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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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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;

/**

 * {@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.

     */

    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);

    }

}