Add tests for GRIB2 PDS 40

grib/src/main/java/ucar/nc2/grib/grib2/Grib2Pds.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998-2018 John Caron and University Corporation for Atmospheric Research/Unidata
+ * Copyright (c) 1998-2026 John Caron and University Corporation for Atmospheric Research/Unidata
  * See LICENSE for license information.
  */
 

grib/src/test/java/ucar/nc2/grib/grib2/TestPds40.java

@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2026 University Corporation for Atmospheric Research/Unidata
+ * See LICENSE for license information.
+ */
+
+package ucar.nc2.grib.grib2;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.IOException;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/**
+ * Test data from github issue https://github.com/Unidata/netcdf-java/pull/1568
+ * Data was used to create a .gbx9 file for testing.
+ * <p>
+ * PDS (Secton 4) output from ecCodes grib_dump at the end of the file, uses as a basis for
+ * testing PDS (Secton 4) parsing
+ */
+@RunWith(JUnit4.class)
+public class TestPds40 {
+
+  private Grib2Pds pds;
+
+  @Before
+  public void openTestFile() throws IOException {
+    String testfile = "../grib/src/test/data/index/kenda-ch1-202606181100-0-poacsnc-ctrl.grib2.gbx9";
+
+    Grib2Index gi = new Grib2Index();
+    boolean success = gi.readIndex(testfile, -1);
+    assertThat(success).isTrue();
+    List<Grib2Record> records = gi.getRecords();
+    Grib2Record record = records.get(0);
+    pds = record.getPDS();
+  }
+
+  @Test
+  public void testPdsBasic() {
+    assertThat(pds.getRawLength()).isEqualTo(60);
+    assertThat(pds.getTemplateNumber()).isEqualTo(40);
+  }
+
+  // check overrides
+  @Test
+  public void testGenProcessType() {
+    assertThat(pds.getGenProcessType()).isEqualTo(2);;
+  }
+
+  @Test
+  public void testBackProcessId() {
+    assertThat(pds.getBackProcessId()).isEqualTo(0);;
+  }
+
+  @Test
+  public void testGenProcessId() {
+    assertThat(pds.getGenProcessId()).isEqualTo(151);;
+  }
+
+  @Test
+  public void testTimeUnit() {
+    assertThat(pds.getTimeUnit()).isEqualTo(0);
+  }
+
+  @Test
+  public void testLevelType1() {
+    assertThat(pds.getLevelType1()).isEqualTo(150);
+  }
+
+  @Test
+  public void testLevelScale1() {
+    assertThat(pds.getLevelScale1()).isEqualTo(0);
+  }
+
+  @Test
+  public void testLevelValue1() {
+    assertThat(pds.getLevelValue1()).isEqualTo(80);
+  }
+
+  @Test
+  public void testLevelType2() {
+    assertThat(pds.getLevelType2()).isEqualTo(150);
+  }
+
+  @Test
+  public void testLevelScale2() {
+    assertThat(pds.getLevelScale2()).isEqualTo(0);
+  }
+
+  @Test
+  public void testLevelValue2() {
+    assertThat(pds.getLevelValue2()).isEqualTo(81);
+  }
+
+  @Test
+  public void testTemplateLength() {
+    assertThat(pds.templateLength()).isEqualTo(36);
+  }
+}
+
+// grib_dump -O kenda-ch1-202606181100-0-poacsnc-ctrl.grib2
+// ***** FILE: kenda-ch1-202606181100-0-poacsnc-ctrl.grib2
+// ...
+// ====================== SECTION_4 ( length=60, padding=0 ) ======================
+// 1-4 section4Length = 60
+// 5 numberOfSection = 4
+// 6-7 NV = 6
+// 8-9 productDefinitionTemplateNumber = 40 [Analysis or forecast at a horizontal level or in a horizontal layer at a
+// point in time for atmospheric chemical constituents (grib2/tables/15/4.0.table) ]
+// 10 parameterCategory = 20 [Atmospheric chemical constituents (grib2/tables/15/4.1.0.table) ]
+// 11 parameterNumber = 60 [Unknown code table entry (grib2/tables/15/4.2.0.20.table) ]
+// 12-13 constituentType = 62300 [Unknown code table entry (grib2/tables/15/4.230.table) ]
+// 14 typeOfGeneratingProcess = 2 [Forecast (grib2/tables/15/4.3.table) ]
+// 15 backgroundProcess = 0
+// 16 generatingProcessIdentifier = 151
+// 17-18 hoursAfterDataCutoff = 0
+// 19 minutesAfterDataCutoff = 0
+// 20 indicatorOfUnitForForecastTime = 0 [Minute (grib2/tables/15/4.4.table) ]
+// 21-24 forecastTime = 0
+// 25 typeOfFirstFixedSurface = 150 [Generalized vertical height coordinate (grib2/tables/15/4.5.table) ]
+// 26 scaleFactorOfFirstFixedSurface = 0
+// 27-30 scaledValueOfFirstFixedSurface = 80
+// 31 typeOfSecondFixedSurface = 150 [Generalized vertical height coordinate (grib2/tables/15/4.5.table) ]
+// 32 scaleFactorOfSecondFixedSurface = 0
+// 33-36 scaledValueOfSecondFixedSurface = 81
+// 37-40 nlev = 81
+// 41-44 numberOfVGridUsed = 4
+// 45-60 uuidOfVGrid = 16 {
+// 6f, a9, e9, b5, 8a, d4, 5b, 2a, 94, 7c, 0e, 86, aa, db, 2d, e0
+// } # bytes uuidOfVGrid