1 files changed, 141 insertions, 0 deletions
diff --git a/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/extension/internal/CoreExtensionEntry.java b/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/extension/internal/CoreExtensionEntry.java
new file mode 100644
index 00000000..edadeb2d
--- /dev/null
+++ b/framework/src/maven/apache-maven-3.3.3/maven-core/src/main/java/org/apache/maven/extension/internal/CoreExtensionEntry.java
@@ -0,0 +1,141 @@
+package org.apache.maven.extension.internal;
+
+/*
+ * 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.
+ */
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.Collection;
+import java.util.Enumeration;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import org.apache.maven.project.ExtensionDescriptor;
+import org.apache.maven.project.ExtensionDescriptorBuilder;
+import org.codehaus.plexus.classworlds.realm.ClassRealm;
+import org.codehaus.plexus.util.IOUtil;
+
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Provides information about artifacts (identified by groupId:artifactId string key) and classpath elements exported by
+ * Maven core itself or a Maven core extension.
+ * 
+ * @since 3.3.0
+ */
+public class CoreExtensionEntry
+{
+    private final ClassRealm realm;
+
+    private final Set<String> artifacts;
+
+    private final Set<String> packages;
+
+    public CoreExtensionEntry( ClassRealm realm, Collection<String> artifacts, Collection<String> packages )
+    {
+        this.realm = realm;
+        this.artifacts = ImmutableSet.copyOf( artifacts );
+        this.packages = ImmutableSet.copyOf( packages );
+    }
+
+    /**
+     * Returns ClassLoader used to load extension classes.
+     */
+    public ClassRealm getClassRealm()
+    {
+        return realm;
+    }
+
+    /**
+     * Returns artifacts exported by the extension, identified by groupId:artifactId string key.
+     */
+    public Set<String> getExportedArtifacts()
+    {
+        return artifacts;
+    }
+
+    /**
+     * Returns classpath elements exported by the extension.
+     */
+    public Set<String> getExportedPackages()
+    {
+        return packages;
+    }
+
+    private static final ExtensionDescriptorBuilder builder = new ExtensionDescriptorBuilder();
+
+    public static CoreExtensionEntry discoverFrom( ClassRealm loader )
+    {
+        Set<String> artifacts = new LinkedHashSet<String>();
+        Set<String> packages = new LinkedHashSet<String>();
+
+        try
+        {
+            Enumeration<URL> urls = loader.getResources( builder.getExtensionDescriptorLocation() );
+            while ( urls.hasMoreElements() )
+            {
+                InputStream is = urls.nextElement().openStream();
+                try
+                {
+                    ExtensionDescriptor descriptor = builder.build( is );
+                    artifacts.addAll( descriptor.getExportedArtifacts() );
+                    packages.addAll( descriptor.getExportedPackages() );
+                }
+                finally
+                {
+                    IOUtil.close( is );
+                }
+            }
+        }
+        catch ( IOException ignored )
+        {
+            // exports descriptors are entirely optional
+        }
+
+        return new CoreExtensionEntry( loader, artifacts, packages );
+    }
+
+    public static CoreExtensionEntry discoverFrom( ClassRealm loader, Collection<File> classpath )
+    {
+        Set<String> artifacts = new LinkedHashSet<String>();
+        Set<String> packages = new LinkedHashSet<String>();
+
+        try
+        {
+            for ( File entry : classpath )
+            {
+                ExtensionDescriptor descriptor = builder.build( entry );
+                if ( descriptor != null )
+                {
+                    artifacts.addAll( descriptor.getExportedArtifacts() );
+                    packages.addAll( descriptor.getExportedPackages() );
+                }
+            }
+        }
+        catch ( IOException ignored )
+        {
+            // exports descriptors are entirely optional
+        }
+
+        return new CoreExtensionEntry( loader, artifacts, packages );
+    }
+
+}