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convert empty string to empty collection or array #54

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May 14, 2021
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convert empty string to empty collection or array #54

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convert empty string to collection or array
May 11, 2021
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convert empty string to collection or array
May 13, 2021
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convert empty string to collection or array
May 14, 2021
08bf0e1
convert empty string to collection or array
May 14, 2021
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4 changes: 2 additions & 2 deletions docs/Reference Doc/v0.1.0/restlight_starter/serialization.md
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Expand Up @@ -116,7 +116,7 @@ spring.gson.date-format=yyyy-MM-dd HH:mm:ss
```

Restlight同样支持该标准，其作用逻辑如下图所示：
![序列化器兼容springboot逻辑图.png](img/SerializationOfSpringBoot.png)
![序列化器兼容springboot逻辑图.png](../../../img/serialization_of_springboot.png)
如图所示，配置文件中Jackson和Gson相关内容要想生效，需要满足如下条件：
> 1. 用户没有手动定制HttpJsonBodySerializerAdapter
> 2. 用户没有手动注入Jackson或者Gson序列化器(FastJsonHttpBodySerializer和GsonJsonHttpBodySerializer)
Expand Down Expand Up @@ -310,4 +310,4 @@ Restlight内置了ProtoBuf序列化器的实现，对应支持的MediaType为`ap
> - 值为ByteBuf类型时直接将结果写入响应
> - 以上均不符合则使用序列化器进行序列化。
> - 如果Controlelr上未配置`@ResponseBody`，值为基本类型或基本类型包装类将返回该类型的字符串结果（调用String.valueOf()）。
> - 以上均不符合则抛异常。
> - 以上均不符合则抛异常。
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136 changes: 84 additions & 52 deletions restlight-common/src/main/java/esa/restlight/core/util/ConverterUtils.java
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Expand Up @@ -40,6 +40,7 @@
import java.util.List;
import java.util.Map;
import java.util.NavigableSet;
import java.util.Optional;
import java.util.Set;
import java.util.SortedSet;
import java.util.StringTokenizer;
Expand All @@ -63,35 +64,39 @@ private ConverterUtils() {
= new HashMap<>(32);

static {
STRING_CONVERTER_MAP.put(Byte.class, Byte::valueOf);
STRING_CONVERTER_MAP.put(byte.class, Byte::parseByte);
STRING_CONVERTER_MAP.put(Byte.class, v -> StringUtils.isEmpty(v) ? null : Byte.valueOf(v));
STRING_CONVERTER_MAP.put(byte.class, v -> v == null ? null : Byte.parseByte(v));

STRING_CONVERTER_MAP.put(Character.class, v -> v.length() > 0 ? v.charAt(0) : v);
STRING_CONVERTER_MAP.put(char.class, v -> v.length() >= 1 ? v.charAt(0) : v);
STRING_CONVERTER_MAP.put(Character.class, v -> StringUtils.isEmpty(v)
? null : v.charAt(0));
STRING_CONVERTER_MAP.put(char.class, v -> v == null ? null : v.length() > 0 ? v.charAt(0) : v);

STRING_CONVERTER_MAP.put(Boolean.class, v -> (Boolean.parseBoolean(v) || "1".equals(v)) ? Boolean.TRUE :
Boolean.FALSE);
STRING_CONVERTER_MAP.put(boolean.class, v -> (Boolean.parseBoolean(v) || "1".equals(v)));
STRING_CONVERTER_MAP.put(Boolean.class, v -> StringUtils.isEmpty(v)
? null : (Boolean.parseBoolean(v) || "1".equals(v)) ? Boolean.TRUE : Boolean.FALSE);
STRING_CONVERTER_MAP.put(boolean.class, v -> v == null ? null : (Boolean.parseBoolean(v) || "1".equals(v)));

STRING_CONVERTER_MAP.put(Short.class, Short::valueOf);
STRING_CONVERTER_MAP.put(short.class, Short::parseShort);
STRING_CONVERTER_MAP.put(Short.class, v -> StringUtils.isEmpty(v) ? null : Short.valueOf(v));
