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Posted to commits@maven.apache.org by kh...@apache.org on 2020/03/26 16:18:01 UTC

[maven-artifact-transfer] 01/02: Further refactoring.

This is an automated email from the ASF dual-hosted git repository.

khmarbaise pushed a commit to branch MSHARED-864
in repository https://gitbox.apache.org/repos/asf/maven-artifact-transfer.git

commit a0b39133645974688f7eff4dfa22daff04765acc
Author: Karl Heinz Marbaise <kh...@apache.org>
AuthorDate: Sun Mar 22 13:51:54 2020 +0100

    Further refactoring.
---
 .../transfer/artifact/deploy/internal/Invoker.java |  34 ++----
 .../artifact/install/internal/Invoker.java         |  12 ++-
 .../artifact/resolve/internal/Invoker.java         |  43 ++------
 .../transfer/collection/internal/Invoker.java      |  49 ++-------
 .../dependencies/collect/internal/Invoker.java     | 119 +++++++++------------
 .../internal/Maven30DependencyCollector.java       |  86 +++++++--------
 .../internal/Maven31DependencyCollector.java       |  87 +++++++--------
 .../dependencies/resolve/internal/Invoker.java     |  70 +++---------
 .../resolve/internal/Maven30ArtifactResult.java    |   8 +-
 .../install/internal/DefaultProjectInstaller.java  |   4 +-
 .../transfer/repository/internal/Invoker.java      |   8 +-
 11 files changed, 179 insertions(+), 341 deletions(-)

diff --git a/src/main/java/org/apache/maven/shared/transfer/artifact/deploy/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/artifact/deploy/internal/Invoker.java
index be93619..485e58d 100644
--- a/src/main/java/org/apache/maven/shared/transfer/artifact/deploy/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/artifact/deploy/internal/Invoker.java
@@ -36,25 +36,13 @@ final class Invoker
     public static <T> T invoke( Object object, String method )
         throws ArtifactDeployerException
     {
-        return (T) invoke( object.getClass(), object, method );
-    }
-
-    public static <T> T invoke( Class<?> objectClazz, Object object, String method )
-        throws ArtifactDeployerException
-    {
         try
         {
-            return (T) objectClazz.getMethod( method ).invoke( object );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new ArtifactDeployerException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new ArtifactDeployerException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) object.getClass().getMethod( method ).invoke( object );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new ArtifactDeployerException( e.getMessage(), e );
         }
@@ -65,17 +53,11 @@ final class Invoker
     {
         try
         {
-            return (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new ArtifactDeployerException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new ArtifactDeployerException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new ArtifactDeployerException( e.getMessage(), e );
         }
diff --git a/src/main/java/org/apache/maven/shared/transfer/artifact/install/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/artifact/install/internal/Invoker.java
index d1389ec..20df360 100644
--- a/src/main/java/org/apache/maven/shared/transfer/artifact/install/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/artifact/install/internal/Invoker.java
@@ -36,15 +36,17 @@ final class Invoker
     public static <T> T invoke( Object object, String method )
         throws ArtifactInstallerException
     {
-        return (T) invoke( object.getClass(), object, method );
+        return invoke( object.getClass(), object, method );
     }
 
-    public static <T> T invoke( Class<?> objectClazz, Object object, String method )
+    private static <T> T invoke( Class<?> objectClazz, Object object, String method )
         throws ArtifactInstallerException
     {
         try
         {
-            return (T) objectClazz.getMethod( method ).invoke( object );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( method ).invoke( object );
+            return invoke;
         }
         catch ( IllegalAccessException e )
         {
@@ -65,7 +67,9 @@ final class Invoker
     {
         try
         {
-            return (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            return invoke;
         }
         catch ( IllegalAccessException e )
         {
diff --git a/src/main/java/org/apache/maven/shared/transfer/artifact/resolve/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/artifact/resolve/internal/Invoker.java
index ebbea34..e46c199 100644
--- a/src/main/java/org/apache/maven/shared/transfer/artifact/resolve/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/artifact/resolve/internal/Invoker.java
@@ -28,6 +28,7 @@ import org.apache.maven.shared.transfer.artifact.resolve.ArtifactResolverExcepti
  */
 final class Invoker
 {
+
     private Invoker()
     {
         // do not instantiate
@@ -36,15 +37,17 @@ final class Invoker
     public static <T> T invoke( Object object, String method )
         throws ArtifactResolverException
     {
-        return (T) invoke( object.getClass(), object, method );
+        return invoke( object.getClass(), object, method );
     }
 
