/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package javax.xml.namespace;
/**
* <p><code>QName</code> represents a <strong>qualified name</strong>
* as defined in the XML specifications: <a
* href="http://www.w3.org/TR/xmlschema-2/#QName">XML Schema Part2:
* Datatypes specification</a>, <a
* href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">Namespaces
* in XML</a>, <a
* href="http://www.w3.org/XML/xml-names-19990114-errata">Namespaces
* in XML Errata</a>.</p>
*
* <p>The value of a <code>QName</code> contains a <strong>Namespace
* URI</strong>, <strong>local part</strong> and
* <strong>prefix</strong>.</p>
*
* <p>The prefix is included in <code>QName</code> to retain lexical
* information <strong><em>when present</em></strong> in an {@link
* javax.xml.transform.Source XML input source}. The prefix is
* <strong><em>NOT</em></strong> used in {@link #equals(Object)
* QName.equals(Object)} or to compute the {@link #hashCode()
* QName.hashCode()}. Equality and the hash code are defined using
* only the Namespace URI and local part.</p>
*
* <p>If not specified, the Namespace URI is set to "" (the empty string).
* If not specified, the prefix is set to "" (the empty string).</p>
*
* <p><code>QName</code> is immutable.</p>
*
* @version 1.1
* @see <a href="http://www.w3.org/TR/xmlschema-2/#QName">XML Schema
* Part2: Datatypes specification</a>
* @see <a
* href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">Namespaces
* in XML</a>
* @see <a
* href="http://www.w3.org/XML/xml-names-19990114-errata">Namespaces
* in XML Errata</a>
*/
public class QName {
/**
* <p>Namespace URI of this <code>QName</code>.</p>
*/
private final String namespaceURI;
/**
* <p>local part of this <code>QName</code>.</p>
*/
private final String localPart;
/**
* <p>prefix of this <code>QName</code>.</p>
*/
private final String prefix;
/**
* <p><code>QName</code> constructor specifying the Namespace URI
* and local part.</p>
*
* <p>If the Namespace URI is <code>null</code>, it is set to "".
* This value represents no
* explicitly defined Namespace as defined by the <a
* href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">Namespaces
* in XML</a> specification. This action preserves compatible
* behavior with QName 1.0.</p>
*
* <p>If the local part is <code>null</code>, an
* <code>IllegalArgumentException</code> is thrown.</p>
*
* <p>When using this constructor, the prefix is set to "".</p>
*
* @param namespaceURI Namespace URI of the <code>QName</code>
* @param localPart local part of the <code>QName</code>
* @see #QName(String namespaceURI, String localPart, String
* prefix) QName(String namespaceURI, String localPart, String
* prefix)
*/
public QName(String namespaceURI, String localPart) {
this(namespaceURI, localPart, "");
}
/**
* <p><code>QName</code> constructor specifying the Namespace URI,
* local part and prefix.</p>
*
* <p>If the Namespace URI is <code>null</code>, it is set to "".
* This value represents no
* explicitly defined Namespace as defined by the <a
* href="http://www.w3.org/TR/REC-xml-names/#ns-qualnames">Namespaces
* in XML</a> specification. This action preserves compatible
* behavior with QName 1.0.</p>
*
* <p>If the local part is <code>null</code>, an
* <code>IllegalArgumentException</code> is thrown.</p>
*
* <p>If the prefix is <code>null</code>, an
* <code>IllegalArgumentException</code> is thrown. Use ""
* to explicitly indicate that no
* prefix is present or the prefix is not relevant.</p>
*
* @param namespaceURI Namespace URI of the <code>QName<code>
* @param localPart local part of the <code>QName<code>
* @param prefix prefix of the <code>QName<code>
*/
public QName(String namespaceURI, String localPart, String prefix) {
if (namespaceURI == null) {
this.namespaceURI = "";
} else {
this.namespaceURI = namespaceURI;
}
if (localPart == null) {
throw new IllegalArgumentException(
"local part cannot be \"null\" when creating a QName");
}
this.localPart = localPart;
if (prefix == null) {
throw new IllegalArgumentException(
"prefix cannot be \"null\" when creating a QName");
}
this.prefix = prefix;
}
/**
* <p><code>QName</code> constructor specifying the local part.</p>
*
* <p>If the local part is <code>null</code> or
* <code>.equals("")</code>, an
* <code>IllegalArgumentException</code> is thrown.</p>
*
* <p>When using this constructor, the Namespace URI is set to ""
* and the prefix is set to "".</p>
*
* <p><em>In an XML context, all Element and Attribute names exist
* in the context of a Namespace. Making this explicit during the
* construction of a <code>QName</code> helps to prevent hard to
* diagnosis XML validity errors. The constructors {@link
* #QName(String namespaceURI, String localPart) QName(String
* namespaceURI, String localPart)} and {@link #QName(String
* namespaceURI, String localPart, String prefix) QName(String
* namespaceURI, String localPart, String prefix)} are
* preferred.</em></p>
*
* @param localPart local part of the <code>QName</code>
* @see #QName(String namespaceURI, String localPart) QName(String
* namespaceURI, String localPart)
* @see #QName(String namespaceURI, String localPart, String
* prefix) QName(String namespaceURI, String localPart, String
* prefix)
*/
public QName(String localPart) {
this("",
localPart,
"");
}
/**
* <p>Get the Namespace URI of this <code>QName</code>.</p>
*
* @return Namespace URI of this <code>QName</code>
*/
public String getNamespaceURI() {
return namespaceURI;
}
/**
* <p>Get the local part of this <code>QName</code>.</p>
*
* @return local part of this <code>QName</code>
*/
public String getLocalPart() {
return localPart;
}
/**
* <p>Get the prefix of this <code>QName</code>.</p>
*
