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package com.sun.tools.internal.xjc.reader.dtd.bindinfo;

import com.sun.tools.internal.xjc.Options;
import com.sun.tools.internal.xjc.reader.AbstractExtensionBindingChecker;
import com.sun.tools.internal.xjc.reader.Const;

import org.xml.sax.Attributes;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.XMLFilter;

XMLFilter that checks the use of extension namespace URIs (to see if they have corresponding plugins), and otherwise report an error. 

This code also masks the recognized extensions from the validator that
will be plugged as the next component to this.
Author:
Kohsuke Kawaguchi/**
 * {@link XMLFilter} that checks the use of extension namespace URIs
 * (to see if they have corresponding plugins), and otherwise report an error.
 *
 * <p>
 * This code also masks the recognized extensions from the validator that
 * will be plugged as the next component to this.
 *
 * @author Kohsuke Kawaguchi
 */
final class DTDExtensionBindingChecker extends AbstractExtensionBindingChecker {
    public DTDExtensionBindingChecker(String schemaLanguage, Options options, ErrorHandler handler) {
        super(schemaLanguage, options, handler);
    }

    
Returns true if the elements with the given namespace URI
should be blocked by this filter.
/**
     * Returns true if the elements with the given namespace URI
     * should be blocked by this filter.
     */
    private boolean needsToBePruned( String uri ) {
        if( uri.equals(schemaLanguage) )
            return false;
        if( uri.equals(Const.JAXB_NSURI) )
            return false;
        if( uri.equals(Const.XJC_EXTENSION_URI) )
            return false;
        // we don't want validator to see extensions that we understand ,
        // because they will complain.
        // OTOH, if  this is an extension that we didn't understand,
        // we want the validator to report an error
        return enabledExtensions.contains(uri);
    }



    public void startElement(String uri, String localName, String qName, Attributes atts)
        throws SAXException {

        if( !isCutting() ) {
            if(!uri.equals("")) {
                // "" is the standard namespace
                checkAndEnable(uri);

                verifyTagName(uri, localName, qName);

                if(needsToBePruned(uri))
                    startCutting();
            }
        }

        super.startElement(uri, localName, qName, atts);
    }
}