Rename QueryResponse.job to jobId, better javadoc, no errors as empty…

… list, add hasErrors

gcloud-java-bigquery/src/main/java/com/google/gcloud/bigquery/QueryRequest.java

@@ -27,7 +27,7 @@
  * Google Cloud BigQuery Query Request. This class can be used to run a BigQuery SQL query and
  * return results if the query completes within a specified timeout. The query results are saved to
  * a temporary table that is deleted approximately 24 hours after the query is run. The query is run
- * through a BigQuery Job whose identity can be accessed via {@link QueryResponse#job()}.
+ * through a BigQuery Job whose identity can be accessed via {@link QueryResponse#jobId()}.
  *
  * @see <a href="https://cloud.google.com/bigquery/docs/reference/v2/jobs/query">Query</a>
  * @see <a href="https://cloud.google.com/bigquery/query-reference">Query Reference</a>

gcloud-java-bigquery/src/main/java/com/google/gcloud/bigquery/QueryResponse.java

@@ -17,6 +17,7 @@
 package com.google.gcloud.bigquery;
 
 import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableList;
 
 import java.io.Serializable;
 import java.util.List;
@@ -30,10 +31,11 @@
  * <pre>    {@code
  *    QueryResponse response = bigquery.query(request);
  *    while (!response.jobComplete()) {
- *      response = bigquery.getQueryResults(response.job());
+ *      response = bigquery.getQueryResults(response.jobId());
  *      Thread.sleep(1000);
  *    }
  *    List<BigQueryError> executionErrors = response.executionErrors();
+ *    // look for errors in executionErrors
  *    QueryResult result = response.result();
  *    Iterator<List<FieldValue>> rowIterator = result.iterateAll();
  *    while(rowIterator.hasNext()) {
@@ -52,15 +54,15 @@ public class QueryResponse implements Serializable {
 
   private final QueryResult result;
   private final String etag;
-  private final JobId job;
+  private final JobId jobId;
   private final boolean jobComplete;
   private final List<BigQueryError> executionErrors;
 
   static final class Builder {
 
     private QueryResult result;
     private String etag;
-    private JobId job;
+    private JobId jobId;
     private boolean jobComplete;
     private List<BigQueryError> executionErrors;
 
@@ -76,8 +78,8 @@ Builder etag(String etag) {
       return this;
     }
 
-    Builder job(JobId job) {
-      this.job = job;
+    Builder jobId(JobId jobId) {
+      this.jobId = jobId;
       return this;
     }
 
@@ -99,9 +101,10 @@ QueryResponse build() {
   private QueryResponse(Builder builder) {
     this.result = builder.result;
     this.etag = builder.etag;
-    this.job = builder.job;
+    this.jobId = builder.jobId;
     this.jobComplete = builder.jobComplete;
-    this.executionErrors = builder.executionErrors;
+    this.executionErrors = builder.executionErrors != null ? builder.executionErrors
+      : ImmutableList.<BigQueryError>of();
   }
 
   /**
@@ -123,8 +126,8 @@ public String etag() {
    * Returns the identity of the BigQuery Job that was created to run the query. This field will be
    * present even if the original request timed out.
    */
-  public JobId job() {
-    return job;
+  public JobId jobId() {
+    return jobId;
   }
 
   /**
@@ -137,6 +140,15 @@ public boolean jobComplete() {
     return jobComplete;
   }
 
+  /**
+   * Returns whether errors and warnings occurred during the execution of the job. If this method
+   * returns {@code true} it does not necessarily mean that the job has completed or was
+   * unsuccessful.
+   */
+  public boolean hasErrors() {
+    return !executionErrors.isEmpty();
+  }
+
   /**
    * Returns errors and warnings encountered during the running of the job, if any. Errors here do
    * not necessarily mean that the job has completed or was unsuccessful.
@@ -150,15 +162,15 @@ public String toString() {
     return MoreObjects.toStringHelper(this)
         .add("result", result)
         .add("etag", etag)
-        .add("job", job)
+        .add("jobId", jobId)
         .add("jobComplete", jobComplete)
         .add("executionErrors", executionErrors)
         .toString();
   }
 
