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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.rapiddweller.common.converter;

import com.rapiddweller.common.ConversionException;
import com.rapiddweller.common.Patterns;
import com.rapiddweller.common.StringUtil;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

/**
 * Converts Strings of standard date(time) format (yyyy-MM-dd[Thh:mm[:ss[.SSS]]]) to dates.
 * Created: 07.09.2007 09:07:12
 *
 * @param  the {@link Date} type to convert to
 * @author Volker Bergmann
 */
public class String2DateConverter extends ThreadSafeConverter implements Patterns {

  // TODO support time zones (like 'Z', '+01:00' or '-01:30')

  private final String pattern;
  private final Locale locale;

  /**
   * Instantiates a new String 2 date converter.
   */
  public String2DateConverter() {
    this(null);
  }

  /**
   * Instantiates a new String 2 date converter.
   *
   * @param pattern the pattern
   */
  public String2DateConverter(String pattern) {
    this(pattern, Locale.getDefault());
  }

  /**
   * Instantiates a new String 2 date converter.
   *
   * @param pattern the pattern
   * @param locale  the locale
   */
  @SuppressWarnings("unchecked")
  public String2DateConverter(String pattern, Locale locale) {
    this(pattern, locale, (Class) java.util.Date.class);
  }

  /**
   * Instantiates a new String 2 date converter.
   *
   * @param pattern    the pattern
   * @param locale     the locale
   * @param targetType the target type
   */
  public String2DateConverter(String pattern, Locale locale, Class targetType) {
    super(String.class, targetType);
    this.pattern = pattern;
    this.locale = locale;
  }

  @Override
  @SuppressWarnings("unchecked")
  public E convert(String sourceValue) {
    return (E) convert(sourceValue, pattern, locale, targetType);
  }

  /**
   * Convert date.
   *
   * @param          the type parameter
   * @param sourceValue the source value
   * @param pattern     the pattern
   * @param locale      the locale
   * @param targetType  the target type
   * @return the date
   */
  public static  Date convert(String sourceValue, String pattern, Locale locale, Class targetType) {
    sourceValue = StringUtil.trimmedEmptyToNull(sourceValue);
    if (sourceValue == null) {
      return null;
    }
    try {
      DateFormat format;
      sourceValue = sourceValue.replace(' ', 'T');
      if (pattern != null) {
        format = new SimpleDateFormat(pattern, locale);
      } else if (sourceValue.indexOf('T') > 0) {
        switch (sourceValue.length()) {
          case 16:
            format = new SimpleDateFormat(DEFAULT_DATETIME_MINUTES_PATTERN);
            break;
          case 19:
            format = new SimpleDateFormat(DEFAULT_DATETIME_SECONDS_PATTERN);
            break;
          case 23:
            format = new SimpleDateFormat(DEFAULT_DATETIME_MILLIS_PATTERN);
            break;
          default:
            throw new IllegalArgumentException("Not a supported date format: " + sourceValue);
        }
      } else {
        format = new SimpleDateFormat(DEFAULT_DATE_PATTERN);
      }
      java.util.Date simpleDate = format.parse(sourceValue);
      if (targetType == java.util.Date.class) {
        return simpleDate;
      } else if (targetType == java.sql.Date.class) {
        return new java.sql.Date(simpleDate.getTime());
      } else if (targetType == java.sql.Timestamp.class) {
        return new java.sql.Timestamp(simpleDate.getTime());
      } else {
        throw new UnsupportedOperationException("Not a supported target type: " + targetType);
      }
    } catch (ParseException e) {
      throw new ConversionException(e);
    }
  }

}