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 * Copyright 2008, 2010 Oracle and/or its affiliates. All rights reserved.
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 * 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
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 * 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.
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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.AttributesImpl;

class ContentFilter extends NamespaceFilter {

    private static final String CD2_SVG_NAMESPACE_URI = "http://www.w3.org/2000/svg";
    private static final String CD2_XSL_NAMESPACE_URI = "http://www.w3.org/1999/XSL/Format";
    private static final String CD2_SMIL_NAMESPACE_URI = "http://www.w3.org/2001/SMIL20/";
    private static final String BASE_OFFICE_NAMESPACE_URI = "http://openoffice.org/2004/office";
    private static final String BASE_DB_NAMESPACE_URI = "http://openoffice.org/2004/database";
    private static final String SVG_NAMESPACE_URI = OdfDocumentNamespace.SVG.getUri();
    private static final String XSL_NAMESPACE_URI = OdfDocumentNamespace.FO.getUri();
    private static final String SMIL_NAMESPACE_URI = OdfDocumentNamespace.SMIL.getUri();
    private static final String DRAW_NAMESPACE_URI = OdfDocumentNamespace.DRAW.getUri();
    private static final String OFFICE_NAMESPACE_URI = OdfDocumentNamespace.OFFICE.getUri();
    private static final String DB_NAMESPACE_URI = OdfDocumentNamespace.DB.getUri();
    private static final String BASE_OFFICE_NAMESPACE_PREFIX = "office";
    private static final String POLYGON = "polygon";
    private static final String CONTOUR_POLYGON = "contour-polygon";
    private static final String POLYLINE = "polyline";
    private static final String POINTS = "points";
    private static final int MAX_POINTS_LEN = 2048;
        
    private Logger m_aLogger;
    private String m_aLocalElementName;
    private boolean m_bRoot = true;
    
    /** Creates a new instance of KnownIssueFilter */
    ContentFilter( Logger aLogger, String aLocalElementName ) {
        m_aLogger = aLogger;
        m_aLocalElementName = aLocalElementName;
    }

    String adaptNamespaceUri( String aUri, String aPrefix)
    {
        String aNewUri = null;
        if( aUri.equals(CD2_SVG_NAMESPACE_URI) )
            aNewUri = SVG_NAMESPACE_URI;
        else if( aUri.equals(CD2_XSL_NAMESPACE_URI) )
             aNewUri = XSL_NAMESPACE_URI;
        else if( aUri.equals(CD2_SMIL_NAMESPACE_URI) ) 
            aNewUri = SMIL_NAMESPACE_URI;
        else if( aUri.equals(BASE_OFFICE_NAMESPACE_URI) &&
                 (aPrefix == null || aPrefix.startsWith(BASE_OFFICE_NAMESPACE_PREFIX)) )
            aNewUri = OFFICE_NAMESPACE_URI;
        else if( aUri.equals(BASE_DB_NAMESPACE_URI) )
            aNewUri = DB_NAMESPACE_URI;
        
        return aNewUri;
    }

    void namespaceUriAdapted( String aUri, String aNewUri )
    {
        String aMsg = (aUri.equals(BASE_OFFICE_NAMESPACE_URI) || aUri.equals(BASE_DB_NAMESPACE_URI))
                ? "Adapting Base namspace'" + aUri + "'"
                : "Adapting OpenDocument CD2 namspace'" + aUri + "' (has been stored by old OOo versions)";
        m_aLogger.logInfo( aMsg , false);
    }

    @Override
    public void startElement(String aUri, String aLocalName, String aQName, Attributes aAtts) throws SAXException {
        if( aUri.equals(DRAW_NAMESPACE_URI) && 
            (aLocalName.equals(POLYGON) || aLocalName.equals(POLYLINE) || aLocalName.equals(CONTOUR_POLYGON)) )
        {
            String aPointsValue = aAtts.getValue(DRAW_NAMESPACE_URI,POINTS);
            if( aPointsValue != null && aPointsValue.length() > MAX_POINTS_LEN )
            {
                m_aLogger.logInfo( String.format("'draw:points' of <%s> has been stripped (value starts with '%s')",aQName,aPointsValue.substring(0,40)), false);
                AttributesImpl aNewAtts = new AttributesImpl( aAtts );
                int nAttr = aNewAtts.getIndex(DRAW_NAMESPACE_URI,POINTS);
                int nPos = aPointsValue.lastIndexOf(' ',MAX_POINTS_LEN);
                String aNewValue = nPos != -1 ? aPointsValue.substring(0,nPos) : "";
                aNewAtts.setValue(nAttr, aNewValue );
                aAtts = aNewAtts;
            }
        }
        super.startElement(aUri, aLocalName, aQName, aAtts);
        if( m_bRoot )
        {
            if( !(aUri.equals(OFFICE_NAMESPACE_URI) && aLocalName.equals(m_aLocalElementName)) )
                m_aLogger.logError("Invalid root element: " + aQName );
            m_bRoot = false;
        }
    }

}