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authorBrian S. O'Neill <bronee@gmail.com>2007-03-28 22:00:24 +0000
committerBrian S. O'Neill <bronee@gmail.com>2007-03-28 22:00:24 +0000
commit8809341248c62b15b78d7e6d8e06ab2ec3793c8e (patch)
treef39d7353987e025758e0a3abe1ffb49a48e9be9e /src/main/java/com/amazon/carbonado/Automatic.java
parent65478f17ada9df04c4c2afa734378bb50ec2bd13 (diff)
Merged 1.2-dev to trunk.
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+/*
+ * Copyright 2006 Amazon Technologies, Inc. or its affiliates.
+ * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
+ * of Amazon Technologies, Inc. or its affiliates. All rights reserved.
+ *
+ * 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 com.amazon.carbonado;
+
+import java.lang.annotation.*;
+
+/**
+ * Identifies a {@link Storable} property capable of selecting its own value on
+ * insert. The actual process by which a value is automatically assigned is
+ * repository dependent. In the JDBC repository, the value might come from an
+ * auto-increment column or a database-specific trigger.
+ *
+ * <p>If the underlying repository doesn't automatically supply a value to an
+ * automatic property, no immediate warning is given and instead the property
+ * will be assigned a default value of null or zero. This may cause problems if
+ * the automatic property is a member of a key. Explicitly specifying a value
+ * can sometimes be used to bypass the automatic value altogether.
+ *
+ * <p>Example:<pre>
+ * &#64;PrimaryKey("userInfoID")
+ * public interface UserInfo extends Storable&lt;UserInfo&gt; {
+ * <b>&#64;Automatic</b>
+ * long getUserInfoID();
+ * void setUserInfoID(long id);
+ *
+ * ...
+ * }
+ * </pre>
+ *
+ * @author Brian S O'Neill
+ * @see Sequence
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface Automatic {
+}