[MNG-8084] Make the v4 api usable outside the Maven runtime

api/maven-api-core/src/main/java/org/apache/maven/api/services/PathSource.java

@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+package org.apache.maven.api.services;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+class PathSource implements Source {
+
+    private final Path path;
+
+    PathSource(Path path) {
+        this.path = path;
+    }
+
+    @Override
+    public Path getPath() {
+        return path;
+    }
+
+    @Override
+    public InputStream openStream() throws IOException {
+        return Files.newInputStream(path);
+    }
+
+    @Override
+    public String getLocation() {
+        return path.toString();
+    }
+
+    @Override
+    public Source resolve(String relative) {
+        return new PathSource(path.resolve(relative));
+    }
+}

api/maven-api-core/src/main/java/org/apache/maven/api/services/SettingsBuilder.java

@@ -19,11 +19,13 @@
 package org.apache.maven.api.services;
 
 import java.nio.file.Path;
+import java.util.List;
 
 import org.apache.maven.api.Service;
 import org.apache.maven.api.Session;
 import org.apache.maven.api.annotations.Experimental;
 import org.apache.maven.api.annotations.Nonnull;
+import org.apache.maven.api.settings.Settings;
 
 /**
  * Builds the effective settings from a user settings file and/or a global settings file.
@@ -97,4 +99,37 @@ default SettingsBuilderResult build(
             @Nonnull Path userSettingsPath) {
         return build(SettingsBuilderRequest.build(session, globalSettingsPath, projectSettingsPath, userSettingsPath));
     }
+
+    /**
+     * Validate the specified settings.
+     *
+     * @param settings The settings to validate, must not be {@code null}.
+     * @return The list of problems that were encountered, must not be {@code null}.
+     */
+    @Nonnull
+    default List<BuilderProblem> validate(@Nonnull Settings settings) {
+        return validate(settings, false);
+    }
+
+    /**
+     * Validate the specified settings.
+     *
+     * @param settings The settings to validate, must not be {@code null}.
+     * @param isProjectSettings Boolean indicating if the validation is for project settings or user / global settings.
+     * @return The list of problems that were encountered, must not be {@code null}.
+     */
+    @Nonnull
+    List<BuilderProblem> validate(@Nonnull Settings settings, boolean isProjectSettings);
+
+    /**
+     * Convert a model profile to a settings profile.
+     */
+    @Nonnull
+    org.apache.maven.api.settings.Profile convert(@Nonnull org.apache.maven.api.model.Profile profile);
+
+    /**
+     * Convert a settings profile to a model profile.
+     */
+    @Nonnull
+    org.apache.maven.api.model.Profile convert(@Nonnull org.apache.maven.api.settings.Profile profile);
 }

api/maven-api-core/src/main/java/org/apache/maven/api/services/SettingsBuilderException.java

@@ -18,6 +18,9 @@
  */
 package org.apache.maven.api.services;
 
+import java.util.List;
+import java.util.stream.Collectors;
+
 import org.apache.maven.api.annotations.Experimental;
 
 /**
@@ -27,13 +30,24 @@
  */
 @Experimental
 public class SettingsBuilderException extends MavenException {
+
+    private final List<BuilderProblem> problems;
+
     /**
      * @param message the message to give
      * @param e the {@link Exception}
      */
     public SettingsBuilderException(String message, Exception e) {
         super(message, e);
+        this.problems = List.of();
     }
 
-    // TODO: add SettingsBuilderResult
+    public SettingsBuilderException(String message, List<BuilderProblem> problems) {
+        super(message + ": " + problems.stream().map(BuilderProblem::toString).collect(Collectors.joining(", ")), null);
+        this.problems = List.copyOf(problems);
+    }
+
+    public List<BuilderProblem> getProblems() {
+        return problems;
+    }
 }

api/maven-api-core/src/main/java/org/apache/maven/api/services/SettingsBuilderRequest.java

@@ -18,6 +18,7 @@
  */
 package org.apache.maven.api.services;
 
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Optional;
 
@@ -40,14 +41,6 @@ public interface SettingsBuilderRequest {
     @Nonnull
     Session getSession();
 
