Introduce total row count on RowSetMetaData (#190)

* feat: introduce getRowsCount

---------

Signed-off-by: Rivaldi <[email protected]>

Author: cbot59

spring-batch-excel/src/main/java/org/springframework/batch/extensions/excel/support/rowset/DefaultRowSetMetaData.java

@@ -53,4 +53,9 @@ public String getSheetName() {
 		return this.sheet.getName();
 	}
 
+	@Override
+	public int getRowsCount() {
+		return this.sheet.getNumberOfRows();
+	}
+
 }

spring-batch-excel/src/main/java/org/springframework/batch/extensions/excel/support/rowset/RowSetMetaData.java

@@ -36,4 +36,12 @@ public interface RowSetMetaData {
 	 */
 	String getSheetName();
 
+	/**
+	 * Retrieves the number of available rows for the current sheet.
+	 * <p><strong>Note:</strong> The result might be indeterministic depending on the
+	 * {@code Sheet} implementation used in the {@code RowSetMetaData} implementation.
+	 * Some implementations may return an estimate or cached value rather than the exact count.
+	 * @return total rows
+	 */
+	int getRowsCount();
 }

spring-batch-excel/src/test/java/org/springframework/batch/extensions/excel/support/rowset/DefaultRowSetMetaDataTests.java

@@ -77,4 +77,16 @@ void shouldGetAndReturnNameOfTheSheet() {
 		verifyNoMoreInteractions(this.sheet);
 	}
 
+	@Test
+	void shouldReturnTotalAvailableRows() {
+
+		given(this.sheet.getNumberOfRows()).willReturn(1);
+
+		var rowsCount = this.rowSetMetaData.getRowsCount();
+
+		assertThat(rowsCount).isEqualTo(1);
+
+		verify(this.sheet, times(1)).getNumberOfRows();
+		verifyNoMoreInteractions(this.sheet);
+	}
 }

spring-batch-excel/src/test/java/org/springframework/batch/extensions/excel/support/rowset/DefaultRowSetTests.java

@@ -44,6 +44,11 @@ public String[] getColumnNames() {
 			public String getSheetName() {
 				return "Sheet1";
 			}
+
+			@Override
+			public int getRowsCount() {
+				return 1;
+			}
 		});
 	}