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https://issues.apache.org/jira/browse/MNG-7820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17760486#comment-17760486
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ASF GitHub Bot commented on MNG-7820:
-------------------------------------
CrazyHZM commented on code in PR #1208:
URL: https://github.com/apache/maven/pull/1208#discussion_r1310415877
##########
maven-core/src/main/java/org/apache/maven/utils/dag/DAG.java:
##########
@@ -0,0 +1,239 @@
+/*
+ * 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.utils.dag;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * DAG = Directed Acyclic Graph
+ *
+ * @author <a href="[email protected]">Michal Maczka</a>
+ *
+ * TODO this class should be renamed from DAG to Dag
+ */
+public class DAG implements Cloneable, Serializable {
+ // ------------------------------------------------------------
+ // Fields
+ // ------------------------------------------------------------
+ /**
+ * Nodes will be kept in two data structures at the same time for faster
processing
+ */
+ /**
+ * Maps vertex's label to vertex
+ */
+ private Map<String, Vertex> vertexMap = new HashMap<>();
+
+ /**
+ * Conatin list of all vertices
+ */
+ private List<Vertex> vertexList = new ArrayList<>();
+
+ // ------------------------------------------------------------
+ // Constructors
+ // ------------------------------------------------------------
+
+ /**
+ *
+ */
+ public DAG() {
+ super();
+ }
+
+ // ------------------------------------------------------------
+ // Accessors
+ // ------------------------------------------------------------
+
+ /**
+ * @return the vertices
+ */
+ public List<Vertex> getVertices() {
+ return vertexList;
+ }
+
+ /**
+ * @deprecated instead use {@link #getVertices()}
+ * @return the vertices
+ */
+ @Deprecated
+ public List<Vertex> getVerticies() {
+ return getVertices();
+ }
+
+ public Set<String> getLabels() {
+ return vertexMap.keySet();
+ }
+
+ // ------------------------------------------------------------
+ // Implementation
+ // ------------------------------------------------------------
+
+ /**
+ * Adds vertex to DAG. If vertex of given label already exist in DAG no
vertex is added
+ *
+ * @param label The label of the Vertex
+ * @return New vertex if vertex of given label was not present in the DAG
or existing vertex if vertex of given
+ * label was already added to DAG
+ */
+ public Vertex addVertex(final String label) {
+ Vertex retValue = null;
+
+ // check if vertex is already in DAG
+ if (vertexMap.containsKey(label)) {
+ retValue = vertexMap.get(label);
+ } else {
+ retValue = new Vertex(label);
+
+ vertexMap.put(label, retValue);
+
+ vertexList.add(retValue);
+ }
+
+ return retValue;
+ }
+
+ public void addEdge(final String from, final String to) throws
CycleDetectedException {
+ final Vertex v1 = addVertex(from);
+
+ final Vertex v2 = addVertex(to);
+
+ addEdge(v1, v2);
+ }
+
+ public void addEdge(final Vertex from, final Vertex to) throws
CycleDetectedException {
+
+ from.addEdgeTo(to);
+
+ to.addEdgeFrom(from);
+
+ final List<String> cycle = CycleDetector.introducesCycle(to);
+
+ if (cycle != null) {
+ // remove edge which introduced cycle
+
+ removeEdge(from, to);
+
+ final String msg = "Edge between '" + from + "' and '" + to + "'
introduces to cycle in the graph";
+
+ throw new CycleDetectedException(msg, cycle);
+ }
+ }
+
+ public void removeEdge(final String from, final String to) {
+ final Vertex v1 = addVertex(from);
+
+ final Vertex v2 = addVertex(to);
+
+ removeEdge(v1, v2);
+ }
+
+ public void removeEdge(final Vertex from, final Vertex to) {
+ from.removeEdgeTo(to);
+
+ to.removeEdgeFrom(from);
+ }
+
+ public Vertex getVertex(final String label) {
+ final Vertex retValue = vertexMap.get(label);
+
+ return retValue;
+ }
+
+ public boolean hasEdge(final String label1, final String label2) {
+ final Vertex v1 = getVertex(label1);
+
+ final Vertex v2 = getVertex(label2);
+
+ final boolean retValue = v1.getChildren().contains(v2);
+
+ return retValue;
+ }
+
+ /**
+ * @param label see name
+ * @return the childs
+ */
+ public List<String> getChildLabels(final String label) {
+ final Vertex vertex = getVertex(label);
+
+ return vertex.getChildLabels();
+ }
+
+ /**
+ * @param label see name
+ * @return the parents
+ */
+ public List<String> getParentLabels(final String label) {
+ final Vertex vertex = getVertex(label);
+
+ return vertex.getParentLabels();
+ }
+
+ /**
+ * @see java.lang.Object#clone()
+ */
+ @Override
+ public Object clone() throws CloneNotSupportedException {
+ // this is what's failing..
+ final Object retValue = super.clone();
+
+ return retValue;
+ }
+
+ /**
+ * Indicates if there is at least one edge leading to or from vertex of
given label
+ * @param label the label
+ * @return <code>true</code> if this vertex is connected with other
vertex,<code>false</code> otherwise
+ */
+ public boolean isConnected(final String label) {
+ final Vertex vertex = getVertex(label);
+
+ final boolean retValue = vertex.isConnected();
+
+ return retValue;
+ }
+
+ /**
+ * Return the list of labels of successor in order decided by topological
sort
+ *
+ * @param label The label of the vertex whose predecessors are searched
+ * @return The list of labels. Returned list contains also the label
passed as parameter to this method. This label
Review Comment:
@elharo
Is the "The" missing in front of the labels?
> Remove dependency on plexus-utils
> ---------------------------------
>
> Key: MNG-7820
> URL: https://issues.apache.org/jira/browse/MNG-7820
> Project: Maven
> Issue Type: Task
> Reporter: Guillaume Nodet
> Priority: Major
> Fix For: 4.0.0-alpha-8
>
>
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