Add unit test for TrafficSelector Codec

Change-Id: Ibe84ce7955c40c20b3ed94482e0bebe6be28032e

+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * 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 org.onosproject.codec.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.ImmutableSet;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.packet.Ethernet;
+import org.onlab.packet.MacAddress;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.flow.DefaultTrafficSelector;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.flow.criteria.Criteria;
+import org.onosproject.net.flow.criteria.Criterion;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Set;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+
+/**
+ * Unit tests for traffic selector codec.
+ */
+public class TrafficSelectorCodecTest {
+
+    private MockCodecContext context;
+    private JsonCodec<TrafficSelector> trafficSelectorCodec;
+
+    @Before
+    public void setUp() {
+        context = new MockCodecContext();
+        trafficSelectorCodec = context.codec(TrafficSelector.class);
+        assertThat(trafficSelectorCodec, notNullValue());
+    }
+
+    /**
+     * Tests encoding of a traffic selector object.
+     */
+    @Test
+    public void testTrafficSelectorEncode() {
+
+        Criterion inPort = Criteria.matchInPort(PortNumber.portNumber(0));
+        Criterion ethSrc = Criteria.matchEthSrc(MacAddress.valueOf("11:22:33:44:55:66"));
+        Criterion ethDst = Criteria.matchEthDst(MacAddress.valueOf("44:55:66:77:88:99"));
+        Criterion ethType = Criteria.matchEthType(Ethernet.TYPE_IPV4);
+
+        TrafficSelector.Builder sBuilder = DefaultTrafficSelector.builder();
+        TrafficSelector selector = sBuilder
+                .add(inPort)
+                .add(ethSrc)
+                .add(ethDst)
+                .add(ethType)
+                .build();
+
+        ObjectNode selectorJson = trafficSelectorCodec.encode(selector, context);
+        assertThat(selectorJson, TrafficSelectorJsonMatcher.matchesTrafficSelector(selector));
+    }
+
+    /**
+     * Tests decoding of a traffic selector JSON object.
+     */
+    @Test
+    public void testTrafficSelectorDecode() throws IOException {
+        TrafficSelector selector = getSelector("TrafficSelector.json");
+
+        Set<Criterion> criteria = selector.criteria();
+        assertThat(criteria.size(), is(4));
+
+        ImmutableSet<String> types = ImmutableSet.of("IN_PORT", "ETH_SRC", "ETH_DST", "ETH_TYPE");
+
+        criteria.forEach(c -> assertThat(types.contains(c.type().name()), is(true)));
+    }
+
+    public static final class TrafficSelectorJsonMatcher
+            extends TypeSafeDiagnosingMatcher<JsonNode> {
+        private final TrafficSelector trafficSelector;
+
+        private TrafficSelectorJsonMatcher(TrafficSelector trafficSelector) {
+            this.trafficSelector = trafficSelector;
+        }
+
+        @Override
+        protected boolean matchesSafely(JsonNode jsonNode, Description description) {
+            // check size of criteria
+            JsonNode jsonCriteria = jsonNode.get("criteria");
+            if (jsonCriteria.size() != trafficSelector.criteria().size()) {
+                description.appendText("criteria size was " + jsonCriteria.size());
+                return false;
+            }
+
+            // check criteria
+            for (Criterion criterion : trafficSelector.criteria()) {
+                boolean criterionFound = false;
+                for (int criterionIndex = 0; criterionIndex < jsonCriteria.size(); criterionIndex++) {
+                    CriterionJsonMatcher criterionMatcher = CriterionJsonMatcher.matchesCriterion(criterion);
+                    if (criterionMatcher.matches(jsonCriteria.get(criterionIndex))) {
+                        criterionFound = true;
+                        break;
+                    }
+                }
+
+                if (!criterionFound) {
+                    description.appendText("criterion not found " + criterion.toString());
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(trafficSelector.toString());
+        }
+
+        /**
+         * Factory to allocate a traffic selector matcher.
+         *
+         * @param selector traffic selector object we are looking for
+         * @return matcher
+         */
+        static TrafficSelectorJsonMatcher matchesTrafficSelector(TrafficSelector selector) {
+            return new TrafficSelectorJsonMatcher(selector);
+        }
+    }
+
+    /**
+     * Reads in a traffic selector from the given resource and decodes it.
+     *
+     * @param resourceName resource to use to read the JSON for the rule
+     * @return decoded trafficSelector
+     * @throws IOException if processing the resource fails
+     */
+    private TrafficSelector getSelector(String resourceName) throws IOException {
+        InputStream jsonStream = TrafficSelectorCodecTest.class.getResourceAsStream(resourceName);
+        JsonNode json = context.mapper().readTree(jsonStream);
+        assertThat(json, notNullValue());
+        TrafficSelector selector = trafficSelectorCodec.decode((ObjectNode) json, context);
+        assertThat(selector, notNullValue());
+        return selector;
+    }
+}

+{
+  "criteria": [
+    {
+      "type": "IN_PORT",
+      "port": -3
+    },
+    {
+      "type": "ETH_SRC",
+      "mac": "11:22:33:44:55:66"
+    },
+    {
+      "type": "ETH_DST",
+      "mac": "44:55:66:77:88:99"
+    },
+    {
+      "type": "ETH_TYPE",
+      "ethType": 2054
+    }
+  ]
+}
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