WIP

Author: stijn-dejongh

dsl/src/main/java/be/sddevelopment/validation/dsl/CsvFile.java

@@ -1,14 +1,18 @@
 package be.sddevelopment.validation.dsl;
 
 import java.nio.file.Path;
+import java.util.List;
 import java.util.Vector;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 public record CsvFile (
     String fileIdentifier,
     Vector<String> headerFields,
     Vector<Vector<String>> lines
 ) {
+    private static final String DEFAULT = ".*\\.csv";
+
     public CsvFile {
         if (headerFields == null || lines == null) {
             throw new IllegalArgumentException("Header fields and lines must not be null");
@@ -19,11 +23,29 @@ public Vector<String> line(int lineNumber) {
         return lines.get(lineNumber);
     }
 
-    public static CsvFile fromLines(Stream<String> lines) {
+    public static CsvFile fromLines(List<String> lines) {
+        if(lines.isEmpty()) {
+            throw new IllegalArgumentException("No lines provided. A data file requires at least one line");
+        }
+
+        var header = parseHeader(lines.getFirst());
+        var dataLines = lines.stream().skip(1).map(CsvFile::parseLine).toList();
+        return new CsvFile(DEFAULT, header, new Vector<>(dataLines));
+    }
+
+    private static Vector<String> parseHeader(String s) {
+        return null;
+    }
+
+    private static Vector<String> parseLine(String s) {
         return null;
     }
 
     public static CsvFile fromFile(Path dataFile) {
         return null;
     }
+
+    public boolean isEmpty() {
+        return this.lines.isEmpty();
+    }
 }

dsl/src/test/java/be/sddevelopment/validation/dsl/CsvFileTest.java

@@ -4,28 +4,56 @@
 import org.assertj.core.api.WithAssertions;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.DisplayNameGeneration;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
+import java.util.List;
+
 @DisplayName("Comma Separated Values File")
 @DisplayNameGeneration(ReplaceUnderscoredCamelCasing.class)
 class CsvFileTest implements WithAssertions {
 
-    @Test
-    void canBeCreatedFromLines() {
-        var dataWithHeader = """
+    @Nested
+    class LineBasedParsing {
+
+        @Test
+        void dataIsAccessibleAfterParsing() {
+            var dataWithHeader = """
             NAME,HEIGHT,SPECIES
             Luke Skywalker,172,Human
             C-3PO,167,Droid
             R2-D2,96,Droid
             Boba Fett,183, Human
         """;
 
-        var csvFile = CsvFile.fromLines(dataWithHeader.lines());
+            var csvFile = CsvFile.fromLines(dataWithHeader.lines().toList());
+
+            assertThat(csvFile).isNotNull()
+                    .extracting(CsvFile::headerFields)
+                    .asInstanceOf(LIST)
+                    .containsExactly("NAME", "HEIGHT", "SPECIES");
+            assertThat(csvFile.line(0)).containsExactly("Luke Skywalker", "172", "Human");
+        }
+
+        @Test
+        void parsingRequiresAtLeastAHeaderLine() {
+            assertThatException().isThrownBy(() -> CsvFile.fromLines(List.of()))
+                    .isInstanceOf(IllegalArgumentException.class)
+                    .withMessage("No lines provided. A data file requires at least one line")
+                    .withNoCause();
+        }
+
+        @Test
+        void canHandleEmptyDataSets() {
+            var headerOnly = List.of("NAME,HEIGHT,SPECIES");
+
+            var csvFile = CsvFile.fromLines(headerOnly);
 
-        assertThat(csvFile).isNotNull()
-                .extracting(CsvFile::headerFields)
-                .asInstanceOf(LIST)
-                .containsExactly("NAME", "HEIGHT", "SPECIES");
-        assertThat(csvFile.line(0)).containsExactly("Luke Skywalker", "172", "Human");
+            assertThat(csvFile).isNotNull();
+            assertThat(csvFile.headerFields())
+                    .asInstanceOf(LIST)
+                    .containsExactly("NAME", "HEIGHT", "SPECIES");
+            assertThat(csvFile).matches(CsvFile::isEmpty);
+        }
     }
 }

dsl/src/test/java/be/sddevelopment/validation/dsl/FileValidatorParserTest.java

@@ -62,7 +62,7 @@ void canCheckFieldExistence() {
                     C-3PO,167,Droid
                     R2-D2,96,Droid
                     Boba Fett,183, Human
-                    """.lines()
+                    """.lines().toList()
             );
             var rule = "FieldExists('HOMEWORLD')";
             var ruleAdder = FileValidatorParser.<CsvFile>toRuleAdder(rule);

pom.xml

@@ -60,7 +60,7 @@
     <sonar.projectKey>sddevelopment_modular-validators</sonar.projectKey>
     <sonar.coverage.jacoco.xmlReportPaths>${jacoco.build.dir}/jacoco.xml</sonar.coverage.jacoco.xmlReportPaths>
 
-    <code.utils.version>1.0.0-SNAPSHOT</code.utils.version>
+    <code.utils.version>1.0.0</code.utils.version>
     <rewrite.version>5.36.0</rewrite.version>
   </properties>
   <dependencyManagement>