svn commit: r903142 - /commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/AnnotationRuleProviderUtils.java

[si...@apache.org]

Author: simonetripodi
Date: Tue Jan 26 09:40:58 2010
New Revision: 903142

URL: http://svn.apache.org/viewvc?rev=903142&view=rev
Log:
first checkin of AnnotationRuleProviderUtils class

Added:
    commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/AnnotationRuleProviderUtils.java   (with props)

Added: commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/AnnotationRuleProviderUtils.java
URL: http://svn.apache.org/viewvc/commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/AnnotationRuleProviderUtils.java?rev=903142&view=auto
==============================================================================
--- commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/AnnotationRuleProviderUtils.java (added)
+++ commons/sandbox/at-digester/trunk/src/java/org/apache/commons/digester/annotations/utils/AnnotationRuleProviderUtils.java Tue Jan 26 09:40:58 2010
@@ -0,0 +1,72 @@
+/*
+ * 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.commons.digester.annotations.utils;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.AnnotatedElement;
+
+import org.apache.commons.beanutils.ConstructorUtils;
+import org.apache.commons.digester.Rule;
+import org.apache.commons.digester.annotations.AnnotationRuleProvider;
+
+/**
+ * Utilities class to manipulate the {@link AnnotationRuleProvider} instances.
+ *
+ * @version $Id$
+ * @since 2.1
+ */
+public final class AnnotationRuleProviderUtils {
+
+    /**
+     * Private constructor, this class can't be instantiated.
+     */
+    private AnnotationRuleProviderUtils() {
+        // do nothing
+    }
+
+    /**
+     * Builds a new {@link AnnotationRuleProvider} instance.
+     *
+     * @param <A> the annotation type.
+     * @param <E> the annotated element type.
+     * @param <R> the reflected digester rule type.
+     * @param klass the {@link AnnotationRuleProvider} type has to be instantiated.
+     * @param annotation the current visited annotation.
+     * @param element the current visited element.
+     * @param rule the reflected commons-digester rule.
+     * @return a new {@link AnnotationRuleProvider} instance.
+     */
+    public static <A extends Annotation, E extends AnnotatedElement, R extends Rule> AnnotationRuleProvider<A, E, R> newProvider(Class<? extends AnnotationRuleProvider<A, E, R>> klass,
+            A annotation,
+            E element,
+            R rule) {
+        Object[] args = new Object[] { annotation, element };
+        Class<?>[] parameterTypes = new Class<?>[] { annotation.annotationType(), element.getClass() };
+
+        try {
+            Object o = ConstructorUtils.invokeExactConstructor(klass,
+                    args,
+                    parameterTypes);
+            return klass.cast(o);
+        } catch (Throwable t) {
+            throw new RuntimeException("Impossible to instantiate provider of type '"
+                    + klass.getName()
+                    + "', see nested exceptions", t);
+        }
+    }
+
+}

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