/* * Copyright (c) 2000, 2004, 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.Locale; /** * Class TextSyntax is an abstract base class providing the common * implementation of all attributes whose value is a string. The text attribute * includes a locale to indicate the natural language. Thus, a text attribute * always represents a localized string. Once constructed, a text attribute's * value is immutable. * <P> * * @author  David Mendenhall * @author  Alan Kaminsky */public abstract class TextSyntax implements Serializable, Cloneable {     private static final long serialVersionUID = -8130648736378144102L;     /**     * String value of this text attribute.     * @serial     */    private String value;     /**     * Locale of this text attribute.     * @serial     */    private Locale locale;     /**     * Constructs a TextAttribute with the specified string and locale.     *     * @param  value   Text string.     * @param  locale  Natural language of the text string. null     * is interpreted to mean the default locale for as returned     * by <code>Locale.getDefault()</code>     *     * @exception  NullPointerException     *     (unchecked exception) Thrown if <CODE>value</CODE> is null.     */    protected TextSyntax(String value, Locale locale) {        this.value = verify (value);        this.locale = verify (locale);    }     private static String verify(String value) {        if (value == null) {            throw new NullPointerException(" value is null");        }        return value;    }     private static Locale verify(Locale locale) {        if (locale == null) {            return Locale.getDefault();        }        return locale;    }     /**     * Returns this text attribute's text string.     * @return the text string.     */    public String getValue() {        return value;    }     /**     * Returns this text attribute's text string's natural language (locale).     * @return the locale     */    public Locale getLocale() {        return locale;    }     /**     * Returns a hashcode for this text attribute.     *     * @return  A hashcode value for this object.     */    public int hashCode() {        return value.hashCode() ^ locale.hashCode();    }     /**     * Returns whether this text 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</CODE> is not null.     * <LI>     * <CODE>object</CODE> is an instance of class TextSyntax.     * <LI>     * This text attribute's underlying string and <CODE>object</CODE>'s     * underlying string are equal.     * <LI>     * This text attribute's locale and <CODE>object</CODE>'s locale are     * equal.     * </OL>     *     * @param  object  Object to compare to.     *     * @return  True if <CODE>object</CODE> is equivalent to this text     *          attribute, false otherwise.     */    public boolean equals(Object object) {        return(object != null &&               object instanceof TextSyntax &&               this.value.equals (((TextSyntax) object).value) &&               this.locale.equals (((TextSyntax) object).locale));    }     /**     * Returns a String identifying this text attribute. The String is     * the attribute's underlying text string.     *     * @return  A String identifying this object.     */    public String toString(){        return value;    } }