// =================== DO NOT EDIT THIS FILE ====================
   //  Generated by Modello Velocity from transformer.vm
   //  template, any modifications will be overwritten.
   // ==============================================================
   package org.apache.maven.settings.v4;
   
   import java.io.ObjectStreamException;
   import java.util.AbstractList;
   import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Objects;
  import java.util.function.BinaryOperator;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  import org.apache.maven.api.annotations.Generated;
  import org.apache.maven.api.xml.XmlNode;
  import org.apache.maven.api.settings.TrackableBase;
  import org.apache.maven.api.settings.IdentifiableBase;
  import org.apache.maven.api.settings.Settings;
  import org.apache.maven.api.settings.Proxy;
  import org.apache.maven.api.settings.Server;
  import org.apache.maven.api.settings.Mirror;
  import org.apache.maven.api.settings.Profile;
  import org.apache.maven.api.settings.Activation;
  import org.apache.maven.api.settings.RepositoryBase;
  import org.apache.maven.api.settings.Repository;
  import org.apache.maven.api.settings.RepositoryPolicy;
  import org.apache.maven.api.settings.ActivationProperty;
  import org.apache.maven.api.settings.ActivationOS;
  import org.apache.maven.api.settings.ActivationFile;
  import org.apache.maven.api.settings.InputLocation;
  import org.apache.maven.api.settings.InputSource;
  import org.codehaus.plexus.util.xml.Xpp3Dom;
  
  @Generated
  public class SettingsTransformer {
  
      private final Function<String, String> transformer;
  
      public SettingsTransformer(Function<String, String> transformer) {
          this.transformer = transformer;
      }
  
      /**
       * Transforms the given model
       */
      public Settings visit(Settings target) {
          Objects.requireNonNull(target, "target cannot be null");
          return transformSettings(target);
      }
  
      /**
       * The transformation function.
       */
      protected String transform(String value) {
          return transformer.apply(value);
      }
  
      protected TrackableBase transformTrackableBase(TrackableBase target) {
          if (target == null) {
              return null;
          }
          TrackableBase.Builder builder = TrackableBase.newBuilder(target);
          return builder.build();
      }
  
  
      protected IdentifiableBase transformIdentifiableBase(IdentifiableBase target) {
          if (target == null) {
              return null;
          }
          IdentifiableBase.Builder builder = IdentifiableBase.newBuilder(target);
          transformIdentifiableBase_Id(builder, target);
          return builder.build();
      }
  
      protected void transformIdentifiableBase_Id(IdentifiableBase.Builder builder, IdentifiableBase target) {
          String newVal = transform(target.getId());
          builder.id(newVal != target.getId() ? newVal : null);
      }
  
      protected Settings transformSettings(Settings target) {
          if (target == null) {
              return null;
          }
          Settings.Builder builder = Settings.newBuilder(target);
          transformSettings_LocalRepository(builder, target);
          transformSettings_InteractiveMode(builder, target);
          transformSettings_UsePluginRegistry(builder, target);
          transformSettings_Offline(builder, target);
          transformSettings_Proxies(builder, target);
          transformSettings_Servers(builder, target);
         transformSettings_Mirrors(builder, target);
         transformSettings_Repositories(builder, target);
         transformSettings_PluginRepositories(builder, target);
         transformSettings_Profiles(builder, target);
         transformSettings_ActiveProfiles(builder, target);
         transformSettings_PluginGroups(builder, target);
         return builder.build();
     }
 
