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/*
* $Id$
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The end-user documentation included with the redistribution, if any, must
* include the following acknowledgment: "This product includes software
* developed by the Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself, if
* and wherever such third-party acknowledgments normally appear.
*
* 4. The names "FOP" and "Apache Software Foundation" must not be used to
* endorse or promote products derived from this software without prior
* written permission. For written permission, please contact
* apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache", nor may
* "Apache" appear in their name, without prior written permission of the
* Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
* DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* ============================================================================
*
* This software consists of voluntary contributions made by many individuals
* on behalf of the Apache Software Foundation and was originally created by
* James Tauber <jtauber@jtauber.com>. For more information on the Apache
* Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.fop.apps;
// SAX
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
// Java
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.net.URL;
import java.io.File;
/**
* Abstract super class for input handlers.
* Should be used to abstract the various possibilities on how input
* can be provided to FOP (but actually isn't).
*/
public abstract class InputHandler {
/**
* Get the input source associated with this input handler.
* @return the input source
*/
public abstract InputSource getInputSource();
/**
* Get the SAX parser associated with this input handler.
* @return the SAX parser
* @throws FOPException in case of an error determining the SAX parser
*/
public abstract XMLReader getParser() throws FOPException;
/**
* Creates an InputSource from a URL.
* @param url URL to use
* @return the newly created InputSource
*/
public static InputSource urlInputSource(URL url) {
return new InputSource(url.toString());
}
/**
* Creates an <code>InputSource</code> from a <code>File</code>
* @param file the <code>File</code>
* @return the <code>InputSource</code> created
*/
public static InputSource fileInputSource(File file) {
/* this code adapted from James Clark's in XT */
String path = file.getAbsolutePath();
String fSep = System.getProperty("file.separator");
if (fSep != null && fSep.length() == 1) {
path = path.replace(fSep.charAt(0), '/');
}
if (path.length() > 0 && path.charAt(0) != '/') {
path = '/' + path;
}
try {
return new InputSource(new URL("file", null, path).toString());
} catch (java.net.MalformedURLException e) {
throw new Error("unexpected MalformedURLException");
}
}
/**
* Creates <code>XMLReader</code> object using default
* <code>SAXParserFactory</code>
* @return the created <code>XMLReader</code>
* @throws FOPException if the parser couldn't be created or configured for proper operation.
*/
protected static XMLReader createParser() throws FOPException {
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
return factory.newSAXParser().getXMLReader();
} catch (SAXException se) {
throw new FOPException("Coudn't create XMLReader", se);
} catch (ParserConfigurationException pce) {
throw new FOPException("Coudn't create XMLReader", pce);
}
}
/**
* Runs this InputHandler through the Driver.
* @param driver Driver instance to use
* @throws FOPException if processing this InputHandler fails
*/
public abstract void run(Driver driver) throws FOPException;
}
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