SPR-7912 Introduce FormatterRegistrar interface and FormattingConversionServiceFactoryBean enhancements.

org.springframework.context/src/main/java/org/springframework/format/FormatterRegistrar.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2002-2011 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.
+ * 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 org.springframework.format;
+
+import org.springframework.core.convert.converter.Converter;
+
+/**
+ * Registers {@link Converter Converters} and {@link Formatter Formatters} with
+ * a FormattingConversionService through the {@link FormatterRegistry} SPI.
+ * 
+ * @author Keith Donald
+ * @since 3.1
+ */
+public interface FormatterRegistrar {
+
+	/**
+	 * Register Formatters and Converters with a FormattingConversionService 
+	 * through a FormatterRegistry SPI.
+	 * @param registry the FormatterRegistry instance to use.
+	 */
+	void registerFormatters(FormatterRegistry registry);
+
+}

org.springframework.context/src/main/java/org/springframework/format/datetime/joda/JodaTimeFormatterRegistrar.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -13,7 +13,6 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
 package org.springframework.format.datetime.joda;
 
 import java.util.Calendar;
@@ -27,7 +26,7 @@ import org.joda.time.ReadableInstant;
 import org.joda.time.format.DateTimeFormat;
 import org.joda.time.format.DateTimeFormatter;
 import org.joda.time.format.ISODateTimeFormat;
-
+import org.springframework.format.FormatterRegistrar;
 import org.springframework.format.FormatterRegistry;
 import org.springframework.format.Parser;
 import org.springframework.format.Printer;
@@ -37,14 +36,14 @@ import org.springframework.format.Printer;
  *
  * @author Keith Donald
  * @author Juergen Hoeller
- * @since 3.0
+ * @since 3.1
  * @see #setDateStyle
  * @see #setTimeStyle
  * @see #setDateTimeStyle
  * @see #setUseIsoFormat
  * @see #installJodaTimeFormatting
  */
-public class JodaTimeFormattingConfigurer {
+public class JodaTimeFormatterRegistrar implements FormatterRegistrar {
 
 	private String dateStyle;
 
@@ -54,7 +53,6 @@ public class JodaTimeFormattingConfigurer {
 
 	private boolean useIsoFormat;
 
-
 	/**
 	 * Set the default format style of Joda {@link LocalDate} objects.
 	 * Default is {@link DateTimeFormat#shortDate()}.
@@ -89,33 +87,28 @@ public class JodaTimeFormattingConfigurer {
 		this.useIsoFormat = useIsoFormat;
 	}
 
-
-	/**
-	 * Install Joda Time formatters given the current configuration of this {@link JodaTimeFormattingConfigurer}.
-	 */
-	public void installJodaTimeFormatting(FormatterRegistry formatterRegistry) {
-		JodaTimeConverters.registerConverters(formatterRegistry);
+	public void registerFormatters(FormatterRegistry registry) {
+		JodaTimeConverters.registerConverters(registry);
 
 		DateTimeFormatter jodaDateFormatter = getJodaDateFormatter();
-		formatterRegistry.addFormatterForFieldType(LocalDate.class,
-				new ReadablePartialPrinter(jodaDateFormatter), new DateTimeParser(jodaDateFormatter));
+		registry.addFormatterForFieldType(LocalDate.class, new ReadablePartialPrinter(jodaDateFormatter),
+				new DateTimeParser(jodaDateFormatter));
 
 		DateTimeFormatter jodaTimeFormatter = getJodaTimeFormatter();
-		formatterRegistry.addFormatterForFieldType(LocalTime.class,
-				new ReadablePartialPrinter(jodaTimeFormatter), new DateTimeParser(jodaTimeFormatter));
+		registry.addFormatterForFieldType(LocalTime.class, new ReadablePartialPrinter(jodaTimeFormatter),
+				new DateTimeParser(jodaTimeFormatter));
 
 		DateTimeFormatter jodaDateTimeFormatter = getJodaDateTimeFormatter();
 		Parser<DateTime> dateTimeParser = new DateTimeParser(jodaDateTimeFormatter);
-		formatterRegistry.addFormatterForFieldType(LocalDateTime.class,
-				new ReadablePartialPrinter(jodaDateTimeFormatter), dateTimeParser);
+		registry.addFormatterForFieldType(LocalDateTime.class, new ReadablePartialPrinter(jodaDateTimeFormatter),
+				dateTimeParser);
 
 		Printer<ReadableInstant> readableInstantPrinter = new ReadableInstantPrinter(jodaDateTimeFormatter);
-		formatterRegistry.addFormatterForFieldType(ReadableInstant.class, readableInstantPrinter, dateTimeParser);
+		registry.addFormatterForFieldType(ReadableInstant.class, readableInstantPrinter, dateTimeParser);
 
-		formatterRegistry.addFormatterForFieldAnnotation(new JodaDateTimeFormatAnnotationFormatterFactory());
+		registry.addFormatterForFieldAnnotation(new JodaDateTimeFormatAnnotationFormatterFactory());
 	}
 
