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'databene commons' is an open source Java library 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 org.databene.commons.converter;

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

import org.databene.commons.ConversionException;
import org.databene.commons.Patterns;
import org.databene.commons.StringUtil;

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

	private String pattern;
	
    public String2TimeConverter() {
        this(null);
    }

    public String2TimeConverter(String pattern) {
        super(String.class, Time.class);
        this.pattern = pattern;
    }

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

    public static Time parse(String value) throws ConversionException {
        return parse(value, null);
    }

    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;
    }

}