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Tom Tromey
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284
libjava/classpath/javax/xml/transform/TransformerFactory.java
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284
libjava/classpath/javax/xml/transform/TransformerFactory.java
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/* TransformerFactory.java --
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Copyright (C) 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.xml.transform;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.IOException;
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import java.util.Properties;
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/**
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* Factory for obtaining transformation contexts.
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*
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* @author (a href='mailto:dog@gnu.org'>Chris Burdess</a)
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*/
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public abstract class TransformerFactory
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{
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protected TransformerFactory()
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{
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}
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/**
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* Creates a new factory instance.
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* The implementation class to load is the first found in the following
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* locations:
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* <ol>
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* <li>the <code>javax.xml.transform.TransformerFactory</code> system
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* property</li>
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* <li>the above named property value in the
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* <code><i>$JAVA_HOME</i>/lib/jaxp.properties</code> file</li>
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* <li>the class name specified in the
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* <code>META-INF/services/javax.xml.parsers.DocumentBuilderFactory</code>
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* system resource</li>
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* <li>the default factory class</li>
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* </ol>
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*/
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public static TransformerFactory newInstance()
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throws TransformerFactoryConfigurationError
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{
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ClassLoader loader = Thread.currentThread().getContextClassLoader();
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if (loader == null)
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{
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loader = TransformerFactory.class.getClassLoader();
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}
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String className = null;
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int count = 0;
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do
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{
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className = getFactoryClassName(loader, count++);
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if (className != null)
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{
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try
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{
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Class t = (loader != null) ? loader.loadClass(className) :
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Class.forName(className);
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return (TransformerFactory) t.newInstance();
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}
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catch (ClassNotFoundException e)
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{
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className = null;
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}
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catch (Exception e)
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{
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throw new TransformerFactoryConfigurationError(e,
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"error instantiating class " + className);
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}
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}
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}
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while (className == null && count < 3);
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try
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{
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Class t =
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Class.forName("gnu.xml.transform.TransformerFactoryImpl");
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return (TransformerFactory) t.newInstance();
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}
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catch (Exception e)
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{
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throw new TransformerFactoryConfigurationError(e);
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}
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}
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private static String getFactoryClassName(ClassLoader loader, int attempt)
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{
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final String propertyName = "javax.xml.transform.TransformerFactory";
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switch (attempt)
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{
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case 0:
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return System.getProperty(propertyName);
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case 1:
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try
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{
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File file = new File(System.getProperty("java.home"));
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file = new File(file, "lib");
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file = new File(file, "jaxp.properties");
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InputStream in = new FileInputStream(file);
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Properties props = new Properties();
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props.load(in);
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in.close();
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return props.getProperty(propertyName);
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}
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catch (IOException e)
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{
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return null;
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}
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case 2:
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try
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{
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String serviceKey = "/META-INF/services/" + propertyName;
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InputStream in = (loader != null) ?
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loader.getResourceAsStream(serviceKey) :
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TransformerFactory.class.getResourceAsStream(serviceKey);
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if (in != null)
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{
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BufferedReader r =
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new BufferedReader(new InputStreamReader(in));
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String ret = r.readLine();
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r.close();
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return ret;
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}
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}
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catch (IOException e)
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{
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}
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return null;
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default:
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return null;
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}
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}
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/**
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* Creates a new transformer using the specified stylesheet.
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* @param source the source of an <a href='http://www.w3.org/TR/xslt'>XSLT
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* stylesheet</a> specifying the transformation to apply
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*/
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public abstract Transformer newTransformer(Source source)
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throws TransformerConfigurationException;
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/**
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* Creates a new transformer that applies the identity transform.
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*/
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public abstract Transformer newTransformer()
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throws TransformerConfigurationException;
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/**
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* Creates a new compiled transformation using the specified stylesheet.
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* @param source the source of an <a href='http://www.w3.org/TR/xslt'>XSLT
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* stylesheet</a> specifying the transformation to apply
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*/
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public abstract Templates newTemplates(Source source)
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throws TransformerConfigurationException;
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/**
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* Returns a source object representing the XML resource specified by the
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* <a href='http://www.w3.org/TR/xml-stylesheet/'>xml-stylesheet</a>
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* processing instruction and matching the given criteria.
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* Note that if multiple stylesheets are selected, the source represents a
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* stylesheet composed of a list of imports.
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* @param source the source XML document
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* @param media the media attribute to match, or <code>null</code> to match
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* the preferred templates
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* @param title the title attribute to match, or <code>null</code> to match
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* any
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* @param charset the charset attribute to match, or <code>null</code> to
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* match any
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*/
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public abstract Source getAssociatedStylesheet(Source source,
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String media,
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String title,
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String charset)
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throws TransformerConfigurationException;
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/**
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* Set the resolver callback to be used by transformers obtained from
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* this factory.
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*/
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public abstract void setURIResolver(URIResolver resolver);
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/**
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* Returns the resolver callback to be used by transformers obtained from
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* this factory.
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*/
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public abstract URIResolver getURIResolver();
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/**
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* Sets a feature of transformers and templates obtained from this
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* factory.
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* Feature names are fully qualified URIs, and may depend on the factory
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* implementation.
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* @param name the name of the feature
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* @param value the feature state
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* @exception TransformerConfigurationException if the feature is
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* unsupported
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*/
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public abstract void setFeature(String name, boolean value)
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throws TransformerConfigurationException;
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/**
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* Returns the state of a feature in the factory implementation.
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* Feature names are fully qualified URIs, and may depend on the factory
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* implementation. JAXP also predefines several features, including the
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* constants in {@link javax.xml.XMLConstants} and
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* <ul>
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* <li>{@link javax.xml.transform.dom.DOMSource#FEATURE}</li>
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* <li>{@link javax.xml.transform.dom.DOMResult#FEATURE}</li>
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* <li>{@link javax.xml.transform.sax.SAXSource#FEATURE}</li>
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* <li>{@link javax.xml.transform.sax.SAXResult#FEATURE}</li>
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* <li>{@link javax.xml.transform.sax.SAXTransformerFactory#FEATURE}</li>
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* <li>{@link javax.xml.transform.sax.SAXTransformerFactory#FEATURE_XMLFILTER}</li>
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* <li>{@link javax.xml.transform.stream.StreamSource#FEATURE}</li>
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* <li>{@link javax.xml.transform.stream.StreamResult#FEATURE}</li>
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* </ul>
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* The latter expose various capabilities of the factory implementation.
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*/
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public abstract boolean getFeature(String name);
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/**
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* Set a named attribute on the underlying implementation.
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* @param name the attribute name
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* @param value the value to assign
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* @exception IllegalArgumentException if the attribute is not supported
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*/
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public abstract void setAttribute(String name, Object value)
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throws IllegalArgumentException;
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/**
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* Retrieve the specified named attribute value.
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* @param name the attribute name
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* @exception IllegalArgumentException if the attribute is not supported
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*/
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public abstract Object getAttribute(String name)
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throws IllegalArgumentException;
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/**
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* Sets the callback to be used by transformers obtained from this factory
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* to report transformation errors.
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*/
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public abstract void setErrorListener(ErrorListener listener)
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throws IllegalArgumentException;
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/**
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* Returns the callback to be used by transformers obtained from this
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* factory to report transformation errors.
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*/
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public abstract ErrorListener getErrorListener();
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}
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