polish

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@1914 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.core/src/main/java/org/springframework/core/convert/converter/ConverterInfo.java

@@ -21,12 +21,10 @@ package org.springframework.core.convert.converter;
  *
  * Implementing this interface is required when registering converters that do not declare their
  * parameterized types S and T with a {@link org.springframework.core.convert.ConversionService}.
- * Such Converters are often dynamically created by a {@link ConverterFactory}.
  *
  * @author Keith Donald
  * @since 3.0
  * @see Converter
- * @see ConverterFactory
  */
 public interface ConverterInfo {
 

org.springframework.core/src/main/java/org/springframework/core/convert/support/StringToCharacterConverter.java

@@ -27,8 +27,8 @@ import org.springframework.core.convert.converter.Converter;
 class StringToCharacterConverter implements Converter<String, Character> {
 
 	public Character convert(String source) {
-		if (source.length() == 0) {
-			throw new IllegalArgumentException("Invalid value; to convert to a Character a String must have a length of 1 or greater");
+		if ("".equals(source)) {
+			return null;
 		}
 		return source.charAt(0);
 	}

org.springframework.core/src/main/java/org/springframework/core/convert/support/StringToEnumConverterFactory.java

@@ -18,7 +18,6 @@ package org.springframework.core.convert.support;
 
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.converter.ConverterFactory;
-import org.springframework.core.convert.converter.ConverterInfo;
 
 /**
  * A factory for String to enum converters.
@@ -33,7 +32,7 @@ class StringToEnumConverterFactory implements ConverterFactory<String, Enum> {
 		return new StringToEnum(targetType);
 	}
 
-	private class StringToEnum<T extends Enum> implements Converter<String, T>, ConverterInfo {
+	private class StringToEnum<T extends Enum> implements Converter<String, T> {
 
 		private final Class<T> enumType;
 		
@@ -41,14 +40,6 @@ class StringToEnumConverterFactory implements ConverterFactory<String, Enum> {
 			this.enumType = enumType;
 		}
 
-		public Class<String> getSourceType() {
-			return String.class;
-		}
-
-		public Class<T> getTargetType() {
-			return this.enumType;
-		}
-
 		public T convert(String source) {
 			if ("".equals(source)) {
 				// It's an empty enum identifier: reset the enum value to null.