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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.honeycomb.translate.v3po.interfaces.acl.common;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.function.BiFunction;
import javax.annotation.Nullable;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.PortNumber;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.packet.fields.rev160708.acl.transport.header.fields.DestinationPortRange;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.packet.fields.rev160708.acl.transport.header.fields.SourcePortRange;
/**
* Utility that produces cartesian product out of src and dst port ranges (used to translate ranges into
* list of classify sessions).
*/
final class PortPair {
private final Integer src;
private final Integer dst;
PortPair(@Nullable final Integer src, @Nullable final Integer dst) {
this.src = src;
this.dst = dst;
}
Integer getSrc() {
return src;
}
Integer getDst() {
return dst;
}
@Override
public String toString() {
return "(" + src + "," + dst + ")";
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final PortPair that = (PortPair) o;
if (!Objects.equals(src, that.src)) {
return false;
}
if (!Objects.equals(dst, that.dst)) {
return false;
}
return true;
}
@Override
public int hashCode() {
return Objects.hash(src, dst);
}
static List<PortPair> fromRange(final SourcePortRange srcRange,
final DestinationPortRange dstRange) {
final List<PortPair> result = new ArrayList<>();
if (srcRange == null && dstRange == null) {
result.add(new PortPair(null, null));
} else if (srcRange != null && dstRange == null) {
processSingleRange(result, srcRange.getLowerPort(), srcRange.getUpperPort(), PortPair::new);
} else if (srcRange == null && dstRange != null) {
processSingleRange(result, dstRange.getLowerPort(), dstRange.getUpperPort(),
(dst, src) -> new PortPair(src, dst));
} else {
processDoubleRange(result, srcRange, dstRange);
}
return result;
}
private static void processSingleRange(final List<PortPair> result,
final PortNumber lowerPort,
final PortNumber upperPort,
final BiFunction<Integer, Integer, PortPair> f) {
int low = lowerPort.getValue(); // mandatory
int hi = low;
if (upperPort != null) {
hi = upperPort.getValue();
}
for (; low <= hi; ++low) {
result.add(f.apply(low, null));
}
}
private static void processDoubleRange(final List<PortPair> result, final SourcePortRange srcRange,
final DestinationPortRange dstRange) {
int srcL = srcRange.getLowerPort().getValue();
int srcH = srcL;
if (srcRange.getUpperPort() != null) {
srcH = srcRange.getUpperPort().getValue();
}
int dstL = dstRange.getLowerPort().getValue();
int dstH = dstL;
if (dstRange.getUpperPort() != null) {
dstH = dstRange.getUpperPort().getValue();
}
for (int i=srcL; i <= srcH; ++i) {
for (int j=dstL; j <= dstH; ++j) {
result.add(new PortPair(i, j));
}
}
}
}
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