/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Externalizes a DOM Document to a byte array.

 *

*/

package com.nokia.tools.themeinstaller.odtconverter;

import java.awt.Color;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import com.nokia.tools.themeinstaller.cssparser.CSSDOMProcessor;

import com.nokia.tools.themeinstaller.cssparser.CSSHandler;

import com.nokia.tools.themeinstaller.cssparser.PseudoClassResolver;

/**

 * Externalizes DOM Document to a byte array.

 */

public class DOMExternalizer

    {

    // CONSTANTS

    // Text elements according to CXnDomVisitor::KXnElementVisitorTable and

    // CXnODTParser

    private static final String TEXT_ELEMENT = "text";

    private static final String DESC_ELEMENT = "desc";

    private static final String MARQUEE_ELEMENT = "marquee";

    private static final String OBJECT_ELEMENT = "object";

    private static final String NEWSTICKER_ELEMENT = "newsticker";

    // Attribute name if node is refnode

    private static final String REF_NODE = "ref";

    // List types

    private static final int UNKNOWN = -1;

    private static final int NODE = 0;

    private static final int ATTRIBUTE = 1;

    private static final int PROPERTY = 2;

    // The Constant COLOR_TABLE_SIZE

    private static final int COLOR_TABLE_SIZE = 3;

    // Pseudo class resolver

    private PseudoClassResolver iPseudoResolver;

    // The value type resolver

    private ValueTypeResolver iValueTypeResolver;

    // String pool

    private StringPool iStringPool;

    // DOM Document

    private Document iDocument;

    // Byte output stream for delivering the externalized data

    private ByteArrayOutputStream iBaos;

    // Data output stream for writing to the baos

    private ODTDataOutputStream iODTDos;

    // Node id and counter

    private int iCurrentNodeId = 0;

    /** CSSDOMProsessor for checking property's inheritance value. */

    private CSSDOMProcessor iCSSDOMProsessor;

    /**

     * Constructor.

     * @param aDocument DOM Document to externalize

     */

    public DOMExternalizer( Document aDocument )

        {

        iPseudoResolver = new PseudoClassResolver();

        iValueTypeResolver = new ValueTypeResolver();

        iCSSDOMProsessor = new CSSDOMProcessor();

        iStringPool = new StringPool();

        iDocument = aDocument;

        iBaos = new ByteArrayOutputStream();

        iODTDos = new ODTDataOutputStream( iBaos );

        }

    /* (non-Javadoc)

     * @see java.lang.Object#finalize()

     */

    protected void finalize() throws Throwable

        {

        iODTDos.close();

        iBaos.close();

        }

    /**

     * Externalizes the DOM document and string pool to a byte array.

     * @return Byte array containing the document

     * @throws IOException if writing to a stream fails

     * @throws ODTException

     */

    public byte[] getByteArray() throws IOException, ODTException

        {

        ByteArrayOutputStream result = new ByteArrayOutputStream();

        byte[] resultArray = null;

        try

            {

            // Externalize the DOM

            doExternalize();

            // Externalize the string pool

            result.write( iStringPool.toByteArray() );

            // Write the dom contents to the result baos

            result.write( iBaos.toByteArray() );

            resultArray = result.toByteArray();

            }

        finally

            {

            if( result != null )

                {

                result.close();

                }

            }

        return resultArray;

        }

    /**

     * Do the externalization process.

     * @throws IOException if data output stream can not be written

     * @throws ODTException if there is an error with property value externalization

     */

    private void doExternalize() throws IOException, ODTException

        {

        Node rootElement = iDocument.getDocumentElement();

        if( rootElement != null )

            {

            // Root node exists

            iODTDos.writeBoolean( true );

            externalizeNode( ( Node )rootElement, true );

            }

        else

            {

            // No root node

            iODTDos.writeBoolean( false );

            }

        }

    /**

     * Externalizes a node in the DOM tree.

     * @param aNode Node to externalize

     * @param aRootNode true, if this is the root node of the tree

     * @throws IOException if data output stream can not be written

     * @throws ODTException if there is an error with property value externalization

     */

    private void externalizeNode( Node aNode, boolean aRootNode )

        throws IOException, ODTException

        {

        // Write name

        String name = aNode.getNodeName();

        int nameRef = iStringPool.addString( name );

        iODTDos.writeInt16( nameRef );

        // Write name space

        String ns = aNode.getNamespaceURI();

        int nsRef = iStringPool.addString( ns );

        iODTDos.writeInt16( nsRef );

        // Check and write refnode boolean

        iODTDos.writeBoolean( checkRefNode( aNode ) );

        boolean textNodeFound = false;

        // Write parsed character data

        StringBuffer pcData = new StringBuffer();

        if( TEXT_ELEMENT.equals( name ) ||

            DESC_ELEMENT.equals( name ) ||

            MARQUEE_ELEMENT.equals( name ) ||

            OBJECT_ELEMENT.equals( name ) ||

            NEWSTICKER_ELEMENT.equals( name ) )

            {

            NodeList list = aNode.getChildNodes();

            for( int i = 0; i < list.getLength() ; i++ )

                {

                Node nod = list.item( i );

                if( nod.getNodeType() == Node.TEXT_NODE )

                    {

                    textNodeFound = true;

                    String textNodeValue = nod.getNodeValue();

                    pcData.append( textNodeValue );

                    }

                }

            }

        // Write data length and the data

        iODTDos.writeBoolean( textNodeFound );

        if( textNodeFound )

            {

            // Write text length

            iODTDos.writeInt16( pcData.length() );

            // Write text node value

            iODTDos.writeString8( pcData.toString() );

            }

        // Update the counter and write node id

        iODTDos.writeInt32( iCurrentNodeId++ );

        // Externalize the child list

        externalizeNodeList( aNode );

        // Externalize the attribute list

        externalizeAttributeList( aNode );

        // Externalize the property list

        externalizePropertyList( aNode );

        }

    /**

     * Checks if node is refnode.