-    public static <T> T invoke( Class<?> objectClazz, Object object, String method )
+    private static <T> T invoke( Class<?> objectClazz, Object object, String method )
         throws ArtifactResolverException
     {
         try
         {
-            return (T) objectClazz.getMethod( method ).invoke( object );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( method ).invoke( object );
+            return invoke;
         }
         catch ( IllegalAccessException e )
         {
@@ -65,7 +68,9 @@ final class Invoker
     {
         try
         {
-            return (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            return invoke;
         }
         catch ( IllegalAccessException e )
         {
@@ -81,34 +86,4 @@ final class Invoker
         }
     }
 
-    /**
-     * <strong>Note:</strong> Ensure that argClasses and args have the same number of elements
-     * 
-     * @param objectClazz the class of the static method
-     * @param staticMethod the static method to call
-     * @param argClasses the classes of the argument, used to select the right static method
-     * @param args the actual arguments to be passed
-     * @return the result of the method invocation
-     * @throws ArtifactResolverException if any checked exception occurs
-     */
-    public static Object invoke( Class<?> objectClazz, String staticMethod, Class<?>[] argClasses, Object[] args )
-        throws ArtifactResolverException
-    {
-        try
-        {
-            return objectClazz.getMethod( staticMethod, argClasses ).invoke( null, args );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new ArtifactResolverException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new ArtifactResolverException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
-        {
-            throw new ArtifactResolverException( e.getMessage(), e );
-        }
-    }
 }
diff --git a/src/main/java/org/apache/maven/shared/transfer/collection/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/collection/internal/Invoker.java
index 5e07349..c5290ac 100644
--- a/src/main/java/org/apache/maven/shared/transfer/collection/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/collection/internal/Invoker.java
@@ -20,10 +20,9 @@ package org.apache.maven.shared.transfer.collection.internal;
  */
 
 import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 
-import org.apache.maven.shared.transfer.dependencies.collect.DependencyCollectorException;
 import org.apache.maven.shared.transfer.collection.DependencyCollectionException;
+import org.apache.maven.shared.transfer.dependencies.collect.DependencyCollectorException;
 
 /**
  * Invokes method on objects using reflection.
@@ -38,28 +37,13 @@ final class Invoker
     public static <T> T invoke( Object object, String method )
         throws DependencyCollectionException
     {
-        @SuppressWarnings( "unchecked" )
-        T invoke = (T) invoke( object.getClass(), object, method );
-        return invoke;
-    }
-
-    @SuppressWarnings( "unchecked" )
-    public static <T> T invoke( Class<?> objectClazz, Object object, String method )
-        throws DependencyCollectionException
-    {
         try
         {
-            return (T) objectClazz.getMethod( method ).invoke( object );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectionException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyCollectionException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) object.getClass().getMethod( method ).invoke( object );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyCollectionException( e.getMessage(), e );
         }
@@ -70,20 +54,11 @@ final class Invoker
     {
         try
         {
-            Method method = objectClazz.getMethod( staticMethod, argClazz );
             @SuppressWarnings( "unchecked" )
-            T invoke = (T) method.invoke( null, arg );
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
             return invoke;
         }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectionException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyCollectionException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyCollectionException( e.getMessage(), e );
         }
@@ -108,15 +83,7 @@ final class Invoker
             T invoke = (T) objectClazz.getMethod( staticMethod, argClasses ).invoke( null, args );
             return invoke;
         }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectionException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyCollectionException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyCollectionException( e.getMessage(), e );
         }
diff --git a/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Invoker.java
index 5a03346..6540fae 100644
--- a/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Invoker.java
@@ -33,105 +33,86 @@ final class Invoker
         // do not instantiate
     }
 
