core: Add PotentialAnnotation helper to store different annotation possibilities (none, type, insance).

1 files changed, 126 insertions, 0 deletions

diff --git a/sangria-core/src/test/java/com/tavianator/sangria/core/PotentialAnnotationTest.java b/sangria-core/src/test/java/com/tavianator/sangria/core/PotentialAnnotationTest.java
new file mode 100644
index 0000000..c4ccc36
--- /dev/null
+++ b/sangria-core/src/test/java/com/tavianator/sangria/core/PotentialAnnotationTest.java
@@ -0,0 +1,126 @@
+/****************************************************************************
+ * Sangria                                                                  *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com>             *
+ *                                                                          *
+ * Licensed under the Apache License, Version 2.0 (the "License");          *
+ * you may not use this file except in compliance with the License.         *
+ * You may obtain a copy of the License at                                  *
+ *                                                                          *
+ * http://www.apache.org/licenses/LICENSE-2.0                               *
+ *                                                                          *
+ * Unless required by applicable law or agreed to in writing, software      *
+ * distributed under the License is distributed on an "AS IS" BASIS,        *
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
+ * See the License for the specific language governing permissions and      *
+ * limitations under the License.                                           *
+ ****************************************************************************/
+
+package com.tavianator.sangria.core;
+
+import java.lang.annotation.Annotation;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import javax.inject.Qualifier;
+
+import com.google.inject.CreationException;
+import com.google.inject.Key;
+import com.google.inject.name.Names;
+import org.hamcrest.Matcher;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+/**
+ * Tests for {@link PotentialAnnotation}s.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.1
+ * @since 1.1
+ */
+public class PotentialAnnotationTest {
+    @Retention(RetentionPolicy.RUNTIME)
+    @Qualifier
+    private @interface Simple {
+    }
+
+    private final PotentialAnnotation none = PotentialAnnotation.none();
+    private final Annotation nameAnnotation = Names.named("name");
+
+    @Test
+    public void testHasAnnotation() {
+        assertThat(none.hasAnnotation(), is(false));
+        assertThat(none.annotatedWith(Simple.class).hasAnnotation(), is(true));
+        assertThat(none.annotatedWith(nameAnnotation).hasAnnotation(), is(true));
+    }
+
+    @Test(expected = CreationException.class)
+    public void testInvalidAnnotatedWithType() {
+        none.annotatedWith(Simple.class)
+                .annotatedWith(Simple.class);
+    }
+
+    @Test(expected = CreationException.class)
+    public void testInvalidAnnotatedWithInstance() {
+        none.annotatedWith(Names.named("name"))
+                .annotatedWith(Names.named("name"));
+    }
+
+    @Test
+    public void testGetKey() {
+        assertThat(none.getKey(String.class),
+                equalTo(new Key<String>() { }));
+        assertThat(none.annotatedWith(Simple.class).getKey(String.class),
+                equalTo(new Key<String>(Simple.class) { }));
+        assertThat(none.annotatedWith(nameAnnotation).getKey(String.class),
+                equalTo(new Key<String>(nameAnnotation) { }));
+    }
+
+    @Test
+    public void testVisitor() {
+        PotentialAnnotation.Visitor<String> visitor = new PotentialAnnotation.Visitor<String>() {
+            @Override
+            public String visitNoAnnotation() {
+                return "none";
+            }
+
+            @Override
+            public String visitAnnotationType(Class<? extends Annotation> annotationType) {
+                assertThat((Object)annotationType, equalTo((Object)Simple.class));
+                return "type";
+            }
+
+            @Override
+            public String visitAnnotationInstance(Annotation annotation) {
+                assertThat(annotation, equalTo(nameAnnotation));
+                return "instance";
+            }
+        };
+
+        assertThat(none.accept(visitor), equalTo("none"));
+        assertThat(none.annotatedWith(Simple.class).accept(visitor), equalTo("type"));
+        assertThat(none.annotatedWith(nameAnnotation).accept(visitor), equalTo("instance"));
+    }
+
+    @Test
+    public void testToString() {
+        assertThat(none.toString(),
+                equalTo("[no annotation]"));
+        assertThat(none.annotatedWith(Simple.class).toString(),
+                equalTo("@com.tavianator.sangria.core.PotentialAnnotationTest.Simple"));
+        assertThat(none.annotatedWith(nameAnnotation).toString(),
+                equalTo("@com.google.inject.name.Named(value=name)"));
+    }
+
+    /**
+     * Needed to avoid compilation error to to inferred type being anonymous class.
+     */
+    private static <T> Matcher<Key<T>> equalTo(Key<T> key) {
+        return Matchers.equalTo(key);
+    }
+
+    private static <T> Matcher<T> equalTo(T object) {
+        return Matchers.equalTo(object);
+    }
+}