1 files changed, 137 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-M1-20060522/java/sca/common/src/main/java/org/apache/tuscany/common/resource/impl/ResourceLoaderImpl.java b/sca-java-1.x/tags/java-M1-20060522/java/sca/common/src/main/java/org/apache/tuscany/common/resource/impl/ResourceLoaderImpl.java
new file mode 100644
index 0000000000..d306edf3b4
--- /dev/null
+++ b/sca-java-1.x/tags/java-M1-20060522/java/sca/common/src/main/java/org/apache/tuscany/common/resource/impl/ResourceLoaderImpl.java
@@ -0,0 +1,137 @@
+/**
+ *
+ *  Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
+ *
+ *  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.apache.tuscany.common.resource.impl;
+
+import java.io.IOException;
+import java.lang.ref.WeakReference;
+import java.net.URL;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+import org.apache.tuscany.common.resource.ResourceLoader;
+
+/**
+ * Default implementation of the ResourceLoader interface
+ *
+ * @version $Rev: 369102 $ $Date: 2006-01-14 13:48:56 -0800 (Sat, 14 Jan 2006) $
+ */
+@SuppressWarnings({"ClassLoader2Instantiation"})
+public class ResourceLoaderImpl implements ResourceLoader {
+    private final WeakReference<ClassLoader> classLoaderReference;
+    private WeakReference<GeneratedClassLoader> generatedClassLoaderReference;
+    private final List<ResourceLoader> parents;
+
+    /**
+     * Constructs a new ResourceLoaderImpl to wrap a ClassLoader.
+     *
+     * @param classLoader the classloader to wrap
+     */
+    public ResourceLoaderImpl(ClassLoader classLoader) {
+        classLoaderReference = new WeakReference<ClassLoader>(classLoader);
+        generatedClassLoaderReference = new WeakReference<GeneratedClassLoader>(new GeneratedClassLoader(classLoader));
+        ClassLoader parentCL = classLoader.getParent();
+        if (null == parentCL) {
+            parents = Collections.emptyList();
+        } else {
+            parents = Collections.singletonList((ResourceLoader) new ResourceLoaderImpl(parentCL));
+        }
+    }
+
+
+    public ClassLoader getClassLoader() throws IllegalStateException {
+        ClassLoader cl = classLoaderReference.get();
+        if (cl == null) {
+            throw new IllegalStateException("Referenced ClassLoader has been garbage collected");
+        }
+        return cl;
+    }
+
+    public List<ResourceLoader> getParents() {
+        return parents;
+    }
+
+    public Class<?> loadClass(String name) throws ClassNotFoundException {
+        GeneratedClassLoader cl = generatedClassLoaderReference.get();
+        if (cl != null) {
+            return Class.forName(name, true, cl);
+        } else {
+            return Class.forName(name, true, getClassLoader());
+        }
+    }
+
+    public Class<?> addClass(byte[] bytes) {
+        GeneratedClassLoader cl = generatedClassLoaderReference.get();
+        if (cl == null) {
+            cl = new GeneratedClassLoader(getClassLoader());
+            generatedClassLoaderReference = new WeakReference<GeneratedClassLoader>(cl);
+        }
+        return cl.addClass(bytes);
+    }
+
+    public Iterator<URL> getResources(String name) throws IOException {
+        return new EnumerationIterator<URL>(getClassLoader().getResources(name));
+    }
+
+    public URL getResource(String name) {
+        return getClassLoader().getResource(name);
+    }
+
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof ResourceLoaderImpl)) {
+            return false;
+        }
+        final ResourceLoaderImpl other = (ResourceLoaderImpl) obj;
+        return getClassLoader() == other.getClassLoader();
+    }
+
+    public int hashCode() {
+        return getClassLoader().hashCode();
+    }
+
+    private static class EnumerationIterator<E> implements Iterator<E> {
+        private final Enumeration<E> e;
+
+        public EnumerationIterator(Enumeration<E> e) {
+            this.e = e;
+        }
+
+        public boolean hasNext() {
+            return e.hasMoreElements();
+        }
+
+        public E next() {
+            // the try/catch is needed here to get IDEA to shut up
+            // there should be no performance overhead here except when the Exception is thrown
+            // so I am going to leave it in - feel free to remove if there is any issue
+            try {
+                return e.nextElement();
+            } catch (NoSuchElementException e1) {
+                throw e1;
+            }
+        }
+
+        public void remove() {
+            throw new UnsupportedOperationException();
+        }
+    }
+}