     protected void transformSettings_LocalRepository(Settings.Builder builder, Settings target) {
         String newVal = transform(target.getLocalRepository());
         builder.localRepository(newVal != target.getLocalRepository() ? newVal : null);
     }
     protected void transformSettings_InteractiveMode(Settings.Builder builder, Settings target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformSettings_UsePluginRegistry(Settings.Builder builder, Settings target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformSettings_Offline(Settings.Builder builder, Settings target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformSettings_Proxies(Settings.Builder builder, Settings target) {
         builder.proxies(transform(target.getProxies(), this::transformProxy));
     }
     protected void transformSettings_Servers(Settings.Builder builder, Settings target) {
         builder.servers(transform(target.getServers(), this::transformServer));
     }
     protected void transformSettings_Mirrors(Settings.Builder builder, Settings target) {
         builder.mirrors(transform(target.getMirrors(), this::transformMirror));
     }
     protected void transformSettings_Repositories(Settings.Builder builder, Settings target) {
         builder.repositories(transform(target.getRepositories(), this::transformRepository));
     }
     protected void transformSettings_PluginRepositories(Settings.Builder builder, Settings target) {
         builder.pluginRepositories(transform(target.getPluginRepositories(), this::transformRepository));
     }
     protected void transformSettings_Profiles(Settings.Builder builder, Settings target) {
         builder.profiles(transform(target.getProfiles(), this::transformProfile));
     }
     protected void transformSettings_ActiveProfiles(Settings.Builder builder, Settings target) {
         builder.activeProfiles(transform(target.getActiveProfiles(), this::transform));
     }
     protected void transformSettings_PluginGroups(Settings.Builder builder, Settings target) {
         builder.pluginGroups(transform(target.getPluginGroups(), this::transform));
     }
 
     protected Proxy transformProxy(Proxy target) {
         if (target == null) {
             return null;
         }
         Proxy.Builder builder = Proxy.newBuilder(target);
         transformProxy_ActiveString(builder, target);
         transformProxy_Protocol(builder, target);
         transformProxy_Username(builder, target);
         transformProxy_Password(builder, target);
         transformProxy_PortString(builder, target);
         transformProxy_Host(builder, target);
         transformProxy_NonProxyHosts(builder, target);
         transformIdentifiableBase_Id(builder, target);
         return builder.build();
     }
 
     protected void transformProxy_ActiveString(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getActiveString());
         builder.activeString(newVal != target.getActiveString() ? newVal : null);
     }
     protected void transformProxy_Protocol(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getProtocol());
         builder.protocol(newVal != target.getProtocol() ? newVal : null);
     }
     protected void transformProxy_Username(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getUsername());
         builder.username(newVal != target.getUsername() ? newVal : null);
     }
     protected void transformProxy_Password(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getPassword());
         builder.password(newVal != target.getPassword() ? newVal : null);
     }
     protected void transformProxy_PortString(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getPortString());
         builder.portString(newVal != target.getPortString() ? newVal : null);
     }
     protected void transformProxy_Host(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getHost());
         builder.host(newVal != target.getHost() ? newVal : null);
     }
     protected void transformProxy_NonProxyHosts(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getNonProxyHosts());
         builder.nonProxyHosts(newVal != target.getNonProxyHosts() ? newVal : null);
     }
     protected void transformProxy_Id(Proxy.Builder builder, Proxy target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
 
     protected Server transformServer(Server target) {
         if (target == null) {
             return null;
         }
         Server.Builder builder = Server.newBuilder(target);
         transformServer_Username(builder, target);
         transformServer_Password(builder, target);
         transformServer_PrivateKey(builder, target);
         transformServer_Passphrase(builder, target);
         transformServer_FilePermissions(builder, target);
         transformServer_DirectoryPermissions(builder, target);
         transformServer_Configuration(builder, target);
         transformIdentifiableBase_Id(builder, target);
         return builder.build();
     }
 
     protected void transformServer_Username(Server.Builder builder, Server target) {
         String newVal = transform(target.getUsername());
         builder.username(newVal != target.getUsername() ? newVal : null);
     }
     protected void transformServer_Password(Server.Builder builder, Server target) {
         String newVal = transform(target.getPassword());
         builder.password(newVal != target.getPassword() ? newVal : null);
     }
     protected void transformServer_PrivateKey(Server.Builder builder, Server target) {
         String newVal = transform(target.getPrivateKey());
         builder.privateKey(newVal != target.getPrivateKey() ? newVal : null);
     }
     protected void transformServer_Passphrase(Server.Builder builder, Server target) {
         String newVal = transform(target.getPassphrase());
         builder.passphrase(newVal != target.getPassphrase() ? newVal : null);
     }
     protected void transformServer_FilePermissions(Server.Builder builder, Server target) {
         String newVal = transform(target.getFilePermissions());
         builder.filePermissions(newVal != target.getFilePermissions() ? newVal : null);
     }
     protected void transformServer_DirectoryPermissions(Server.Builder builder, Server target) {
         String newVal = transform(target.getDirectoryPermissions());
         builder.directoryPermissions(newVal != target.getDirectoryPermissions() ? newVal : null);
     }
     protected void transformServer_Configuration(Server.Builder builder, Server target) {
         XmlNode newVal = transform(target.getConfiguration());
         builder.configuration(newVal != target.getConfiguration() ? newVal : null);
     }
     protected void transformServer_Id(Server.Builder builder, Server target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
 
