1 /* 2 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 27 package javax.print.attribute; 28 29 import java.io.Serializable; 30 import java.net.URI; 31 32 /** 33 * Class URISyntax is an abstract base class providing the common 34 * implementation of all attributes whose value is a Uniform Resource 35 * Identifier (URI). Once constructed, a URI attribute's value is immutable. 36 * <P> 37 * 38 * @author Alan Kaminsky 39 */ 40 public abstract class URISyntax implements Serializable, Cloneable { 41 42 private static final long serialVersionUID = -7842661210486401678L; 43 44 /** 45 * URI value of this URI attribute. 46 * @serial 47 */ 48 private URI uri; 49 50 /** 51 * Constructs a URI attribute with the specified URI. 52 * 53 * @param uri URI. 54 * 55 * @exception NullPointerException 56 * (unchecked exception) Thrown if <CODE>uri</CODE> is null. 57 */ 58 protected URISyntax(URI uri) { 59 this.uri = verify (uri); 60 } 61 62 private static URI verify(URI uri) { 63 if (uri == null) { 64 throw new NullPointerException(" uri is null"); 65 } 66 return uri; 67 } 68 69 /** 70 * Returns this URI attribute's URI value. 71 * @return the URI. 72 */ 73 public URI getURI() { 74 return uri; 75 } 76 77 /** 78 * Returns a hashcode for this URI attribute. 79 * 80 * @return A hashcode value for this object. 81 */ 82 public int hashCode() { 83 return uri.hashCode(); 84 } 85 86 /** 87 * Returns whether this URI attribute is equivalent to the passed in 88 * object. 89 * To be equivalent, all of the following conditions must be true: 90 * <OL TYPE=1> 91 * <LI> 92 * <CODE>object</CODE> is not null. 93 * <LI> 94 * <CODE>object</CODE> is an instance of class URISyntax. 95 * <LI> 96 * This URI attribute's underlying URI and <CODE>object</CODE>'s 97 * underlying URI are equal. 98 * </OL> 99 * 100 * @param object Object to compare to. 101 * 102 * @return True if <CODE>object</CODE> is equivalent to this URI 103 * attribute, false otherwise. 104 */ 105 public boolean equals(Object object) { 106 return(object != null && 107 object instanceof URISyntax && 108 this.uri.equals (((URISyntax) object).uri)); 109 } 110 111 /** 112 * Returns a String identifying this URI attribute. The String is the 113 * string representation of the attribute's underlying URI. 114 * 115 * @return A String identifying this object. 116 */ 117 public String toString() { 118 return uri.toString(); 119 } 120 121 }