| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| // $Id: QName.java 754581 2009-03-15 01:32:39Z mrglavas $ |
| |
| package javax.xml.namespace; |
| |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.Serializable; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import javax.xml.XMLConstants; |
| |
| /** |
| * <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 |
| * <strong><em>only</em></strong> the Namespace URI and local part.</p> |
| * |
| * <p>If not specified, the Namespace URI is set to {@link |
| * javax.xml.XMLConstants#NULL_NS_URI XMLConstants.NULL_NS_URI}. |
| * If not specified, the prefix is set to {@link |
| * javax.xml.XMLConstants#DEFAULT_NS_PREFIX |
| * XMLConstants.DEFAULT_NS_PREFIX}.</p> |
| * |
| * <p><code>QName</code> is immutable.</p> |
| * |
| * @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a> |
| * @version $Revision: 754581 $, $Date: 2009-03-14 18:32:39 -0700 (Sat, 14 Mar 2009) $ |
| * @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> |
| * @since 1.5 |
| */ |
| |
| public class QName implements Serializable { |
| |
| /** |
| * <p>Stream Unique Identifier.</p> |
| * |
| * <p>To enable the compatibility <code>serialVersionUID</code> |
| * set the System Property |
| * <code>org.apache.xml.namespace.QName.useCompatibleSerialVersionUID</code> |
| * to a value of "1.0".</p> |
| */ |
| private static final long serialVersionUID; |
| |
| /** |
| * <p>The original default Stream Unique Identifier.</p> |
| */ |
| private static final long defaultSerialVersionUID = -9120448754896609940L; |
| |
| /** |
| * <p>The compatibility Stream Unique Identifier that was introduced |
| * with Java 5 SE SDK.</p> |
| */ |
| private static final long compatabilitySerialVersionUID = 4418622981026545151L; |
| |
| static { |
| String compatPropValue = null; |
| try { |
| compatPropValue = (String)AccessController.doPrivileged( |
| new PrivilegedAction() { |
| public Object run() { |
| return System.getProperty("org.apache.xml.namespace.QName.useCompatibleSerialVersionUID"); |
| } |
| }); |
| } |
| catch (Exception e) {} |
| // If 1.0 use compatibility serialVersionUID |
| serialVersionUID = !"1.0".equals(compatPropValue) ? defaultSerialVersionUID : compatabilitySerialVersionUID; |
| } |
| |
| /** |
| * <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 String prefix; |
| |
| /** |
| * <p><code>String</code> representation of this <code>QName</code>.</p> |
| */ |
| private transient String qNameAsString; |
| |
| /** |
| * <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 |
| * {@link javax.xml.XMLConstants#NULL_NS_URI |
| * XMLConstants.NULL_NS_URI}. 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. Explicitly providing the {@link |
| * javax.xml.XMLConstants#NULL_NS_URI |
| * XMLConstants.NULL_NS_URI} value is the preferred coding |
| * style.</p> |
| * |
| * <p>If the local part is <code>null</code> an |
| * <code>IllegalArgumentException</code> is thrown. |
| * A local part of "" is allowed to preserve |
| * compatible behavior with QName 1.0. </p> |
| * |
| * <p>When using this constructor, the prefix is set to {@link |
| * javax.xml.XMLConstants#DEFAULT_NS_PREFIX |
| * XMLConstants.DEFAULT_NS_PREFIX}.</p> |
| * |
| * <p>The Namespace URI is not validated as a |
| * <a href="http://www.ietf.org/rfc/rfc2396.txt">URI reference</a>. |
| * 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 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(final String namespaceURI, final String localPart) { |
| this(namespaceURI, localPart, XMLConstants.DEFAULT_NS_PREFIX); |
| } |
| |
| /** |
| * <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 |
| * {@link javax.xml.XMLConstants#NULL_NS_URI |
