[MNG-7553] New clean API with immutable model

apache-maven/src/assembly/maven/bin/m2.conf

@@ -7,4 +7,5 @@ load       ${maven.conf}/logging
 optionally ${maven.home}/lib/ext/redisson/*.jar
 optionally ${maven.home}/lib/ext/hazelcast/*.jar
 optionally ${maven.home}/lib/ext/*.jar
+load       ${maven.home}/lib/maven-*.jar
 load       ${maven.home}/lib/*.jar

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 +1,107 @@
+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.Experimental;
+import org.apache.maven.api.annotations.Immutable;
+import org.apache.maven.api.annotations.Nonnull;
+
+/**
+ * An artifact points to a resource such as a jar file or war application.
+ *
+ * @since 4.0
+ */
+@Experimental
+@Immutable
+public interface Artifact
+{
+
+    /**
+     * Returns a unique identifier for this artifact.
+     * The identifier is composed of groupId, artifactId, version, classifier, extension
+     * @return the unique identifier
+     */
+    default String key()
+    {
+        return getGroupId()
+                + ':' + getArtifactId()
+                + ':' + getExtension()
+                + ( getClassifier().length() > 0 ? ":" + getClassifier() : "" )
+                + ':' + getVersion();
+    }
+
+    /**
+     * The groupId of the artifact.
+     *
+     * @return The groupId.
+     */
+    @Nonnull
+    String getGroupId();
+
+    /**
+     * The artifactId of the artifact.
+     *
+     * @return The artifactId.
+     */
+    @Nonnull
+    String getArtifactId();
+
+    /**
+     * The version of the artifact.
+     *
+     * @return The version.
+     */
+    @Nonnull
+    Version getVersion();
+
+    /**
+     * The classifier of the artifact.
+     *
+     * @return The classifier or an empty string if none, never {@code null}.
+     */
+    @Nonnull
+    String getClassifier();
+
+    /**
+     * The file extension of the artifact.
+     *
+     * @return The extension.
+     */
+    @Nonnull
+    String getExtension();
+
+    /**
+     * 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();
+
+    /**
+     * Shortcut for {@code session.createArtifactCoordinate(artifact)}
+     *
+     * @return an {@link ArtifactCoordinate}
+     * @see org.apache.maven.api.Session#createArtifactCoordinate(Artifact)
+     */
+    @Nonnull
+    ArtifactCoordinate toCoordinate();
+
+}

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

@@ -0,0 +1,89 @@
+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.Experimental;
+import org.apache.maven.api.annotations.Immutable;
+import org.apache.maven.api.annotations.Nonnull;
+
+/**
+ * The {@code Coordinate} object is used to point to an {@link Artifact}
+ * but the version may be specified as a range instead of an exact version.
+ *
+ * @since 4.0
+ */
+@Experimental
+@Immutable
+public interface ArtifactCoordinate
+{
+
+    /**
+     * 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
+    VersionRange getVersion();
+
+    /**
+     * The extension of the artifact.
+     *
+     * @return The extension or an empty string if none, never {@code null}.
+     */
+    @Nonnull
+    String getExtension();
+
+    /**
+     * Unique id identifying this artifact
+     */
+    default String getId()
+    {
+        return getGroupId()
+                + ":" + getArtifactId()
+                + ":" + getExtension()
+                + ( getClassifier().isEmpty() ? "" : ":" + getClassifier() )
+                + ":" + getVersion();
+    }
+
+}

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

@@ -0,0 +1,48 @@
+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;
+
+public interface Dependency extends Artifact
+{
+
+    /**
+     * The artifact type.
+     *
+     * @return The artifact type, never {@code null}.
+     */
+    @Nonnull
+    Type getType();
+
+    Scope getScope();
+
+    boolean isOptional();
+
+    /**
+     * Shortcut for {@code session.createDependencyCoordinate(dependency)}
+     *
+     * @return an {@link DependencyCoordinate}
+     * @see org.apache.maven.api.Session#createDependencyCoordinate(Dependency)
+     */
+    @Nonnull
+    DependencyCoordinate toCoordinate();
+
+}

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

@@ -0,0 +1,54 @@
+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.Experimental;
+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;
+
+/**
+ *
+ * @since 4.0
+ */
+@Experimental
+@Immutable
+public interface DependencyCoordinate extends ArtifactCoordinate
+{
+    /**
+     * The type of the artifact.
+     *
+     * @return The type.
+     */
+    @Nonnull
+    Type getType();
+
+    @Nonnull
+    Scope getScope();
+
+    @Nullable
+    Boolean getOptional();
+
+    @Nonnull
+    Collection<Exclusion> getExclusions();
+
+}