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The Dolphin Platform is a framework that implements the presentation model pattern and provides amodern way to create enterprise applications. The Platform provides several client implementations that all canbe used in combination with a general sever API.

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/*
 * Copyright 2015-2017 Canoo Engineering AG.
 *
 * 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.canoo.dolphin.impl.converters;

import com.canoo.dolphin.converter.Converter;
import com.canoo.dolphin.converter.ValueConverterException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.HashMap;
import java.util.Map;

public class EnumConverterFactory extends AbstractConverterFactory {

    public final static int FIELD_TYPE_ENUM = 10;

    private final Map, EnumConverter> enumConverters = new HashMap<>();

    @Override
    public boolean supportsType(Class cls) {
        return Enum.class.isAssignableFrom(cls);
    }

    @Override
    public int getTypeIdentifier() {
        return FIELD_TYPE_ENUM;
    }

    @Override
    public Converter getConverterForType(Class cls) {
        EnumConverter enumConverter = enumConverters.get(cls);
        if (enumConverter == null) {
            enumConverter = new EnumConverter(cls);
            enumConverters.put(cls, enumConverter);
        }
        return enumConverter;
    }

    private static class EnumConverter extends AbstractStringConverter {

        private static final Logger LOG = LoggerFactory.getLogger(EnumConverter.class);

        private final Class clazz;

        @SuppressWarnings("unchecked")
        public EnumConverter(Class clazz) {
            this.clazz = (Class) clazz;
        }

        @Override
        public Enum convertFromDolphin(String value) throws ValueConverterException{
            if (value == null) {
                return null;
            }
            try {
                return Enum.valueOf(clazz, value);
            } catch (IllegalArgumentException ex) {
                throw new ValueConverterException("Unable to convert to an enum: " + clazz + ", value: " + value, ex);
            }
        }

        @Override
        public String convertToDolphin(Enum value) throws ValueConverterException{
            if (value == null) {
                return null;
            }
            try {
                return value.name();
            } catch (ClassCastException ex) {
                throw new ValueConverterException("Unable to evaluatethe enum: " + value, ex);
            }
        }
    }

}