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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 com.rapiddweller.common.format.ConcurrentDateFormat;
import com.rapiddweller.common.format.ConcurrentDecimalFormat;

import java.sql.Timestamp;
import java.text.DateFormat;

/**
 * Formats a {@link Timestamp} as {@link String}.
 * Created: 18.02.2010 17:46:14
 *
 * @author Volker Bergmann
 * @since 0.5.0
 */
public class TimestampFormatter extends ThreadSafeConverter {

  private final DateFormat prefixFormat;
  private final ConcurrentDecimalFormat postfixFormat;
  private long nanoDivisor;

  // constructors ----------------------------------------------------------------------------------------------------

  /**
   * Instantiates a new Timestamp formatter.
   */
  public TimestampFormatter() {
    this(Patterns.DEFAULT_TIMESTAMP_PATTERN);
  }

  /**
   * Instantiates a new Timestamp formatter.
   *
   * @param pattern the pattern
   */
  public TimestampFormatter(String pattern) {
    super(Timestamp.class, String.class);

    // calculate the number of postfix digits
    int lastPos = pattern.length() - 1;
    int sepPos = lastPos;
    while (pattern.charAt(sepPos) == 'S') {
      sepPos--;
    }

    // define prefix and postfix patterns
    String prefixPattern;
    prefixPattern = (sepPos < lastPos ? pattern.substring(0, sepPos) : pattern);
    this.prefixFormat = new ConcurrentDateFormat(prefixPattern);
    int postfixDigits = lastPos - sepPos;
    if (postfixDigits > 0) {
      String postfixPattern = new String(StringUtil.fill(new char[postfixDigits], 0, postfixDigits, '0'));
      this.postfixFormat = new ConcurrentDecimalFormat(postfixPattern);
      this.nanoDivisor = (long) Math.pow(10, Math.round(9. - postfixDigits));
    } else {
      this.postfixFormat = null;
    }
  }

  // Converter interface implementation ------------------------------------------------------------------------------

  @Override
  public String convert(Timestamp sourceValue) throws ConversionException {
    return format(sourceValue);
  }

  // static convenience method ---------------------------------------------------------------------------------------

  /**
   * Format string.
   *
   * @param timestamp the timestamp
   * @return the string
   */
  public String format(Timestamp timestamp) {
    if (timestamp == null) {
      return null;
    }
    String result = prefixFormat.format(timestamp);
    if (postfixFormat != null) {
      long postfixDigits = timestamp.getNanos() / nanoDivisor;
      result += '.' + postfixFormat.format(postfixDigits);
    }
    return result;
  }

}