Merge pull request #195 from mP1/feature/TextMatch-implements-CanBeEmpty

TextMatch implements CanBeEmpty
mP1 · Nov 12, 2024 · 2e22dcf · 2e22dcf
2 parents 67de421 + c27c327
commit 2e22dcf
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Showing 2 changed files with 67 additions and 2 deletions.
diff --git a/src/main/java/walkingkooka/spreadsheet/expression/function/TextMatch.java b/src/main/java/walkingkooka/spreadsheet/expression/function/TextMatch.java
@@ -17,6 +17,7 @@
 
 package walkingkooka.spreadsheet.expression.function;
 
+import walkingkooka.CanBeEmpty;
 import walkingkooka.Value;
 import walkingkooka.predicate.Predicates;
 import walkingkooka.text.CaseSensitivity;
@@ -30,7 +31,8 @@
  */
 public final class TextMatch implements Value<String>,
         Predicate<CharSequence>,
-        HasCaseSensitivity {
+        HasCaseSensitivity,
+        CanBeEmpty {
 
     public static TextMatch parse(final String text) {
         Objects.requireNonNull(text, "text");
@@ -65,6 +67,17 @@ public CaseSensitivity caseSensitivity() {
 
     private final static CaseSensitivity CASE_SENSITIVITY = CaseSensitivity.INSENSITIVE;
 
+    // CanBeEmpty.......................................................................................................
+
+    /**
+     * A {@link TextMatch} is empty if it is only whitespace and has no actual glob pattern(s).
+     */
+    @Override
+    public boolean isEmpty() {
+        return this.text.trim()
+                .isEmpty();
+    }
+
     // Predicate........................................................................................................
 
     @Override

diff --git a/src/test/java/walkingkooka/spreadsheet/expression/function/TextMatchTest.java b/src/test/java/walkingkooka/spreadsheet/expression/function/TextMatchTest.java
@@ -18,6 +18,7 @@
 package walkingkooka.spreadsheet.expression.function;
 
 import org.junit.jupiter.api.Test;
+import walkingkooka.CanBeEmptyTesting;
 import walkingkooka.HashCodeEqualsDefinedTesting2;
 import walkingkooka.predicate.PredicateTesting2;
 import walkingkooka.test.ParseStringTesting;
@@ -26,7 +27,8 @@
 
 public final class TextMatchTest implements ParseStringTesting<TextMatch>,
         PredicateTesting2<TextMatch, CharSequence>,
-        HashCodeEqualsDefinedTesting2<TextMatch> {
+        HashCodeEqualsDefinedTesting2<TextMatch>,
+        CanBeEmptyTesting {
 
     // with.............................................................................................................
 
@@ -77,6 +79,56 @@ public RuntimeException parseStringFailedExpected(final RuntimeException thrown)
         return thrown;
     }
 
+    // isEmpty..........................................................................................................
+
+    @Test
+    public void testIsEmptyWhenEmptyString() {
+        this.isEmptyAndCheck(
+                "",
+                true
+        );
+    }
+
+    @Test
+    public void testIsEmptyWhenNotEmptyWhitespaceOnlyString() {
+        this.isEmptyAndCheck(
+                " ",
+                true
+        );
+    }
+
+    @Test
+    public void testIsEmptyWhenNotEmptyWhitespaceOnlyString2() {
+        this.isEmptyAndCheck(
+                "  ",
+                true
+        );
+    }
+
+    @Test
+    public void testIsEmptyWhenOneGlobPattern() {
+        this.isEmptyAndCheck(
+                "*",
+                false
+        );
+    }
+
+    @Test
+    public void testIsEmptyWhenSeveralGlobPatterns() {
+        this.isEmptyAndCheck(
+                "1 2* ?3",
+                false
+        );
+    }
+
+    private void isEmptyAndCheck(final String text,
+                                 final boolean expected) {
+        this.isEmptyAndCheck(
+                this.parseString(text),
+                expected
+        );
+    }
+
     // Predicate........................................................................................................
 
     @Test