Enable mocking of functional classes and configurations

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/BigQueryError.java

@@ -17,7 +17,7 @@
  * {@link BigQueryException} is thrown the BigQuery Error that caused it, if any, can be accessed
  * with {@link BigQueryException#error()}.
  */
-public class BigQueryError implements Serializable {
+public final class BigQueryError implements Serializable {
 
   static final Function<ErrorProto, BigQueryError> FROM_PB_FUNCTION =
       new Function<ErrorProto, BigQueryError>() {
@@ -98,7 +98,9 @@ public String toString() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof BigQueryError && Objects.equals(toPb(), ((BigQueryError) obj).toPb());
+    return obj == this
+        || obj instanceof BigQueryError
+        && Objects.equals(toPb(), ((BigQueryError) obj).toPb());
   }
 
   ErrorProto toPb() {

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/CopyJobConfiguration.java

@@ -181,7 +181,9 @@ ToStringHelper toStringHelper() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof CopyJobConfiguration && baseEquals((CopyJobConfiguration) obj);
+    return obj == this
+        || obj instanceof CopyJobConfiguration
+        && baseEquals((CopyJobConfiguration) obj);
   }
 
   @Override

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/CsvOptions.java

@@ -25,7 +25,7 @@
  * Google BigQuery options for CSV format. This class wraps some properties of CSV files used by
  * BigQuery to parse external data.
  */
-public class CsvOptions extends FormatOptions {
+public final class CsvOptions extends FormatOptions {
 
   private static final long serialVersionUID = 2193570529308612708L;
 
@@ -224,7 +224,9 @@ public int hashCode() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof CsvOptions && Objects.equals(toPb(), ((CsvOptions) obj).toPb());
+    return obj == this
+        || obj instanceof CsvOptions
+        && Objects.equals(toPb(), ((CsvOptions) obj).toPb());
   }
 
   com.google.api.services.bigquery.model.CsvOptions toPb() {

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/Dataset.java

@@ -34,7 +34,7 @@
  * {@link DatasetInfo}.
  * </p>
  */
-public final class Dataset extends DatasetInfo {
+public class Dataset extends DatasetInfo {
 
   private static final long serialVersionUID = -4272921483363065593L;
 
@@ -230,14 +230,20 @@ public Builder toBuilder() {
   }
 
   @Override
-  public boolean equals(Object obj) {
-    return obj instanceof Dataset
-        && Objects.equals(toPb(), ((Dataset) obj).toPb())
-        && Objects.equals(options, ((Dataset) obj).options);
+  public final boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (obj == null || !obj.getClass().equals(Dataset.class)) {
+      return false;
+    }
+    Dataset other = (Dataset) obj;
+    return Objects.equals(toPb(), other.toPb())
+        && Objects.equals(options, other.options);
   }
 
   @Override
-  public int hashCode() {
+  public final int hashCode() {
     return Objects.hash(super.hashCode(), options);
   }
 

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/DatasetId.java

@@ -26,7 +26,7 @@
 /**
  * Google BigQuery Dataset identity.
  */
-public class DatasetId implements Serializable {
+public final class DatasetId implements Serializable {
 
   private static final long serialVersionUID = -6186254820908152300L;
 
@@ -68,7 +68,9 @@ public static DatasetId of(String dataset) {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof DatasetId && Objects.equals(toPb(), ((DatasetId) obj).toPb());
+    return obj == this
+        || obj instanceof DatasetId
+        && Objects.equals(toPb(), ((DatasetId) obj).toPb());
   }
 
   @Override

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/DatasetInfo.java

@@ -395,7 +395,8 @@ public int hashCode() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj != null
+    return obj == this
+        || obj != null
         && obj.getClass().equals(DatasetInfo.class)
         && Objects.equals(toPb(), ((DatasetInfo) obj).toPb());
   }

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/ExternalTableDefinition.java

@@ -255,12 +255,15 @@ ToStringHelper toStringHelper() {
   }
 
   @Override
-  public boolean equals(Object obj) {
-    return obj instanceof ExternalTableDefinition && baseEquals((ExternalTableDefinition) obj);
+  public final boolean equals(Object obj) {
+    return obj == this
+        || obj != null
+        && obj.getClass().equals(ExternalTableDefinition.class)
+        && baseEquals((ExternalTableDefinition) obj);
   }
 
   @Override
-  public int hashCode() {
+  public final int hashCode() {
     return Objects.hash(baseHashCode(), compression, ignoreUnknownValues, maxBadRecords,
         formatOptions, sourceUris);
   }

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/ExtractJobConfiguration.java

@@ -211,7 +211,9 @@ ToStringHelper toStringHelper() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof ExtractJobConfiguration && baseEquals((ExtractJobConfiguration) obj);
+    return obj == this
+        || obj instanceof ExtractJobConfiguration
+        && baseEquals((ExtractJobConfiguration) obj);
   }
 
   @Override

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/Field.java

@@ -32,12 +32,12 @@
 import java.util.Objects;
 