   @Override
   public int hashCode() {
-    return Objects.hash(job);
+    return Objects.hash(jobId);
   }
 
   @Override
@@ -173,7 +185,7 @@ public boolean equals(Object obj) {
     return jobComplete == response.jobComplete
         && Objects.equals(etag, response.etag)
         && Objects.equals(result, response.result)
-        && Objects.equals(job, response.job)
+        && Objects.equals(jobId, response.jobId)
         && Objects.equals(executionErrors, response.executionErrors);
   }
 

gcloud-java-bigquery/src/main/java/com/google/gcloud/bigquery/QueryResult.java

@@ -72,17 +72,17 @@ Builder totalRows(long totalRows) {
     Builder pageFetcher(QueryResultsPageFetcher pageFetcher) {
       this.pageFetcher = pageFetcher;
       return this;
-    };
+    }
 
     Builder cursor(String cursor) {
       this.cursor = cursor;
       return this;
-    };
+    }
 
     Builder results(Iterable<List<FieldValue>> results) {
       this.results = results;
       return this;
-    };
+    }
 
     QueryResult build() {
       return new QueryResult(this);
@@ -108,7 +108,7 @@ public boolean cacheHit() {
   }
 
   /**
-   * Returns the schema of the results.
+   * Returns the schema of the results. This is present only when the query completes successfully.
    */
   public Schema schema() {
     return schema;

gcloud-java-bigquery/src/test/java/com/google/gcloud/bigquery/QueryResponseTest.java

@@ -19,6 +19,7 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
 
 import com.google.common.collect.ImmutableList;
 
@@ -62,7 +63,7 @@ public QueryResult nextPage() {
       .build();
   private static final QueryResponse QUERY_RESPONSE = QueryResponse.builder()
       .etag(ETAG)
-      .job(JOB_ID)
+      .jobId(JOB_ID)
       .jobComplete(JOB_COMPLETE)
       .executionErrors(ERRORS)
       .result(QUERY_RESULT)
@@ -72,19 +73,21 @@ public QueryResult nextPage() {
   public void testBuilder() {
     assertEquals(ETAG, QUERY_RESPONSE.etag());
     assertEquals(QUERY_RESULT, QUERY_RESPONSE.result());
-    assertEquals(JOB_ID, QUERY_RESPONSE.job());
+    assertEquals(JOB_ID, QUERY_RESPONSE.jobId());
     assertEquals(JOB_COMPLETE, QUERY_RESPONSE.jobComplete());
     assertEquals(ERRORS, QUERY_RESPONSE.executionErrors());
+    assertTrue(QUERY_RESPONSE.hasErrors());
   }
 
   @Test
   public void testBuilderIncomplete() {
     QueryResponse queryResponse = QueryResponse.builder().jobComplete(false).build();
     assertNull(queryResponse.etag());
     assertNull(queryResponse.result());
-    assertNull(queryResponse.job());
+    assertNull(queryResponse.jobId());
     assertFalse(queryResponse.jobComplete());
-    assertNull(queryResponse.executionErrors());
+    assertEquals(ImmutableList.<BigQueryError>of(), queryResponse.executionErrors());
+    assertFalse(queryResponse.hasErrors());
   }
 
   @Test
@@ -96,8 +99,9 @@ private void compareQueryResponse(QueryResponse expected, QueryResponse value) {
     assertEquals(expected, value);
     assertEquals(expected.etag(), value.etag());
     assertEquals(expected.result(), value.result());
-    assertEquals(expected.job(), value.job());
+    assertEquals(expected.jobId(), value.jobId());
     assertEquals(expected.jobComplete(), value.jobComplete());
     assertEquals(expected.executionErrors(), value.executionErrors());
+    assertEquals(expected.hasErrors(), value.hasErrors());
   }
 }

gcloud-java-bigquery/src/test/java/com/google/gcloud/bigquery/SerializationTest.java

@@ -203,7 +203,7 @@ public class SerializationTest {
       .build();
   private static final QueryResponse QUERY_RESPONSE = QueryResponse.builder()
       .etag(ETAG)
-      .job(JOB_ID)
+      .jobId(JOB_ID)
       .jobComplete(true)
       .result(QUERY_RESULT)
       .build();