-    /**
-     * Gets the global settings path.
-     *
-     * @return the global settings path or {@code null} if none
-     */
-    @Nonnull
-    Optional<Path> getGlobalSettingsPath();
-
     /**
      * Gets the global settings source.
      *
@@ -64,22 +57,6 @@ public interface SettingsBuilderRequest {
     @Nonnull
     Optional<Source> getProjectSettingsSource();
 
-    /**
-     * Gets the project settings path.
-     *
-     * @return the project settings path or {@code null} if none
-     */
-    @Nonnull
-    Optional<Path> getProjectSettingsPath();
-
-    /**
-     * Gets the user settings path.
-     *
-     * @return the user settings path or {@code null} if none
-     */
-    @Nonnull
-    Optional<Path> getUserSettingsPath();
-
     /**
      * Gets the user settings source.
      *
@@ -97,34 +74,43 @@ static SettingsBuilderRequest build(
     @Nonnull
     static SettingsBuilderRequest build(
             @Nonnull Session session, @Nonnull Path globalSettingsPath, @Nonnull Path userSettingsPath) {
-        return build(session, globalSettingsPath, null, userSettingsPath);
+        return build(session, Source.fromPath(globalSettingsPath), null, Source.fromPath(userSettingsPath));
     }
 
     @Nonnull
     static SettingsBuilderRequest build(
             @Nonnull Session session,
-            @Nonnull Source globalSettingsSource,
-            @Nonnull Source projectSettingsSource,
-            @Nonnull Source userSettingsSource) {
+            @Nullable Source globalSettingsSource,
+            @Nullable Source projectSettingsSource,
+            @Nullable Source userSettingsSource) {
         return builder()
                 .session(nonNull(session, "session cannot be null"))
-                .globalSettingsSource(nonNull(globalSettingsSource, "globalSettingsSource cannot be null"))
-                .projectSettingsSource(nonNull(projectSettingsSource, "projectSettingsSource cannot be null"))
-                .userSettingsSource(nonNull(userSettingsSource, "userSettingsSource cannot be null"))
+                .globalSettingsSource(globalSettingsSource)
+                .projectSettingsSource(projectSettingsSource)
+                .userSettingsSource(userSettingsSource)
                 .build();
     }
 
     @Nonnull
     static SettingsBuilderRequest build(
             @Nonnull Session session,
-            @Nonnull Path globalSettingsPath,
-            @Nonnull Path projectSettingsPath,
-            @Nonnull Path userSettingsPath) {
+            @Nullable Path globalSettingsPath,
+            @Nullable Path projectSettingsPath,
+            @Nullable Path userSettingsPath) {
         return builder()
                 .session(nonNull(session, "session cannot be null"))
-                .globalSettingsPath(nonNull(globalSettingsPath, "globalSettingsPath cannot be null"))
-                .projectSettingsPath(nonNull(projectSettingsPath, "projectSettingsPath cannot be null"))
-                .userSettingsPath(nonNull(userSettingsPath, "userSettingsPath cannot be null"))
+                .globalSettingsSource(
+                        globalSettingsPath != null && Files.exists(globalSettingsPath)
+                                ? Source.fromPath(globalSettingsPath)
+                                : null)
+                .projectSettingsSource(
+                        projectSettingsPath != null && Files.exists(projectSettingsPath)
+                                ? Source.fromPath(projectSettingsPath)
+                                : null)
+                .userSettingsSource(
+                        userSettingsPath != null && Files.exists(userSettingsPath)
+                                ? Source.fromPath(userSettingsPath)
+                                : null)
                 .build();
     }
 
@@ -136,115 +122,64 @@ static SettingsBuilderRequestBuilder builder() {
     @NotThreadSafe
     class SettingsBuilderRequestBuilder {
         Session session;
-        Path globalSettingsPath;
         Source globalSettingsSource;
-        Path projectSettingsPath;
         Source projectSettingsSource;
-        Path userSettingsPath;
         Source userSettingsSource;
 
         public SettingsBuilderRequestBuilder session(Session session) {
             this.session = session;
             return this;
         }
 
