
      * Creates a new {@code CoreExtension} builder instance using default values or not.
      *
      * @param withDefaults the boolean indicating whether default values should be used
      * @return a new {@code Builder}
      */
     @Nonnull
     public static Builder newBuilder(boolean withDefaults) {
         return new Builder(withDefaults);
     }
 
     /**
      * Creates a new {@code CoreExtension} builder instance using the specified object as a basis.
      * Equivalent to {@code newBuilder(from, false)}.
      *
      * @param from the {@code CoreExtension} instance to use as a basis
      * @return a new {@code Builder}
      */
     @Nonnull
     public static Builder newBuilder(CoreExtension from) {
         return newBuilder(from, false);
     }
 
     /**
      * Creates a new {@code CoreExtension} builder instance using the specified object as a basis.
      *
      * @param from the {@code CoreExtension} instance to use as a basis
      * @param forceCopy the boolean indicating if a copy should be forced
      * @return a new {@code Builder}
      */
     @Nonnull
     public static Builder newBuilder(CoreExtension from, boolean forceCopy) {
         return new Builder(from, forceCopy);
     }
 
     /**
      * Builder class used to create CoreExtension instances.
      * @see #with()
      * @see #newBuilder()
      */
     @NotThreadSafe
     public static class Builder
     {
         CoreExtension base;
         String groupId;
         String artifactId;
         String version;
         String classLoadingStrategy;
         XmlNode configuration;
 
         protected Builder(boolean withDefaults) {
             if (withDefaults) {
                 this.classLoadingStrategy = "self-first";
             }
         }
 
         protected Builder(CoreExtension base, boolean forceCopy) {
             if (forceCopy) {
                 this.groupId = base.groupId;
                 this.artifactId = base.artifactId;
                 this.version = base.version;
                 this.classLoadingStrategy = base.classLoadingStrategy;
                 this.configuration = base.configuration;
             } else {
                 this.base = base;
             }
         }
 
         @Nonnull
         public Builder groupId(String groupId) {
             this.groupId = groupId;
             return this;
         }
 
         @Nonnull
         public Builder artifactId(String artifactId) {
             this.artifactId = artifactId;
             return this;
         }
 
         @Nonnull
         public Builder version(String version) {
             this.version = version;
             return this;
         }
 
         @Nonnull
         public Builder classLoadingStrategy(String classLoadingStrategy) {
             this.classLoadingStrategy = classLoadingStrategy;
             return this;
         }
 
         @Nonnull
         public Builder configuration(XmlNode configuration) {
             this.configuration = configuration;
             return this;
         }
 
 
         @Nonnull
         public CoreExtension build() {
             // this method should not contain any logic other than creating (or reusing) an object in order to ease subclassing
             if (base != null
                     && (groupId == null || groupId == base.groupId)
                     && (artifactId == null || artifactId == base.artifactId)
                     && (version == null || version == base.version)
                     && (classLoadingStrategy == null || classLoadingStrategy == base.classLoadingStrategy)
                     && (configuration == null || configuration == base.configuration)
             ) {
                 return base;
             }
             return new CoreExtension(this);
         }
 
     }
 
 
             
     /**
      * Gets the identifier of the extension.
      *
      * @return The extension id in the form {@code <groupId>:<artifactId>:<version>}, never {@code null}.
      */
     public String getId() {
         return (getGroupId() == null ? "[unknown-group-id]" : getGroupId())
             + ":" + (getArtifactId() == null ? "[unknown-artifact-id]" : getArtifactId())
             + ":" + (getVersion() == null ? "[unknown-version]" : getVersion());
     }
             
           
 }