-
 	// internal helpers
 
 	private DateTimeFormatter getJodaDateFormatter() {
@@ -125,8 +118,7 @@ public class JodaTimeFormattingConfigurer {
 		if (this.dateStyle != null) {
 			return DateTimeFormat.forStyle(this.dateStyle + "-");
 
-		}
-		else {
+		} else {
 			return DateTimeFormat.shortDate();
 		}
 	}
@@ -137,8 +129,7 @@ public class JodaTimeFormattingConfigurer {
 		}
 		if (this.timeStyle != null) {
 			return DateTimeFormat.forStyle("-" + this.timeStyle);
-		}
-		else {
+		} else {
 			return DateTimeFormat.shortTime();
 		}
 	}
@@ -149,8 +140,7 @@ public class JodaTimeFormattingConfigurer {
 		}
 		if (this.dateTimeStyle != null) {
 			return DateTimeFormat.forStyle(this.dateTimeStyle);
-		}
-		else {
+		} else {
 			return DateTimeFormat.shortDateTime();
 		}
 	}

org.springframework.context/src/main/java/org/springframework/format/support/FormattingConversionServiceFactoryBean.java

@@ -28,22 +28,34 @@ import org.springframework.context.EmbeddedValueResolverAware;
 import org.springframework.core.convert.support.ConversionServiceFactory;
 import org.springframework.format.AnnotationFormatterFactory;
 import org.springframework.format.Formatter;
+import org.springframework.format.FormatterRegistrar;
 import org.springframework.format.FormatterRegistry;
 import org.springframework.format.Parser;
 import org.springframework.format.Printer;
 import org.springframework.format.annotation.DateTimeFormat;
-import org.springframework.format.datetime.joda.JodaTimeFormattingConfigurer;
+import org.springframework.format.datetime.joda.JodaTimeFormatterRegistrar;
 import org.springframework.format.number.NumberFormatAnnotationFormatterFactory;
 import org.springframework.util.ClassUtils;
 import org.springframework.util.StringValueResolver;
 
 /**
- * A factory for a {@link FormattingConversionService} that installs default
- * and custom converters and formatters for common types such as numbers 
- * and datetimes .
- *
+ * <p>A factory for a {@link FormattingConversionService} that installs default 
+ * converters and formatters for common types such as numbers and datetimes.
+ * 
+ * <p>Converters and formatters can be registered declaratively through 
+ * {@link #setConverters(Set)} and {@link #setFormatters(Set)}. Another option
+ * is to register converters and formatters in code by implementing the 
+ * {@link FormatterRegistrar} interface. You can then configure provide the set 
+ * of registrars to use through {@link #setFormatterRegistrars(Set)}.
+ * 
+ * <p>A good example for registering converters and formatters in code is 
+ * <code>JodaTimeFormatterRegistrar</code>, which registers a number of 
+ * date-related formatters and converters. For a more detailed list of cases
+ * see {@link #setFormatterRegistrars(Set)} 
+ * 
  * @author Keith Donald
  * @author Juergen Hoeller
+ * @author Rossen Stoyanchev
  * @since 3.0
  */
 public class FormattingConversionServiceFactoryBean
@@ -56,15 +68,19 @@ public class FormattingConversionServiceFactoryBean
 
 	private Set<?> formatters;
 
+	private Set<FormatterRegistrar> formatterRegistrars;
+
 	private StringValueResolver embeddedValueResolver;
 
 	private FormattingConversionService conversionService;
 
+	private boolean registerDefaultFormatters = true;
+
 	/**
 	 * Configure the set of custom converter objects that should be added.
-	 * @param converters instances of 
+	 * @param converters instances of any of the following:
 	 * 		{@link org.springframework.core.convert.converter.Converter},
-	 * 		{@link org.springframework.core.convert.converter.ConverterFactory} or
+	 * 		{@link org.springframework.core.convert.converter.ConverterFactory},
 	 * 		{@link org.springframework.core.convert.converter.GenericConverter}.
 	 */
 	public void setConverters(Set<?> converters) {
@@ -73,22 +89,53 @@ public class FormattingConversionServiceFactoryBean
 
 	/**
 	 * Configure the set of custom formatter objects that should be added.
-	 * @param formatters instances of {@link Formatter} or {@link AnnotationFormatterFactory}.
+	 * @param formatters instances of {@link Formatter} or 
+	 * 		{@link AnnotationFormatterFactory}.
 	 */
 	public void setFormatters(Set<?> formatters) {
 		this.formatters = formatters;
 	}
 
+	/**
+	 * <p>Configure the set of FormatterRegistrars to invoke to register 
+	 * Converters and Formatters in addition to those added declaratively 
+	 * via {@link #setConverters(Set)} and {@link #setFormatters(Set)}.
+	 * <p>FormatterRegistrars are useful when registering multiple related 
+	 * converters and formatters for a formatting category, such as Date 
+	 * formatting. All types related needed to support the formatting 
+	 * category can be registered from one place.
+	 * <p>FormatterRegistrars can also be used to register Formatters 
+	 * indexed under a specific field type different from its own &lt;T&gt;, 
+	 * or when registering a Formatter from a Printer/Parser pair.
+	 * @see FormatterRegistry#addFormatterForFieldType(Class, Formatter)
+	 * @see FormatterRegistry#addFormatterForFieldType(Class, Printer, Parser)
+	 */
+	public void setFormatterRegistrars(Set<FormatterRegistrar> formatterRegistrars) {
+		this.formatterRegistrars = formatterRegistrars;
+	}
+
 	public void setEmbeddedValueResolver(StringValueResolver embeddedValueResolver) {
 		this.embeddedValueResolver = embeddedValueResolver;
 	}
 
