org.apache.bval.jsr303.util.EnumerationConverter Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.bval.jsr303.util;
import org.apache.commons.beanutils.Converter;
/**
* A {@code org.apache.commons.beanutils.Converter} implementation to handle
* Enumeration type.
*
* $Id: EnumerationConverter.java 962601 2010-07-09 16:31:15Z carlosvara $
*/
public final class EnumerationConverter implements Converter {
/**
* The static converter instance.
*/
private static final EnumerationConverter INSTANCE = new EnumerationConverter();
/**
* Returns this converter instance.
*
* @return this converter instance.
*/
public static EnumerationConverter getInstance() {
return INSTANCE;
}
/**
* This class can't be instantiated.
*/
private EnumerationConverter() {
// do nothing
}
/**
* {@inheritDoc}
*/
@SuppressWarnings("unchecked")
public Object convert(Class type, Object value) {
if (!type.isEnum()) {
throw new RuntimeException("Only enum types supported in this version!");
}
if (value == null) {
throw new RuntimeException("Null values not supported in this version!");
}
if (String.class != value.getClass()) {
throw new RuntimeException("Only java.lang.String values supported in this version!");
}
String stringValue = (String) value;
final Class enumClass = (Class) type;
return Enum.valueOf(enumClass, stringValue);
}
}