1 files changed, 62 insertions, 0 deletions
diff --git a/csarvalidation/src/main/java/org/onap/cvc/csar/ReleasesResolver.java b/csarvalidation/src/main/java/org/onap/cvc/csar/ReleasesResolver.java
new file mode 100644
index 0000000..4a9c8d1
--- /dev/null
+++ b/csarvalidation/src/main/java/org/onap/cvc/csar/ReleasesResolver.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2021 Nokia
+ *
+ * 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 org.onap.cvc.csar;
+
+import java.util.Arrays;
+import java.util.LinkedList;
+import java.util.List;
+
+public class ReleasesResolver {
+    public static final String SPLIT_BY_COMMA = ",";
+    public static final String SPECIAL_KEYWORD = "latest";
+    public static final int NOT_FOUND = -1;
+    private final String[] releaseInOrder;
+
+    private ReleasesResolver(String[] releaseInOrder) {
+        this.releaseInOrder = releaseInOrder;
+    }
+
+    public static ReleasesResolver create(String releaseInOrder) {
+        return new ReleasesResolver(releaseInOrder.split(SPLIT_BY_COMMA));
+    }
+
+    public List<String> resolveWithAncestors(String release) {
+        final int index = findIndexOf(release);
+        if (isReleaseAvailable(index)) {
+            throw new IllegalArgumentException(String.format("Release '%s' is not defined at the releases.order list in a vnfreqs.properties file!", release));
+        }
+        return new LinkedList<>(getElements(this.releaseInOrder, index));
+    }
+
+    private boolean isReleaseAvailable(int index) {
+        return index == NOT_FOUND;
+    }
+
+    private List<String> getElements(String[] elements, int index) {
+        return Arrays.asList(elements).subList(0, index + 1);
+    }
+
+    private int findIndexOf(String release) {
+        if (release.equals(SPECIAL_KEYWORD)) {
+            return getIndexOfLastElement();
+        }
+        return Arrays.asList(this.releaseInOrder).indexOf(release);
+    }
+
+    private int getIndexOfLastElement() {
+        return this.releaseInOrder.length - 1;
+    }
+}