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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.sql.Time;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Parses a String as a time value.
 * Created: 14.03.2008 22:15:58
 *
 * @author Volker Bergmann
 */
public class String2TimeConverter extends ThreadSafeConverter {

  private final String pattern;

  /**
   * Instantiates a new String 2 time converter.
   */
  public String2TimeConverter() {
    this(null);
  }

  /**
   * Instantiates a new String 2 time converter.
   *
   * @param pattern the pattern
   */
  public String2TimeConverter(String pattern) {
    super(String.class, Time.class);
    this.pattern = pattern;
  }

  @Override
  public Time convert(String sourceValue) throws ConversionException {
    return parse(sourceValue, pattern);
  }

  /**
   * Parse time.
   *
   * @param value the value
   * @return the time
   * @throws ConversionException the conversion exception
   */
  public static Time parse(String value) throws ConversionException {
    return parse(value, null);
  }

  /**
   * Parse time.
   *
   * @param value   the value
   * @param pattern the pattern
   * @return the time
   * @throws ConversionException the conversion exception
   */
  public static Time parse(String value, String pattern) throws ConversionException {
    if (StringUtil.isEmpty(value)) {
      return null;
    }
    pattern = choosePattern(value, pattern);
    try {
      Date simpleDate = new SimpleDateFormat(pattern).parse(value);
      long millis = simpleDate.getTime();
      return new Time(millis);
    } catch (ParseException e) {
      throw new ConversionException(e);
    }
  }

  private static String choosePattern(String sourceValue, String pattern) {
    if (pattern == null) {
      switch (sourceValue.length()) {
        case 12:
          pattern = Patterns.DEFAULT_TIME_MILLIS_PATTERN;
          break;
        case 8:
          pattern = Patterns.DEFAULT_TIME_SECONDS_PATTERN;
          break;
        case 5:
          pattern = Patterns.DEFAULT_TIME_MINUTES_PATTERN;
          break;
        default:
          throw new IllegalArgumentException("Not a supported time format: " + sourceValue);
      }
    }
    return pattern;
  }

}