| * XMLConstants.NULL_NS_URI}. 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. Explicitly providing the {@link |
| * javax.xml.XMLConstants#NULL_NS_URI |
| * XMLConstants.NULL_NS_URI} value is the preferred coding |
| * style.</p> |
| * |
| * <p>If the local part is <code>null</code> an |
| * <code>IllegalArgumentException</code> is thrown. |
| * A local part of "" is allowed to preserve |
| * compatible behavior with QName 1.0. </p> |
| * |
| * <p>If the prefix is <code>null</code>, an |
| * <code>IllegalArgumentException</code> is thrown. Use {@link |
| * javax.xml.XMLConstants#DEFAULT_NS_PREFIX |
| * XMLConstants.DEFAULT_NS_PREFIX} to explicitly indicate that no |
| * prefix is present or the prefix is not relevant.</p> |
| * |
| * <p>The Namespace URI is not validated as a |
| * <a href="http://www.ietf.org/rfc/rfc2396.txt">URI reference</a>. |
| * The local part and prefix are 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 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) { |
| |
| // map null Namespace URI to default to preserve compatibility with QName 1.0 |
| if (namespaceURI == null) { |
| this.namespaceURI = XMLConstants.NULL_NS_URI; |
| } else { |
| this.namespaceURI = namespaceURI; |
| } |
| |
| // local part is required. "" is allowed to preserve compatibility with QName 1.0 |
| if (localPart == null) { |
| throw new IllegalArgumentException("local part cannot be \"null\" when creating a QName"); |
| } |
| this.localPart = localPart; |
| |
| // prefix is required |
| 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> an |
| * <code>IllegalArgumentException</code> is thrown. |
| * A local part of "" is allowed to preserve |
| * compatible behavior with QName 1.0. </p> |
| * |
| * <p>When using this constructor, the Namespace URI is set to |
| * {@link javax.xml.XMLConstants#NULL_NS_URI |
| * XMLConstants.NULL_NS_URI} and the prefix is set to {@link |
| * javax.xml.XMLConstants#DEFAULT_NS_PREFIX |
| * XMLConstants.DEFAULT_NS_PREFIX}.</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 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)} |
| * are preferred.</em></p> |
| * |
| * <p>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 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( |
| XMLConstants.NULL_NS_URI, |
| localPart, |
| XMLConstants.DEFAULT_NS_PREFIX); |
| } |
| |
| /** |
| * <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> might |
| * <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 final boolean equals(Object objectToTest) { |
| // Is this the same object? |
| if (objectToTest == this) { |
| return true; |
| } |
| // Is this a QName? |
| if (objectToTest instanceof QName) { |
| QName qName = (QName) objectToTest; |
| return localPart.equals(qName.localPart) && namespaceURI.equals(qName.namespaceURI); |
| } |
| return false; |
| } |
| |
| /** |
| * <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 final int hashCode() { |
| return namespaceURI.hashCode() ^ localPart.hashCode(); |
| } |
| |
| /** |
| * <p><code>String</code> representation of this |
| * <code>QName</code>.</p> |
| * |
| * <p>The commonly accepted way of representing a <code>QName</code> |
| * as a <code>String</code> was <a href="http://jclark.com/xml/xmlns.htm">defined</a> |
| * by James Clark. Although this is not a <em>standard</em> |
| * specification, it is in common use, e.g. {@link javax.xml.transform.Transformer#setParameter(String name, Object value)}. |
| * This implementation represents a <code>QName</code> as: |
| * "{" + Namespace URI + "}" + local part. If the Namespace URI |
| * <code>.equals(XMLConstants.NULL_NS_URI)</code>, only the |
| * local part is returned. An appropriate use of this method is |
| * for debugging or logging for human consumption.</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() { |
