Add NotNull and NotBlank parameter validation

Modified the ParameterValidator to support new NotNull and NotBlank
annotations indicating that a field should not be null or blank.
These annotations can be made at class level or individual field level.

Moved annotations to their own subdirectory.
Added a comment to a method.
Extracted constant strings.
Moved one annotation to the subclass level.

Added support for "Min" annotation.

Propagate validation errors up from nested items.  Apply
field-level validations, even when field is a ParameterGroup.

Change-Id: Ic90df55487dc5db7b7b0be5397624d1957904a81
Issue-ID: POLICY-1542
Signed-off-by: Jim Hahn <jrh3@att.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/common-parameters/src/main/java/org/onap/policy/common/parameters/annotations/Min.java b/common-parameters/src/main/java/org/onap/policy/common/parameters/annotations/Min.java
new file mode 100644
index 00000000..9ad6d7e0
--- /dev/null
+++ b/common-parameters/src/main/java/org/onap/policy/common/parameters/annotations/Min.java
@@ -0,0 +1,39 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2019 AT&T Intellectual Property. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.parameters.annotations;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+@Retention(RUNTIME)
+@Target(FIELD)
+public @interface Min {
+
+    /**
+     * The minimum value allowed.
+     *
+     * @return the minimum value allowed
+     */
+    long value();
+}