IntegerConverterFactory.java

/*****************************************************************************
 * Copyright 2011 Zdenko Vrabel
 *
 * 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.zdevra.guice.mvc.converters;

import java.lang.annotation.Annotation;
import java.util.Map;

import org.zdevra.guice.mvc.ConversionService.Converter;
import org.zdevra.guice.mvc.ConversionService.ConverterFactory;

/**
 * The factory creates a converter which provide conversion of integer values
 */
public class IntegerConverterFactory implements ConverterFactory {

    private final static Converter<Integer> integerConverter = new IntegerConverter();
    private final static Converter<Integer[]> integerArrayConverter = new IntegerArrayConverter();
    private final static Converter<int[]> intArrayConverter = new IntArrayConverter();


    /**
     * {@inheritDoc}
     *
     * @param type
     * @param annotations
     * @return
     */
    @Override
    public Converter<?> createConverter(Class<?> type, Annotation[] annotations) {
        if ((type == Integer.class) || (type == int.class)) {
            return integerConverter;
        } else if (type == Integer[].class) {
            return integerArrayConverter;
        } else if (type == int[].class) {
            return intArrayConverter;
        }

        return null;
    }

    /**
     * Nested converter string -> Integer
     */
    private static class IntegerConverter extends TypeConverter<Integer> {

        @Override
        protected Integer convertType(String stringValue) {
            return Integer.parseInt(stringValue);
        }
    }

    /**
     * Nested converter string[] -> integer[]
     */
    private static class IntArrayConverter implements Converter<int[]> {

        @Override
        public int[] convert(String name, Map<String, String[]> data) {
            String[] values = data.get(name);
            if (values == null) {
                return new int[]{};
            }

            int[] out = new int[values.length];
            for (int i = 0; i < values.length; ++i) {
                out[i] = Integer.parseInt(values[i]);
            }
            return out;
        }
    }

    /**
     * Nested converter string[] -> Integer[]
     */
    private static class IntegerArrayConverter implements Converter<Integer[]> {

        @Override
        public Integer[] convert(String name, Map<String, String[]> data) {
            String[] values = data.get(name);
            if (values == null) {
                return new Integer[]{};
            }

            Integer[] out = new Integer[values.length];
            for (int i = 0; i < values.length; ++i) {
                out[i] = Integer.parseInt(values[i]);
            }
            return out;
        }
    }
}