| /* |
| * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package javax.print.attribute; |
| |
| import java.io.Serializable; |
| import java.util.Date; |
| |
| /** |
| * Class {@code DateTimeSyntax} is an abstract base class providing the common |
| * implementation of all attributes whose value is a date and time. |
| * <p> |
| * Under the hood, a date-time attribute is stored as a value of class |
| * {@code java.util.Date}. You can get a date-time attribute's {@code Date} |
| * value by calling {@link #getValue() getValue()}. A date-time attribute's |
| * {@code Date} value is established when it is constructed (see |
| * {@link #DateTimeSyntax(Date) DateTimeSyntax(Date)}). Once constructed, a |
| * date-time attribute's value is immutable. |
| * <p> |
| * To construct a date-time attribute from separate values of the year, month, |
| * day, hour, minute, and so on, use a {@code java.util.Calendar} object to |
| * construct a {@code java.util.Date} object, then use the |
| * {@code java.util.Date} object to construct the date-time attribute. To |
| * convert a date-time attribute to separate values of the year, month, day, |
| * hour, minute, and so on, create a {@code java.util.Calendar} object and set |
| * it to the {@code java.util.Date} from the date-time attribute. Class |
| * {@code DateTimeSyntax} stores its value in the form of a |
| * {@code java.util.Date} rather than a {@code java.util.Calendar} because it |
| * typically takes less memory to store and less time to compare a |
| * {@code java.util.Date} than a {@code java.util.Calendar}. |
| * |
| * @author Alan Kaminsky |
| */ |
| public abstract class DateTimeSyntax implements Serializable, Cloneable { |
| |
| /** |
| * Use serialVersionUID from JDK 1.4 for interoperability. |
| */ |
| private static final long serialVersionUID = -1400819079791208582L; |
| |
| // Hidden data members. |
| |
| /** |
| * This date-time attribute's {@code java.util.Date} value. |
| * |
| * @serial |
| */ |
| private Date value; |
| |
| // Hidden constructors. |
| |
| /** |
| * Construct a new date-time attribute with the given {@code java.util.Date} |
| * value. |
| * |
| * @param value {@code java.util.Date} value |
| * @throws NullPointerException if {@code value} is {@code null} |
| */ |
| protected DateTimeSyntax(Date value) { |
| if (value == null) { |
| throw new NullPointerException("value is null"); |
| } |
| this.value = value; |
| } |
| |
| // Exported operations. |
| |
| /** |
| * Returns this date-time attribute's {@code java.util.Date} value. |
| * |
| * @return the {@code Date} |
| */ |
| public Date getValue() { |
| return new Date (value.getTime()); |
| } |
| |
| // Exported operations inherited and overridden from class Object. |
| |
| /** |
| * Returns whether this date-time attribute is equivalent to the passed in |
| * object. To be equivalent, all of the following conditions must be true: |
| * <ol type=1> |
| * <li>{@code object} is not {@code null}. |
| * <li>{@code object} is an instance of class {@code DateTimeSyntax}. |
| * <li>This date-time attribute's {@code java.util.Date} value and |
| * {@code object}'s {@code java.util.Date} value are equal. |
| * </ol> |
| * |
| * @param object {@code Object} to compare to |
| * @return {@code true} if {@code object} is equivalent to this date-time |
| * attribute, {@code false} otherwise |
| */ |
| public boolean equals(Object object) { |
| return (object != null && |
| object instanceof DateTimeSyntax && |
| value.equals(((DateTimeSyntax) object).value)); |
| } |
| |
| /** |
| * Returns a hash code value for this date-time attribute. The hashcode is |
| * that of this attribute's {@code java.util.Date} value. |
| */ |
| public int hashCode() { |
| return value.hashCode(); |
| } |
| |
| /** |
| * Returns a string value corresponding to this date-time attribute. The |
| * string value is just this attribute's {@code java.util.Date} value |
| * converted to a string. |
| */ |
| public String toString() { |
| return "" + value; |
| } |
| } |