simplifieddateformat.java

基于UDP的可靠邮件系统

/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * 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.                      *
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package org.hwmhere.email.impl.util;

import java.text.ParseException;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

/**
 * <p>This interface is designed to provide a simplified subset of the
 * methods provided by the <code>java.text.DateFormat</code> class.</p>
 *
 * <p>This interface is necessary because of the difficulty in writing
 * thread safe classes that inherit from <code>java.text.DateFormat</code>.
 * This difficulty leads us to approach the problem using composition
 * rather than inheritance.  In general classes that implement this
 * interface will delegate these calls to an internal DateFormat object.</p>
 *    
 */
public interface SimplifiedDateFormat {

    /**
     * Formats a Date into a date/time string.
     * @param date the time value to be formatted into a time string.
     * @return the formatted time string.
     */
    public String format(Date d);

    /**
     * Parses text from the beginning of the given string to produce a date.
     * The method may not use the entire text of the given string.
     *
     * @param source A <code>String</code> whose beginning should be parsed.
     * @return A <code>Date</code> parsed from the string.
     * @throws ParseException if the beginning of the specified string
     *         cannot be parsed.
     */
    public Date parse(String source) throws ParseException;

    /**
     * Sets the time zone of this SimplifiedDateFormat object.
     * @param zone the given new time zone.
     */
    public void setTimeZone(TimeZone zone);

    /**
     * Gets the time zone.
     * @return the time zone associated with this SimplifiedDateFormat.
     */
    public TimeZone getTimeZone();

    /**
     * Specify whether or not date/time parsing is to be lenient.  With
     * lenient parsing, the parser may use heuristics to interpret inputs that
     * do not precisely match this object's format.  With strict parsing,
     * inputs must match this object's format.
     * @param lenient when true, parsing is lenient
     * @see java.util.Calendar#setLenient
     */
    public void setLenient(boolean lenient);

    /**
     * Tell whether date/time parsing is to be lenient.
     * @return whether this SimplifiedDateFormat is lenient.
     */
    public boolean isLenient();
}