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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.configuration;
// sax
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
import java.io.IOException;
import org.xml.sax.InputSource;
// fop
import org.apache.fop.apps.Driver;
import org.apache.fop.messaging.MessageHandler;
import org.apache.fop.apps.FOPException;
import org.apache.fop.configuration.Configuration;
/**
* entry class for reading configuration from file and creating a configuration
* class. typical use looks like that: <br>
*
* <code>ConfigurationReader reader = new ConfigurationReader ("config.xml","standard");
* try {
* reader.start();
* } catch (org.apache.fop.apps.FOPException error) {
* reader.dumpError(error);
* }
* </code>
* Once the configuration has been setup, the information can be accessed with
* the methods of StandardConfiguration.
*/
public class ConfigurationReader {
/**
* show a full dump on error
*/
private static boolean errorDump = false;
/**
* inputsource for configuration file
*/
private InputSource filename;
/**
* creates a configuration reader
* @param filename the file which contains the configuration information
*/
public ConfigurationReader(InputSource filename) {
this.filename = filename;
}
/**
* intantiates parser and starts parsing of config file
*/
public void start() throws FOPException {
XMLReader parser = createParser();
// setting the parser features
try {
parser.setFeature("http://xml.org/sax/features/namespace-prefixes",
false);
} catch (SAXException e) {
throw new FOPException("You need a parser which supports SAX version 2",
e);
}
ConfigurationParser configurationParser = new ConfigurationParser();
parser.setContentHandler(configurationParser);
try {
parser.parse(filename);
} catch (SAXException e) {
if (e.getException() instanceof FOPException) {
throw (FOPException)e.getException();
} else {
throw new FOPException(e);
}
} catch (IOException e) {
throw new FOPException(e);
}
}
/**
* creates a SAX parser, using the value of org.xml.sax.parser
* defaulting to org.apache.xerces.parsers.SAXParser
*
* @return the created SAX parser
*/
public static XMLReader createParser() throws FOPException {
String parserClassName = Driver.getParserClassName();
if (errorDump) {
MessageHandler.logln("configuration reader using SAX parser "
+ parserClassName);
}
try {
return (XMLReader)Class.forName(parserClassName).newInstance();
} catch (ClassNotFoundException e) {
throw new FOPException("Could not find " + parserClassName, e);
} catch (InstantiationException e) {
throw new FOPException("Could not instantiate "
+ parserClassName, e);
} catch (IllegalAccessException e) {
throw new FOPException("Could not access " + parserClassName, e);
} catch (ClassCastException e) {
throw new FOPException(parserClassName + " is not a SAX driver",
e);
}
}
/**
* Dumps an error
*/
public void dumpError(Exception e) {
if (errorDump) {
if (e instanceof SAXException) {
e.printStackTrace();
if (((SAXException)e).getException() != null) {
((SAXException)e).getException().printStackTrace();
}
} else {
e.printStackTrace();
}
}
}
/**
* long or short error messages
*
*/
public void setDumpError(boolean dumpError) {
errorDump = dumpError;
}
}
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