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https://issues.apache.org/jira/browse/MDEP-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17847939#comment-17847939
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ASF GitHub Bot commented on MDEP-799:
-------------------------------------
LogFlames commented on code in PR #391:
URL:
https://github.com/apache/maven-dependency-plugin/pull/391#discussion_r1607031492
##########
src/main/java/org/apache/maven/plugins/dependency/tree/JsonDependencyNodeVisitor.java:
##########
@@ -0,0 +1,181 @@
+/*
+ * 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.plugins.dependency.tree;
+
+import java.io.Writer;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.maven.artifact.Artifact;
+import org.apache.maven.shared.dependency.graph.DependencyNode;
+import
org.apache.maven.shared.dependency.graph.traversal.DependencyNodeVisitor;
+
+/**
+ * A dependency node visitor that serializes visited nodes to a writer using
the JSON format.
+ */
+public class JsonDependencyNodeVisitor extends AbstractSerializingVisitor
implements DependencyNodeVisitor {
+
+ private String indentChar = " ";
+
+ /**
+ * Creates a new instance of {@link JsonDependencyNodeVisitor}. The writer
will be used to write the output.
+ * @param writer the writer to write to
+ */
+ public JsonDependencyNodeVisitor(Writer writer) {
+ super(writer);
+ }
+
+ @Override
+ public boolean visit(DependencyNode node) {
+ if (node.getParent() == null || node.getParent() == node) {
+ writeRootNode(node);
+ }
+ return true;
+ }
+
+ /**
+ * Writes the node to the writer. This method is recursive and will write
all children nodes.
+ * @param node the node to write
+ */
+ private void writeRootNode(DependencyNode node) {
+ Set<DependencyNode> visited = new HashSet<DependencyNode>();
+ int indent = 2;
+ StringBuilder sb = new StringBuilder();
+ sb.append("{").append("\n");
+ writeNode(indent, node, sb, visited);
+ sb.append("}").append("\n");
+ writer.write(sb.toString());
+ }
+ /**
+ * Appends the node and its children to the string builder.
+ * @param indent the current indent level
+ * @param node the node to write
+ * @param sb the string builder to append to
+ */
+ private void writeNode(int indent, DependencyNode node, StringBuilder sb,
Set<DependencyNode> visited) {
+ if (visited.contains(node)) {
+ // Circular dependency detected
+ // Should an exception be thrown?
+ return;
+ }
+ visited.add(node);
+ appendNodeValues(sb, indent, node.getArtifact(),
!node.getChildren().isEmpty());
+ if (!node.getChildren().isEmpty()) {
+ writeChildren(indent, node, sb, visited);
+ }
+ }
+ /**
+ * Writes the children of the node to the string builder. And each
children of each node will be written recursively.
+ * @param indent the current indent level
+ * @param node the node to write
+ * @param sb the string builder to append to
+ */
+ private void writeChildren(int indent, DependencyNode node, StringBuilder
sb, Set<DependencyNode> visited) {
+ sb.append(indent(indent)).append("\"children\": [").append("\n");
+ indent += 2;
+ for (int i = 0; i < node.getChildren().size(); i++) {
+ DependencyNode child = node.getChildren().get(i);
+ sb.append(indent(indent));
+ sb.append("{").append("\n");
+ writeNode(indent + 2, child, sb, visited);
+ sb.append(indent(indent)).append("}");
+ // we skip the comma for the last child
+ if (i != node.getChildren().size() - 1) {
+ sb.append(",");
+ }
+ sb.append("\n");
+ }
+ sb.append(indent(indent)).append("]").append("\n");
+ }
+
+ @Override
+ public boolean endVisit(DependencyNode node) {
+ return true;
+ }
+ /**
+ * Appends the artifact values to the string builder.
+ * @param sb the string builder to append to
Review Comment:
updated
> improve mvn dependency:tree - add optional JSON output of the results
> ---------------------------------------------------------------------
>
> Key: MDEP-799
> URL: https://issues.apache.org/jira/browse/MDEP-799
> Project: Maven Dependency Plugin
> Issue Type: New Feature
> Components: tree
> Reporter: Zhenxu Ke
> Priority: Major
>
> I'd like to add an output type JSON, will open a pull request soon
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