1 files changed, 113 insertions, 0 deletions
diff --git a/java/junit-toolkit-maven-plugin/src/main/org/apache/qpid/junit/maven/IsolatedClassLoader.java b/java/junit-toolkit-maven-plugin/src/main/org/apache/qpid/junit/maven/IsolatedClassLoader.java
new file mode 100644
index 0000000000..dc74590f60
--- /dev/null
+++ b/java/junit-toolkit-maven-plugin/src/main/org/apache/qpid/junit/maven/IsolatedClassLoader.java
@@ -0,0 +1,113 @@
+/*
+ *
+ * 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.qpid.junit.maven;
+
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * <p><table id="crc"><caption>CRC Card</caption>
+ * <tr><th> Responsibilities <th> Collaborations
+ * </table>
+ *
+ * @author Rupert Smith
+ *
+ * @noinspection CustomClassloader
+ */
+public class IsolatedClassLoader extends URLClassLoader
+{
+
+    private static final URL[] EMPTY_URL_ARRAY = new URL[0];
+    private ClassLoader parent = ClassLoader.getSystemClassLoader();
+
+    private Set urls = new HashSet();
+
+    private boolean childDelegation = true;
+
+    public IsolatedClassLoader()
+    {
+        super(EMPTY_URL_ARRAY, null);
+    }
+
+    public IsolatedClassLoader(ClassLoader parent, boolean childDelegation)
+    {
+        super(EMPTY_URL_ARRAY, parent);
+
+        this.childDelegation = childDelegation;
+    }
+
+    public IsolatedClassLoader(ClassLoader parent)
+    {
+        super(EMPTY_URL_ARRAY, parent);
+    }
+
+    public void addURL(URL url)
+    {
+        // avoid duplicates
+        if (!urls.contains(url))
+        {
+            super.addURL(url);
+            urls.add(url);
+        }
+    }
+
+    public synchronized Class loadClass(String name) throws ClassNotFoundException
+    {
+        Class c;
+
+        if (childDelegation)
+        {
+            c = findLoadedClass(name);
+
+            ClassNotFoundException ex = null;
+
+            if (c == null)
+            {
+                try
+                {
+                    c = findClass(name);
+                }
+                catch (ClassNotFoundException e)
+                {
+                    ex = e;
+
+                    if (parent != null)
+                    {
+                        c = parent.loadClass(name);
+                    }
+                }
+            }
+
+            if (c == null)
+            {
+                throw ex;
+            }
+        }
+        else
+        {
+            c = super.loadClass(name);
+        }
+
+        return c;
+    }
+}