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/*
* 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.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.hc2vpp.v3po.interfaces.ip.Ipv4Writer;
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 implements Ipv4Writer {
/**
* 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 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) getSubnetMaskLength(
checkNotNull(((Netmask) subnet).getNetmask(), "No netmask defined for %s", subnet)
.getValue());
}
throw new IllegalArgumentException("Unsupported subnet : " + subnet);
};
}
}
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