1 files changed, 80 insertions, 0 deletions
diff --git a/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/ip/subnet/validation/SubnetValidator.java b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/ip/subnet/validation/SubnetValidator.java
new file mode 100644
index 000000000..361113858
--- /dev/null
+++ b/v3po/v3po2vpp/src/main/java/io/fd/honeycomb/translate/v3po/interfaces/ip/subnet/validation/SubnetValidator.java
@@ -0,0 +1,80 @@
+/*
+ * 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.honeycomb.translate.v3po.interfaces.ip.subnet.validation;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.Function;
+import com.google.common.collect.Multimap;
+import com.google.common.collect.Multimaps;
+import io.fd.honeycomb.translate.v3po.interfaces.ip.Ipv4WriteUtils;
+import java.util.List;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.Subnet;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.subnet.Netmask;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.ip.rev140616.interfaces._interface.ipv4.address.subnet.PrefixLength;
+
+/**
+ * Validator for detecting if there is an attempt to assign multiple addresses from same subnet
+ */
+public class SubnetValidator {
+
+    /**
+     * Checks whether data provided for writing are not in collision with already existing data
+     */
+    public void checkNotAddingToSameSubnet(@Nonnull final List<Address> addresses)
+            throws SubnetValidationException {
+
+        final Multimap<Short, Address> prefixLengthRegister = Multimaps.index(addresses, toPrefixLength());
+        final int keySetSize = prefixLengthRegister.keySet().size();
+
+        if (keySetSize == 0 || keySetSize == addresses.size()) {
+            //this means that every key is unique(has only one value) or no addresses were prefix-length based ,so there is no conflict
+            return;
+        }
+
+        //finds conflicting prefix
+        final Short conflictingPrefix = prefixLengthRegister.keySet()
+                .stream()
+                .filter(a -> prefixLengthRegister.get(a).size() > 1)
+                .findFirst()
+                .get();
+
+        //and reports it with affected addresses
+        throw SubnetValidationException
+                .forConflictingData(conflictingPrefix, prefixLengthRegister.get(conflictingPrefix));
+    }
+
+    private static Function<Address, Short> toPrefixLength() {
+        return (final Address address) -> {
+            final Subnet subnet = address.getSubnet();
+
+            if (subnet instanceof PrefixLength) {
+                return ((PrefixLength) subnet).getPrefixLength();
+            }
+
+            if (address.getSubnet() instanceof Netmask) {
+                return (short) Ipv4WriteUtils.getSubnetMaskLength(
+                        checkNotNull(((Netmask) subnet).getNetmask(), "No netmask defined for %s", subnet)
+                                .getValue());
+            }
+
+            throw new IllegalArgumentException("Unsupported subnet : " + subnet);
+        };
+    }
+}