[ONOS-3116] Port pair group implementation for SFC

Change-Id: I4dc8aa0c7e77e150ba45e4964ab00f36645e079c

+/*
+ * Copyright 2015 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.vtnrsc;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import java.util.List;
+import java.util.Objects;
+
+import com.google.common.collect.ImmutableList;
+
+/**
+ * Implementation of port pair group.
+ */
+public final class DefaultPortPairGroup implements PortPairGroup {
+
+    private final PortPairGroupId portPairGroupId;
+    private final TenantId tenantId;
+    private final String name;
+    private final String description;
+    private final List<PortPairId> portPairList;
+
+    /**
+     * Default constructor to create Port Pair Group.
+     *
+     * @param portPairGroupId port pair group id
+     * @param tenantId tenant id
+     * @param name name of port pair group
+     * @param description description of port pair group
+     * @param portPairList list of port pairs
+     */
+    private DefaultPortPairGroup(PortPairGroupId portPairGroupId, TenantId tenantId,
+                                 String name, String description,
+                                 List<PortPairId> portPairList) {
+
+        this.portPairGroupId = portPairGroupId;
+        this.tenantId = tenantId;
+        this.name = name;
+        this.description = description;
+        this.portPairList = portPairList;
+    }
+
+    @Override
+    public PortPairGroupId portPairGroupId() {
+        return portPairGroupId;
+    }
+
+    @Override
+    public TenantId tenantId() {
+        return tenantId;
+    }
+
+    @Override
+    public String name() {
+        return name;
+    }
+
+    @Override
+    public String description() {
+        return description;
+    }
+
+    @Override
+    public List<PortPairId> portPairs() {
+        return ImmutableList.copyOf(portPairList);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(portPairGroupId, tenantId, name, description,
+                            portPairList);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof DefaultPortPairGroup) {
+            DefaultPortPairGroup that = (DefaultPortPairGroup) obj;
+            return Objects.equals(portPairGroupId, that.portPairGroupId) &&
+                    Objects.equals(tenantId, that.tenantId) &&
+                    Objects.equals(name, that.name) &&
+                    Objects.equals(description, that.description) &&
+                    Objects.equals(portPairList, that.portPairList);
+        }
+        return false;
+    }
+
+    @Override
+    public boolean exactMatch(PortPairGroup portPairGroup) {
+        return this.equals(portPairGroup) &&
+                Objects.equals(this.portPairGroupId, portPairGroup.portPairGroupId()) &&
+                Objects.equals(this.tenantId, portPairGroup.tenantId());
+    }
+
+    @Override
+    public String toString() {
+        return toStringHelper(this)
+                .add("id", portPairGroupId.toString())
+                .add("tenantId", tenantId.toString())
+                .add("name", name)
+                .add("description", description)
+                .add("portPairGroupList", portPairList)
+                .toString();
+    }
+
+    /**
+     * To create an instance of the builder.
+     *
+     * @return instance of builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder class for Port pair group.
+     */
+    public static final class Builder implements PortPairGroup.Builder {
+
+        private PortPairGroupId portPairGroupId;
+        private TenantId tenantId;
+        private String name;
+        private String description;
+        private List<PortPairId> portPairList;
+
+        @Override
+        public Builder setId(PortPairGroupId portPairGroupId) {
+            this.portPairGroupId = portPairGroupId;
+            return this;
+        }
+
+        @Override
+        public Builder setTenantId(TenantId tenantId) {
+            this.tenantId = tenantId;
+            return this;
+        }
+
+        @Override
+        public Builder setName(String name) {
+            this.name = name;
+            return this;
+        }
+
+        @Override
+        public Builder setDescription(String description) {
+            this.description = description;
+            return this;
+        }
+
+        @Override
+        public Builder setPortPairs(List<PortPairId> portPairs) {
+            this.portPairList = portPairs;
+            return this;
+        }
+
+        @Override
+        public PortPairGroup build() {
+
+            checkNotNull(portPairGroupId, "Port pair group id cannot be null");
+            checkNotNull(tenantId, "Tenant id cannot be null");
+            checkNotNull(portPairList, "Port pairs cannot be null");
+
+            return new DefaultPortPairGroup(portPairGroupId, tenantId, name, description,
+                                            portPairList);
+        }
+    }
+}