[MNG-7553] New clean API with immutable model

apache-maven/src/test/java/org/apache/maven/settings/GlobalSettingsTest.java

@@ -25,7 +25,7 @@
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
 
-import org.apache.maven.settings.io.xpp3.SettingsXpp3Reader;
+import org.apache.maven.settings.v4.SettingsXpp3Reader;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;

api/maven-api-core/pom.xml

@@ -0,0 +1,55 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<!--
+  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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.apache.maven</groupId>
+    <artifactId>maven-api</artifactId>
+    <version>4.0.0-alpha-1-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>maven-api-core</artifactId>
+  <name>Apache Maven Core API</name>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-api-meta</artifactId>
+      <version>4.0.0-alpha-1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-api-model</artifactId>
+      <version>4.0.0-alpha-1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-api-settings</artifactId>
+      <version>4.0.0-alpha-1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.maven</groupId>
+      <artifactId>maven-api-toolchain</artifactId>
+      <version>4.0.0-alpha-1-SNAPSHOT</version>
+    </dependency>
+  </dependencies>
+
+</project>

api/maven-api-core/src/main/java/org/apache/maven/api/Artifact.java

@@ -0,0 +1,113 @@
+package org.apache.maven.api;
+
+/*
+ * 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 org.apache.maven.api.annotations.Nonnull;
+import org.apache.maven.api.annotations.Immutable;
+
+import java.nio.file.Path;
+import java.util.Optional;
+
+/**
+ * TODO: split between Coordinates / AttachedArtifact / ResolvedArtifact
+ */
+@Immutable
+public interface Artifact
+{
+
+    /**
+     * The groupId of the artifact.
+     *
+     * @return The groupId.
+     */
+    @Nonnull
+    String getGroupId();
+
+    /**
+     * The artifactId of the artifact.
+     *
+     * @return The artifactId.
+     */
+    @Nonnull
+    String getArtifactId();
+
+    /**
+     * The classifier of the artifact.
+     *
+     * @return The classifier or an empty string if none, never {@code null}.
+     */
+    @Nonnull
+    String getClassifier();
+
+    /**
+     * The version of the artifact.
+     *
+     * @return The version.
+     */
+    @Nonnull
+    String getVersion();
+
+    /**
+     * The file extension of the artifact.
+     *
+     * @return The extension.
+     */
+    @Nonnull
+    String getExtension();
+
+    /**
+     * Gets the base version of this artifact, for example "1.0-SNAPSHOT". In contrast to the {@link #getVersion()}, the
+     * base version will always refer to the unresolved version.
+     *
+     * @return The base version, never {@code null}.
+     */
+    @Nonnull
+    String getBaseVersion();
+
+    /**
+     * Determines whether this artifact uses a snapshot version.
+     *
+     * @return {@code true} if the artifact is a snapshot, {@code false} otherwise.
+     * @see org.apache.maven.api.Session#isVersionSnapshot(String)
+     */
+    boolean isSnapshot();
+
+    /**
+     * Gets the file of this artifact. Note that only resolved artifacts have a file associated with them. In general,
+     * callers must not assume any relationship between an artifact's filename and its coordinates.
+     *
+     * @return The file or {@link Optional#empty()} if the artifact isn't resolved.
+     */
+    @Nonnull
+    Optional<Path> getPath();
+
+    /**
+     * Unique id identifying this artifact
+     */
+    default String getId()
+    {
+        return getGroupId()
+                + ":" + getArtifactId()
+                + ":" + getExtension()
+                + ( getClassifier().isEmpty() ? "" : ":" + getClassifier() )
+                + ":" + getBaseVersion();
+    }
+
+}

api/maven-api-core/src/main/java/org/apache/maven/api/Dependency.java

@@ -0,0 +1,75 @@
+package org.apache.maven.api;
+
+/*
+ * 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 org.apache.maven.api.annotations.Nonnull;
+import org.apache.maven.api.annotations.Nullable;
+import org.apache.maven.api.annotations.Immutable;
+
+import java.util.Collection;
+
+@Immutable
+public interface Dependency
+{
+    @Nonnull
+    Artifact getArtifact();
+
+    // TODO: make that en enum ?
+    @Nonnull
+    String getScope();
+
+    @Nullable
+    Boolean getOptional();
+
+    @Nonnull
+    Collection<Exclusion> getExclusions();
+
+    @Nonnull
+    default String getGroupId()
+    {
+        return getArtifact().getGroupId();
+    }
+
+    @Nonnull
+    default String getArtifactId()
+    {
+        return getArtifact().getArtifactId();
+    }
+
+    @Nonnull
+    default String getVersion()
+    {
+        return getArtifact().getVersion();
+    }
+
+    @Nonnull
+    default String getType()
+    {
+        // TODO
+        throw new UnsupportedOperationException( "Not implemented yet" );
+    }
+
+    @Nonnull
+    default String getClassifier()
+    {
+        return getArtifact().getClassifier();
+    }
+
+}

api/maven-api-core/src/main/java/org/apache/maven/api/Event.java

@@ -0,0 +1,95 @@
+package org.apache.maven.api;
+
+/*
+ * 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 org.apache.maven.api.annotations.Nonnull;
+
+import java.util.Optional;
+
+/**
+ * Event
+ */
+public interface Event
+{
+
+    /**
+     * The possible types of execution events.
+     */
+    enum Type
+    {
+        ProjectDiscoveryStarted,
+        SessionStarted,
+        SessionEnded,
+        ProjectSkipped,
+        ProjectStarted,
+        ProjectSucceeded,
+        ProjectFailed,
+        MojoSkipped,
+        MojoStarted,
+        MojoSucceeded,
+        MojoFailed,
+        ForkStarted,
+        ForkSucceeded,
+        ForkFailed,
+        ForkedProjectStarted,
+        ForkedProjectSucceeded,
+        ForkedProjectFailed,
+    }
+
+    /**
+     * Gets the type of the event.
+     *
+     * @return The type of the event, never {@code null}.
+     */
+    @Nonnull
+    Type getType();
+
+    /**
+     * Gets the session from which this event originates.
+     *
+     * @return The current session, never {@code null}.
+     */
+    @Nonnull
+    Session getSession();
+
+    /**
+     * Gets the current project (if any).
+     *
+     * @return The current project or {@code empty()} if not applicable.
+     */
+    @Nonnull
+    Optional<Project> getProject();
+
+    /**
+     * Gets the current mojo execution (if any).
+     *
+     * @return The current mojo execution or {@code empty()} if not applicable.
+     */
+    @Nonnull
+    Optional<MojoExecution> getMojoExecution();
+
+    /**
+     * Gets the exception that caused the event (if any).
+     *
+     * @return The exception or {@code empty()} if none.
+     */
+    Optional<Exception> getException();
+
+}

api/maven-api-core/src/main/java/org/apache/maven/api/Exclusion.java

@@ -0,0 +1,32 @@
+package org.apache.maven.api;
+
+/*
+ * 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 org.apache.maven.api.annotations.Nullable;
+
+public interface Exclusion
+{
+    @Nullable
+    String getGroupId();
+
+    @Nullable
+    String getArtifactId();
+
+}