/*
* Copyright (c) 2001-2007, Inversoft Inc., All Rights Reserved
*
* 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.primeframework.mvc.parameter.convert.converters;
import java.lang.reflect.Type;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
import org.primeframework.mvc.config.MVCConfiguration;
import org.primeframework.mvc.parameter.convert.AbstractGlobalConverter;
import org.primeframework.mvc.parameter.convert.ConversionException;
import org.primeframework.mvc.parameter.convert.ConverterStateException;
import org.primeframework.mvc.parameter.convert.annotation.GlobalConverter;
import com.google.inject.Inject;
/**
* This converts to and from Enums.
*
* @author Brian Pontarelli
*/
@GlobalConverter
@SuppressWarnings("unchecked")
public class EnumConverter extends AbstractGlobalConverter {
private final boolean emptyIsNull;
@Inject
public EnumConverter(MVCConfiguration configuration) {
this.emptyIsNull = configuration.emptyParametersAreNull();
}
protected Object stringToObject(String value, Type convertTo, Map<String, String> attributes, String expression)
throws ConversionException, ConverterStateException {
if (emptyIsNull && StringUtils.isBlank(value)) {
return null;
}
try {
return Enum.valueOf((Class<Enum>) convertTo, value);
} catch (IllegalArgumentException e) {
throw new ConversionException(e);
}
}
protected Object stringsToObject(String[] values, Type convertTo, Map<String, String> attributes, String expression)
throws ConversionException, ConverterStateException {
throw new UnsupportedOperationException("You are attempting to map a form field that contains " +
"multiple parameters to a property on the action class that is of type Enum. This isn't " +
"allowed.");
}
protected String objectToString(Object value, Type convertFrom, Map<String, String> attributes, String expression)
throws ConversionException, ConverterStateException {
return value.toString();
}
}