     protected Mirror transformMirror(Mirror target) {
         if (target == null) {
             return null;
         }
         Mirror.Builder builder = Mirror.newBuilder(target);
         transformMirror_MirrorOf(builder, target);
         transformMirror_Name(builder, target);
         transformMirror_Url(builder, target);
         transformMirror_Layout(builder, target);
         transformMirror_MirrorOfLayouts(builder, target);
         transformMirror_Blocked(builder, target);
         transformIdentifiableBase_Id(builder, target);
         return builder.build();
     }
 
     protected void transformMirror_MirrorOf(Mirror.Builder builder, Mirror target) {
         String newVal = transform(target.getMirrorOf());
         builder.mirrorOf(newVal != target.getMirrorOf() ? newVal : null);
     }
     protected void transformMirror_Name(Mirror.Builder builder, Mirror target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformMirror_Url(Mirror.Builder builder, Mirror target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformMirror_Layout(Mirror.Builder builder, Mirror target) {
         String newVal = transform(target.getLayout());
         builder.layout(newVal != target.getLayout() ? newVal : null);
     }
     protected void transformMirror_MirrorOfLayouts(Mirror.Builder builder, Mirror target) {
         String newVal = transform(target.getMirrorOfLayouts());
         builder.mirrorOfLayouts(newVal != target.getMirrorOfLayouts() ? newVal : null);
     }
     protected void transformMirror_Blocked(Mirror.Builder builder, Mirror target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformMirror_Id(Mirror.Builder builder, Mirror target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
 
     protected Profile transformProfile(Profile target) {
         if (target == null) {
             return null;
         }
         Profile.Builder builder = Profile.newBuilder(target);
         transformProfile_Activation(builder, target);
         transformProfile_Properties(builder, target);
         transformProfile_Repositories(builder, target);
         transformProfile_PluginRepositories(builder, target);
         transformIdentifiableBase_Id(builder, target);
         return builder.build();
     }
 
     protected void transformProfile_Activation(Profile.Builder builder, Profile target) {
         Activation newVal = transformActivation(target.getActivation());
         builder.activation(newVal != target.getActivation() ? newVal : null);
     }
     protected void transformProfile_Properties(Profile.Builder builder, Profile target) {
         Map<String, String> props = target.getProperties();
         Map<String, String> newProps = null;
         for (Map.Entry<String, String> entry : props.entrySet()) {
             String newVal = transform(entry.getValue());
             if (newVal != null && newVal != entry.getValue()) {
                 if (newProps == null) {
                     newProps = new HashMap<>();
                     newProps.putAll(props);
                     builder.properties(newProps);
                 }
                 newProps.put(entry.getKey(), newVal);
             }
         }
     }
     protected void transformProfile_Repositories(Profile.Builder builder, Profile target) {
         builder.repositories(transform(target.getRepositories(), this::transformRepository));
     }
     protected void transformProfile_PluginRepositories(Profile.Builder builder, Profile target) {
         builder.pluginRepositories(transform(target.getPluginRepositories(), this::transformRepository));
     }
     protected void transformProfile_Id(Profile.Builder builder, Profile target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
 
     protected Activation transformActivation(Activation target) {
         if (target == null) {
             return null;
         }
         Activation.Builder builder = Activation.newBuilder(target);
         transformActivation_ActiveByDefault(builder, target);
         transformActivation_Jdk(builder, target);
         transformActivation_Os(builder, target);
         transformActivation_Property(builder, target);
         transformActivation_File(builder, target);
         return builder.build();
     }
 
