From e340fb0d2ad2fc88374c26e765f5dc983f6634ac Mon Sep 17 00:00:00 2001
From: michaeloffner <michaeloffner@users.noreply.github.com>
Date: Tue, 16 Jul 2024 10:28:07 +0200
Subject: [PATCH] add initial version of MavenClassLoader

---
 .../commons/io/res/util/MavenClassLoader.java | 25 ++++++++++++
 .../io/res/util/ResourceClassLoader.java      |  2 +-
 core/src/main/java/lucee/runtime/mvn/POM.java | 38 +++++++++++++++++--
 3 files changed, 60 insertions(+), 5 deletions(-)
 create mode 100644 core/src/main/java/lucee/commons/io/res/util/MavenClassLoader.java

diff --git a/core/src/main/java/lucee/commons/io/res/util/MavenClassLoader.java b/core/src/main/java/lucee/commons/io/res/util/MavenClassLoader.java
new file mode 100644
index 0000000000..ddf9b859c6
--- /dev/null
+++ b/core/src/main/java/lucee/commons/io/res/util/MavenClassLoader.java
@@ -0,0 +1,25 @@
+package lucee.commons.io.res.util;
+
+import java.io.IOException;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import lucee.runtime.mvn.POM;
+
+public class MavenClassLoader extends ResourceClassLoader {
+
+	private static Map<String, MavenClassLoader> instances = new ConcurrentHashMap<>();
+
+	public MavenClassLoader(POM pom, ClassLoader parent) throws IOException {
+		super(pom.getJars(), parent);
+	}
+
+	public static MavenClassLoader getInstance(POM pom, ClassLoader parent) throws IOException {
+		MavenClassLoader mcl = instances.get(pom.hash());
+		if (mcl == null) {
+			mcl = new MavenClassLoader(pom, parent);
+			instances.put(pom.hash(), mcl);
+		}
+		return mcl;
+	}
+}
diff --git a/core/src/main/java/lucee/commons/io/res/util/ResourceClassLoader.java b/core/src/main/java/lucee/commons/io/res/util/ResourceClassLoader.java
index a9957c46f3..cfed5ab7ba 100755
--- a/core/src/main/java/lucee/commons/io/res/util/ResourceClassLoader.java
+++ b/core/src/main/java/lucee/commons/io/res/util/ResourceClassLoader.java
@@ -38,7 +38,7 @@
 /**
  * Classloader that load classes from resources
  */
-public final class ResourceClassLoader extends URLClassLoader implements Closeable {
+public class ResourceClassLoader extends URLClassLoader implements Closeable {
 
 	private List<Resource> resources = new ArrayList<Resource>();
 	private Map<String, SoftReference<ResourceClassLoader>> customCLs;
diff --git a/core/src/main/java/lucee/runtime/mvn/POM.java b/core/src/main/java/lucee/runtime/mvn/POM.java
index 19d6f673d5..76b921cee6 100644
--- a/core/src/main/java/lucee/runtime/mvn/POM.java
+++ b/core/src/main/java/lucee/runtime/mvn/POM.java
@@ -37,9 +37,9 @@ public class POM {
 	public static final int SCOPE_ALL = SCOPE_NOT_TEST + SCOPE_TEST;
 
 	private Resource localDirectory;
-	private String groupId;
-	private String artifactId;
-	private String version;
+	private final String groupId;
+	private final String artifactId;
+	private final String version;
 	private String scope;
 	private String optional;
 	private int dependencyScope = SCOPE_ALL;
@@ -76,6 +76,8 @@ public class POM {
 
 	private String artifactExtension;
 
+	private String hash;
+
 	public static POM getInstance(Resource localDirectory, String groupId, String version, String artifactId, Log log) {
 		return getInstance(localDirectory, null, groupId, artifactId, version, null, null, SCOPE_NOT_TEST, SCOPE_ALL, log);
 	}
@@ -323,7 +325,14 @@ private StringBuilder _hash(StringBuilder sb) throws IOException {
 	}
 
 	public String hash() throws IOException {
-		return HashUtil.create64BitHashAsString(_hash(new StringBuilder()));
+		if (hash == null) {
+			synchronized (groupId) {
+				if (hash == null) {
+					hash = HashUtil.create64BitHashAsString(_hash(new StringBuilder()));
+				}
+			}
+		}
+		return hash;
 	}
 
 	Resource getArtifact(String type) {
@@ -514,4 +523,25 @@ private static TreeNode<POM> getParents(POM pom, TreeNode<POM> parents) throws I
 		}
 		return parents;
 	}
+
+	public Resource[] getJars() throws IOException {
+		List<Resource> jars = new ArrayList<>();
+
+		// current
+		if ("jar".equalsIgnoreCase(this.artifactExtension)) {
+			Resource r = getArtifact();
+			if (r != null) jars.add(r);
+		}
+
+		List<POM> dependencies = getAllDependencies();
+		if (dependencies != null) {
+			for (POM p: dependencies) {
+				if ("jar".equalsIgnoreCase(p.artifactExtension)) {
+					Resource r = p.getArtifact();
+					if (r != null) jars.add(r);
+				}
+			}
+		}
+		return jars.toArray(new Resource[jars.size()]);
+	}
 }