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JSefa (Java Simple exchange format api) is a simple library for stream-based serialization of java objects to XML, CSV, FLR or any other format and back again using an iterator-style interface independent of the serialization format. The mapping between java object types and types of the serialization format (e. g. xml complex element types) can be defined either by annotating the java classes or programmatically using a simple API. The current implementation supports XML, CSV and FLR - for XML it is based on JSR 173.

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/*
 * Copyright 2007 the original author or authors.
 *
 * 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 net.sf.jsefa.common.converter;

/**
 * Converter for Integer objects.
 * 
 * It is thread-safe.
 * 
 * @author Norman Lahme-Huetig
 */
public final class IntegerConverter implements SimpleTypeConverter {
    private static final IntegerConverter INSTANCE = new IntegerConverter();

    /**
     * Returns the single IntegerConverter.
     * 
     * @return the single integer converter.
     */
    public static IntegerConverter create() {
        return INSTANCE;
    }

    private IntegerConverter() {

    }

    /**
     * {@inheritDoc}
     */
    public Integer fromString(String value) {
        if (value == null || value.length() == 0) {
            return null;
        }
        try {
            return Integer.valueOf(value);
        } catch (NumberFormatException e) {
            if (value.charAt(0) == '+') {
                return fromString(value.substring(1));
            }
            throw new ConversionException("Wrong Integer format: " + value);
        }
    }

    /**
     * {@inheritDoc}
     */
    public String toString(Object value) {
        if (value == null) {
            return null;
        }
        return value.toString();
    }

}