XML utility methods that only depend on the JDK
/*
* StandardUtilities.java - Miscelaneous XML utility functions.
* :tabSize=8:indentSize=8:noTabs=false:
* :folding=explicit:collapseFolds=1:
*
* Copyright (C) 1999, 2006 Marcelo Vanzin, Slava Pestov
* Portions copyright (C) 2000 Richard S. Hall
* Portions copyright (C) 2001 Dirk Moebius
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//{{{ Imports
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
//}}}
/**
* XML utility methods that only depend on the JDK.
*
* @author Marcelo Vanzin
* @version $Id: XMLUtilities.java 13929 2008-10-25 14:23:41Z k_satoda $
* @since 4.3pre6
*/
public class XMLUtilities
{
//{{{ charsToEntities() method
/**
* Converts <, >, & in the string to their HTML entity
* equivalents.
*
* <p>If <code>xml11</code> is true, then character entities
* are used to convert illegal XML characters (mainly ASCII
* control characters).</p>
*
* @param str The string
* @param xml11 Whether to allow XML 1.1 constructs.
*/
public static String charsToEntities(String str, boolean xml11)
{
StringBuilder buf = new StringBuilder(str.length());
for(int i = 0; i < str.length(); i++)
{
char ch = str.charAt(i);
// control characters, excluding \t, \r and \n
// See: http://www.w3.org/International/questions/qa-controls
if (((0x00 <= ch && ch <= 0x1F) || (0x7F <= ch && ch <= 0x9F))
&& ch != '\r' && ch != '\n' && ch != '\t')
{
if (xml11 && ch != 0x00)
{
buf.append("&#").append((int)ch).append(';');
}
else
{
// The character is illegal.
// But put a PI instead, to make it
// recoverable in certain apps.
buf.append("<?illegal-xml-character ")
.append((int)ch)
.append("?>");
}
continue;
}
switch(ch)
{
case '<':
buf.append("<");
break;
case '>':
buf.append(">");
break;
case '&':
buf.append("&");
break;
default:
buf.append(ch);
break;
}
}
return buf.toString();
} //}}}
//{{{ parseXML() method
/**
* Convenience method for parsing an XML file. This method will
* wrap the resource in an InputSource and set the source's
* systemId to "jedit.jar" (so the source should be able to
* handle any external entities by itself).
*
* <p>SAX Errors are caught and are not propagated to the caller;
* instead, an error message is printed to jEdit's activity
* log. So, if you need custom error handling, <b>do not use
* this method</b>.
*
* <p>The given stream is closed before the method returns,
* regardless whether there were errors or not.</p>
*
* @return true if any error occured during parsing, false if success.
*/
public static boolean parseXML(InputStream in, DefaultHandler handler)
throws IOException
{
try
{
XMLReader parser = XMLReaderFactory.createXMLReader();
InputSource isrc = new InputSource(
new BufferedInputStream(in));
isrc.setSystemId("jedit.jar");
parser.setContentHandler(handler);
parser.setDTDHandler(handler);
parser.setEntityResolver(handler);
parser.setErrorHandler(handler);
parser.parse(isrc);
}
catch(SAXParseException se)
{
int line = se.getLineNumber();
return true;
}
catch(SAXException e)
{
return true;
}
finally
{
try
{
if(in != null)
in.close();
}
catch(IOException io)
{
}
}
return false;
} //}}}
//{{{ resolveEntity() method
/**
* Tries to find the given systemId in the context of the given
* class. If the given systemId ends with the given test string,
* then try to load a resource using the Class's
* <code>getResourceAsStream()</code> method using the test string
* as the resource.
*
* <p>This is used a lot internally while parsing XML files used
* by jEdit, but anyone is free to use the method if it sounds
* usable.</p>
*/
public static InputSource findEntity(String systemId, String test, Class where)
{
if (systemId != null && systemId.endsWith(test))
{
try
{
return new InputSource(new BufferedInputStream(
where.getResourceAsStream(test)));
}
catch (Exception e)
{
}
}
return null;
} //}}}
private XMLUtilities() { }
}
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