     protected void transformActivation_ActiveByDefault(Activation.Builder builder, Activation target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformActivation_Jdk(Activation.Builder builder, Activation target) {
         String newVal = transform(target.getJdk());
         builder.jdk(newVal != target.getJdk() ? newVal : null);
     }
     protected void transformActivation_Os(Activation.Builder builder, Activation target) {
         ActivationOS newVal = transformActivationOS(target.getOs());
         builder.os(newVal != target.getOs() ? newVal : null);
     }
     protected void transformActivation_Property(Activation.Builder builder, Activation target) {
         ActivationProperty newVal = transformActivationProperty(target.getProperty());
         builder.property(newVal != target.getProperty() ? newVal : null);
     }
     protected void transformActivation_File(Activation.Builder builder, Activation target) {
         ActivationFile newVal = transformActivationFile(target.getFile());
         builder.file(newVal != target.getFile() ? newVal : null);
     }
 
     protected RepositoryBase transformRepositoryBase(RepositoryBase target) {
         if (target == null) {
             return null;
         }
         RepositoryBase.Builder builder = RepositoryBase.newBuilder(target);
         transformRepositoryBase_Name(builder, target);
         transformRepositoryBase_Url(builder, target);
         transformRepositoryBase_Layout(builder, target);
         transformIdentifiableBase_Id(builder, target);
         return builder.build();
     }
 
     protected void transformRepositoryBase_Name(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformRepositoryBase_Url(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformRepositoryBase_Layout(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getLayout());
         builder.layout(newVal != target.getLayout() ? newVal : null);
     }
     protected void transformRepositoryBase_Id(RepositoryBase.Builder builder, RepositoryBase target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
 
     protected Repository transformRepository(Repository target) {
         if (target == null) {
             return null;
         }
         Repository.Builder builder = Repository.newBuilder(target);
         transformRepository_Releases(builder, target);
         transformRepository_Snapshots(builder, target);
         transformRepositoryBase_Name(builder, target);
         transformRepositoryBase_Url(builder, target);
         transformRepositoryBase_Layout(builder, target);
         transformIdentifiableBase_Id(builder, target);
         return builder.build();
     }
 
     protected void transformRepository_Releases(Repository.Builder builder, Repository target) {
         RepositoryPolicy newVal = transformRepositoryPolicy(target.getReleases());
         builder.releases(newVal != target.getReleases() ? newVal : null);
     }
     protected void transformRepository_Snapshots(Repository.Builder builder, Repository target) {
         RepositoryPolicy newVal = transformRepositoryPolicy(target.getSnapshots());
         builder.snapshots(newVal != target.getSnapshots() ? newVal : null);
     }
     protected void transformRepository_Name(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformRepository_Url(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getUrl());
         builder.url(newVal != target.getUrl() ? newVal : null);
     }
     protected void transformRepository_Layout(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getLayout());
         builder.layout(newVal != target.getLayout() ? newVal : null);
     }
     protected void transformRepository_Id(Repository.Builder builder, Repository target) {
         String newVal = transform(target.getId());
         builder.id(newVal != target.getId() ? newVal : null);
     }
 
     protected RepositoryPolicy transformRepositoryPolicy(RepositoryPolicy target) {
         if (target == null) {
             return null;
         }
         RepositoryPolicy.Builder builder = RepositoryPolicy.newBuilder(target);
         transformRepositoryPolicy_Enabled(builder, target);
         transformRepositoryPolicy_UpdatePolicy(builder, target);
         transformRepositoryPolicy_ChecksumPolicy(builder, target);
         return builder.build();
     }
 
