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From adup...@apache.org
Subject [01/18] james-project git commit: JAMES-2578 Add utils for Mailet new API
Date Fri, 09 Nov 2018 07:52:08 GMT
Repository: james-project
Updated Branches:
  refs/heads/master d9978da2f -> 16eebbbb6


JAMES-2578 Add utils for Mailet new API


Project: http://git-wip-us.apache.org/repos/asf/james-project/repo
Commit: http://git-wip-us.apache.org/repos/asf/james-project/commit/fc35485f
Tree: http://git-wip-us.apache.org/repos/asf/james-project/tree/fc35485f
Diff: http://git-wip-us.apache.org/repos/asf/james-project/diff/fc35485f

Branch: refs/heads/master
Commit: fc35485f9deb2638430f1af8a3a7bd24717058ef
Parents: d9978da
Author: Gautier DI FOLCO <gdifolco@linagora.com>
Authored: Mon Nov 5 13:53:39 2018 +0100
Committer: Gautier DI FOLCO <gdifolco@linagora.com>
Committed: Thu Nov 8 15:52:40 2018 +0100

----------------------------------------------------------------------
 .../java/org/apache/mailet/AttributeUtils.java  | 67 ++++++++++++++++++++
 1 file changed, 67 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/james-project/blob/fc35485f/mailet/api/src/main/java/org/apache/mailet/AttributeUtils.java
----------------------------------------------------------------------
diff --git a/mailet/api/src/main/java/org/apache/mailet/AttributeUtils.java b/mailet/api/src/main/java/org/apache/mailet/AttributeUtils.java
new file mode 100644
index 0000000..c6b1965
--- /dev/null
+++ b/mailet/api/src/main/java/org/apache/mailet/AttributeUtils.java
@@ -0,0 +1,67 @@
+/****************************************************************
+ * 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.mailet;
+
+import java.util.Optional;
+
+/** 
+ * Attribute
+ * 
+ * @since Mailet API v3.2
+ */
+public class AttributeUtils {
+    /**
+     * Returns the raw attribute value corresponding to an attribute name.
+     *
+     * A cast will be attempted to match the type expected by the user.
+     *
+     * Returns an empty optional upon missing attribute or type mismatch.
+     */
+    public static <T> Optional<T> getValueAndCastFromMail(Mail mail, AttributeName
name, Class<T> type) {
+        return getAttributeValueFromMail(mail, name)
+                .flatMap(value -> tryToCast(type, value));
+    }
+
+    /**
+     * Returns the raw attribute value corresponding to an attribute name.
+     *
+     * Returns an empty optional upon missing attribute
+     */
+    public static Optional<?> getAttributeValueFromMail(Mail mail, AttributeName name)
{
+        return mail
+                .getAttribute(name)
+                .map(AttributeUtils::getAttributeValue);
+    }
+
+    /**
+     * Returns the raw value of an Attribute
+     */
+    public static Object getAttributeValue(Attribute attribute) {
+        return attribute.getValue().getValue();
+    }
+
+    private static <T> Optional<T> tryToCast(Class<T> type, Object value)
{
+        if (type.isInstance(value)) {
+            return Optional.of(type.cast(value));
+        } else {
+            return Optional.empty();
+        }
+    }
+}


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