Moved LocalDateTimeAsText functionality to TextOf ctors (yegor256#1006)

src/main/java/org/cactoos/text/TextOf.java

@@ -32,12 +32,19 @@
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.Locale;
 import org.cactoos.Bytes;
 import org.cactoos.Input;
 import org.cactoos.Scalar;
 import org.cactoos.io.BytesOf;
 import org.cactoos.io.InputOf;
 import org.cactoos.iterable.Mapped;
+import org.cactoos.time.Iso;
 
 /**
  * TextOf
@@ -341,6 +348,50 @@ public TextOf(final InputStream input) {
         this(new InputOf(new InputStreamReader(input, StandardCharsets.UTF_8)));
     }
 
+    /**
+     * Formats date using ISO date time format.
+     * @param date The date to format.
+     * @since 1.0
+     */
+    public TextOf(final LocalDate date) {
+        this(date, new Iso().value());
+    }
+
+    /**
+     * Formats date using provided date time format string using default locale.
+     * @param date The date to format.
+     * @param format The format to use.
+     * @since 1.0
+     */
+    public TextOf(final LocalDate date, final String format) {
+        this(date, format, Locale.getDefault(Locale.Category.FORMAT));
+    }
+
+    /**
+     * Formats the date using the provided format string using the provided
+     * locale.
+     * @param date The date to format.
+     * @param format The format string to use.
+     * @param locale The locale to use.
+     * @since 1.0
+     */
+    public TextOf(final LocalDate date, final String format,
+        final Locale locale) {
+        this(date, DateTimeFormatter.ofPattern(format, locale));
+    }
+
+    /**
+     * Formats the date using the provided formatter.
+     * @param date The date to format.
+     * @param formatter The formatter to use.
+     * @since 1.0
+     */
+    public TextOf(final LocalDate date, final DateTimeFormatter formatter) {
+        this(() -> formatter.format(
+            ZonedDateTime.of(date, LocalTime.MIN, ZoneId.systemDefault())
+        ));
+    }
+
     /**
      * Ctor.
      *

src/main/java/org/cactoos/time/Iso.java

@@ -30,7 +30,7 @@
  * The formatter.
  * @since 0.27
  */
-final class Iso implements Scalar<DateTimeFormatter> {
+public final class Iso implements Scalar<DateTimeFormatter> {
 
     @Override
     public DateTimeFormatter value() {

src/test/java/org/cactoos/text/TextOfTest.java

@@ -28,6 +28,11 @@
 import java.io.InputStream;
 import java.io.StringReader;
 import java.nio.charset.StandardCharsets;
+import java.text.MessageFormat;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.util.Locale;
 import org.cactoos.io.BytesOf;
 import org.cactoos.io.InputOf;
 import org.hamcrest.MatcherAssert;
@@ -311,4 +316,52 @@ public void printsStackTraceFromArray() {
             )
         );
     }
+
+    @Test
+    public void readsLocalDateFormattedWithFormatString() throws IOException {
+        final LocalDate date = LocalDate.of(2017, 12, 13);
+        MatcherAssert.assertThat(
+            "Can't format a LocalDate with format.",
+            new TextOf(date, "yyyy-MM-dd HH:mm:ss").asString(),
+            Matchers.is("2017-12-13 00:00:00")
+        );
+    }
+
+    @Test
+    public void readsLocalDateFormattedWithFormatStringWithLocale()
+        throws IOException {
+        final LocalDate date = LocalDate.of(2017, 12, 13);
+        MatcherAssert.assertThat(
+            "Can't format a LocalDate with format using locale.",
+            new TextOf(
+                date, "yyyy MMM dd. HH.mm.ss", Locale.FRENCH
+            ).asString(),
+            Matchers.is("2017 déc. 13. 00.00.00")
+        );
+    }
+
+    @Test
+    public void readsLocalDateFormattedAsIsoDateTime() throws IOException {
+        final LocalDate date = LocalDate.of(2017, 12, 13);
+        MatcherAssert.assertThat(
+            "Can't format a LocalDate with default/ISO format.",
+            new TextOf(date).asString(),
+            Matchers.is(
+                MessageFormat.format(
+                "2017-12-13T00:00:00{0}",
+                date.atTime(LocalTime.MIN).atZone(ZoneId.systemDefault())
+                    .getOffset().toString()
+                )
+            )
+        );
+    }
+
+    @Test
+    public void readsCurrentLocalDateAsText() throws IOException {
+        MatcherAssert.assertThat(
+            "Can't format a LocalDate with ISO format.",
+            new TextOf(LocalDate.now()).asString(),
+            Matchers.notNullValue()
+        );
+    }
 }