Add unmodified DefaultProjectDependencyGraph from maven 3.8.2

daemon/src/main/java/org/apache/maven/graph/DefaultProjectDependencyGraph.java

@@ -0,0 +1,161 @@
+package org.apache.maven.graph;
+
+/*
+ * 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.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+import org.apache.maven.execution.ProjectDependencyGraph;
+import org.apache.maven.project.DuplicateProjectException;
+import org.apache.maven.project.MavenProject;
+import org.apache.maven.project.ProjectSorter;
+import org.codehaus.plexus.util.dag.CycleDetectedException;
+
+/**
+ * Describes the inter-dependencies between projects in the reactor.
+ *
+ * @author Benjamin Bentmann
+ */
+public class DefaultProjectDependencyGraph
+        implements ProjectDependencyGraph
+{
+
+    private ProjectSorter sorter;
+
+    private List<MavenProject> allProjects;
+
+    /**
+     * Creates a new project dependency graph based on the specified projects.
+     *
+     * @param projects The projects to create the dependency graph with
+     * @throws DuplicateProjectException
+     * @throws CycleDetectedException
+     */
+    public DefaultProjectDependencyGraph( Collection<MavenProject> projects )
+            throws CycleDetectedException, DuplicateProjectException
+    {
+        super();
+        this.allProjects = Collections.unmodifiableList( new ArrayList<>( projects ) );
+        this.sorter = new ProjectSorter( projects );
+    }
+
+    /**
+     * Creates a new project dependency graph based on the specified projects.
+     *
+     * @param allProjects All collected projects.
+     * @param projects The projects to create the dependency graph with.
+     *
+     * @throws DuplicateProjectException
+     * @throws CycleDetectedException
+     * @since 3.5.0
+     */
+    public DefaultProjectDependencyGraph( final List<MavenProject> allProjects,
+                                          final Collection<MavenProject> projects )
+            throws CycleDetectedException, DuplicateProjectException
+    {
+        super();
+        this.allProjects = Collections.unmodifiableList( new ArrayList<>( allProjects ) );
+        this.sorter = new ProjectSorter( projects );
+    }
+
+    /**
+     * @since 3.5.0
+     */
+    public List<MavenProject> getAllProjects()
+    {
+        return this.allProjects;
+    }
+
+    public List<MavenProject> getSortedProjects()
+    {
+        return new ArrayList<>( sorter.getSortedProjects() );
+    }
+
+    public List<MavenProject> getDownstreamProjects( MavenProject project, boolean transitive )
+    {
+        Objects.requireNonNull( project, "project cannot be null" );
+
+        Set<String> projectIds = new HashSet<>();
+
+        getDownstreamProjects( ProjectSorter.getId( project ), projectIds, transitive );
+
+        return getSortedProjects( projectIds );
+    }
+
+    private void getDownstreamProjects( String projectId, Set<String> projectIds, boolean transitive )
+    {
+        for ( String id : sorter.getDependents( projectId ) )
+        {
+            if ( projectIds.add( id ) && transitive )
+            {
+                getDownstreamProjects( id, projectIds, transitive );
+            }
+        }
+    }
+
+    public List<MavenProject> getUpstreamProjects( MavenProject project, boolean transitive )
+    {
+        Objects.requireNonNull( project, "project cannot be null" );
+
+        Set<String> projectIds = new HashSet<>();
+
+        getUpstreamProjects( ProjectSorter.getId( project ), projectIds, transitive );
+
+        return getSortedProjects( projectIds );
+    }
+
+    private void getUpstreamProjects( String projectId, Collection<String> projectIds, boolean transitive )
+    {
+        for ( String id : sorter.getDependencies( projectId ) )
+        {
+            if ( projectIds.add( id ) && transitive )
+            {
+                getUpstreamProjects( id, projectIds, transitive );
+            }
+        }
+    }
+
+    private List<MavenProject> getSortedProjects( Set<String> projectIds )
+    {
+        List<MavenProject> result = new ArrayList<>( projectIds.size() );
+
+        for ( MavenProject mavenProject : sorter.getSortedProjects() )
+        {
+            if ( projectIds.contains( ProjectSorter.getId( mavenProject ) ) )
+            {
+                result.add( mavenProject );
+            }
+        }
+
+        return result;
+    }
+
+    @Override
+    public String toString()
+    {
+        return sorter.getSortedProjects().toString();
+    }
+
+}