-    public static <T> T invoke( Object object, String method )
-        throws DependencyCollectorException
-    {
-        T invoke = invoke( object.getClass(), object, method );
-        return (T) invoke;
-    }
-
-    public static <T> T invoke( Class<?> objectClazz, Object object, String method )
-        throws DependencyCollectorException
+    public static <T> T invoke( Object object, String method ) throws DependencyCollectorException
     {
         try
         {
             @SuppressWarnings( "unchecked" )
-            T invoke = (T) objectClazz.getMethod( method ).invoke( object );
+            T invoke = (T) object.getClass().getMethod( method ).invoke( object );
             return invoke;
         }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyCollectorException( e.getMessage(), e );
         }
     }
 
-    public static Object invoke( Object object, String method, Class<?> argClazz, Object arg )
-        throws DependencyCollectorException
-    {
-        try
-        {
-            final Class<?> objectClazz = object.getClass();
-            return objectClazz.getMethod( method, argClazz ).invoke( object, arg );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
-        }
-    }
-    
     public static <T> T invoke( Class<?> objectClazz, String staticMethod, Class<?> argClazz, Object arg )
-                    throws DependencyCollectorException
+            throws DependencyCollectorException
     {
         try
         {
-            return (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyCollectorException( e.getMessage(), e );
         }
     }
-    
+    //
+    //    public interface ExceptionFactory<E extends Exception>
+    //    {
+    //        E create(String message);
+    //    }
+    //
+    //    public static <T, E extends Exception> T invokeX( Class<?> objectClazz,
+    //   String staticMethod, Class<?> argClazz, Object arg )
+    //            throws E
+    //    {
+    //        try
+    //        {
+    //            return (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+    //        }
+    //        catch ( IllegalAccessException e )
+    //        {
+    //
+    //            throw new DependencyCollectorException( e.getMessage(), e );
+    //        }
+    //        catch ( InvocationTargetException e )
+    //        {
+    //            throw new DependencyCollectorException( e.getMessage(), e );
+    //        }
+    //        catch ( NoSuchMethodException e )
+    //        {
+    //            throw new DependencyCollectorException( e.getMessage(), e );
+    //        }
+    //    }
+
     /**
-     * <strong>Note:</strong> Ensure that argClasses and args have the same number of elements 
-     * 
-     * @param objectClazz the class of the static method
+     * @param objectClazz  the class of the static method
      * @param staticMethod the static method to call
-     * @param argClasses the classes of the argument, used to select the right static method
-     * @param args the actual arguments to be passed
+     * @param argClasses   the classes of the argument, used to select the right static method
+     * @param args         the actual arguments to be passed
      * @return the result of the method invocation
      * @throws DependencyCollectorException if any checked exception occurs
      */
-    public static Object invoke( Class<?> objectClazz, String staticMethod, Class<?>[] argClasses, Object[] args )
-                    throws DependencyCollectorException
+    public static <T> T invoke( Class<?> objectClazz, String staticMethod, Class<?>[] argClasses, Object[] args )
+            throws DependencyCollectorException
     {
-        try
+        if ( args.length != argClasses.length )
         {
-            return objectClazz.getMethod( staticMethod, argClasses ).invoke( null, args );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyCollectorException( e.getMessage(), e );
+            throw new IllegalArgumentException( "The number of elements in argClasses and args is not the same." );
         }
-        catch ( InvocationTargetException e )
+
+        try
         {
-            throw new DependencyCollectorException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClasses ).invoke( null, args );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyCollectorException( e.getMessage(), e );
         }
diff --git a/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven30DependencyCollector.java b/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven30DependencyCollector.java
index 057e0bd..1a33fbc 100644
--- a/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven30DependencyCollector.java
+++ b/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven30DependencyCollector.java
@@ -42,23 +42,21 @@ import org.sonatype.aether.util.artifact.DefaultArtifact;
 