 /**
- * Google BigQuery Table field. A table field has a name, a value, a mode and possibly a
- * description. Supported types are: {@link Type#integer()}, {@link Type#bool()},
- * {@link Type#string()}, {@link Type#floatingPoint()}, {@link Type#timestamp()} and
- * {@link Type#record(Field...)}. One or more fields form a table's schema.
+ * Google BigQuery Table field. A table field has a name, a type, a mode and possibly a description.
+ * Supported types are: {@link Type#integer()}, {@link Type#bool()}, {@link Type#string()},
+ * {@link Type#floatingPoint()}, {@link Type#timestamp()} and {@link Type#record(Field...)}. One or
+ * more fields form a table's schema.
  */
-public class Field implements Serializable {
+public final class Field implements Serializable {
 
   static final Function<TableFieldSchema, Field> FROM_PB_FUNCTION =
       new Function<TableFieldSchema, Field>() {
@@ -56,6 +56,11 @@ public TableFieldSchema apply(Field field) {
 
   private static final long serialVersionUID = -8154262932305199256L;
 
+  private final String name;
+  private final Type type;
+  private final String mode;
+  private final String description;
+
   /**
    * Data Types for a BigQuery Table field. This class provides factory methods for all BigQuery
    * field types. To instantiate a RECORD value the list of sub-fields must be provided.
@@ -185,11 +190,6 @@ public enum Mode {
     NULLABLE, REQUIRED, REPEATED
   }
 
-  private final String name;
-  private final Type type;
-  private final String mode;
-  private final String description;
-
   public static final class Builder {
 
     private String name;

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/FieldValue.java

@@ -216,13 +216,16 @@ public String toString() {
   }
 
   @Override
-  public int hashCode() {
+  public final int hashCode() {
     return Objects.hash(attribute, value);
   }
 
   @Override
-  public boolean equals(Object obj) {
-    if (!(obj instanceof FieldValue)) {
+  public final boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (obj == null || !obj.getClass().equals(FieldValue.class)) {
       return false;
     }
     FieldValue other = (FieldValue) obj;

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/FormatOptions.java

@@ -59,7 +59,10 @@ public int hashCode() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof FormatOptions && Objects.equals(type, ((FormatOptions) obj).type());
+    return obj == this
+        || obj != null
+        && obj.getClass().equals(FormatOptions.class)
+        && Objects.equals(type, ((FormatOptions) obj).type());
   }
 
   /**

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/InsertAllRequest.java

@@ -37,7 +37,7 @@
  * @see <a href="https://cloud.google.com/bigquery/streaming-data-into-bigquery">Streaming Data into
  *     BigQuery</a>
  */
-public class InsertAllRequest implements Serializable {
+public final class InsertAllRequest implements Serializable {
 
   private static final long serialVersionUID = 211200307773853078L;
 
@@ -443,6 +443,9 @@ public int hashCode() {
 
   @Override
   public boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
     if (!(obj instanceof InsertAllRequest)) {
       return false;
     }

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/InsertAllResponse.java

@@ -74,13 +74,15 @@ public boolean hasErrors() {
   }
 
   @Override
-  public int hashCode() {
+  public final int hashCode() {
     return Objects.hash(insertErrors);
   }
 
   @Override
-  public boolean equals(Object obj) {
-    return obj instanceof InsertAllResponse
+  public final boolean equals(Object obj) {
+    return obj == this
+        || obj != null
+        && obj.getClass().equals(InsertAllResponse.class)
         && Objects.equals(insertErrors, ((InsertAllResponse) obj).insertErrors);
   }
 

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/Job.java

@@ -30,7 +30,7 @@
  * {@link JobInfo}.
  * </p>
  */
-public final class Job extends JobInfo {
+public class Job extends JobInfo {
 
   private static final long serialVersionUID = -4324100991693024704L;
 
@@ -178,14 +178,20 @@ public Builder toBuilder() {
   }
 
   @Override
-  public boolean equals(Object obj) {
-    return obj instanceof Job
-        && Objects.equals(toPb(), ((Job) obj).toPb())
-        && Objects.equals(options, ((Job) obj).options);
+  public final boolean equals(Object obj) {
+    if (obj == this) {
+      return true;
+    }
+    if (obj == null || !obj.getClass().equals(Job.class)) {
+      return false;
+    }
+    Job other = (Job) obj;
+    return Objects.equals(toPb(), other.toPb())
+        && Objects.equals(options, other.options);
   }
 
   @Override
-  public int hashCode() {
+  public final int hashCode() {
     return Objects.hash(super.hashCode(), options);
   }
 

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/JobId.java

@@ -26,7 +26,7 @@
 /**
  * Google BigQuery Job identity.
  */
-public class JobId implements Serializable {
+public final class JobId implements Serializable {
 
   private static final long serialVersionUID = 1225914835379688976L;
 
@@ -68,7 +68,9 @@ public static JobId of(String job) {
 
   @Override
   public boolean equals(Object obj) {
-    return obj instanceof JobId && Objects.equals(toPb(), ((JobId) obj).toPb());
+    return obj == this
+        || obj instanceof JobId
+        && Objects.equals(toPb(), ((JobId) obj).toPb());
   }
 
   @Override

gcloud-java-bigquery/src/main/java/com/google/cloud/bigquery/JobInfo.java

@@ -319,7 +319,8 @@ public int hashCode() {
 
   @Override
   public boolean equals(Object obj) {
-    return obj != null
+    return obj == this
+        || obj != null
         && obj.getClass().equals(JobInfo.class)
         && Objects.equals(toPb(), ((JobInfo) obj).toPb());
   }