| String _qNameAsString = qNameAsString; |
| if (_qNameAsString == null) { |
| final int nsLength = namespaceURI.length(); |
| if (nsLength == 0) { |
| _qNameAsString = localPart; |
| } |
| else { |
| StringBuilder buffer = new StringBuilder(nsLength + localPart.length() + 2); |
| buffer.append('{'); |
| buffer.append(namespaceURI); |
| buffer.append('}'); |
| buffer.append(localPart); |
| _qNameAsString = buffer.toString(); |
| } |
| qNameAsString = _qNameAsString; |
| } |
| return _qNameAsString; |
| } |
| |
| /** |
| * <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()}.</em></p> |
| * |
| * <p>The commonly accepted way of representing a <code>QName</code> |
| * as a <code>String</code> was <a href="http://jclark.com/xml/xmlns.htm">defined</a> |
| * by James Clark. Although this is not a <em>standard</em> |
| * specification, it is in common use, e.g. {@link javax.xml.transform.Transformer#setParameter(String name, Object value)}. |
| * This implementation parses a <code>String</code> formatted |
| * as: "{" + Namespace URI + "}" + local part. If the Namespace |
| * URI <code>.equals(XMLConstants.NULL_NS_URI)</code>, only the |
| * local part should be provided.</p> |
| * |
| * <p>The prefix value <strong><em>CANNOT</em></strong> be |
| * represented in the <code>String</code> and will be set to |
| * {@link javax.xml.XMLConstants#DEFAULT_NS_PREFIX |
| * XMLConstants.DEFAULT_NS_PREFIX}.</p> |
| * |
| * <p>This method does not do full validation of the resulting |
| * <code>QName</code>. |
| * <p>The Namespace URI is not validated as a |
| * <a href="http://www.ietf.org/rfc/rfc2396.txt">URI reference</a>. |
| * 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) { |
| |
| // null is not valid |
| if (qNameAsString == null) { |
| throw new IllegalArgumentException("cannot create QName from \"null\" or \"\" String"); |
| } |
| |
| // "" local part is valid to preserve compatible behavior with QName 1.0 |
| if (qNameAsString.length() == 0) { |
| return new QName( |
| XMLConstants.NULL_NS_URI, |
| qNameAsString, |
| XMLConstants.DEFAULT_NS_PREFIX); |
| } |
| |
| // local part only? |
| if (qNameAsString.charAt(0) != '{') { |
| return new QName( |
| XMLConstants.NULL_NS_URI, |
| qNameAsString, |
| XMLConstants.DEFAULT_NS_PREFIX); |
| } |
| |
| // Namespace URI improperly specified? |
| if (qNameAsString.startsWith("{" + XMLConstants.NULL_NS_URI + "}")) { |
| throw new IllegalArgumentException( |
| "Namespace URI .equals(XMLConstants.NULL_NS_URI), " |
| + ".equals(\"" + XMLConstants.NULL_NS_URI + "\"), " |
| + "only the local part, " |
| + "\"" + qNameAsString.substring(2 + XMLConstants.NULL_NS_URI.length()) + "\", " |
| + "should be provided."); |
| } |
| |
| // Namespace URI and local part specified |
| int endOfNamespaceURI = qNameAsString.indexOf('}'); |
| if (endOfNamespaceURI == -1) { |
| throw new IllegalArgumentException( |
| "cannot create QName from \"" |
| + qNameAsString |
| + "\", missing closing \"}\""); |
| } |
| return new QName( |
| qNameAsString.substring(1, endOfNamespaceURI), |
| qNameAsString.substring(endOfNamespaceURI + 1), |
| XMLConstants.DEFAULT_NS_PREFIX); |
| } |
| |
| /* |
| * For old versions of QName which didn't have a prefix field, |
| * <code>ObjectInputStream.defaultReadObject()</code> will initialize |
| * the prefix to <code>null</code> instead of the empty string. This |
| * method fixes up the prefix field if it didn't exist in the serialized |
| * object. |
| */ |
| private void readObject(ObjectInputStream in) |
| throws IOException, ClassNotFoundException { |
| in.defaultReadObject(); |
| if (prefix == null) { |
| prefix = XMLConstants.DEFAULT_NS_PREFIX; |
| } |
| } |
| } |
