Add StringToLongConverter for automatic handling of long values (#12291)

Change-Id: Ia2865b199303c0e35b562120f1c916f288aa458a

2 files changed, 80 insertions, 0 deletions

diff --git a/server/src/com/vaadin/data/util/converter/DefaultConverterFactory.java b/server/src/com/vaadin/data/util/converter/DefaultConverterFactory.java
index 0b3cfcd1b0..4d3717e9ba 100644
--- a/server/src/com/vaadin/data/util/converter/DefaultConverterFactory.java
+++ b/server/src/com/vaadin/data/util/converter/DefaultConverterFactory.java
@@ -102,6 +102,8 @@ public class DefaultConverterFactory implements ConverterFactory {
             return new StringToFloatConverter();
         } else if (Integer.class.isAssignableFrom(sourceType)) {
             return new StringToIntegerConverter();
+        } else if (Long.class.isAssignableFrom(sourceType)) {
+            return new StringToLongConverter();
         } else if (BigDecimal.class.isAssignableFrom(sourceType)) {
             return new StringToBigDecimalConverter();
         } else if (Boolean.class.isAssignableFrom(sourceType)) {
diff --git a/server/src/com/vaadin/data/util/converter/StringToLongConverter.java b/server/src/com/vaadin/data/util/converter/StringToLongConverter.java
new file mode 100644
index 0000000000..3532336787
--- /dev/null
+++ b/server/src/com/vaadin/data/util/converter/StringToLongConverter.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2000-2013 Vaadin Ltd.
+ * 
+ * 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 com.vaadin.data.util.converter;
+
+import java.text.NumberFormat;
+import java.util.Locale;
+
+/**
+ * A converter that converts from {@link String} to {@link Long} and back. Uses
+ * the given locale and a {@link NumberFormat} instance for formatting and
+ * parsing.
+ * <p>
+ * Override and overwrite {@link #getFormat(Locale)} to use a different format.
+ * </p>
+ * 
+ * @author Vaadin Ltd
+ * @since 7.2
+ */
+public class StringToLongConverter extends
+        AbstractStringToNumberConverter<Long> {
+
+    /**
+     * Returns the format used by
+     * {@link #convertToPresentation(Long, Class, Locale)} and
+     * {@link #convertToModel(String, Class, Locale)}
+     * 
+     * @param locale
+     *            The locale to use
+     * @return A NumberFormat instance
+     */
+    @Override
+    protected NumberFormat getFormat(Locale locale) {
+        if (locale == null) {
+            locale = Locale.getDefault();
+        }
+        return NumberFormat.getIntegerInstance(locale);
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see
+     * com.vaadin.data.util.converter.Converter#convertToModel(java.lang.Object,
+     * java.lang.Class, java.util.Locale)
+     */
+    @Override
+    public Long convertToModel(String value, Class<? extends Long> targetType,
+            Locale locale) throws ConversionException {
+        Number n = convertToNumber(value, targetType, locale);
+        return n == null ? null : n.longValue();
+
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see com.vaadin.data.util.converter.Converter#getModelType()
+     */
+    @Override
+    public Class<Long> getModelType() {
+        return Long.class;
+    }
+
+}