cstamas commented on a change in pull request #650:
URL: https://github.com/apache/maven/pull/650#discussion_r780109529



##########
File path: 
maven-core/src/main/java/org/apache/maven/lifecycle/providers/CleanLifecycleProvider.java
##########
@@ -19,45 +19,33 @@
  * under the License.
  */
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
-
 import javax.inject.Inject;
 import javax.inject.Named;
-import javax.inject.Provider;
 import javax.inject.Singleton;
 
-import org.apache.maven.lifecycle.Lifecycle;
-import org.apache.maven.lifecycle.mapping.LifecyclePhase;
-
+/**
+ * {@code clean} lifecycle provider.
+ */
 @Named( "clean" )

Review comment:
       shlould be `CleanLifecycleProvider.LIFECYCLE_ID`

##########
File path: 
maven-core/src/main/java/org/apache/maven/lifecycle/providers/CleanLifecycleProvider.java
##########
@@ -19,45 +19,33 @@
  * under the License.
  */
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
-
 import javax.inject.Inject;
 import javax.inject.Named;
-import javax.inject.Provider;
 import javax.inject.Singleton;
 
-import org.apache.maven.lifecycle.Lifecycle;
-import org.apache.maven.lifecycle.mapping.LifecyclePhase;
-
+/**
+ * {@code clean} lifecycle provider.
+ */
 @Named( "clean" )

Review comment:
       Same for other 2

##########
File path: 
maven-core/src/main/java/org/apache/maven/lifecycle/providers/AbstractLifecycleProvider.java
##########
@@ -0,0 +1,71 @@
+package org.apache.maven.lifecycle.providers;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+
+import javax.inject.Provider;
+
+import org.apache.maven.lifecycle.Lifecycle;
+import org.apache.maven.lifecycle.mapping.LifecyclePhase;
+
+/**
+ * Base lifecycle provider.
+ */
+public abstract class AbstractLifecycleProvider
+    implements Provider<Lifecycle>
+{
+    private final Lifecycle lifecycle;
+
+    protected AbstractLifecycleProvider( String id, String[] phases, String[] 
pluginBindings )
+    {
+        HashMap<String, LifecyclePhase> defaultBindings = null;
+        if ( pluginBindings != null )
+        {
+            final int len = pluginBindings.length;
+
+            if ( len < 1 || len % 2 != 0 )

Review comment:
       make it `len < 2`

##########
File path: 
maven-core/src/main/java/org/apache/maven/lifecycle/providers/CleanLifecycleProvider.java
##########
@@ -19,45 +19,33 @@
  * under the License.
  */
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.HashMap;
-
 import javax.inject.Inject;
 import javax.inject.Named;
-import javax.inject.Provider;
 import javax.inject.Singleton;
 
-import org.apache.maven.lifecycle.Lifecycle;
-import org.apache.maven.lifecycle.mapping.LifecyclePhase;
-
+/**
+ * {@code clean} lifecycle provider.
+ */
 @Named( "clean" )
 @Singleton
 public final class CleanLifecycleProvider
-    implements Provider<Lifecycle>
+    extends AbstractLifecycleProvider
 {
-  private final Lifecycle lifecycle;
+    private static final String LIFECYCLE_ID = "clean";
 
-  @Inject
-  public CleanLifecycleProvider()
-  {
-    HashMap<String, LifecyclePhase> phases = new HashMap<>();
-    phases.put( "clean", new LifecyclePhase( 
"org.apache.maven.plugins:maven-clean-plugin:3.1.0:clean" ) );
-
-    this.lifecycle = new Lifecycle(
+    private static final String[] PHASES = {
+        "pre-clean",
         "clean",
-        Collections.unmodifiableList( Arrays.asList(
-                "pre-clean",
-                "clean",
-                "post-clean"
-        ) ),
-        Collections.unmodifiableMap( phases )
-    );
-  }
-
-  @Override
-  public Lifecycle get()
-  {
-    return lifecycle;
-  }
+        "post-clean"
+    };
+
+    private static final String[] BINDINGS = {
+        "clean", "org.apache.maven.plugins:maven-clean-plugin:3.1.0:clean"
+    };
+
+    @Inject
+    public CleanLifecycleProvider()
+    {

Review comment:
       Is explicit IMHO, also does not stirs anything (present or not present), 
so IMHO is okay.




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