ONOS-7066 ONOS-7067 PI abstractions refactoring and P4Info model parser

Includes changes previously reviewed in #15607, #15877, and #15955.

Change-Id: Ie2ff62e415f2099832ebfe05961a879b7b188fc3
diff --git a/core/api/src/test/java/org/onosproject/net/pi/runtime/PiMatchFieldIdTest.java b/core/api/src/test/java/org/onosproject/net/pi/runtime/PiMatchFieldIdTest.java
new file mode 100644
index 0000000..2724da0
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/net/pi/runtime/PiMatchFieldIdTest.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.net.pi.runtime;
+
+import com.google.common.testing.EqualsTester;
+import org.junit.Test;
+import org.onosproject.net.pi.model.PiMatchFieldId;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onlab.junit.ImmutableClassChecker.assertThatClassIsImmutable;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.DOT;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.DST_ADDR;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.ETH_HEADER_NAME;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.ETH_TYPE;
+import static org.onosproject.net.pi.runtime.PiConstantsTest.IPV4_HEADER_NAME;
+
+/**
+ * Unit tests for PiMatchFieldId class.
+ */
+public class PiMatchFieldIdTest {
+    private final String headerName = ETH_HEADER_NAME;
+    private final String dstAddr = DST_ADDR;
+    private final String etherType = ETH_TYPE;
+
+    private final PiMatchFieldId piMatchFieldId1 = PiMatchFieldId.of(headerName + DOT + dstAddr);
+    private final PiMatchFieldId sameAsPiMatchFieldId1 = PiMatchFieldId.of(headerName + DOT + dstAddr);
+    private final PiMatchFieldId piMatchFieldId2 = PiMatchFieldId.of(headerName + DOT + etherType);
+
+    private int index = 10;
+    private final PiMatchFieldId piMatchFieldId1WithIndex = PiMatchFieldId
+            .of(headerName + DOT + dstAddr + "[" + index + "]");
+    private final PiMatchFieldId sameAsPiMatchFieldId1WithIndex = PiMatchFieldId
+            .of(headerName + DOT + dstAddr + "[" + index + "]");
+    private final PiMatchFieldId piMatchFieldId2WithIndex = PiMatchFieldId
+            .of(headerName + DOT + etherType + "[" + index + "]");
+
+    /**
+     * Checks that the PiMatchFieldId class is immutable.
+     */
+    @Test
+    public void testImmutability() {
+        assertThatClassIsImmutable(PiMatchFieldId.class);
+    }
+
+    /**
+     * Checks the operation of equals(), hashCode() and toString() methods.
+     */
+    @Test
+    public void testEquals() {
+        new EqualsTester()
+                .addEqualityGroup(piMatchFieldId1, sameAsPiMatchFieldId1)
+                .addEqualityGroup(piMatchFieldId2)
+                .testEquals();
+    }
+
+    /**
+     * Checks the operation of equals(), hashCode() and toString() methods.
+     */
+    @Test
+    public void testEqualsWithIndex() {
+        new EqualsTester()
+                .addEqualityGroup(piMatchFieldId1WithIndex, sameAsPiMatchFieldId1WithIndex)
+                .addEqualityGroup(piMatchFieldId2WithIndex)
+                .testEquals();
+    }
+
+    /**
+     * Checks the construction of a PiMatchFieldId object.
+     */
+    @Test
+    public void testConstruction() {
+        final String name = IPV4_HEADER_NAME  + DOT + DST_ADDR;
+        final PiMatchFieldId piMatchFieldId = PiMatchFieldId.of(name);
+        assertThat(piMatchFieldId, is(notNullValue()));
+        assertThat(piMatchFieldId.id(), is(name));
+    }
+
+    /**
+     * Checks the construction of a PiMatchFieldId object with index.
+     */
+    @Test
+    public void testConstructionWithIndex() {
+        final String name = IPV4_HEADER_NAME + DOT + DST_ADDR + "[1]";
+        final PiMatchFieldId piMatchFieldId = PiMatchFieldId.of(name);
+        assertThat(piMatchFieldId, is(notNullValue()));
+        assertThat(piMatchFieldId.id(), is(name));
+    }
+}