STRING_CONVERTER_MAP.put(short.class, v -> v == null ? null : Short.parseShort(v));

STRING_CONVERTER_MAP.put(Integer.class, Integer::valueOf);
STRING_CONVERTER_MAP.put(int.class, Integer::parseInt);
STRING_CONVERTER_MAP.put(Integer.class, v -> StringUtils.isEmpty(v) ? null : Integer.valueOf(v));
STRING_CONVERTER_MAP.put(int.class, v -> v == null ? null : Integer.parseInt(v));

STRING_CONVERTER_MAP.put(Long.class, Long::valueOf);
STRING_CONVERTER_MAP.put(long.class, Long::parseLong);
STRING_CONVERTER_MAP.put(Long.class, v -> StringUtils.isEmpty(v) ? null : Long.valueOf(v));
STRING_CONVERTER_MAP.put(long.class, v -> v == null ? null : Long.parseLong(v));

STRING_CONVERTER_MAP.put(Double.class, Double::valueOf);
STRING_CONVERTER_MAP.put(double.class, Double::parseDouble);
STRING_CONVERTER_MAP.put(Double.class, v -> StringUtils.isEmpty(v) ? null : Double.valueOf(v));
STRING_CONVERTER_MAP.put(double.class, v -> v == null ? null : Double.parseDouble(v));

STRING_CONVERTER_MAP.put(Float.class, Float::valueOf);
STRING_CONVERTER_MAP.put(float.class, Float::parseFloat);
STRING_CONVERTER_MAP.put(Float.class, v -> StringUtils.isEmpty(v) ? null : Float.valueOf(v));
STRING_CONVERTER_MAP.put(float.class, v -> v == null ? null : Float.parseFloat(v));

STRING_CONVERTER_MAP.put(Void.class, v -> null);
STRING_CONVERTER_MAP.put(void.class, v -> null);

STRING_CONVERTER_MAP.put(BigDecimal.class, v -> BigDecimal.valueOf(Double.parseDouble(v)));
STRING_CONVERTER_MAP.put(BigDecimal.class, v -> StringUtils.isEmpty(v)
? null : new BigDecimal(v));

// convert a empty string to a null is not supported
STRING_CONVERTER_MAP.put(Timestamp.class, Timestamp::valueOf);
STRING_CONVERTER_MAP.put(String.class, v -> v);
STRING_CONVERTER_MAP.put(Object.class, v -> v);
Expand Down Expand Up @@ -139,17 +144,13 @@ public static String normaliseDefaultValue(String value) {
@SuppressWarnings("unchecked")
public static <T> T forceConvertStringValue(String value, Type requiredType) {
Checks.checkNotNull(requiredType, "requiredType");
if (StringUtils.isEmpty(value)) {
return null;
} else {
Function<String, Object> converter = ConverterUtils.str2ObjectConverter(requiredType);
if (converter == null) {
throw new IllegalArgumentException("Could not convert given value '"
+ value
+ "'to target type '" + requiredType + "'");
}
return (T) converter.apply(value);
Function<String, Object> converter = ConverterUtils.str2ObjectConverter(requiredType);
if (converter == null) {
throw new IllegalArgumentException("Could not convert given value '"
+ value
+ "' to target type '" + requiredType + "'");
}
return (T) converter.apply(value);
}

/**
Expand All @@ -172,12 +173,7 @@ public static Function<String, Object> str2ObjectConverter(Type requiredType, Fu
if (str2Object == null) {
return def;
}
return p -> {
if (p == null) {
return null;
}
return str2Object.apply(p);
};
return str2Object;
}

/**
Expand All @@ -193,12 +189,8 @@ public static Function<Collection<String>, Object> strs2ObjectConverter(Type req
if (strs2Object == null) {
return null;
}
return p -> {
if (p == null) {
return null;
}
return strs2Object.apply(p);
};

return strs2Object;
}

private static Function<Collection<String>, Object> strs2ObjectConverter(Class<?> requiredClass,
Expand All @@ -215,6 +207,43 @@ private static Function<Collection<String>, Object> strs2ObjectConverter(Class<?
