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authorJim Hahn <jrh3@att.com>2019-08-06 12:17:29 -0400
committerJim Hahn <jrh3@att.com>2019-08-14 17:28:30 -0400
commit98a4da643c738a4246cc4cc4aa9c9f21ae47cff8 (patch)
tree758aed5947d4c49b79eb88c0ed1c0daaf5376682 /utils/src/main
parentd8930c7ea6f302f4364512867583510cea47b52a (diff)
Add ApiUtils to facilitate looping over features
A number of places in the code (common & drools-pdp) loop over features, giving each provider a chance to act on something. Created a common method in a new ApiUtils class to faciliate it. Renamed to FeatureApiUtils per review comment. Change-Id: I0c2cf0f33854cb5b6921b394f64de498a6234909 Issue-ID: POLICY-1968 Signed-off-by: Jim Hahn <jrh3@att.com>
Diffstat (limited to 'utils/src/main')
-rw-r--r--utils/src/main/java/org/onap/policy/common/utils/services/FeatureApiUtils.java61
1 files changed, 61 insertions, 0 deletions
diff --git a/utils/src/main/java/org/onap/policy/common/utils/services/FeatureApiUtils.java b/utils/src/main/java/org/onap/policy/common/utils/services/FeatureApiUtils.java
new file mode 100644
index 00000000..e88361ea
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/services/FeatureApiUtils.java
@@ -0,0 +1,61 @@
+/*
+ * ============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.utils.services;
+
+import java.util.List;
+import java.util.function.BiConsumer;
+import java.util.function.Predicate;
+
+/**
+ * Utilities for use with "feature APIs".
+ */
+public class FeatureApiUtils {
+
+ private FeatureApiUtils() {
+ // do nothing
+ }
+
+ /**
+ * Applies a function on each feature provider, stopping as soon as one returns true.
+ *
+ * @param providers list of feature providers
+ * @param predicate function to be applied to each provider
+ * @param handleEx function to handle any exception generated by the predicate
+ * (typically, by logging the message)
+ * @return {@code true} if one of the providers returned {@code true}, {@code false}
+ * otherwise
+ */
+ public static <T> boolean apply(List<T> providers, Predicate<T> predicate,
+ BiConsumer<T,Exception> handleEx) {
+
+ for (T feature : providers) {
+ try {
+ if (predicate.test(feature)) {
+ return true;
+ }
+ } catch (RuntimeException e) {
+ handleEx.accept(feature, e);
+ }
+ }
+
+ return false;
+ }
+}