* <p>The prefix assigned to a <code>QName</code> may
* <strong><em>NOT</em></strong> be valid in a different
* context. For example, a <code>QName</code> may be assigned a
* prefix in the context of parsing a document but that prefix may
* be invalid in the context of a different document.</p>
*
* @return prefix of this <code>QName</code>
*/
public String getPrefix() {
return prefix;
}
/**
* <p>Test this <code>QName</code> for equality with another
* <code>Object</code>.</p>
*
* <p>If the <code>Object</code> to be tested is not a
* <code>QName</code> or is <code>null</code>, then this method
* returns <code>false</code>.</p>
*
* <p>Two <code>QName</code>s are considered equal if and only if
* both the Namespace URI and local part are equal. This method
* uses <code>String.equals()</code> to check equality of the
* Namespace URI and local part. The prefix is
* <strong><em>NOT</em></strong> used to determine equality.</p>
*
* <p>This method satisfies the general contract of {@link
* java.lang.Object#equals(Object) Object.equals(Object)}</p>
*
* @param objectToTest the <code>Object</code> to test for
* equality with this <code>QName</code>
* @return <code>true</code> if the given <code>Object</code> is
* equal to this <code>QName</code> else <code>false</code>
*/
public boolean equals(Object objectToTest) {
if (objectToTest == null || !(objectToTest instanceof QName)) {
return false;
}
QName qName = (QName) objectToTest;
return namespaceURI.equals(qName.namespaceURI)
&& localPart.equals(qName.localPart);
}
/**
* <p>Generate the hash code for this <code>QName</code>.</p>
*
* <p>The hash code is calculated using both the Namespace URI and
* the local part of the <code>QName</code>. The prefix is
* <strong><em>NOT</em></strong> used to calculate the hash
* code.</p>
*
* <p>This method satisfies the general contract of {@link
* java.lang.Object#hashCode() Object.hashCode()}.</p>
*
* @return hash code for this <code>QName</code> <code>Object</code>
*/
public int hashCode() {
return namespaceURI.hashCode() ^ localPart.hashCode();
}
/**
* <p><code>String</code> representation of this
* <code>QName</code>.</p>
*
* <p><em>There is <strong>NO</strong> standard specification for
* representing a <code>QName</code> as a <code>String</code>.
* The returned <code>String</code> is not portable across
* implementations and will change when a standard
* <code>String</code> representation is defined. This
* implementation currently represents a <code>QName</code> as:
* "{" + Namespace URI + "}" + local part. If the Namespace URI
* <code>.equals("")</code>, only the
* local part is returned. An appropriate use of this method is
* for debugging or logging for human consumption.</em></p>
*
* <p>Note the prefix value is <strong><em>NOT</em></strong>
* returned as part of the <code>String</code> representation.</p>
*
* <p>This method satisfies the general contract of {@link
* java.lang.Object#toString() Object.toString()}.</p>
*
* @return <code>String</code> representation of this <code>QName</code>
*/
public String toString() {
if (namespaceURI.equals("")) {
return localPart;
} else {
return "{" + namespaceURI + "}" + localPart;
}
}
/**
* <p><code>QName</code> derived from parsing the formatted
* <code>String</code>.</p>
*
* <p>If the <code>String</code> is <code>null</code>
* or does not conform to {@link #toString() QName.toString()} formatting,
* an <code>IllegalArgumentException</code> is thrown.</p>
*
* <p><em>The <code>String</code> <strong>MUST</strong> be in the
* form returned by {@link #toString() QName.toString()}. There is
* <strong>NO</strong> standard specification for representing a
* <code>QName</code> as a <code>String</code>. The
* <code>String</code> format is <strong>NOT</strong> portable
* across implementations and will change when a standard
* <code>String</code> representation is defined. This
* implementation currently parses a <code>String</code> formatted
* as: "{" + Namespace URI + "}" + local part. If the Namespace
* URI <code>.equals("")</code>, only the
* local part should be provided.</em></p>
*
* <p>The prefix value <strong><em>CANNOT</em></strong> be
* represented in the <code>String</code> and will be set to
* ""</p>
*
* <p>This method does not do full validation of the resulting
* <code>QName</code>. In particular, the local part is not
* validated as a <a
* href="http://www.w3.org/TR/REC-xml-names/#NT-NCName">NCName</a>
* as specified in <a
* href="http://www.w3.org/TR/REC-xml-names/">Namespaces in
* XML</a>.</p>
*
* @param qNameAsString <code>String</code> representation
* of the <code>QName</code>
* @return <code>QName</code> corresponding to the given <code>String</code>
* @see #toString() QName.toString()
*/
public static QName valueOf(String qNameAsString) {
if (qNameAsString == null) {
throw new IllegalArgumentException(
"cannot create QName from \"null\"");
}
// added this in 1.1 so that valueOf() can read back any QName
// serialized using toString()
if (qNameAsString.length() == 0) {
return new QName("");
}
// local part only?
if (qNameAsString.charAt(0) != '{') {
return new QName("",
qNameAsString,
"");
}
// specifies Namespace URI and local part
int endOfNamespaceURI = qNameAsString.indexOf('}');
if (endOfNamespaceURI == -1) {
throw new IllegalArgumentException(
"cannot create QName from \""
+ qNameAsString + "\", missing closing \"}\"");
}
if (endOfNamespaceURI == qNameAsString.length() - 1) {
throw new IllegalArgumentException(
"cannot create QName from \""
+ qNameAsString + "\", missing local part");
}
return new QName(qNameAsString.substring(1, endOfNamespaceURI),
qNameAsString.substring(endOfNamespaceURI + 1),
"");
}
}
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