 /**
  * Maven 3.0 implementation of the {@link DependencyCollector}
- * 
- * @author Robert Scholte
  *
+ * @author Robert Scholte
  */
-class Maven30DependencyCollector
-    implements MavenDependencyCollector
+class Maven30DependencyCollector implements MavenDependencyCollector
 {
     private final RepositorySystem repositorySystem;
 
     private final ArtifactHandlerManager artifactHandlerManager;
 
     private final RepositorySystemSession session;
-    
+
     private final List<RemoteRepository> aetherRepositories;
-    
+
     Maven30DependencyCollector( RepositorySystem repositorySystem, ArtifactHandlerManager artifactHandlerManager,
-                                RepositorySystemSession session, List<RemoteRepository> aetherRepositories )
+            RepositorySystemSession session, List<RemoteRepository> aetherRepositories )
     {
         super();
         this.repositorySystem = repositorySystem;
@@ -67,13 +65,22 @@ class Maven30DependencyCollector
         this.aetherRepositories = aetherRepositories;
     }
 
+    private static Dependency toDependency( org.apache.maven.model.Dependency mavenDependency,
+            ArtifactTypeRegistry typeRegistry ) throws DependencyCollectorException
+    {
+        Class<?>[] argClasses = new Class<?>[] {org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class};
+
+        Object[] args = new Object[] {mavenDependency, typeRegistry};
+
+        return (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
+    }
+
     @Override
     public CollectorResult collectDependencies( org.apache.maven.model.Dependency root )
-        throws DependencyCollectorException
+            throws DependencyCollectorException
     {
-        ArtifactTypeRegistry typeRegistry =
-                        (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
-                                                               ArtifactHandlerManager.class, artifactHandlerManager );
+        ArtifactTypeRegistry typeRegistry = Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
+                ArtifactHandlerManager.class, artifactHandlerManager );
 
         CollectRequest request = new CollectRequest();
         request.setRoot( toDependency( root, typeRegistry ) );
@@ -82,42 +89,39 @@ class Maven30DependencyCollector
     }
 
     @Override
-    public CollectorResult collectDependencies( DependableCoordinate root )
-        throws DependencyCollectorException
+    public CollectorResult collectDependencies( DependableCoordinate root ) throws DependencyCollectorException
     {
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getType() );
-        
+
         String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
-        
+
         Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), root.getClassifier(),
-                                                       extension, root.getVersion() );
-        
+                extension, root.getVersion() );
+
         CollectRequest request = new CollectRequest();
         request.setRoot( new Dependency( aetherArtifact, null ) );
 
         return collectDependencies( request );
     }
-    
+
     @Override
-    public CollectorResult collectDependencies( Model root )
-        throws DependencyCollectorException
+    public CollectorResult collectDependencies( Model root ) throws DependencyCollectorException
     {
         // Are there examples where packaging and type are NOT in sync
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getPackaging() );
-        
+
         String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
-        
-        Artifact aetherArtifact =
-            new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension, root.getVersion() );
-        
+
+        Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension,
+                root.getVersion() );
+
         CollectRequest request = new CollectRequest();
         request.setRoot( new Dependency( aetherArtifact, null ) );
 
-        ArtifactTypeRegistry typeRegistry =
-                        (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
-                                                               ArtifactHandlerManager.class, artifactHandlerManager );
+        ArtifactTypeRegistry typeRegistry = Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
+                ArtifactHandlerManager.class, artifactHandlerManager );
 
-        List<Dependency> aetherDependencies = new ArrayList<Dependency>( root.getDependencies().size() );
+        List<Dependency> aetherDependencies = new ArrayList<>( root.getDependencies().size() );
         for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencies() )
         {
             aetherDependencies.add( toDependency( mavenDependency, typeRegistry ) );
@@ -126,22 +130,21 @@ class Maven30DependencyCollector
 
         if ( root.getDependencyManagement() != null )
         {
-            List<Dependency> aetherManagerDependencies =
-                new ArrayList<Dependency>( root.getDependencyManagement().getDependencies().size() );
-            
+            List<Dependency> aetherManagerDependencies = new ArrayList<>(
+                    root.getDependencyManagement().getDependencies().size() );
+
             for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencyManagement().getDependencies() )
             {
                 aetherManagerDependencies.add( toDependency( mavenDependency, typeRegistry ) );
             }
-            
+
             request.setManagedDependencies( aetherManagerDependencies );
         }
-        
+
         return collectDependencies( request );
     }
 
