diff --git a/pom.xml b/pom.xml
index fc068ac..7de2db6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -96,6 +96,13 @@
1
true
+
+
+ org.junit.jupiter
+ junit-jupiter-engine
+ 5.9.3
+ test
+
diff --git a/src/it/display-optional-information/expected.txt b/src/it/display-optional-information/expected.txt
new file mode 100644
index 0000000..ec5a3d5
--- /dev/null
+++ b/src/it/display-optional-information/expected.txt
@@ -0,0 +1,7 @@
+org.apache.maven.its.dependency-tree:test:jar:1.0-SNAPSHOT
++- org.apache.maven:maven-settings:jar:2.0.6:compile
+| +- org.codehaus.plexus:plexus-utils:jar:1.4.1:compile
+| \- org.codehaus.plexus:plexus-container-default:jar:1.0-alpha-9-stable-1:compile
+| +- junit:junit:jar:3.8.1:compile
+| \- classworlds:classworlds:jar:1.1-alpha-2:compile
+\- org.apache.maven:maven-model:jar:2.0.5:compile (optional)
\ No newline at end of file
diff --git a/src/it/display-optional-information/invoker.properties b/src/it/display-optional-information/invoker.properties
new file mode 100644
index 0000000..38ca093
--- /dev/null
+++ b/src/it/display-optional-information/invoker.properties
@@ -0,0 +1,18 @@
+# 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.
+
+invoker.goals = org.apache.maven.its.dependency-tree:graph-maven-plugin:graph
diff --git a/src/it/display-optional-information/pom.xml b/src/it/display-optional-information/pom.xml
new file mode 100644
index 0000000..96cd40d
--- /dev/null
+++ b/src/it/display-optional-information/pom.xml
@@ -0,0 +1,68 @@
+
+
+
+
+ 4.0.0
+
+ org.apache.maven.its.dependency-tree
+ test
+ 1.0-SNAPSHOT
+
+ Test
+
+ Test dependency-tree with actual Maven version through dependency:tree (easier than shade, or MPIR:dependencies).
+ Needs to be run in sequence with Maven 2.2.1, 3.0.x and 3.1-alpha-1+ to check the 3 graph API implementations.
+
+
+
+ UTF-8
+
+
+
+
+ org.apache.maven
+ maven-settings
+ 2.0.6
+
+
+ org.apache.maven
+ maven-model
+ 2.0.5
+ true
+
+
+
+
+
+
+
+ org.apache.maven.its.dependency-tree
+ graph-maven-plugin
+ 1.0-SNAPSHOT
+
+ target/tree.txt
+
+
+
+
+
+
diff --git a/src/it/display-optional-information/verify.groovy b/src/it/display-optional-information/verify.groovy
new file mode 100644
index 0000000..7d4dc1e
--- /dev/null
+++ b/src/it/display-optional-information/verify.groovy
@@ -0,0 +1,23 @@
+/*
+ * 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.
+ */
+
+
+actual = new File( basedir, "target/tree.txt" ).readLines()
+expected = new File( basedir, "expected.txt" ).readLines()
+assert actual.equals( expected )
diff --git a/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyGraphBuilder.java b/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyGraphBuilder.java
index 955dc3d..19d49f7 100644
--- a/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyGraphBuilder.java
+++ b/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyGraphBuilder.java
@@ -129,7 +129,7 @@ private DependencyNode buildDependencyNode(
String premanagedScope = DependencyManagerUtils.getPremanagedScope(node);
List exclusions = null;
- Boolean optional = null;
+ Boolean optional = artifact.isOptional();
if (node.getDependency() != null) {
exclusions = new ArrayList<>(node.getDependency().getExclusions().size());
for (Exclusion exclusion : node.getDependency().getExclusions()) {
diff --git a/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNode.java b/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNode.java
index 1c2d712..bd33d09 100644
--- a/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNode.java
+++ b/src/main/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNode.java
@@ -175,6 +175,6 @@ public List getExclusions() {
*/
@Override
public String toNodeString() {
- return String.valueOf(artifact);
+ return artifact + (Boolean.TRUE.equals(optional) ? " (optional)" : "");
}
}
diff --git a/src/test/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNodeTest.java b/src/test/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNodeTest.java
new file mode 100644
index 0000000..da7afea
--- /dev/null
+++ b/src/test/java/org/apache/maven/shared/dependency/graph/internal/DefaultDependencyNodeTest.java
@@ -0,0 +1,45 @@
+/*
+ * 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.shared.dependency.graph.internal;
+
+import org.apache.maven.artifact.Artifact;
+import org.apache.maven.artifact.DefaultArtifact;
+import org.junit.jupiter.api.Test;
+
+import static java.util.Collections.emptyList;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class DefaultDependencyNodeTest {
+
+ private final Artifact artifact = new DefaultArtifact("group", "artifact", "1.2", "compile", "jar", "", null);
+
+ @Test
+ public void nodeString_should_display_if_dependency_is_optonal() {
+ DefaultDependencyNode optionalNode =
+ new DefaultDependencyNode(null, artifact, "1.0", "compile", "1.0", true, emptyList());
+ assertEquals("group:artifact:jar:1.2:compile (optional)", optionalNode.toNodeString());
+ }
+
+ @Test
+ public void nodeString_for_mandatory_depenendency_does_not_contain_optional_information() {
+ DefaultDependencyNode optionalNode =
+ new DefaultDependencyNode(null, artifact, "1.0", "compile", "1.0", false, emptyList());
+ assertEquals("group:artifact:jar:1.2:compile", optionalNode.toNodeString());
+ }
+}