tapfileparser.java

一个完整的XACML工程,学习XACML技术的好例子!

/*
* Copyright (c) 2006, University of Kent
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without 
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this 
* list of conditions and the following disclaimer.
* 
* 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. 
*
* 1. Neither the name of the University of Kent nor the names of its 
* contributors may be used to endorse or promote products derived from this 
* software without specific prior written permission. 
*
* 2. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS  
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
* PURPOSE ARE DISCLAIMED. 
*
* 3. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
* CONSEQUENTIAL DAMAGES (INCLUDING, 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.
*
* 4. YOU AGREE THAT THE EXCLUSIONS IN PARAGRAPHS 2 AND 3 ABOVE ARE REASONABLE
* IN THE CIRCUMSTANCES.  IN PARTICULAR, YOU ACKNOWLEDGE (1) THAT THIS
* SOFTWARE HAS BEEN MADE AVAILABLE TO YOU FREE OF CHARGE, (2) THAT THIS
* SOFTWARE IS NOT "PRODUCT" QUALITY, BUT HAS BEEN PRODUCED BY A RESEARCH
* GROUP WHO DESIRE TO MAKE THIS SOFTWARE FREELY AVAILABLE TO PEOPLE WHO WISH
* TO USE IT, AND (3) THAT BECAUSE THIS SOFTWARE IS NOT OF "PRODUCT" QUALITY
* IT IS INEVITABLE THAT THERE WILL BE BUGS AND ERRORS, AND POSSIBLY MORE
* SERIOUS FAULTS, IN THIS SOFTWARE.
*
* 5. This license is governed, except to the extent that local laws
* necessarily apply, by the laws of England and Wales.
*/

/*
 * TAPFileParser.java - 25/07/2006
 */

package issrg.editor2.configurations;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;

/**
 * Verifies if the inputted TAP file is a valid one.
 *
 * @author Christian Azzopardi
 */
public class TAPFileParser 
{
    public Document document;
    private InputStream TAPFileDOM;
    private String TAPpath, schemaPath;
    public String parsingError = "";
    
    /** Creates a new instance of TAPFileParser */
    public TAPFileParser(String TAPpath, String schemaPath) 
    {
        this.TAPpath = TAPpath;
        this.schemaPath = schemaPath;
        File TAPFile = new File(TAPpath);
        
        try
        {
            TAPFileDOM = new FileInputStream(TAPFile);
        }
        catch(FileNotFoundException fnfe)
        {
            //System.out.println("TAP File Not Found!");
            return;
        }
        
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try 
        {
            DocumentBuilder builder = factory.newDocumentBuilder();
            this.document = builder.parse(TAPFileDOM);            
        }
        catch (SAXException sxe) { }
        catch (ParserConfigurationException pce) { }
        catch (IOException ioe) { }
        catch (SecurityException se) { }
    }
    
    public boolean validateDocument() 
    {   
        if(this.document == null)
        {
            return false;
        }
        
        SAXParserFactory factory = SAXParserFactory.newInstance();
        //factory.setValidating(true);
        factory.setNamespaceAware(false);
        
        try
        {
            XMLReader parser = factory.newSAXParser().getXMLReader();
            TAPFileParserErrorHandler tfpeh = new TAPFileParserErrorHandler();
            parser.setErrorHandler(tfpeh);
            parser.setFeature("http://apache.org/xml/features/validation/schema", true);
            parser.setFeature("http://xml.org/sax/features/validation", true);
            parser.setProperty("http://apache.org/xml/properties/schema/external-noNamespaceSchemaLocation", 
                    this.schemaPath);
            InputSource is = new InputSource(this.TAPpath);
            parser.parse(is);
        }
        catch(SAXParseException saxpe)
        {
            parsingError = saxpe.getMessage();
            return false;
        }
        catch(SAXException saxe)
        {
            parsingError = saxe.getMessage();
            return false;
        }
        catch(ParserConfigurationException pce)
        {
            parsingError = pce.getMessage();
            return false;
        }
        catch(IOException ioe)
        {
            parsingError = ioe.getMessage();
            return false;
        }
        return true;
    }
    
    public String getErrorMessage()
    {
        return parsingError;
    }
    
}