/*
 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 *
 *
 *
 *
 */


package javax.print.attribute;

import java.io.Serializable;
import java.net.URI;

/**
 * Class URISyntax is an abstract base class providing the common
 * implementation of all attributes whose value is a Uniform Resource
 * Identifier (URI). Once constructed, a URI attribute's value is immutable.
 * <P>
 *
 * @author Alan Kaminsky
 */
public abstract class URISyntax implements Serializable, Cloneable {

 private static final long serialVersionUID = -7842661210486401678L;

 /**
 * URI value of this URI attribute.
 * @serial
 */
 private URI uri;

 /**
 * Constructs a URI attribute with the specified URI.
 *
 * @param uri URI.
 *
 * @exception NullPointerException
 * (unchecked exception) Thrown if <CODE>uri</CODE> is null.
 */
 protected URISyntax(URI uri) {
 this.uri = verify (uri);
 }

 private static URI verify(URI uri) {
 if (uri == null) {
 throw new NullPointerException(" uri is null");
 }
 return uri;
 }

 /**
 * Returns this URI attribute's URI value.
 * @return the URI.
 */
 public URI getURI() {
 return uri;
 }

 /**
 * Returns a hashcode for this URI attribute.
 *
 * @return A hashcode value for this object.
 */
 public int hashCode() {
 return uri.hashCode();
 }

 /**
 * Returns whether this URI 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 URISyntax.
 * <LI>
 * This URI attribute's underlying URI and <CODE>object</CODE>'s
 * underlying URI are equal.
 * </OL>
 *
 * @param object Object to compare to.
 *
 * @return True if <CODE>object</CODE> is equivalent to this URI
 * attribute, false otherwise.
 */
 public boolean equals(Object object) {
 return(object != null &&
 object instanceof URISyntax &&
 this.uri.equals (((URISyntax) object).uri));
 }

 /**
 * Returns a String identifying this URI attribute. The String is the
 * string representation of the attribute's underlying URI.
 *
 * @return A String identifying this object.
 */
 public String toString() {
 return uri.toString();
 }

}