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Convenient forType methods for ParameterizedTypeReference

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Issue: SPR-16054
This commit is contained in:
Juergen Hoeller
2017-10-09 13:59:01 +02:00
parent d4677be5c0
commit 53091c76bf
4 changed files with 77 additions and 16 deletions
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47
spring-core/src/test/java/org/springframework/core/ParameterizedTypeReferenceTests.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2013 the original author or authors.
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -33,25 +33,40 @@ import static org.junit.Assert.*;
public class ParameterizedTypeReferenceTests {
@Test
public void map() throws NoSuchMethodException {
Type mapType = getClass().getMethod("mapMethod").getGenericReturnType();
ParameterizedTypeReference<Map<Object,String>> mapTypeReference = new ParameterizedTypeReference<Map<Object,String>>() {};
assertEquals(mapType, mapTypeReference.getType());
}
@Test
public void list() throws NoSuchMethodException {
Type mapType = getClass().getMethod("listMethod").getGenericReturnType();
ParameterizedTypeReference<List<String>> mapTypeReference = new ParameterizedTypeReference<List<String>>() {};
assertEquals(mapType, mapTypeReference.getType());
}
@Test
public void string() {
public void stringTypeReference() {
ParameterizedTypeReference<String> typeReference = new ParameterizedTypeReference<String>() {};
assertEquals(String.class, typeReference.getType());
}
@Test
public void mapTypeReference() throws Exception {
Type mapType = getClass().getMethod("mapMethod").getGenericReturnType();
ParameterizedTypeReference<Map<Object,String>> typeReference = new ParameterizedTypeReference<Map<Object,String>>() {};
assertEquals(mapType, typeReference.getType());
}
@Test
public void listTypeReference() throws Exception {
Type listType = getClass().getMethod("listMethod").getGenericReturnType();
ParameterizedTypeReference<List<String>> typeReference = new ParameterizedTypeReference<List<String>>() {};
assertEquals(listType, typeReference.getType());
}
@Test
public void reflectiveTypeReferenceWithSpecificDeclaration() throws Exception{
Type listType = getClass().getMethod("listMethod").getGenericReturnType();
ParameterizedTypeReference<List<String>> typeReference = ParameterizedTypeReference.forType(listType);
assertEquals(listType, typeReference.getType());
}
@Test
public void reflectiveTypeReferenceWithGenericDeclaration() throws Exception{
Type listType = getClass().getMethod("listMethod").getGenericReturnType();
ParameterizedTypeReference<?> typeReference = ParameterizedTypeReference.forType(listType);
assertEquals(listType, typeReference.getType());
}
public static Map<Object, String> mapMethod() {
return null;
}

16
spring-core/src/test/java/org/springframework/core/ResolvableTypeTests.java
View File

@@ -870,6 +870,22 @@ public class ResolvableTypeTests {
assertThat(this.typeVariableCaptor.getValue().getName(), equalTo("T"));
}
@Test
public void resolveTypeVariableFromReflectiveParameterizedTypeReference() throws Exception {
Type sourceType = Methods.class.getMethod("typedReturn").getGenericReturnType();
ResolvableType type = ResolvableType.forType(ParameterizedTypeReference.forType(sourceType));
assertThat(type.resolve(), nullValue());
assertThat(type.getType().toString(), equalTo("T"));
}
@Test
public void resolveTypeVariableFromDeclaredParameterizedTypeReference() throws Exception {
Type sourceType = Methods.class.getMethod("charSequenceReturn").getGenericReturnType();
ResolvableType reflectiveType = ResolvableType.forType(sourceType);
ResolvableType declaredType = ResolvableType.forType(new ParameterizedTypeReference<List<CharSequence>>() {});
assertEquals(reflectiveType, declaredType);
}
@Test
public void toStrings() throws Exception {
assertThat(ResolvableType.NONE.toString(), equalTo("?"));