     protected void transformRepositoryPolicy_Enabled(RepositoryPolicy.Builder builder, RepositoryPolicy target) {
         // nothing to do, the transformer only handles strings
     }
     protected void transformRepositoryPolicy_UpdatePolicy(RepositoryPolicy.Builder builder, RepositoryPolicy target) {
         String newVal = transform(target.getUpdatePolicy());
         builder.updatePolicy(newVal != target.getUpdatePolicy() ? newVal : null);
     }
     protected void transformRepositoryPolicy_ChecksumPolicy(RepositoryPolicy.Builder builder, RepositoryPolicy target) {
         String newVal = transform(target.getChecksumPolicy());
         builder.checksumPolicy(newVal != target.getChecksumPolicy() ? newVal : null);
     }
 
     protected ActivationProperty transformActivationProperty(ActivationProperty target) {
         if (target == null) {
             return null;
         }
         ActivationProperty.Builder builder = ActivationProperty.newBuilder(target);
         transformActivationProperty_Name(builder, target);
         transformActivationProperty_Value(builder, target);
         return builder.build();
     }
 
     protected void transformActivationProperty_Name(ActivationProperty.Builder builder, ActivationProperty target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformActivationProperty_Value(ActivationProperty.Builder builder, ActivationProperty target) {
         String newVal = transform(target.getValue());
         builder.value(newVal != target.getValue() ? newVal : null);
     }
 
     protected ActivationOS transformActivationOS(ActivationOS target) {
         if (target == null) {
             return null;
         }
         ActivationOS.Builder builder = ActivationOS.newBuilder(target);
         transformActivationOS_Name(builder, target);
         transformActivationOS_Family(builder, target);
         transformActivationOS_Arch(builder, target);
         transformActivationOS_Version(builder, target);
         return builder.build();
     }
 
     protected void transformActivationOS_Name(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getName());
         builder.name(newVal != target.getName() ? newVal : null);
     }
     protected void transformActivationOS_Family(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getFamily());
         builder.family(newVal != target.getFamily() ? newVal : null);
     }
     protected void transformActivationOS_Arch(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getArch());
         builder.arch(newVal != target.getArch() ? newVal : null);
     }
     protected void transformActivationOS_Version(ActivationOS.Builder builder, ActivationOS target) {
         String newVal = transform(target.getVersion());
         builder.version(newVal != target.getVersion() ? newVal : null);
     }
 
     protected ActivationFile transformActivationFile(ActivationFile target) {
         if (target == null) {
             return null;
         }
         ActivationFile.Builder builder = ActivationFile.newBuilder(target);
         transformActivationFile_Missing(builder, target);
         transformActivationFile_Exists(builder, target);
         return builder.build();
     }
 
     protected void transformActivationFile_Missing(ActivationFile.Builder builder, ActivationFile target) {
         String newVal = transform(target.getMissing());
         builder.missing(newVal != target.getMissing() ? newVal : null);
     }
     protected void transformActivationFile_Exists(ActivationFile.Builder builder, ActivationFile target) {
         String newVal = transform(target.getExists());
         builder.exists(newVal != target.getExists() ? newVal : null);
     }
 
     protected <T> List<T> transform(List<T> list, Function<T, T> transformer) {
         List<T> newList = null;
         for (int i = 0; i < list.size(); i++) {
             T newVal = transformer.apply(list.get(i));
             if (newVal != list.get(i)) {
                 if (newList == null) {
                     newList = new ArrayList<>(list);
                 }
                 newList.set(i, newVal);
             }
         }
         return newList;
     }
 
     protected XmlNode transform(XmlNode node) {
         if (node != null) {
             Xpp3Dom xpp = new Xpp3Dom(node);
             transform(xpp);
             return xpp.getDom();
         }
         return node;
     }
 
     protected void transform(Xpp3Dom dom) {
         if (dom != null) {
             String org, val;
             // Content
             org = dom.getValue();
             val = transform(org);
             if (org != val) {
                 dom.setValue(val);
             }
             // Attributes
             for (String attr : dom.getAttributeNames()) {
                 org = dom.getAttribute(attr);
                 val = transform(org);
                 if (org != val) {
                     dom.setAttribute(attr, val);
                 }
             }
             // Children
             for (int i = 0, l = dom.getChildCount(); i < l; i++) {
                 transform(dom.getChild(i));
             }
         }
     }
 }