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Add Printer<T> and Parser<T> to FormatterRegistry if they have been exposed as beans.
see gh-16171
1 parent 8d44e31 commit b8ce6da

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‎spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/WebFluxAutoConfiguration.java‎

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@@ -38,6 +38,8 @@
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import org.springframework.boot.autoconfigure.web.ResourceProperties;
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import org.springframework.boot.autoconfigure.web.format.WebConversionService;
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import org.springframework.boot.context.properties.EnableConfigurationProperties;
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import org.springframework.boot.convert.ParserConverter;
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import org.springframework.boot.convert.PrinterConverter;
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import org.springframework.boot.web.codec.CodecCustomizer;
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import org.springframework.boot.web.reactive.filter.OrderedHiddenHttpMethodFilter;
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import org.springframework.context.annotation.Bean;
@@ -48,6 +50,8 @@
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import org.springframework.core.convert.converter.GenericConverter;
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import org.springframework.format.Formatter;
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import org.springframework.format.FormatterRegistry;
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import org.springframework.format.Parser;
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import org.springframework.format.Printer;
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import org.springframework.format.support.FormattingConversionService;
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import org.springframework.http.codec.ServerCodecConfigurer;
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import org.springframework.util.ClassUtils;
@@ -185,6 +189,17 @@ public void addFormatters(FormatterRegistry registry) {
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for (Formatter<?> formatter : getBeansOfType(Formatter.class)) {
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registry.addFormatter(formatter);
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}
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for (Printer<?> printer : getBeansOfType(Printer.class)) {
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if (!(printer instanceof Formatter<?>)) {
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registry.addConverter(new PrinterConverter(printer));
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}
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}
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for (Parser<?> parser : getBeansOfType(Parser.class)) {
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if (!(parser instanceof Formatter<?>)) {
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registry.addConverter(new ParserConverter(parser));
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}
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}
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}
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private <T> Collection<T> getBeansOfType(Class<T> type) {

‎spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration.java‎

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@@ -55,6 +55,8 @@
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import org.springframework.boot.autoconfigure.web.ResourceProperties.Strategy;
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import org.springframework.boot.autoconfigure.web.format.WebConversionService;
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import org.springframework.boot.context.properties.EnableConfigurationProperties;
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import org.springframework.boot.convert.ParserConverter;
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import org.springframework.boot.convert.PrinterConverter;
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import org.springframework.boot.web.servlet.filter.OrderedFormContentFilter;
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import org.springframework.boot.web.servlet.filter.OrderedHiddenHttpMethodFilter;
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import org.springframework.boot.web.servlet.filter.OrderedRequestContextFilter;
@@ -74,6 +76,8 @@
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import org.springframework.core.task.AsyncTaskExecutor;
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import org.springframework.format.Formatter;
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import org.springframework.format.FormatterRegistry;
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import org.springframework.format.Parser;
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import org.springframework.format.Printer;
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import org.springframework.format.support.FormattingConversionService;
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import org.springframework.http.CacheControl;
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import org.springframework.http.MediaType;
@@ -307,6 +311,16 @@ public void addFormatters(FormatterRegistry registry) {
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for (Formatter<?> formatter : getBeansOfType(Formatter.class)) {
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registry.addFormatter(formatter);
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}
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for (Printer<?> printer : getBeansOfType(Printer.class)) {
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if (!(printer instanceof Formatter<?>)) {
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registry.addConverter(new PrinterConverter(printer));
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}
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}
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for (Parser<?> parser : getBeansOfType(Parser.class)) {
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if (!(parser instanceof Formatter<?>)) {
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registry.addConverter(new ParserConverter(parser));
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}
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}
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}
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private <T> Collection<T> getBeansOfType(Class<T> type) {

‎spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/reactive/WebFluxAutoConfigurationTests.java‎

