annotation driven number formatting with default number formatting rules

org.springframework.context/src/main/java/org/springframework/format/number/NumberFormatAnnotationFormatterFactory.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2002-2009 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.number;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.springframework.format.AnnotationFormatterFactory;
+import org.springframework.format.Formatter;
+import org.springframework.format.Parser;
+import org.springframework.format.Printer;
+import org.springframework.format.annotation.NumberFormat;
+import org.springframework.format.annotation.NumberFormat.Style;
+
+/**
+ * Formats fields annotated with the {@link NumberFormat} annotation.
+ * @author Keith Donald
+ * @since 3.0
+ * @see NumberFormat
+ */
+public final class NumberFormatAnnotationFormatterFactory implements AnnotationFormatterFactory<NumberFormat> {
+
+	private final Set<Class<?>> fieldTypes;
+	
+	public NumberFormatAnnotationFormatterFactory() {
+		this.fieldTypes = Collections.unmodifiableSet(createFieldTypes());
+	}
+
+	public Set<Class<?>> getFieldTypes() {
+		return this.fieldTypes;
+	}
+
+	public Printer<Number> getPrinter(NumberFormat annotation, Class<?> fieldType) {
+		return configureFormatterFrom(annotation, fieldType);
+	}
+	
+	public Parser<Number> getParser(NumberFormat annotation, Class<?> fieldType) {
+		return configureFormatterFrom(annotation, fieldType);
+	}
+
+	
+	// internal helpers
+	
+	private Set<Class<?>> createFieldTypes() {
+		Set<Class<?>> fieldTypes = new HashSet<Class<?>>(7);
+		fieldTypes.add(Short.class);
+		fieldTypes.add(Integer.class);
+		fieldTypes.add(Long.class);
+		fieldTypes.add(Float.class);
+		fieldTypes.add(Double.class);
+		fieldTypes.add(BigDecimal.class);
+		fieldTypes.add(BigInteger.class);
+		return fieldTypes;
+	}
+
+	private Formatter<Number> configureFormatterFrom(NumberFormat annotation, Class<?> fieldType) {
+		if (!annotation.pattern().isEmpty()) {
+			return new NumberFormatter(annotation.pattern());
+		} else {
+			Style style = annotation.style();
+			if (style == Style.PERCENT) {
+				return new PercentFormatter();
+			} else if (style == Style.CURRENCY) {
+				return new CurrencyFormatter();
+			} else {
+				return new NumberFormatter();
+			}
+		}
+	}
+
+}