return null;
}

private static Class<?> retrieveElementType(Type requiredType) {
Class<?> elementType = null;
if (requiredType != null) {
elementType = ClassUtils.retrieveFirstGenericType(requiredType).orElse(null);
}

if (elementType == null) {
elementType = Object.class;
}

return elementType;
}

private static class Str2OptionalConverter implements Function<String, Object> {

private final Function<String, Object> elementConverter;

private Str2OptionalConverter(Function<String, Object> elementConverter) {
this.elementConverter = elementConverter;
}

private static Str2OptionalConverter of(Type requiredType) {
Function<String, Object> elementConverter = getStr2ObjectConverter(retrieveElementType(requiredType),
null);
if (elementConverter == null) {
// we don't know how to convert the elements
return null;
}
return new Str2OptionalConverter(elementConverter);
}

@Override
public Object apply(String s) {
return s == null ? Optional.empty() : Optional.ofNullable(elementConverter.apply(s));
}
}

/**
* Converts a collection of {@link String} values to an array.
*/
Expand All @@ -240,6 +269,9 @@ private static Strs2ArrayConverter of(Class<?> requiredClass) {

@Override
public Object apply(Collection<String> value) {
if (value == null) {
return null;
}
final Object array = Array.newInstance(elementType, value.size());

int i = 0;
Expand Down Expand Up @@ -272,7 +304,7 @@ private static Str2ArrayConverter of(Class<?> requiredClass) {

@Override
public Object apply(String value) {
return strList2ArrayConverter.apply(extractStringFields(value));
return value == null ? null : strList2ArrayConverter.apply(extractStringFields(value));
}
}

Expand Down Expand Up @@ -300,16 +332,8 @@ private static Strs2CollectionConverter of(Class<?> requiredClass, Type required
return null;
}

Class<?> elementType = null;
if (requiredType != null) {
elementType = ClassUtils.retrieveFirstGenericType(requiredType).orElse(null);
}

if (elementType == null) {
elementType = Object.class;
}

Function<String, Object> elementConverter = getStr2ObjectConverter(elementType, null);
Function<String, Object> elementConverter = getStr2ObjectConverter(retrieveElementType(requiredType),
null);
if (elementConverter == null) {
// we don't know how to convert the elements
return null;
Expand All @@ -320,6 +344,9 @@ private static Strs2CollectionConverter of(Class<?> requiredClass, Type required
@SuppressWarnings("unchecked")
@Override
public Object apply(Collection<String> value) {
if (value == null) {
return null;
}
final Collection collection = collectionGenerator.apply(value.size());
for (String v : value) {
// convert to target type and fill in the collection.
Expand Down Expand Up @@ -352,7 +379,7 @@ private static Str2CollectionConverter of(Class<?> requiredClass, Type requiredT

@Override
public Object apply(String value) {
return strs2CollectionConverter.apply(extractStringFields(value));
return value == null ? null : strs2CollectionConverter.apply(extractStringFields(value));
}
}

Expand All @@ -371,6 +398,11 @@ private static Function<String, Object> getStr2ObjectConverter(Class<?> required
return converter;
}

if (Optional.class.isAssignableFrom(requiredClass)
&& (converter = Str2OptionalConverter.of(requiredType)) != null) {
return converter;
}

// have a constructor that accepts a single String argument.