-    private CollectorResult collectDependencies( CollectRequest request )
-        throws DependencyCollectorException
+    private CollectorResult collectDependencies( CollectRequest request ) throws DependencyCollectorException
     {
         request.setRepositories( aetherRepositories );
 
@@ -154,15 +157,4 @@ class Maven30DependencyCollector
             throw new DependencyCollectorException( e.getMessage(), e );
         }
     }
-
-    private static Dependency toDependency( org.apache.maven.model.Dependency mavenDependency,
-                                            ArtifactTypeRegistry typeRegistry )
-        throws DependencyCollectorException
-    {
-        Class<?>[] argClasses = new Class<?>[] { org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class };
-
-        Object[] args = new Object[] { mavenDependency, typeRegistry };
-
-        return (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
-    }
 }
diff --git a/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven31DependencyCollector.java b/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven31DependencyCollector.java
index 0ee0385..de98210 100644
--- a/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven31DependencyCollector.java
+++ b/src/main/java/org/apache/maven/shared/transfer/dependencies/collect/internal/Maven31DependencyCollector.java
@@ -42,23 +42,21 @@ import org.eclipse.aether.repository.RemoteRepository;
 
 /**
  * Maven 3.1+ implementation of the {@link DependencyCollector}
- * 
- * @author Robert Scholte
  *
+ * @author Robert Scholte
  */
-class Maven31DependencyCollector
-    implements MavenDependencyCollector
+class Maven31DependencyCollector implements MavenDependencyCollector
 {
     private final RepositorySystem repositorySystem;
 
     private final ArtifactHandlerManager artifactHandlerManager;
-    
+
     private final RepositorySystemSession session;
-    
+
     private final List<RemoteRepository> aetherRepositories;
-    
+
     Maven31DependencyCollector( RepositorySystem repositorySystem, ArtifactHandlerManager artifactHandlerManager,
-                                RepositorySystemSession session, List<RemoteRepository> aetherRepositories )
+            RepositorySystemSession session, List<RemoteRepository> aetherRepositories )
     {
         super();
         this.repositorySystem = repositorySystem;
@@ -67,13 +65,22 @@ class Maven31DependencyCollector
         this.aetherRepositories = aetherRepositories;
     }
 
+    private static Dependency toDependency( org.apache.maven.model.Dependency mavenDependency,
+            ArtifactTypeRegistry typeRegistry ) throws DependencyCollectorException
+    {
+        Class<?>[] argClasses = new Class<?>[] {org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class};
+
+        Object[] args = new Object[] {mavenDependency, typeRegistry};
+
+        return (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
+    }
+
     @Override
     public CollectorResult collectDependencies( org.apache.maven.model.Dependency root )
-        throws DependencyCollectorException
+            throws DependencyCollectorException
     {
-        ArtifactTypeRegistry typeRegistry =
-                        (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
-                                                               ArtifactHandlerManager.class, artifactHandlerManager );
+        ArtifactTypeRegistry typeRegistry = Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
+                ArtifactHandlerManager.class, artifactHandlerManager );
 
         CollectRequest request = new CollectRequest();
         request.setRoot( toDependency( root, typeRegistry ) );
@@ -82,42 +89,39 @@ class Maven31DependencyCollector
     }
 
     @Override
-    public CollectorResult collectDependencies( DependableCoordinate root )
-        throws DependencyCollectorException
+    public CollectorResult collectDependencies( DependableCoordinate root ) throws DependencyCollectorException
     {
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getType() );
-        
+
         String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
-        
+
         Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), root.getClassifier(),
-                                                       extension, root.getVersion() );
-        
+                extension, root.getVersion() );
+
         CollectRequest request = new CollectRequest();
         request.setRoot( new Dependency( aetherArtifact, null ) );
 