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@@ -19,6 +19,7 @@
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import java.util.Collections;
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import java.util.Date;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import java.util.concurrent.TimeUnit;
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@@ -40,7 +41,10 @@
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import org.springframework.context.annotation.Import;
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import org.springframework.core.Ordered;
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import org.springframework.core.annotation.Order;
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import org.springframework.core.convert.ConversionService;
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.format.Parser;
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import org.springframework.format.Printer;
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import org.springframework.format.support.FormattingConversionService;
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import org.springframework.http.CacheControl;
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import org.springframework.http.codec.ServerCodecConfigurer;
@@ -373,6 +377,17 @@ void cacheControl() {
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Assertions.setExtractBareNamePropertyMethods(true);
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}
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380+
@Test
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void customPrinterAndParserShouldBeRegisteredAsConverters() {
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this.contextRunner.withUserConfiguration(ParserConfiguration.class, PrinterConfiguration.class)
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.run((context) -> {
384+
Foo foo = new Foo("bar");
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ConversionService conversionService = context.getBean(ConversionService.class);
386+
assertThat(conversionService.convert(foo, String.class)).isEqualTo("bar");
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assertThat(conversionService.convert("bar", Foo.class)).extracting(Foo::toString).isEqualTo("bar");
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});
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}
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376391
private Map<PathPattern, Object> getHandlerMap(ApplicationContext context) {
377392
HandlerMapping mapping = context.getBean("resourceHandlerMapping", HandlerMapping.class);
378393
if (mapping instanceof SimpleUrlHandlerMapping) {
@@ -545,4 +560,57 @@ private static class MyRequestMappingHandlerMapping extends RequestMappingHandle
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546561
}
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563+
@Configuration(proxyBeanMethods = false)
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static class PrinterConfiguration {
565+
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@Bean
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public Printer<Foo> fooPrinter() {
568+
return new FooPrinter();
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}
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private static class FooPrinter implements Printer<Foo> {
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@Override
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public String print(Foo foo, Locale locale) {
575+
return foo.toString();
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}
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578+
}
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}
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@Configuration(proxyBeanMethods = false)
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static class ParserConfiguration {
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@Bean
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public Parser<Foo> fooParser() {
587+
return new FooParser();
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}
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private static class FooParser implements Parser<Foo> {
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@Override
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public Foo parse(String source, Locale locale) {
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return new Foo(source);
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}
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}
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}
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static class Foo {
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private final String name;
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Foo(String name) {
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this.name = name;
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}
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@Override
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public String toString() {
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return this.name;
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}
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}
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548616
}

‎spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java‎

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@@ -56,6 +56,8 @@
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.core.io.Resource;
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import org.springframework.core.task.AsyncTaskExecutor;
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import org.springframework.format.Parser;
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import org.springframework.format.Printer;
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import org.springframework.format.support.FormattingConversionService;
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import org.springframework.http.CacheControl;
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import org.springframework.http.HttpHeaders;
@@ -773,6 +775,17 @@ void whenUserDefinesARequestContextFilterRegistrationTheAutoConfiguredFilterBack
773775
});
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}
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778+
@Test
779+
void customPrinterAndParserShouldBeRegisteredAsConverters() {
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this.contextRunner.withUserConfiguration(ParserConfiguration.class, PrinterConfiguration.class)
781+
.run((context) -> {
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Foo foo = new Foo("bar");
783+
ConversionService conversionService = context.getBean(ConversionService.class);
784+
assertThat(conversionService.convert(foo, String.class)).isEqualTo("bar");
785+
assertThat(conversionService.convert("bar", Foo.class)).extracting(Foo::toString).isEqualTo("bar");
786+
});
787+
}
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776789
private void assertCacheControl(AssertableWebApplicationContext context) {
777790
Map<String, Object> handlerMap = getHandlerMap(context.getBean("resourceHandlerMapping", HandlerMapping.class));
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assertThat(handlerMap).hasSize(2);
@@ -1093,4 +1106,57 @@ public FilterRegistrationBean<RequestContextFilter> customRequestContextFilterRe
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10941107
}
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1109+
@Configuration(proxyBeanMethods = false)
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static class PrinterConfiguration {
1111+
1112+
@Bean
1113+
public Printer<Foo> fooPrinter() {
1114+
return new FooPrinter();
1115+
}
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1117+
private static class FooPrinter implements Printer<Foo> {
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@Override
1120+
public String print(Foo foo, Locale locale) {
1121+
return foo.toString();
1122+
}
1123+
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}
1125+
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}
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@Configuration(proxyBeanMethods = false)
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static class ParserConfiguration {
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1131+
@Bean
1132+
public Parser<Foo> fooParser() {
1133+
return new FooParser();
1134+
}
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1136+
private static class FooParser implements Parser<Foo> {
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@Override
1139+
public Foo parse(String source, Locale locale) {
1140+
return new Foo(source);
1141+
}
1142+
1143+
}
1144+
1145+
}
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1147+
static class Foo {
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1149+
private final String name;
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1151+
Foo(String name) {
1152+
this.name = name;
1153+
}
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@Override
1156+
public String toString() {
1157+
return this.name;
1158+
}
1159+
1160+
}
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10961162
}

