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Library with support for certain re-ocurring standard business objects
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/**
 * Copyright (C) 2006-2014 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * 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.phloc.masterdata.ean;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import com.phloc.commons.ValueEnforcer;
import com.phloc.commons.state.EValidity;
import com.phloc.commons.string.StringHelper;

/**
 * Validator and checksum creator for EAN13 code (=GTIN-13 and GLN)
 * 
 * @author Philip Helger
 */
public final class EAN13 extends AbstractUPCEAN
{
  /**
   * Constructor
   * 
   * @param sMsg
   *        The code string.
   */
  public EAN13 (@Nonnull final String sMsg)
  {
    this (sMsg, DEFAULT_CHECKSUM_MODE);
  }

  /**
   * Constructor
   * 
   * @param sMsg
   *        The code string.
   * @param eMode
   *        the checksum mode
   */
  public EAN13 (@Nonnull final String sMsg, @Nonnull final EEANChecksumMode eMode)
  {
    super (sMsg, eMode);
  }

  @Override
  @Nonnull
  public EValidity validate ()
  {
    return validateMessage (getMessage ());
  }

  /**
   * Validates a EAN-13 message. The method throws IllegalArgumentExceptions if
   * an invalid message is passed.
   * 
   * @param sMsg
   *        the message to validate
   * @return {@link EValidity#VALID} if the msg is valid,
   *         {@link EValidity#INVALID} otherwise.
   */
  @Nonnull
  public static EValidity validateMessage (@Nullable final String sMsg)
  {
    final int nLen = StringHelper.getLength (sMsg);
    if (nLen >= 12 && nLen <= 13)
      if (AbstractUPCEAN.validateMessage (sMsg).isValid ())
        return EValidity.VALID;
    return EValidity.INVALID;
  }

  @Nonnull
  public String getWithCorrectChecksum ()
  {
    return getWithCorrectChecksum (getMessage (), getChecksumMode ());
  }

  @Nonnull
  public static String getWithCorrectChecksum (@Nonnull final String sMsg, @Nonnull final EEANChecksumMode eMode) throws IllegalArgumentException
  {
    ValueEnforcer.notNull (sMsg, "Msg");
    ValueEnforcer.notNull (eMode, "ChecksumMode");

    EEANChecksumMode eRealMode = eMode;
    if (eRealMode == EEANChecksumMode.AUTO)
    {
      if (sMsg.length () == 12)
        eRealMode = EEANChecksumMode.ADD;
      else
        if (sMsg.length () == 13)
          eRealMode = EEANChecksumMode.CHECK;
        else
        {
          // Shouldn't happen because of validateMessage
          throw new IllegalArgumentException ("Failed to automatically detect the checksum mode");
        }
    }

    switch (eRealMode)
    {
      case ADD:
      {
        if (sMsg.length () != 12)
          throw new IllegalArgumentException ("Message must be 12 characters long");
        return sMsg + calcChecksumChar (sMsg, 12);
      }
      case CHECK:
      {
        if (sMsg.length () != 13)
          throw new IllegalArgumentException ("Message must be 13 characters long");

        final char cCheck = sMsg.charAt (12);
        final char cExpected = calcChecksumChar (sMsg, 12);
        if (cCheck != cExpected)
          throw new IllegalArgumentException ("Checksum is bad (" + cCheck + "). Expected: " + cExpected);

        return sMsg;
      }
      case IGNORE:
        return sMsg;
      default:
        throw new IllegalArgumentException ("Unknown checksum mode: " + eRealMode);
    }
  }
}