boolean formatter

spring-binding/src/main/java/org/springframework/binding/format/factories/BooleanFormatterFactory.java

@@ -0,0 +1,49 @@
+package org.springframework.binding.format.factories;
+
+import org.springframework.binding.format.Formatter;
+import org.springframework.binding.format.FormatterFactory;
+import org.springframework.binding.format.FormatterFactoryContext;
+import org.springframework.binding.format.InvalidFormatException;
+import org.springframework.util.StringUtils;
+
+public class BooleanFormatterFactory implements FormatterFactory {
+
+	public Class getFormattedClass() {
+		return Boolean.class;
+	}
+
+	public Formatter createFormatter(FormatterFactoryContext context) {
+		return new BooleanFormatter();
+	}
+
+	public static class BooleanFormatter implements Formatter {
+
+		public String formatValue(Object value) throws IllegalArgumentException {
+			if (value == null) {
+				return "";
+			}
+			if (Boolean.TRUE.equals(value)) {
+				return "true";
+			} else if (Boolean.FALSE.equals(value)) {
+				return "false";
+			} else {
+				throw new IllegalArgumentException("Must be a Boolean " + value);
+			}
+		}
+
+		public Object parseValue(String formattedString) throws InvalidFormatException {
+			formattedString = (formattedString != null ? formattedString.trim() : null);
+			if (!StringUtils.hasText(formattedString)) {
+				return null;
+			}
+			if (formattedString.equals("true")) {
+				return Boolean.TRUE;
+			} else if (formattedString.equals("false")) {
+				return Boolean.FALSE;
+			} else {
+				throw new InvalidFormatException(formattedString, "true | false");
+			}
+		}
+	}
+
+}