1 files changed, 158 insertions, 0 deletions
diff --git a/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/Ipv6Translator.java b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/Ipv6Translator.java
new file mode 100644
index 000000000..6be7a5f24
--- /dev/null
+++ b/vpp-common/vpp-translate-utils/src/main/java/io/fd/honeycomb/translate/v3po/util/Ipv6Translator.java
@@ -0,0 +1,158 @@
+/*
+ * 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.util;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.base.Preconditions.checkState;
+
+import com.google.common.net.InetAddresses;
+import java.net.UnknownHostException;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+import javax.annotation.Nonnull;
+import org.apache.commons.lang3.StringUtils;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpPrefix;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Address;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6AddressNoZone;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv6Prefix;
+
+/**
+ * Trait providing logic for translation of ipv6-related data
+ */
+public interface Ipv6Translator extends ByteDataTranslator {
+
+    /**
+     * Transform Ipv6 address to a byte array acceptable by VPP. VPP expects incoming byte array to be in the same order
+     * as the address.
+     *
+     * @return byte array with address bytes
+     */
+    default byte[] ipv6AddressNoZoneToArray(@Nonnull final Ipv6AddressNoZone ipv6Addr) {
+        byte[] retval = new byte[16];
+
+        //splits address and add ommited zeros for easier parsing
+        List<String> segments = Arrays.asList(ipv6Addr.getValue().split(":"))
+                .stream()
+                .map(segment -> StringUtils.repeat('0', 4 - segment.length()) + segment)
+                .collect(Collectors.toList());
+
+        byte index = 0;
+        for (String segment : segments) {
+
+            String firstPart = segment.substring(0, 2);
+            String secondPart = segment.substring(2);
+
+            //first part should be ommited
+            if ("00".equals(firstPart)) {
+                index++;
+            } else {
+                retval[index++] = ((byte) Short.parseShort(firstPart, 16));
+            }
+
+            retval[index++] = ((byte) Short.parseShort(secondPart, 16));
+        }
+
+        return retval;
+    }
+
+    /**
+     * Creates address array from address part of {@link Ipv6Prefix}
+     */
+    default byte[] ipv6AddressPrefixToArray(@Nonnull final Ipv6Prefix ipv4Prefix) {
+        checkNotNull(ipv4Prefix, "Cannot convert null prefix");
+
+        return ipv6AddressNoZoneToArray(new Ipv6AddressNoZone(
+                new Ipv6Address(ipv4Prefix.getValue().substring(0, ipv4Prefix.getValue().indexOf('/')))));
+    }
+
+    /**
+     * Extracts {@link Ipv6Prefix} prefix
+     */
+    default byte extractPrefix(Ipv6Prefix data) {
+        checkNotNull(data, "Cannot extract from null");
+
+        return Byte.valueOf(data.getValue().substring(data.getValue().indexOf('/') + 1));
+    }
+
+    /**
+     * Converts byte array to {@link Ipv6Prefix} with specified prefixLength
+     */
+    default Ipv6Prefix arrayToIpv6Prefix(final byte[] address, byte prefixLength) {
+        Ipv6AddressNoZone addressPart = arrayToIpv6AddressNoZone(address);
+
+        return new Ipv6Prefix(addressPart.getValue().concat("/").concat(String.valueOf(prefixLength)));
+    }
+
+    /**
+     * Parse byte array returned by VPP representing an Ipv6 address. Vpp returns IP byte arrays in reversed order.
+     *
+     * @return Ipv46ddressNoZone containing string representation of IPv6 address constructed from submitted bytes. No
+     * change in order.
+     */
+    @Nonnull
+    default Ipv6AddressNoZone arrayToIpv6AddressNoZone(@Nonnull byte[] ip) {
+        checkArgument(ip.length == 16, "Illegal array length");
+
+        try {
+            return new Ipv6AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
+        } catch (UnknownHostException e) {
+            throw new IllegalArgumentException("Unable to parse ipv6", e);
+        }
+    }
+
+    /**
+     * Detects whether {@code IpAddress} is ipv6
+     */
+    default boolean isIpv6(IpAddress address) {
+        checkNotNull(address, "Address cannot be null");
+
+        checkState(!(address.getIpv4Address() == null && address.getIpv6Address() == null), "Invalid address");
+        return address.getIpv6Address() != null;
+    }
+
+    /**
+     * Parse byte array returned by VPP representing an Ipv6 address. Vpp returns IP byte arrays in natural order.
+     *
+     * @return Ipv46ddressNoZone containing string representation of IPv6 address constructed from submitted bytes. No
+     * change in order.
+     */
+    @Nonnull
+    default Ipv6AddressNoZone arrayToIpv6AddressNoZoneReversed(@Nonnull byte[] ip) {
+        checkArgument(ip.length == 16, "Illegal array length");
+
+        ip = reverseBytes(ip);
+
+        try {
+            return new Ipv6AddressNoZone(InetAddresses.toAddrString(InetAddresses.fromLittleEndianByteArray(ip)));
+        } catch (UnknownHostException e) {
+            throw new IllegalArgumentException("Unable to parse ipv6", e);
+        }
+    }
+
+
+    /**
+     * Detects whether {@code IpPrefix} is ipv6
+     */
+    default boolean isIpv6(IpPrefix address) {
+        checkNotNull(address, "Address cannot be null");
+        checkState(!(address.getIpv4Prefix() == null && address.getIpv6Prefix() == null), "Invalid address");
+        return address.getIpv6Prefix() != null;
+    }
+}