HONEYCOMB-296 - Reference checking in Locator set

Reference must be checked while removing to prevent
dead references

Change-Id: I37cb426f73a3fa64d4e6795062d8d7affc0cbb2b
Signed-off-by: Jan Srnicek <jsrnicek@cisco.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ReferenceCheck.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ReferenceCheck.java
new file mode 100644
index 000000000..847f28aed
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/hc2vpp/common/translate/util/ReferenceCheck.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.hc2vpp.common.translate.util;
+
+import static com.google.common.base.Preconditions.checkState;
+
+import java.util.Collection;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Checks references exist, and throws if present
+ */
+public interface ReferenceCheck {
+
+    /**
+     * Checks if references are present, and throw if so
+     *
+     * @throws IllegalStateException if any references present
+     */
+    default <T extends DataObject> void checkReferenceExist(@Nonnull final InstanceIdentifier<?> locSetId,
+                                                                  final Collection<T> references) {
+        checkState(references == null || references.isEmpty(), "%s is referenced in %s", locSetId, references);
+    }
+}