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package org.objectweb.celtix.tools.common.dom;

import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.xml.XMLConstants;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
    
import org.objectweb.celtix.common.logging.LogUtils;

/**
 * (not thread safe)
 * 
 */
public final class SchemaValidatingSAXParser {

    private static final Logger LOG = LogUtils.getL7dLogger(SchemaValidatingSAXParser.class);

    private final SAXParserFactory parserFactory = SAXParserFactory.newInstance();
    private SAXParser parser;
    private SchemaFactory schemaFactory;
    private Schema schema;

    public SchemaValidatingSAXParser() {
        try {
            parserFactory.setNamespaceAware(true);
            parser = parserFactory.newSAXParser();
        } catch (javax.xml.parsers.ParserConfigurationException e) {
            LOG.log(Level.SEVERE, "SAX_PARSER_CONFIG_ERR_MSG");
        } catch (org.xml.sax.SAXException saxe) {
            LOG.log(Level.SEVERE, "SAX_PARSER_EXCEPTION_MSG");
        }
        setValidating(true);
    }

    private InputStream getSchemaLocation() {
        String toolspec = "/org/objectweb/celtix/tools/common/toolspec/tool-specification.xsd";
        return getClass().getResourceAsStream(toolspec);
    }
    
    public void setValidating(boolean validate) {
        if (validate) {
            this.schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            try {
                this.schema = schemaFactory.newSchema(new StreamSource(getSchemaLocation()));
            } catch (org.xml.sax.SAXException e) {
                LOG.log(Level.SEVERE, "SCHEMA_FACTORY_EXCEPTION_MSG");
            }
            this.parserFactory.setSchema(this.schema);
        }
    }

    public SAXParser getSAXParser() {
        return parser;
    }
}