‎spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/ParserConverter.java‎

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@@ -0,0 +1,93 @@
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/*
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* Copyright 2012-2019 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.boot.convert;
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19+
import java.text.ParseException;
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import java.util.Collections;
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import java.util.Set;
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23+
import org.springframework.context.i18n.LocaleContextHolder;
24+
import org.springframework.core.DecoratingProxy;
25+
import org.springframework.core.GenericTypeResolver;
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import org.springframework.core.convert.TypeDescriptor;
27+
import org.springframework.core.convert.converter.Converter;
28+
import org.springframework.core.convert.converter.GenericConverter;
29+
import org.springframework.format.Parser;
30+
import org.springframework.util.Assert;
31+
import org.springframework.util.StringUtils;
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33+
/**
34+
* {@link Converter} to convert from a {@link String} to {@code <T>} using the underlying
35+
* {@link Parser}{@code <T>}.
36+
*
37+
* @author Dmytro Nosan
38+
* @since 2.2.0
39+
*/
40+
public class ParserConverter implements GenericConverter {
41+
42+
private final Class<?> type;
43+
44+
private final Parser<?> parser;
45+
46+
/**
47+
* Creates a {@code Converter} to convert {@code String} to a {@code T} via parser.
48+
* @param parser parses {@code String} to a {@code T}
49+
*/
50+
public ParserConverter(Parser<?> parser) {
51+
Assert.notNull(parser, "Parser must not be null");
52+
this.type = getType(parser);
53+
this.parser = parser;
54+
}
55+
56+
@Override
57+
public Set<ConvertiblePair> getConvertibleTypes() {
58+
return Collections.singleton(new ConvertiblePair(String.class, this.type));
59+
}
60+
61+
@Override
62+
public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
63+
String value = (String) source;
64+
if (!StringUtils.hasText(value)) {
65+
return null;
66+
}
67+
try {
68+
return this.parser.parse(value, LocaleContextHolder.getLocale());
69+
}
70+
catch (ParseException ex) {
71+
throw new IllegalArgumentException("Value [" + value + "] can not be parsed", ex);
72+
}
73+
}
74+
75+
@Override
76+
public String toString() {
77+
return String.class.getName() + " -> " + this.type.getName() + " : " + this.parser;
78+
}
79+
80+
private static Class<?> getType(Parser<?> parser) {
81+
Class<?> type = GenericTypeResolver.resolveTypeArgument(parser.getClass(), Parser.class);
82+
if (type == null && parser instanceof DecoratingProxy) {
83+
type = GenericTypeResolver.resolveTypeArgument(((DecoratingProxy) parser).getDecoratedClass(),
84+
Parser.class);
85+
}
86+
if (type == null) {
87+
throw new IllegalArgumentException("Unable to extract the parameterized type from Parser: '"
88+
+ parser.getClass().getName() + "'. Does the class parameterize the <T> generic type?");
89+
}
90+
return type;
91+
}
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93+
}

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