+	/**
+	 * Indicates whether default formatters should be registered or not. By 
+	 * default built-in formatters are registered. This flag can be used to 
+	 * turn that off and rely on explicitly registered formatters only.
+	 * @see #setFormatters(Set)
+	 * @see #setFormatterRegistrars(Set)
+	 */
+	public void setRegisterDefaultFormatters(boolean registerDefaultFormatters) {
+		this.registerDefaultFormatters = registerDefaultFormatters;
+	}
+
 	public void afterPropertiesSet() {
 		this.conversionService = new FormattingConversionService();
 		this.conversionService.setEmbeddedValueResolver(this.embeddedValueResolver);
 		ConversionServiceFactory.addDefaultConverters(this.conversionService);
 		ConversionServiceFactory.registerConverters(this.converters, this.conversionService);
-		installFormatters(this.conversionService);
+		addDefaultFormatters();
+		registerFormatters();
 	}
 
 
@@ -110,17 +157,30 @@ public class FormattingConversionServiceFactoryBean
 	// subclassing hooks
 
 	/**
-	 * Install Formatters and Converters into the new FormattingConversionService using the FormatterRegistry SPI.
-	 * Subclasses may override to customize the set of formatters and/or converters that are installed.
+	 * Subclasses may override this method to register formatters and/or converters. 
+	 * Starting with Spring 3.1 however the recommended way of doing that is to 
+	 * through FormatterRegistrars.
+	 * @see #setFormatters(Set)
+	 * @see #setFormatterRegistrars(Set) 
 	 */
 	protected void installFormatters(FormatterRegistry registry) {
-		registry.addFormatterForFieldAnnotation(new NumberFormatAnnotationFormatterFactory());
-		if (jodaTimePresent) {
-			new JodaTimeFormattingConfigurer().installJodaTimeFormatting(registry);			
-		}
-		else {
-			registry.addFormatterForFieldAnnotation(new NoJodaDateTimeFormatAnnotationFormatterFactory());
+	}
+
+	// private helper methods
+
+	private void addDefaultFormatters() {
+		if (registerDefaultFormatters) {
+			this.conversionService.addFormatterForFieldAnnotation(new NumberFormatAnnotationFormatterFactory());
+			if (jodaTimePresent) {
+				new JodaTimeFormatterRegistrar().registerFormatters(this.conversionService);
+			} else {
+				this.conversionService
+						.addFormatterForFieldAnnotation(new NoJodaDateTimeFormatAnnotationFormatterFactory());
+			}
 		}
+	}
+
+	private void registerFormatters() {
 		if (this.formatters != null) {
 			for (Object formatter : this.formatters) {
 				if (formatter instanceof Formatter<?>) {
@@ -133,9 +193,14 @@ public class FormattingConversionServiceFactoryBean
 				}
 			}
 		}
+		if (this.formatterRegistrars != null) {
+			for (FormatterRegistrar registrar : this.formatterRegistrars) {
+				registrar.registerFormatters(this.conversionService);
+			}
+		}
+		installFormatters(this.conversionService);
 	}
 
-
 	/**
 	 * Dummy AnnotationFormatterFactory that simply fails if @DateTimeFormat is being used
 	 * without the JodaTime library being present.

org.springframework.context/src/test/java/org/springframework/format/datetime/joda/JodaTimeFormattingTests.java

@@ -16,6 +16,8 @@
 
 package org.springframework.format.datetime.joda;
 
+import static org.junit.Assert.assertEquals;
+
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
@@ -28,10 +30,8 @@ import org.joda.time.LocalDate;
 import org.joda.time.LocalDateTime;
 import org.joda.time.LocalTime;
 import org.junit.After;
-import static org.junit.Assert.*;
 import org.junit.Before;
 import org.junit.Test;
-
 import org.springframework.beans.MutablePropertyValues;
 import org.springframework.context.i18n.LocaleContextHolder;
 import org.springframework.core.convert.support.ConversionServiceFactory;
@@ -54,8 +54,8 @@ public class JodaTimeFormattingTests {
 	public void setUp() {
 		ConversionServiceFactory.addDefaultConverters(conversionService);
 
-		JodaTimeFormattingConfigurer configurer = new JodaTimeFormattingConfigurer();
-		configurer.installJodaTimeFormatting(conversionService);
+		JodaTimeFormatterRegistrar registrar = new JodaTimeFormatterRegistrar();
+		registrar.registerFormatters(conversionService);
 
 		JodaTimeBean bean = new JodaTimeBean();
 		bean.getChildren().add(new JodaTimeBean());