// =================== DO NOT EDIT THIS FILE ====================
   //  Generated by Modello Velocity from model.vm
   //  template, any modifications will be overwritten.
   // ==============================================================
   package org.apache.maven.api.model;
   
   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 Extension
      implements Serializable, InputLocationTracker
  {
      /**
       * 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 configuration of the extension.
       * @since Maven 4.0.0
       */
      final XmlNode configuration;
      /** Locations */
      final Map<Object, InputLocation> locations;
      /** Location tracking */
      final InputLocation importedFrom;
  
      /**
        * Constructor for this class, to be called from its subclasses and {@link Builder}.
        * @see Builder#build()
        */
      protected Extension(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.configuration = builder.configuration != null ? builder.configuration : (builder.base != null ? builder.base.configuration : null);
          this.locations = builder.computeLocations();
          this.importedFrom = builder.importedFrom;
      }
  
      /**
       * 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 configuration of the extension.
       * @since Maven 4.0.0
       *
       * @return a {@code XmlNode}
       */
     public XmlNode getConfiguration() {
         return this.configuration;
     }
 
     /**
      * Gets the location of the specified field in the input source.
      */
     public InputLocation getLocation(Object key) {
         return locations.get(key);
     }
 
     /**
      * Gets the keys of the locations of the input source.
      */
     public Set<Object> getLocationKeys() {
         return locations.keySet();
     }
 
     protected Stream<Object> getLocationKeyStream() {
         return locations.keySet().stream();
     }
 
     /**
      * Gets the input location that caused this model to be read.
      */
     public InputLocation getImportedFrom()
     {
         return importedFrom;
     }
 
     /**
      * 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 Extension} instance using the specified groupId.
      *
      * @param groupId the new {@code String} to use
      * @return a {@code Extension} with the specified groupId
      */
     @Nonnull
     public Extension withGroupId(String groupId) {
         return newBuilder(this, true).groupId(groupId).build();
     }
     /**
      * Creates a new {@code Extension} instance using the specified artifactId.
      *
      * @param artifactId the new {@code String} to use
      * @return a {@code Extension} with the specified artifactId
      */
     @Nonnull
     public Extension withArtifactId(String artifactId) {
         return newBuilder(this, true).artifactId(artifactId).build();
     }
     /**
      * Creates a new {@code Extension} instance using the specified version.
      *
      * @param version the new {@code String} to use
      * @return a {@code Extension} with the specified version
      */
     @Nonnull
     public Extension withVersion(String version) {
         return newBuilder(this, true).version(version).build();
     }
     /**
      * Creates a new {@code Extension} instance using the specified configuration.
      *
      * @param configuration the new {@code XmlNode} to use
      * @return a {@code Extension} with the specified configuration
      */
     @Nonnull
     public Extension withConfiguration(XmlNode configuration) {
         return newBuilder(this, true).configuration(configuration).build();
     }
 
     /**
      * Creates a new {@code Extension} instance.
      * Equivalent to {@code newInstance(true)}.
      * @see #newInstance(boolean)
      *
      * @return a new {@code Extension}
      */
     @Nonnull
     public static Extension newInstance() {
         return newInstance(true);
     }
 
     /**
      * Creates a new {@code Extension} 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 Extension}
      */
     @Nonnull
     public static Extension newInstance(boolean withDefaults) {
         return newBuilder(withDefaults).build();
     }
 
     /**
      * Creates a new {@code Extension} 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 Extension} 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 Extension} builder instance using the specified object as a basis.
      * Equivalent to {@code newBuilder(from, false)}.
      *
      * @param from the {@code Extension} instance to use as a basis
      * @return a new {@code Builder}
      */
     @Nonnull
     public static Builder newBuilder(Extension from) {
         return newBuilder(from, false);
     }
 
     /**
      * Creates a new {@code Extension} builder instance using the specified object as a basis.
      *
      * @param from the {@code Extension} 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(Extension from, boolean forceCopy) {
         return new Builder(from, forceCopy);
     }
 
     /**
      * Builder class used to create Extension instances.
      * @see #with()
      * @see #newBuilder()
      */
     @NotThreadSafe
     public static class Builder
     {
         Extension base;
         String groupId;
         String artifactId;
         String version;
         XmlNode configuration;
         Map<Object, InputLocation> locations;
         InputLocation importedFrom;
 
         protected Builder(boolean withDefaults) {
             if (withDefaults) {
             }
         }
 
         protected Builder(Extension base, boolean forceCopy) {
             if (forceCopy) {
                 this.groupId = base.groupId;
                 this.artifactId = base.artifactId;
                 this.version = base.version;
                 this.configuration = base.configuration;
                 this.locations = base.locations;
                 this.importedFrom = base.importedFrom;
             } 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 configuration(XmlNode configuration) {
             this.configuration = configuration;
             return this;
         }
 
 
         @Nonnull
         public Builder location(Object key, InputLocation location) {
             if (location != null) {
                 if (!(this.locations instanceof HashMap)) {
                     this.locations = this.locations != null ? new HashMap<>(this.locations) : new HashMap<>();
                 }
                 this.locations.put(key, location);
             }
             return this;
         }
 
         @Nonnull
         public Builder importedFrom(InputLocation importedFrom) {
             this.importedFrom = importedFrom;
             return this;
         }
 
         @Nonnull
         public Extension 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)
                     && (configuration == null || configuration == base.configuration)
             ) {
                 return base;
             }
             return new Extension(this);
         }
 
         Map<Object, InputLocation> computeLocations() {
             Map<Object, InputLocation> newlocs = locations != null ? locations : Map.of();
             Map<Object, InputLocation> oldlocs = base != null ? base.locations : Map.of();
             if (newlocs.isEmpty()) {
                 return Map.copyOf(oldlocs);
             }
             if (oldlocs.isEmpty()) {
                 return Map.copyOf(newlocs);
             }
             return Stream.concat(newlocs.entrySet().stream(), oldlocs.entrySet().stream())
                     // Keep value from newlocs in case of duplicates
                     .collect(Collectors.toUnmodifiableMap(Map.Entry::getKey, Map.Entry::getValue, (v1, v2) -> v1));
         }
     }
 
 
             
     /**
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public boolean equals(Object o) {
         if (this == o) {
             return true;
         } else if (!(o instanceof Extension)) {
             return false;
         } else {
             Extension e = (Extension) o;
             return java.util.Objects.equals(e.getArtifactId(), getArtifactId())
                 && java.util.Objects.equals(e.getGroupId(), getGroupId())
                 && java.util.Objects.equals(e.getVersion(), getVersion());
         }
     }
 
     /**
      * @see java.lang.Object#hashCode()
      */
     public int hashCode() {
         return java.util.Objects.hash(getArtifactId(), getGroupId(), getVersion());
     }
             
           
 }