/*
 * Copyright 2014 Attila Szegedi, Daniel Dekany, Jonathan Revusky
 * 
 * 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 freemarker.core;

import java.util.Locale;

import freemarker.template.TemplateModelException;
import freemarker.template.TemplateNumberModel;
import freemarker.template.utility.NumberUtil;

public class HexTemplateNumberFormatFactory extends TemplateNumberFormatFactory {

    public static final HexTemplateNumberFormatFactory INSTANCE = new HexTemplateNumberFormatFactory();
    
    private HexTemplateNumberFormatFactory() {
        // Defined to decrease visibility
    }
    
    @Override
    public TemplateNumberFormat get(String params, Locale locale, Environment env)
            throws InvalidFormatParametersException {
        TemplateFormatUtil.checkHasNoParameters(params);
        return HexTemplateNumberFormat.INSTANCE;
    }

    private static class HexTemplateNumberFormat extends TemplateNumberFormat {

        private static final HexTemplateNumberFormat INSTANCE = new HexTemplateNumberFormat();
        
        private HexTemplateNumberFormat() { }
        
        @Override
        public String format(TemplateNumberModel numberModel)
                throws UnformattableNumberException, TemplateModelException {
            Number n = TemplateFormatUtil.getNonNullNumber(numberModel);
            try {
                return Integer.toHexString(NumberUtil.toIntExact(n));
            } catch (ArithmeticException e) {
                throw new UnformattableNumberException(n + " doesn't fit into an int");
            }
        }

        @Override
        public <MO extends TemplateMarkupOutputModel> MO format(TemplateNumberModel dateModel,
                MarkupOutputFormat<MO> outputFormat) throws UnformattableNumberException, TemplateModelException {
            return null;
        }

        @Override
        public boolean isLocaleBound() {
            return false;
        }

        @Override
        public String getDescription() {
            return "hexadecimal int";
        }
        
    }

}