         return collectDependencies( request );
     }
-    
+
     @Override
-    public CollectorResult collectDependencies( Model root )
-        throws DependencyCollectorException
+    public CollectorResult collectDependencies( Model root ) throws DependencyCollectorException
     {
         // Are there examples where packaging and type are NOT in sync
         ArtifactHandler artifactHandler = artifactHandlerManager.getArtifactHandler( root.getPackaging() );
-        
+
         String extension = artifactHandler != null ? artifactHandler.getExtension() : null;
-        
-        Artifact aetherArtifact =
-            new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension, root.getVersion() );
-        
+
+        Artifact aetherArtifact = new DefaultArtifact( root.getGroupId(), root.getArtifactId(), extension,
+                root.getVersion() );
+
         CollectRequest request = new CollectRequest();
         request.setRoot( new Dependency( aetherArtifact, null ) );
-        
-        ArtifactTypeRegistry typeRegistry =
-                        (ArtifactTypeRegistry) Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
-                                                               ArtifactHandlerManager.class, artifactHandlerManager );
 
-        List<Dependency> aetherDependencies = new ArrayList<Dependency>( root.getDependencies().size() );
+        ArtifactTypeRegistry typeRegistry = Invoker.invoke( RepositoryUtils.class, "newArtifactTypeRegistry",
+                ArtifactHandlerManager.class, artifactHandlerManager );
+
+        List<Dependency> aetherDependencies = new ArrayList<>( root.getDependencies().size() );
         for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencies() )
         {
             aetherDependencies.add( toDependency( mavenDependency, typeRegistry ) );
@@ -126,22 +130,21 @@ class Maven31DependencyCollector
 
         if ( root.getDependencyManagement() != null )
         {
-            List<Dependency> aetherManagerDependencies =
-                new ArrayList<Dependency>( root.getDependencyManagement().getDependencies().size() );
-            
+            List<Dependency> aetherManagerDependencies = new ArrayList<>(
+                    root.getDependencyManagement().getDependencies().size() );
+
             for ( org.apache.maven.model.Dependency mavenDependency : root.getDependencyManagement().getDependencies() )
             {
                 aetherManagerDependencies.add( toDependency( mavenDependency, typeRegistry ) );
             }
-            
+
             request.setManagedDependencies( aetherManagerDependencies );
         }
 
         return collectDependencies( request );
     }
 
-    private CollectorResult collectDependencies( CollectRequest request )
-        throws DependencyCollectorException
+    private CollectorResult collectDependencies( CollectRequest request ) throws DependencyCollectorException
     {
         request.setRepositories( aetherRepositories );
 
@@ -154,14 +157,4 @@ class Maven31DependencyCollector
             throw new DependencyCollectorException( e.getMessage(), e );
         }
     }
-
-    private static Dependency toDependency( org.apache.maven.model.Dependency root, ArtifactTypeRegistry typeRegistry )
-                    throws DependencyCollectorException
-    {
-        Class<?>[] argClasses = new Class<?>[] { org.apache.maven.model.Dependency.class, ArtifactTypeRegistry.class };
-
-        Object[] args = new Object[] { root, typeRegistry };
-
-        return (Dependency) Invoker.invoke( RepositoryUtils.class, "toDependency", argClasses, args );
-    }
 }
diff --git a/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Invoker.java
index e20ea96..9055f14 100644
--- a/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Invoker.java
@@ -36,47 +36,13 @@ final class Invoker
     public static <T> T invoke( Object object, String method )
         throws DependencyResolverException
     {
-        return (T) invoke( object.getClass(), object, method );
-    }
-
-    public static <T> T invoke( Class<?> objectClazz, Object object, String method )
-        throws DependencyResolverException
-    {
-        try
-        {
-            return (T) objectClazz.getMethod( method ).invoke( object );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
-        }
-    }
-
-    public static Object invoke( Object object, String method, Class<?> argClazz, Object arg )
-        throws DependencyResolverException
-    {
         try
         {
-            final Class<?> objectClazz = object.getClass();
-            return objectClazz.getMethod( method, argClazz ).invoke( object, arg );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) object.getClass().getMethod( method ).invoke( object );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyResolverException( e.getMessage(), e );
         }
@@ -87,17 +53,11 @@ final class Invoker
     {
         try
         {
-            return (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClazz ).invoke( null, arg );
+            return invoke;
         }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
-        }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyResolverException( e.getMessage(), e );
         }
@@ -118,17 +78,11 @@ final class Invoker
     {
         try
         {
-            return (T) objectClazz.getMethod( staticMethod, argClasses ).invoke( null, args );
-        }
-        catch ( IllegalAccessException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
-        }
-        catch ( InvocationTargetException e )
-        {
-            throw new DependencyResolverException( e.getMessage(), e );
+            @SuppressWarnings( "unchecked" )
+            T invoke = (T) objectClazz.getMethod( staticMethod, argClasses ).invoke( null, args );
+            return invoke;
         }
-        catch ( NoSuchMethodException e )
+        catch ( IllegalAccessException | InvocationTargetException | NoSuchMethodException e )
         {
             throw new DependencyResolverException( e.getMessage(), e );
         }
diff --git a/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Maven30ArtifactResult.java b/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Maven30ArtifactResult.java
index 9ba5af8..b9f37d9 100644
--- a/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Maven30ArtifactResult.java
+++ b/src/main/java/org/apache/maven/shared/transfer/dependencies/resolve/internal/Maven30ArtifactResult.java
@@ -26,12 +26,11 @@ import org.sonatype.aether.resolution.ArtifactResult;
 
