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/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * 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.
 */
package javax.xml.namespace;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;

/**
 * QName class represents the value of a qualified name
 * as specified in XML
 * Schema Part2: Datatypes specification.
 * 

* The value of a QName contains a namespaceURI, a localPart and a * prefix. The localPart provides the local part of the qualified name. * The namespaceURI is a URI reference identifying the namespace. * * @version 1.1 */ public class QName implements Serializable { /** Comment/shared empty String. */ private static final String emptyString = "".intern(); private String namespaceURI; private String localPart; private String prefix; /** * Constructor for the QName. * * @param localPart local part of the QName */ public QName(String localPart) { this(emptyString, localPart, emptyString); } /** * Constructor for the QName. * * @param namespaceURI namespace URI for the QName * @param localPart local part of the QName. */ public QName(String namespaceURI, String localPart) { this(namespaceURI, localPart, emptyString); } /** * Constructor for the QName. * * @param namespaceURI Namespace URI for the QName * @param localPart Local part of the QName. * @param prefix Prefix of the QName. */ public QName(String namespaceURI, String localPart, String prefix) { this.namespaceURI = (namespaceURI == null) ? emptyString : namespaceURI.intern(); if (localPart == null) { throw new IllegalArgumentException("invalid QName local part"); } else { this.localPart = localPart.intern(); } if (prefix == null) { throw new IllegalArgumentException("invalid QName prefix"); } else { this.prefix = prefix.intern(); } } /** * Gets the namespace URI for this QName. * * @return namespace URI */ public String getNamespaceURI() { return namespaceURI; } /** * Gets the local part for this QName. * * @return the local part */ public String getLocalPart() { return localPart; } /** * Gets the prefix for this QName. * * @return the prefix */ public String getPrefix() { return prefix; } /** * Returns a string representation of this QName. * * @return a string representation of the QName */ public String toString() { return ((namespaceURI == emptyString) ? localPart : '{' + namespaceURI + '}' + localPart); } /** * Tests this QName for equality with another object. *

* If the given object is not a QName or is null then this method * returns false. *

* For two QNames to be considered equal requires that both * localPart and namespaceURI must be equal. This method uses * String.equals to check equality of localPart * and namespaceURI. Any class that extends QName is required * to satisfy this equality contract. *

* This method satisfies the general contract of the Object.equals method. * * @param obj the reference object with which to compare * * @return true if the given object is identical to this * QName: false otherwise. */ public boolean equals(Object obj) { if (obj == this) { return true; } if (!(obj instanceof QName)) { return false; } if ((namespaceURI == ((QName) obj).namespaceURI) && (localPart == ((QName) obj).localPart)) { return true; } return false; } /** * Returns a QName holding the value of the specified String. *

* The string must be in the form returned by the QName.toString() * method, i.e. "{namespaceURI}localPart", with the "{namespaceURI}" * part being optional. *

* This method doesn't do a full validation of the resulting QName. * In particular, it doesn't check that the resulting namespace URI * is a legal URI (per RFC 2396 and RFC 2732), nor that the resulting * local part is a legal NCName per the XML Namespaces specification. * * @param s the string to be parsed * @throws java.lang.IllegalArgumentException If the specified String cannot be parsed as a QName * @return QName corresponding to the given String */ public static QName valueOf(String s) { if ((s == null) || s.equals("")) { throw new IllegalArgumentException("invalid QName literal"); } if (s.charAt(0) == '{') { int i = s.indexOf('}'); if (i == -1) { throw new IllegalArgumentException("invalid QName literal"); } if (i == s.length() - 1) { throw new IllegalArgumentException("invalid QName literal"); } else { return new QName(s.substring(1, i), s.substring(i + 1)); } } else { return new QName(s); } } /** * Returns a hash code value for this QName object. The hash code * is based on both the localPart and namespaceURI parts of the * QName. This method satisfies the general contract of the * Object.hashCode method. * * @return a hash code value for this Qname object */ public int hashCode() { return namespaceURI.hashCode() ^ localPart.hashCode(); } /** * Ensure that deserialization properly interns the results. * @param in the ObjectInputStream to be read * @throws IOException if there was a failure in the object input stream * @throws ClassNotFoundException if the class of any sub-objects could * not be found */ private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); namespaceURI = namespaceURI.intern(); localPart = localPart.intern(); prefix = prefix.intern(); } }





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