update: add common values for HTTP cache header annotation

• update: add common values for HTTP cache header annotation

Resolves #112 (closed)

http/src/main/java/org/eclipsefoundation/http/namespace/CacheControlCommonValues.java

+/*********************************************************************
+* Copyright (c) 2024 Eclipse Foundation.
+*
+* This program and the accompanying materials are made
+* available under the terms of the Eclipse Public License 2.0
+* which is available at https://www.eclipse.org/legal/epl-2.0/
+*
+* SPDX-License-Identifier: EPL-2.0
+**********************************************************************/
+/**
+ * 
+ */
+package org.eclipsefoundation.http.namespace;
+
+/**
+ * Common values used for Cache-Control headers in ehte Eclipse Foundation space. As annotations cannot be decomposed, this is the best we
+ * can do for standardized values for caching.
+ * 
+ * <p>
+ * For "safe" caching level, use the following:
+ * <p>
+ * &commat;Cache(maxAge=CacheControlCommonValues.SAFE_CACHE_MAX_AGE)
+ * 
+ * <p>
+ * For "aggressive" caching level, use the following:
+ * <p>
+ * &commat;Cache(maxAge=CacheControlCommonValues.AGGRESSIVE_CACHE_MAX_AGE)
+ * 
+ * <p>
+ * For no HTTP level caching, use the following:
+ * <p>
+ * &commat;Cache(noStore=true)
+ * 
+ */
+public final class CacheControlCommonValues {
+
+    public static final int SAFE_CACHE_MAX_AGE = 300;
+    public static final int AGGRESSIVE_CACHE_MAX_AGE = 600;
+
+    private CacheControlCommonValues() {
+    }
+}