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/*******************************************************************************
 * Copyright (c) quickfixengine.org  All rights reserved.
 *
 * This file is part of the QuickFIX FIX Engine
 *
 * This file may be distributed under the terms of the quickfixengine.org
 * license as defined by quickfixengine.org and appearing in the file
 * LICENSE included in the packaging of this file.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
 * THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE.
 *
 * See http://www.quickfixengine.org/LICENSE for licensing information.
 *
 * Contact [email protected] if any conditions of this licensing
 * are not clear to you.
 ******************************************************************************/

package quickfix.field.converter;

import quickfix.FieldConvertError;

/**
 * Convert between an integer and a String
 */
public final class IntConverter {

    /**
     * Convert and integer to a String
     *
     * @param i the integer to convert
     * @return the String representing the integer
     * @see java.lang.Long#toString(long)
     */
    public static String convert(int i) {
        return Long.toString(i);
    }

    /**
     * Convert a String to an integer.
     *
     * @param value the String to convert
     * @return the converted integer
     * @throws FieldConvertError raised if the String does not represent a valid integer
     * @see java.lang.Integer#parseInt(String)
     */
    public static int convert(String value) throws FieldConvertError {
        try {
            for (int i = 0; i < value.length(); i++) {
                if (!Character.isDigit(value.charAt(i)) && !(i == 0 && value.charAt(i) == '-')) {
                    throw new FieldConvertError("invalid integral value: " + value);
                }
            }
            return Integer.parseInt(value);
        } catch (NumberFormatException e) {
            throw new FieldConvertError("invalid integral value: " + value + ": " + e);
        }
    }
}