1 files changed, 126 insertions, 0 deletions
diff --git a/vpp-classifier/impl/src/main/java/io/fd/hc2vpp/vpp/classifier/write/acl/common/PortPair.java b/vpp-classifier/impl/src/main/java/io/fd/hc2vpp/vpp/classifier/write/acl/common/PortPair.java
new file mode 100644
index 000000000..339102117
--- /dev/null
+++ b/vpp-classifier/impl/src/main/java/io/fd/hc2vpp/vpp/classifier/write/acl/common/PortPair.java
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2017 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.vpp.classifier.write.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));
+            }
+        }
+    }
+}