-        public SettingsBuilderRequestBuilder globalSettingsPath(Path globalSettingsPath) {
-            this.globalSettingsPath = globalSettingsPath;
-            return this;
-        }
-
         public SettingsBuilderRequestBuilder globalSettingsSource(Source globalSettingsSource) {
             this.globalSettingsSource = globalSettingsSource;
             return this;
         }
 
-        public SettingsBuilderRequestBuilder projectSettingsPath(Path projectSettingsPath) {
-            this.projectSettingsPath = projectSettingsPath;
-            return this;
-        }
-
         public SettingsBuilderRequestBuilder projectSettingsSource(Source projectSettingsSource) {
             this.projectSettingsSource = projectSettingsSource;
             return this;
         }
 
-        public SettingsBuilderRequestBuilder userSettingsPath(Path userSettingsPath) {
-            this.userSettingsPath = userSettingsPath;
-            return this;
-        }
-
         public SettingsBuilderRequestBuilder userSettingsSource(Source userSettingsSource) {
             this.userSettingsSource = userSettingsSource;
             return this;
         }
 
         public SettingsBuilderRequest build() {
             return new DefaultSettingsBuilderRequest(
-                    session,
-                    globalSettingsPath,
-                    globalSettingsSource,
-                    projectSettingsPath,
-                    projectSettingsSource,
-                    userSettingsPath,
-                    userSettingsSource);
+                    session, globalSettingsSource, projectSettingsSource, userSettingsSource);
         }
 
         private static class DefaultSettingsBuilderRequest extends BaseRequest implements SettingsBuilderRequest {
-            private final Path globalSettingsPath;
             private final Source globalSettingsSource;
-            private final Path projectSettingsPath;
             private final Source projectSettingsSource;
-            private final Path userSettingsPath;
             private final Source userSettingsSource;
 
             @SuppressWarnings("checkstyle:ParameterNumber")
             DefaultSettingsBuilderRequest(
                     @Nonnull Session session,
-                    @Nullable Path globalSettingsPath,
                     @Nullable Source globalSettingsSource,
-                    @Nullable Path projectSettingsPath,
                     @Nullable Source projectSettingsSource,
-                    @Nullable Path userSettingsPath,
                     @Nullable Source userSettingsSource) {
                 super(session);
-                this.globalSettingsPath = globalSettingsPath;
                 this.globalSettingsSource = globalSettingsSource;
-                this.projectSettingsPath = projectSettingsPath;
                 this.projectSettingsSource = projectSettingsSource;
-                this.userSettingsPath = userSettingsPath;
                 this.userSettingsSource = userSettingsSource;
             }
 
-            @Nonnull
-            @Override
-            public Optional<Path> getGlobalSettingsPath() {
-                return Optional.ofNullable(globalSettingsPath);
-            }
-
             @Nonnull
             @Override
             public Optional<Source> getGlobalSettingsSource() {
                 return Optional.ofNullable(globalSettingsSource);
             }
 
-            @Nonnull
-            @Override
-            public Optional<Path> getProjectSettingsPath() {
-                return Optional.ofNullable(projectSettingsPath);
-            }
-
             @Nonnull
             @Override
             public Optional<Source> getProjectSettingsSource() {
                 return Optional.ofNullable(projectSettingsSource);
             }
 
-            @Nonnull
-            @Override
-            public Optional<Path> getUserSettingsPath() {
-                return Optional.ofNullable(userSettingsPath);
-            }
-
             @Nonnull
             @Override
             public Optional<Source> getUserSettingsSource() {

api/maven-api-core/src/main/java/org/apache/maven/api/services/Source.java

@@ -27,6 +27,8 @@
 import org.apache.maven.api.annotations.Nonnull;
 import org.apache.maven.api.annotations.Nullable;
 
+import static org.apache.maven.api.services.BaseRequest.nonNull;
+
 /**
  * Provides access to the contents of a source independently of the
  * backing store (e.g. file system, database, memory).
@@ -86,4 +88,12 @@ public interface Source {
      * @return related source or <code>null</code> if no such source
      */
     Source resolve(String relative);
+
+    /**
+     * Creates a Source for the following Path
+     */
+    @Nonnull
+    static Source fromPath(@Nonnull Path path) {
+        return new PathSource(nonNull(path, "path cannot be null"));
+    }
 }