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/*
* 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.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 Configuration.
*/
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();
if (parser == null) {
MessageHandler.errorln("ERROR: Unable to create SAX parser");
System.exit(1);
}
// setting the parser features
try {
parser.setFeature("http://xml.org/sax/features/namespace-prefixes",
false);
} catch (SAXException e) {
MessageHandler.errorln("You need a parser which supports SAX version 2");
if (errorDump) {
e.printStackTrace();
}
System.exit(1);
}
ConfigurationParser configurationParser = new ConfigurationParser();
parser.setContentHandler(configurationParser);
try {
parser.parse(filename);
// Configuration.setup(Configuration.STANDARD, configurationParser.getConfiguration(Configuration.STANDARD));
// Configuration.setup(Configuration.PDF, configurationParser.getConfiguration(Configuration.PDF));
// Configuration.setup(Configuration.AWT, configurationParser.getConfiguration(Configuration.AWT));
} catch (SAXException e) {
if (e.getException() instanceof FOPException) {
dumpError(e.getException());
throw (FOPException) e.getException();
} else {
dumpError(e);
throw new FOPException(e.getMessage());
}
}
catch (IOException e) {
dumpError(e);
throw new FOPException(e.getMessage());
}
}
/**
* creates a SAX parser, using the value of org.xml.sax.parser
* defaulting to org.apache.xerces.parsers.SAXParser
*
* @return the created SAX parser
*/
static XMLReader createParser() {
String parserClassName = System.getProperty("org.xml.sax.parser");
if (parserClassName == null) {
parserClassName = "org.apache.xerces.parsers.SAXParser";
}
if (errorDump) {
MessageHandler.logln( "configuration reader using SAX parser " +
parserClassName);
}
try {
return (XMLReader) Class.forName(
parserClassName).newInstance();
} catch (ClassNotFoundException e) {
MessageHandler.errorln("Could not find " + parserClassName);
if (errorDump) {
e.printStackTrace();
}
}
catch (InstantiationException e) {
MessageHandler.errorln("Could not instantiate " +
parserClassName);
if (errorDump) {
e.printStackTrace();
}
}
catch (IllegalAccessException e) {
MessageHandler.errorln("Could not access " + parserClassName);
if (errorDump) {
e.printStackTrace();
}
}
catch (ClassCastException e) {
MessageHandler.errorln(parserClassName + " is not a SAX driver");
if (errorDump) {
e.printStackTrace();
}
}
return null;
}
/**
* 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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