Added Java 8 InstantParam with test.

lightswitch05 · lightswitch05 · commit 8710100e40e3 · 2017-05-08T12:23:29.000-04:00
diff --git a/dropwizard-jersey/src/main/java/io/dropwizard/jersey/params/InstantParam.java b/dropwizard-jersey/src/main/java/io/dropwizard/jersey/params/InstantParam.java
@@ -0,0 +1,26 @@
+package io.dropwizard.jersey.params;
+
+import java.time.Instant;
+
+/**
+ * A parameter encapsulating date/time values. All non-parsable values will return a {@code 400 Bad Request} response.
+ */
+public class InstantParam extends AbstractParam<Instant> {
+    public InstantParam(final String input) {
+        super(input);
+    }
+
+    public InstantParam(final String input, final String parameterName) {
+        super(input, parameterName);
+    }
+
+    @Override
+    protected String errorMessage(Exception e) {
+        return "%s must be in a ISO-8601 format.";
+    }
+
+    @Override
+    protected Instant parse(final String input) throws Exception {
+        return Instant.parse(input);
+    }
+}
diff --git a/dropwizard-jersey/src/test/java/io/dropwizard/jersey/params/InstantParamTest.java b/dropwizard-jersey/src/test/java/io/dropwizard/jersey/params/InstantParamTest.java
@@ -0,0 +1,43 @@
+package io.dropwizard.jersey.params;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.failBecauseExceptionWasNotThrown;
+
+import io.dropwizard.jersey.errors.ErrorMessage;
+import org.junit.Test;
+
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.LocalDateTime;
+import javax.ws.rs.WebApplicationException;
+import javax.ws.rs.core.Response;
+
+public class InstantParamTest {
+    @Test
+    public void parsesDateTimes() throws Exception {
+        final InstantParam param = new InstantParam("2012-11-19T00:00:00Z");
+        Instant instant = LocalDateTime.of(2012, 11, 19, 0, 0)
+            .toInstant(ZoneOffset.UTC);
+
+        assertThat(param.get())
+            .isEqualTo(instant);
+    }
+
+    @Test
+    public void nullThrowsAnException() throws Exception {
+        try {
+            new InstantParam(null);
+            failBecauseExceptionWasNotThrown(WebApplicationException.class);
+        } catch (WebApplicationException e) {
+            final Response response = e.getResponse();
+
+            assertThat(response.getStatus())
+                .isEqualTo(400);
+
+            ErrorMessage entity = (ErrorMessage) response.getEntity();
+            assertThat(entity.getCode()).isEqualTo(400);
+            assertThat(entity.getMessage())
+                .isEqualTo("Parameter must be in a ISO-8601 format.");
+        }
+    }
+}
