- made semver4j optional in module definition

- added second alternative: MavenVersionManager
- added test for MavenVersionManager

pf4j/pom.xml

@@ -103,6 +103,12 @@
 			<version>3.1.0</version>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.maven</groupId>
+			<artifactId>maven-artifact</artifactId>
+			<version>3.8.1</version>
+			<optional>true</optional>
+		</dependency>
         <dependency>
             <groupId>org.ow2.asm</groupId>
             <artifactId>asm</artifactId>

pf4j/src/main/java/module-info.java

@@ -43,7 +43,12 @@ module org.pf4j {
     // The semver4j library currently does not provide a module.
     // Maybe we should send them a pull request, that at least they provide an
     // automatic module name in their MANIFEST file.
-    requires semver4j;
+    requires static semver4j;
+    
+    // The maven-artifact library currently does not provide a module.
+    // Maybe we should send them a pull request, that at least they provide an
+    // automatic module name in their MANIFEST file.
+    requires static maven.artifact;
 
     // Maybe we should reconsider the package hierarchy, that only classes are
     // exported, which are required by 3rd party developers.

pf4j/src/main/java/org/pf4j/MavenVersionManager.java

@@ -0,0 +1,70 @@
+package org.pf4j;
+
+import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
+import org.apache.maven.artifact.versioning.VersionRange;
+import org.pf4j.util.StringUtils;
+
+/**
+ * Implementation for {@link VersionManager}.
+ * This implementation uses Maven . Before using it you have to include the optional dependency maven-artifact
+ *
+ * @author Wolfram Haussig
+ */
+public class MavenVersionManager implements VersionManager {
+
+    /**
+     * parses a version with the current parser type
+     * @param version
+     */
+    protected DefaultArtifactVersion parseVersion(String version) {
+        if (version == null)
+            return new DefaultArtifactVersion("");
+        return new DefaultArtifactVersion(version);
+    }
+
+    /**
+     * Checks if a version satisfies the specified SemVer {@link Expression} string.
+     * If the constraint is empty or null then the method returns true.
+     * Constraint examples: {@code >2.0.0} (simple), {@code "1.1.1 || 1.2.3 - 2.0.0"} (range).
+     * See https://github.com/vdurmont/semver4j#requirements for more info.
+     *
+     * @param version
+     * @param constraint
+     * @return
+     */
+    @Override
+    public boolean checkVersionConstraint(String version, String constraint) {
+        if (StringUtils.isNullOrEmpty(constraint) || "*".equals(constraint)) {
+            return true;
+        }
+        try {
+            return VersionRange.createFromVersionSpec(constraint).containsVersion(parseVersion(version));
+        } catch (org.apache.maven.artifact.versioning.InvalidVersionSpecificationException e) {
+            //throw custom InvalidVersionSpecificationException as the interface does not declare an exception to be thrown
+            //so we need a RuntimeException here
+            throw new InvalidVersionSpecificationException("failed to parse constraint as maven version range: " + constraint, e);
+        }
+    }
+
+    @Override
+    public int compareVersions(String v1, String v2) {
+        return parseVersion(v1).compareTo(parseVersion(v2));
+    }
+
+    @Override
+    public boolean isStable(String version) {
+        DefaultArtifactVersion av = parseVersion(version);
+        return av.getQualifier() == null || !"SNAPSHOT".equals(av.getQualifier());
+    }
+    
+    public static class InvalidVersionSpecificationException extends RuntimeException
+    {
+        
+        private static final long serialVersionUID = 8636081416771885576L;
+
+        public InvalidVersionSpecificationException( String message, Throwable cause )
+        {
+            super( message, cause);
+        }
+    }
+}

pf4j/src/test/java/org/pf4j/MavenVersionManagerTest.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2012-present the original author or authors.
+ *
+ * Licensed 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.pf4j;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * @author Wolfram Haussig
+ */
+public class MavenVersionManagerTest {
+
+    private VersionManager versionManager;
+
+    @BeforeEach
+    public void init() {
+        versionManager = new MavenVersionManager();
+    }
+
+    @Test
+    public void checkVersionConstraint() {
+        assertFalse(versionManager.checkVersionConstraint("1.4.3", "(2.0.0,]")); // simple
+        // range
+        assertFalse(versionManager.checkVersionConstraint("1.3.9", "[1.4.0,1.6.0)"));
+        assertTrue(versionManager.checkVersionConstraint("1.4.0", "[1.4.0,1.6.0)"));
+        assertTrue(versionManager.checkVersionConstraint("1.4.3", "[1.4.0,1.6.0)"));
+        assertFalse(versionManager.checkVersionConstraint("1.6.0", "[1.4.0,1.6.0)"));
+        assertTrue(versionManager.checkVersionConstraint("undefined", "*"));
+    }
+
+    @Test
+    public void nullOrEmptyVersion() {
+        assertFalse(versionManager.checkVersionConstraint(null, "(2.0.0,]"));
+    }
+
+    @Test
+    public void invalidVersion() {
+        assertFalse(versionManager.checkVersionConstraint("1.0", "(2.0.0,]"));
+    }
+
+    @Test
+    public void compareVersions() {
+        assertTrue(versionManager.compareVersions("1.1.0", "1.0.0") > 0);
+    }
+
+    @Test
+    public void isStable() {
+        assertTrue(versionManager.isStable("1.1.0"));
+        assertFalse(versionManager.isStable("1.1.0-SNAPSHOT"));
+    }
+    @Test
+    public void supportsSnapshotVersions() {
+        assertTrue(versionManager.compareVersions("1.0.0-SNAPSHOT", "1.0.0-SNAPSHOT") >= 0);
+        assertTrue(versionManager.checkVersionConstraint("1.0.0", "[1.0.0-SNAPSHOT,]"));
+    }
+
+}