From f9415da7c168e45cadbb7b9b15bd03a453d237b3 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 6 May 2014 20:28:55 -0400
Subject: core: Add TypeLiterals utility class.
---
.../com/tavianator/sangria/core/TypeLiterals.java | 87 ++++++++++++++++++++++
.../tavianator/sangria/core/TypeLiteralsTest.java | 80 ++++++++++++++++++++
2 files changed, 167 insertions(+)
create mode 100644 sangria-core/src/main/java/com/tavianator/sangria/core/TypeLiterals.java
create mode 100644 sangria-core/src/test/java/com/tavianator/sangria/core/TypeLiteralsTest.java
(limited to 'sangria-core/src')
diff --git a/sangria-core/src/main/java/com/tavianator/sangria/core/TypeLiterals.java b/sangria-core/src/main/java/com/tavianator/sangria/core/TypeLiterals.java
new file mode 100644
index 0000000..833f70d
--- /dev/null
+++ b/sangria-core/src/main/java/com/tavianator/sangria/core/TypeLiterals.java
@@ -0,0 +1,87 @@
+/****************************************************************************
+ * 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.util.*;
+
+import com.google.inject.Provider;
+import com.google.inject.TypeLiteral;
+import com.google.inject.util.Types;
+
+/**
+ * Static utility functions for working with {@link TypeLiteral}s.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.1
+ * @since 1.1
+ */
+public class TypeLiterals {
+ private TypeLiterals() {
+ // Not for instantiating
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <T> TypeLiteral<List<T>> listOf(Class<T> type) {
+ return (TypeLiteral<List<T>>)TypeLiteral.get(Types.listOf(type));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <T> TypeLiteral<List<T>> listOf(TypeLiteral<T> type) {
+ return (TypeLiteral<List<T>>)TypeLiteral.get(Types.listOf(type.getType()));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <T> TypeLiteral<Set<T>> setOf(Class<T> type) {
+ return (TypeLiteral<Set<T>>)TypeLiteral.get(Types.setOf(type));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <T> TypeLiteral<Set<T>> setOf(TypeLiteral<T> type) {
+ return (TypeLiteral<Set<T>>)TypeLiteral.get(Types.setOf(type.getType()));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <K, V> TypeLiteral<Map<K, V>> mapOf(Class<K> keyType, Class<V> valueType) {
+ return (TypeLiteral<Map<K, V>>)TypeLiteral.get(Types.mapOf(keyType, valueType));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <K, V> TypeLiteral<Map<K, V>> mapOf(Class<K> keyType, TypeLiteral<V> valueType) {
+ return (TypeLiteral<Map<K, V>>)TypeLiteral.get(Types.mapOf(keyType, valueType.getType()));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <K, V> TypeLiteral<Map<K, V>> mapOf(TypeLiteral<K> keyType, Class<V> valueType) {
+ return (TypeLiteral<Map<K, V>>)TypeLiteral.get(Types.mapOf(keyType.getType(), valueType));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <K, V> TypeLiteral<Map<K, V>> mapOf(TypeLiteral<K> keyType, TypeLiteral<V> valueType) {
+ return (TypeLiteral<Map<K, V>>)TypeLiteral.get(Types.mapOf(keyType.getType(), valueType.getType()));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <T> TypeLiteral<Provider<T>> providerOf(Class<T> type) {
+ return (TypeLiteral<Provider<T>>)TypeLiteral.get(Types.providerOf(type));
+ }
+
+ @SuppressWarnings("unchecked")
+ public static <T> TypeLiteral<Provider<T>> providerOf(TypeLiteral<T> type) {
+ return (TypeLiteral<Provider<T>>)TypeLiteral.get(Types.providerOf(type.getType()));
+ }
+}
diff --git a/sangria-core/src/test/java/com/tavianator/sangria/core/TypeLiteralsTest.java b/sangria-core/src/test/java/com/tavianator/sangria/core/TypeLiteralsTest.java
new file mode 100644
index 0000000..93dea77
--- /dev/null
+++ b/sangria-core/src/test/java/com/tavianator/sangria/core/TypeLiteralsTest.java
@@ -0,0 +1,80 @@
+/****************************************************************************
+ * 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.util.*;
+
+import com.google.inject.Provider;
+import com.google.inject.TypeLiteral;
+import org.hamcrest.Matcher;
+import org.hamcrest.Matchers;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Tests for {@link TypeLiterals}.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.1
+ * @since 1.1
+ */
+public class TypeLiteralsTest {
+ @Test
+ public void testListOf() {
+ assertThat(TypeLiterals.listOf(String.class),
+ equalTo(new TypeLiteral<List<String>>() { }));
+ assertThat(TypeLiterals.listOf(new TypeLiteral<Class<?>>() { }),
+ equalTo(new TypeLiteral<List<Class<?>>>() { }));
+ }
+
+ @Test
+ public void testSetOf() {
+ assertThat(TypeLiterals.setOf(String.class),
+ equalTo(new TypeLiteral<Set<String>>() { }));
+ assertThat(TypeLiterals.setOf(new TypeLiteral<Class<?>>() { }),
+ equalTo(new TypeLiteral<Set<Class<?>>>() { }));
+ }
+
+ @Test
+ public void testMapOf() {
+ assertThat(TypeLiterals.mapOf(String.class, String.class),
+ equalTo(new TypeLiteral<Map<String, String>>() { }));
+ assertThat(TypeLiterals.mapOf(String.class, new TypeLiteral<Class<?>>() { }),
+ equalTo(new TypeLiteral<Map<String, Class<?>>>() { }));
+ assertThat(TypeLiterals.mapOf(new TypeLiteral<Class<?>>() { }, String.class),
+ equalTo(new TypeLiteral<Map<Class<?>, String>>() { }));
+ assertThat(TypeLiterals.mapOf(new TypeLiteral<Class<?>>() { }, new TypeLiteral<Class<?>>() { }),
+ equalTo(new TypeLiteral<Map<Class<?>, Class<?>>>() { }));
+ }
+
+ @Test
+ public void testProviderOf() {
+ assertThat(TypeLiterals.providerOf(String.class),
+ equalTo(new TypeLiteral<Provider<String>>() { }));
+ assertThat(TypeLiterals.providerOf(new TypeLiteral<Class<?>>() { }),
+ equalTo(new TypeLiteral<Provider<Class<?>>>() { }));
+ }
+
+ /**
+ * Needed to avoid compilation error to to inferred type being anonymous class.
+ */
+ private static <T> Matcher<TypeLiteral<T>> equalTo(TypeLiteral<T> type) {
+ return Matchers.equalTo(type);
+ }
+}
--
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