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Diffstat (limited to 'libjava/org/xml/sax/helpers/XMLReaderFactory.java')
| -rw-r--r-- | libjava/org/xml/sax/helpers/XMLReaderFactory.java | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/libjava/org/xml/sax/helpers/XMLReaderFactory.java b/libjava/org/xml/sax/helpers/XMLReaderFactory.java deleted file mode 100644 index e1fa80c84cf..00000000000 --- a/libjava/org/xml/sax/helpers/XMLReaderFactory.java +++ /dev/null @@ -1,203 +0,0 @@ -// XMLReaderFactory.java - factory for creating a new reader. -// http://www.saxproject.org -// Written by David Megginson -// and by David Brownell -// NO WARRANTY! This class is in the Public Domain. - -// $Id: XMLReaderFactory.java,v 1.5.2.4 2002/01/29 21:34:15 dbrownell Exp $ - -package org.xml.sax.helpers; -import java.io.BufferedReader; -import java.io.InputStream; -import java.io.InputStreamReader; -import org.xml.sax.XMLReader; -import org.xml.sax.SAXException; - - -/** - * Factory for creating an XML reader. - * - * <blockquote> - * <em>This module, both source code and documentation, is in the - * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em> - * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a> - * for further information. - * </blockquote> - * - * <p>This class contains static methods for creating an XML reader - * from an explicit class name, or based on runtime defaults:</p> - * - * <pre> - * try { - * XMLReader myReader = XMLReaderFactory.createXMLReader(); - * } catch (SAXException e) { - * System.err.println(e.getMessage()); - * } - * </pre> - * - * <p><strong>Note to Distributions bundled with parsers:</strong> - * You should modify the implementation of the no-arguments - * <em>createXMLReader</em> to handle cases where the external - * configuration mechanisms aren't set up. That method should do its - * best to return a parser when one is in the class path, even when - * nothing bound its class name to <code>org.xml.sax.driver</code> so - * those configuration mechanisms would see it.</p> - * - * @since SAX 2.0 - * @author David Megginson, David Brownell - * @version 2.0.1 (sax2r2) - */ -final public class XMLReaderFactory -{ - /** - * Private constructor. - * - * <p>This constructor prevents the class from being instantiated.</p> - */ - private XMLReaderFactory () - { - } - - private static final String property = "org.xml.sax.driver"; - - /** - * Attempt to create an XMLReader from system defaults. - * In environments which can support it, the name of the XMLReader - * class is determined by trying each these options in order, and - * using the first one which succeeds:</p> <ul> - * - * <li>If the system property <code>org.xml.sax.driver</code> - * has a value, that is used as an XMLReader class name. </li> - * - * <li>The JAR "Services API" is used to look for a class name - * in the <em>META-INF/services/org.xml.sax.driver</em> file in - * jarfiles available to the runtime.</li> - * - * <li> SAX parser distributions are strongly encouraged to provide - * a default XMLReader class name that will take effect only when - * previous options (on this list) are not successful.</li> - * - * <li>Finally, if {@link ParserFactory#makeParser()} can - * return a system default SAX1 parser, that parser is wrapped in - * a {@link ParserAdapter}. (This is a migration aid for SAX1 - * environments, where the <code>org.xml.sax.parser</code> system - * property will often be usable.) </li> - * - * </ul> - * - * <p> In environments such as small embedded systems, which can not - * support that flexibility, other mechanisms to determine the default - * may be used. </p> - * - * <p>Note that many Java environments allow system properties to be - * initialized on a command line. This means that <em>in most cases</em> - * setting a good value for that property ensures that calls to this - * method will succeed, except when security policies intervene. - * This will also maximize application portability to older SAX - * environments, with less robust implementations of this method. - * </p> - * - * @return A new XMLReader. - * @exception org.xml.sax.SAXException If no default XMLReader class - * can be identified and instantiated. - * @see #createXMLReader(java.lang.String) - */ - public static XMLReader createXMLReader () - throws SAXException - { - String className = null; - ClassLoader loader = NewInstance.getClassLoader (); - - // 1. try the JVM-instance-wide system property - try { className = System.getProperty (property); } - catch (Exception e) { /* normally fails for applets */ } - - // 2. if that fails, try META-INF/services/ - if (className == null) { - try { - String service = "META-INF/services/" + property; - InputStream in; - BufferedReader reader; - - if (loader == null) - in = ClassLoader.getSystemResourceAsStream (service); - else - in = loader.getResourceAsStream (service); - - if (in != null) { - reader = new BufferedReader ( - new InputStreamReader (in, "UTF8")); - className = reader.readLine (); - in.close (); - } - } catch (Exception e) { - } - } - - // 3. Distro-specific fallback - if (className == null) { -// BEGIN DISTRIBUTION-SPECIFIC - - // EXAMPLE: - // className = "com.example.sax.XmlReader"; - // or a $JAVA_HOME/jre/lib/*properties setting... - -// END DISTRIBUTION-SPECIFIC - } - - // do we know the XMLReader implementation class yet? - if (className != null) - return loadClass (loader, className); - - // 4. panic -- adapt any SAX1 parser - try { - return new ParserAdapter (ParserFactory.makeParser ()); - } catch (Exception e) { - throw new SAXException ("Can't create default XMLReader; " - + "is system property org.xml.sax.driver set?"); - } - } - - - /** - * Attempt to create an XML reader from a class name. - * - * <p>Given a class name, this method attempts to load - * and instantiate the class as an XML reader.</p> - * - * <p>Note that this method will not be usable in environments where - * the caller (perhaps an applet) is not permitted to load classes - * dynamically.</p> - * - * @return A new XML reader. - * @exception org.xml.sax.SAXException If the class cannot be - * loaded, instantiated, and cast to XMLReader. - * @see #createXMLReader() - */ - public static XMLReader createXMLReader (String className) - throws SAXException - { - return loadClass (NewInstance.getClassLoader (), className); - } - - private static XMLReader loadClass (ClassLoader loader, String className) - throws SAXException - { - try { - return (XMLReader) NewInstance.newInstance (loader, className); - } catch (ClassNotFoundException e1) { - throw new SAXException("SAX2 driver class " + className + - " not found", e1); - } catch (IllegalAccessException e2) { - throw new SAXException("SAX2 driver class " + className + - " found but cannot be loaded", e2); - } catch (InstantiationException e3) { - throw new SAXException("SAX2 driver class " + className + - " loaded but cannot be instantiated (no empty public constructor?)", - e3); - } catch (ClassCastException e4) { - throw new SAXException("SAX2 driver class " + className + - " does not implement XMLReader", e4); - } - } -} |