trunk/validator/src/main/java/org/odftoolkit/odfvalidator/MetaFilter.java

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 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * Copyright 2008, 2010 Oracle and/or its affiliates. All rights reserved.
 * 
 * Use is subject to license terms.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0. You can also
 * obtain a copy of the License at http://odftoolkit.org/docs/license.txt
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * 
 * See the License for the specific language governing permissions and
 * limitations under the License.
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package org.odftoolkit.odfvalidator;

import org.odftoolkit.odfdom.dom.OdfDocumentNamespace;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.XMLFilterImpl;

class MetaFilter extends XMLFilterImpl {

    private boolean m_bInGenerator = false;
    private String m_aGenerator = "";
    private boolean m_bRoot = true;
    
    private static final String META_NAMESPACE_URI = OdfDocumentNamespace.META.getUri();
    private static final String OFFICE_NAMESPACE_URI = OdfDocumentNamespace.OFFICE.getUri();
    private static final String GENERATOR = "generator";
    private static final String DOCUMENT_META = "document-meta";

    private Logger m_aLogger;
    private MetaInformationListener m_aMetaListener;
    
    
    /** Creates a new instance of MetaFilter */
    MetaFilter( Logger aLogger, MetaInformationListener aMetaListener ) {
        m_aLogger = aLogger;
        m_aMetaListener = aMetaListener;
    }
    
    @Override
    public void characters(char[] aChars, int nStart, int nLength) throws SAXException {
        super.characters(aChars, nStart, nLength);
        
        if( m_bInGenerator )
        {
            m_aGenerator += new String( aChars, nStart, nLength );
        }
    }

    @Override
    public void endElement(String aUri, String aLocalName, String aQName) throws SAXException {
        super.endElement(aUri, aLocalName, aQName);
        
        if( aUri.equals(META_NAMESPACE_URI) && aLocalName.equals(GENERATOR) )
        {
            m_aGenerator = m_aGenerator.trim();
            m_aLogger.logInfo( "Generator: " + m_aGenerator , false);
            m_bInGenerator = false;
            if( m_aMetaListener!=null ) {
                m_aMetaListener.setGenerator( m_aGenerator );
            }
        }
    }

    @Override
    public void startElement(String aUri, String aLocalName, String aQName, Attributes aAttributes) throws SAXException {
        super.startElement(aUri, aLocalName, aQName, aAttributes);

        if( m_bRoot )
        {
            if( !(aUri.equals(OFFICE_NAMESPACE_URI) && aLocalName.equals(DOCUMENT_META)) )
                m_aLogger.logError("Invalid root element: " + aQName );
            m_bRoot = false;
        }
                
        if( aUri.equals(META_NAMESPACE_URI) && aLocalName.equals(GENERATOR) )
            m_bInGenerator = true;
    }
}