Constructor<?> constructor = getSingleStringParameterConstructor(requiredClass);
if (constructor != null) {
Expand Down
68 changes: 68 additions & 0 deletions restlight-common/src/test/java/esa/restlight/core/util/ConverterUtilsTest.java
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Expand Up @@ -26,13 +26,15 @@
import java.util.LinkedList;
import java.util.List;
import java.util.NavigableSet;
import java.util.Optional;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.CopyOnWriteArrayList;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertSame;
Expand Down Expand Up @@ -65,6 +67,24 @@ void testConvertString2Primitives() {
assertNull(ConverterUtils.str2ObjectConverter(Void.class).apply("10"));
}

@Test
void testConvertString2Wrappers() {
assertNull(ConverterUtils.str2ObjectConverter(Byte.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Character.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Boolean.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Short.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Integer.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Long.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Double.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Float.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(Void.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(BigDecimal.class).apply(""));
assertThrows(IllegalArgumentException.class,
() -> ConverterUtils.str2ObjectConverter(Timestamp.class).apply(""));
assertNull(ConverterUtils.str2ObjectConverter(String.class).apply(null));
assertNull(ConverterUtils.str2ObjectConverter(Object.class).apply(null));
}

@Test
void testConvertString2Objects() {
assertEquals(new BigDecimal("10.0"), ConverterUtils.str2ObjectConverter(BigDecimal.class).apply("10.0"));
Expand Down Expand Up @@ -165,6 +185,41 @@ void testConvertString2Collection() throws NoSuchMethodException {
assertNull(ConverterUtils.str2ObjectConverter(MyList.class));
}

@Test
void testConvertString2Optional() throws NoSuchMethodException {
final Optional<String> optional0 = (Optional<String>)
ConverterUtils.str2ObjectConverter(Subject.class.getDeclaredMethod("optionalString")
.getGenericReturnType()).apply(null);
assertFalse(optional0.isPresent());

final Optional<Long> optional1 = (Optional<Long>)
ConverterUtils.str2ObjectConverter(Subject.class.getDeclaredMethod("optionalLong")
.getGenericReturnType()).apply(null);
assertFalse(optional1.isPresent());

final Optional<String[]> optional2 = (Optional<String[]>)
ConverterUtils.str2ObjectConverter(Subject.class.getDeclaredMethod("optionalArray")
.getGenericReturnType()).apply(null);
assertFalse(optional2.isPresent());

final Optional<String[]> optional3 = (Optional<String[]>)
ConverterUtils.str2ObjectConverter(Subject.class.getDeclaredMethod("optionalArray")
.getGenericReturnType()).apply("");
assertTrue(optional3.isPresent());
assertEquals(0, optional3.get().length);

final Optional<Collection<String>> optional4 = (Optional<Collection<String>>)
ConverterUtils.str2ObjectConverter(Subject.class.getDeclaredMethod("optionalCollection")
.getGenericReturnType()).apply(null);
assertFalse(optional4.isPresent());

final Optional<Collection<String>> optional5 = (Optional<Collection<String>>)
ConverterUtils.str2ObjectConverter(Subject.class.getDeclaredMethod("optionalCollection")
.getGenericReturnType()).apply("");
assertTrue(optional5.isPresent());
assertTrue(optional5.get().isEmpty());
}

@Test
void testConvertStringCollection2PrimitiveArray() {
final List<String> forTest = Arrays.asList("1", "2", "3", "4");
Expand Down Expand Up @@ -217,6 +272,14 @@ private interface Subject {
LinkedList<Double> doubleLinkedList();

Collection<int[]> intArrayCollection();

Optional<String> optionalString();

Optional<Long> optionalLong();

Optional<String[]> optionalArray();

Optional<Collection<String>> optionalCollection();
}

@Test
Expand Down Expand Up @@ -327,6 +390,11 @@ void testForceConvertStringValue() {
assertNull(ConverterUtils.forceConvertStringValue("", Integer.class));
assertThrows(IllegalArgumentException.class,
() -> ConverterUtils.forceConvertStringValue("foo", MyList.class));

assertNull(ConverterUtils.forceConvertStringValue(null, Collection.class));
assertNull(ConverterUtils.forceConvertStringValue(null, String[].class));
assertNotNull(ConverterUtils.forceConvertStringValue("", Collection.class));
assertNotNull(ConverterUtils.forceConvertStringValue("", String[].class));
}

@Test
Expand Down
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