// =================== 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.ArrayList;
   import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  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;
  
  /**
   * Extensions to load.
   */
  @Experimental
  @Generated @ThreadSafe @Immutable
  public class CoreExtensions
      implements Serializable
  {
      final String namespaceUri;
      final String modelEncoding;
      /**
       * A set of build extensions to use from this project.
       */
      final List<CoreExtension> extensions;
  
      /**
        * Constructor for this class, to be called from its subclasses and {@link Builder}.
        * @see Builder#build()
        */
      protected CoreExtensions(Builder builder) {
          this.namespaceUri = builder.namespaceUri != null ? builder.namespaceUri : (builder.base != null ? builder.base.namespaceUri : null);
          this.modelEncoding = builder.modelEncoding != null ? builder.modelEncoding : (builder.base != null ? builder.base.modelEncoding :  "UTF-8");
          this.extensions = ImmutableCollections.copy(builder.extensions != null ? builder.extensions : (builder.base != null ? builder.base.extensions : null));
      }
  
      public String getNamespaceUri() {
          return namespaceUri;
      }
  
      public String getModelEncoding() {
          return modelEncoding;
      }
  
      /**
       * A set of build extensions to use from this project.
       *
       * @return a {@code List<CoreExtension>}
       */
      @Nonnull
      public List<CoreExtension> getExtensions() {
          return this.extensions;
      }
  
      /**
       * 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 CoreExtensions} instance using the specified extensions.
       *
       * @param extensions the new {@code Collection<CoreExtension>} to use
       * @return a {@code CoreExtensions} with the specified extensions
       */
      @Nonnull
      public CoreExtensions withExtensions(Collection<CoreExtension> extensions) {
          return newBuilder(this, true).extensions(extensions).build();
      }
  
      /**
       * Creates a new {@code CoreExtensions} instance.
       * Equivalent to {@code newInstance(true)}.
       * @see #newInstance(boolean)
       *
       * @return a new {@code CoreExtensions}
       */
      @Nonnull
      public static CoreExtensions newInstance() {
          return newInstance(true);
      }
 
     /**
      * Creates a new {@code CoreExtensions} 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 CoreExtensions}
      */
     @Nonnull
     public static CoreExtensions newInstance(boolean withDefaults) {
         return newBuilder(withDefaults).build();
     }
 
     /**
      * Creates a new {@code CoreExtensions} 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 CoreExtensions} 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 CoreExtensions} builder instance using the specified object as a basis.
      * Equivalent to {@code newBuilder(from, false)}.
      *
      * @param from the {@code CoreExtensions} instance to use as a basis
      * @return a new {@code Builder}
      */
     @Nonnull
     public static Builder newBuilder(CoreExtensions from) {
         return newBuilder(from, false);
     }
 
     /**
      * Creates a new {@code CoreExtensions} builder instance using the specified object as a basis.
      *
      * @param from the {@code CoreExtensions} 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(CoreExtensions from, boolean forceCopy) {
         return new Builder(from, forceCopy);
     }
 
     /**
      * Builder class used to create CoreExtensions instances.
      * @see #with()
      * @see #newBuilder()
      */
     @NotThreadSafe
     public static class Builder
     {
         CoreExtensions base;
         String namespaceUri;
         String modelEncoding;
         Collection<CoreExtension> extensions;
 
         protected Builder(boolean withDefaults) {
             if (withDefaults) {
             }
         }
 
         protected Builder(CoreExtensions base, boolean forceCopy) {
             this.namespaceUri = base.namespaceUri;
             this.modelEncoding = base.modelEncoding;
             if (forceCopy) {
                 this.extensions = base.extensions;
             } else {
                 this.base = base;
             }
         }
 
         @Nonnull
         public Builder namespaceUri(String namespaceUri) {
             this.namespaceUri = namespaceUri;
             return this;
         }
 
         @Nonnull
         public Builder modelEncoding(String modelEncoding) {
             this.modelEncoding = modelEncoding;
             return this;
         }
 
         @Nonnull
         public Builder extensions(Collection<CoreExtension> extensions) {
             this.extensions = extensions;
             return this;
         }
 
 
         @Nonnull
         public CoreExtensions build() {
             // this method should not contain any logic other than creating (or reusing) an object in order to ease subclassing
             if (base != null
                     && (extensions == null || extensions == base.extensions)
             ) {
                 return base;
             }
             return new CoreExtensions(this);
         }
 
     }
 
 }