 /**
  * {@link org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult} wrapper for {@link ArtifactResult}
- * 
+ *
  * @author Robert Scholte
  * @since 3.0
  */
-class Maven30ArtifactResult
-    implements org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult
+class Maven30ArtifactResult implements org.apache.maven.shared.transfer.artifact.resolve.ArtifactResult
 {
     private final ArtifactResult artifactResult;
 
@@ -48,8 +47,7 @@ class Maven30ArtifactResult
     {
         try
         {
-            return Invoker.invoke( RepositoryUtils.class, "toArtifact",
-                                                                        Artifact.class, artifactResult.getArtifact() );
+            return Invoker.invoke( RepositoryUtils.class, "toArtifact", Artifact.class, artifactResult.getArtifact() );
         }
         catch ( DependencyResolverException e )
         {
diff --git a/src/main/java/org/apache/maven/shared/transfer/project/install/internal/DefaultProjectInstaller.java b/src/main/java/org/apache/maven/shared/transfer/project/install/internal/DefaultProjectInstaller.java
index dd6de0d..02ec826 100644
--- a/src/main/java/org/apache/maven/shared/transfer/project/install/internal/DefaultProjectInstaller.java
+++ b/src/main/java/org/apache/maven/shared/transfer/project/install/internal/DefaultProjectInstaller.java
@@ -149,10 +149,8 @@ class DefaultProjectInstaller
         }
     }
 
-    // CHECKSTYLE_OFF: LineLength
     private void addMetaDataFilesForArtifact( ProjectBuildingRequest buildingRequest, Artifact artifact,
-                                              Collection<File> targetMetadataFiles )
-    // CHECKSTYLE_ON: LineLength
+            Collection<File> targetMetadataFiles )
     {
         Collection<ArtifactMetadata> metadatas = artifact.getMetadataList();
         if ( metadatas != null )
diff --git a/src/main/java/org/apache/maven/shared/transfer/repository/internal/Invoker.java b/src/main/java/org/apache/maven/shared/transfer/repository/internal/Invoker.java
index 2da84bc..6f566e0 100644
--- a/src/main/java/org/apache/maven/shared/transfer/repository/internal/Invoker.java
+++ b/src/main/java/org/apache/maven/shared/transfer/repository/internal/Invoker.java
@@ -36,15 +36,9 @@ final class Invoker
     public static Object invoke( Object object, String method )
         throws RepositoryManagerException
     {
-        return invoke( object.getClass(), object, method );
-    }
-
-    public static Object invoke( Class<?> objectClazz, Object object, String method )
-        throws RepositoryManagerException
-    {
         try
         {
-            return objectClazz.getMethod( method ).invoke( object );
+            return object.getClass().getMethod( method ).invoke( object );
         }
         catch ( IllegalAccessException e )
         {