     * Node is refnode if some of node's attributes name is "ref".

     * @param aNode Node containing the attributes

     * @return boolean true if node is refnode, otherwise false

     */

    private boolean checkRefNode( Node aNode )

        {

        boolean refNode = false;

        NamedNodeMap list = aNode.getAttributes();

        for ( int i = 0; i < list.getLength(); i++ )

            {

            Node node = list.item( i );

            if ( nodeType( node ) == ATTRIBUTE )

                {

                if( node.getNodeName().equals( REF_NODE ) )

                    {

                    refNode = true;

                    }

                }

            }

        return refNode;

        }

    /**

     * Externalizes attributes of a node.

     * @param aNode Node containing the attributes

     * @throws IOException if writing to a stream fails

     * @throws ODTException

     */

    private void externalizeAttributeNode( Node aNode )

        throws IOException, ODTException

        {

        // Write name

        String name = aNode.getNodeName();

        int nameRef = iStringPool.addString( name );

        iODTDos.writeInt16( nameRef );

        // Write value

        String value = aNode.getNodeValue();

        int valueRef = iStringPool.addString( value );

        iODTDos.writeInt16( valueRef );

        }

    /**

     * Externalizes a property node.

     *

     * @param aNode Node containing the properties

     * @param aParentNode Node's parent node

     *

     * @throws IOException if data output stream can not be written

     * @throws ODTException if there is an error with property

     * value externalization

     */

    private void externalizePropertyNode( Node aParentNode, Node aNode )

        throws IOException, ODTException

        {

        // Get property node attributes: property name, values and pseudo class

        NamedNodeMap list = aNode.getAttributes();

        // Property value list

        boolean isInherited = externalizePropertyValueList( aParentNode, list );

        iODTDos.writeBoolean( isInherited );

        // Resolve pseudo class

        int pseudoClass = PseudoClassResolver.NONE;

        int count = list.getLength();

        for( int i = 0; i < count; i++ )

            {

            // Browse through all attributes of the style property element and

            // seek for a pseudo class

            Node item = list.item( i );

            if( item.getNodeName().equals( CSSDOMProcessor.STRING_PSEUDOCLASS ) )

                {

                pseudoClass = iPseudoResolver.getKey( item.getNodeValue() );

                if( pseudoClass == UNKNOWN )

                    {

                    throw new ODTException( "Error externalizing ODT/styles: " +

                    		"unknown pseudo class" );

                    }

                break;

                }

            }

        // Pseudo class -> int8

        iODTDos.writeByte( pseudoClass );

        }

    /**

     * Externalize a list of nodes.

     * @param aParentNode Parent node

     * @throws IOException if data output stream can not be written

     * @throws ODTException if there is an error with property value externalization

     */

    private void externalizeNodeList( Node aParentNode ) throws IOException, ODTException

        {

        // Write list type

        iODTDos.writeByte( NODE );

        NodeList list = aParentNode.getChildNodes();

        // Count element nodes

        int count = countNodes( list );

        // Write element node count

        iODTDos.writeInt32( count );

        for ( int i = 0; i < list.getLength(); i++ )

            {

            Node node = list.item( i );

            if ( nodeType( node ) == NODE )

                {

                externalizeNode( node, false );

                }

            }

        }

    /**

     * Externalize a list of attributes.

     * @param aParentNode Node containing the attributes.

     * @throws IOException if writing to a stream fails

     * @throws ODTException

     */

    private void externalizeAttributeList( Node aParentNode )

            throws IOException, ODTException

        {

        // Write list type

        iODTDos.writeByte( ATTRIBUTE );

        NamedNodeMap list = aParentNode.getAttributes();

        // Count element nodes

        int count = countAttributes( list );

        // Write element node count

        iODTDos.writeInt32( count );

        for ( int i = 0; i < list.getLength(); i++ )

            {

            Node node = list.item( i );

            if ( nodeType( node ) == ATTRIBUTE )

                {

                externalizeAttributeNode( node );

                }

            }

        }

    /**

     * Externalize a list of properties.

     * @param aParentNode Node containing the properties

     * @throws IOException if data output stream can not be written

     * @throws ODTException if there is an error with property value externalization

     */

    private void externalizePropertyList( Node aParentNode ) throws IOException, ODTException

        {

        // Write list type

        iODTDos.writeByte( PROPERTY );

        NodeList list = aParentNode.getChildNodes();

        // Count element nodes

        int count = countProperties( list );

        // Write element node count

        iODTDos.writeInt32( count );

        for ( int i = 0; i < list.getLength(); i++ )

            {

            Node node = list.item( i );

            if ( nodeType( node ) == PROPERTY )

                {

                externalizePropertyNode( aParentNode, node );

                }

            }

        }

    /**

     * Parses a Color from string.

     *

     * @param aColor Color values in String made by CSSHandler

     *

     * @return The color

     *

     * @throws ODTException the ODT exception

     */

    private Color parseColorFromString( String aColor ) throws ODTException

        {

        String sx[] = aColor.split( CSSHandler.COMMA );

        int ix[] = new int[ sx.length ];

        // LexicalUnit.SAC_RGBCOLOR knows color values with format

        // rgb(0, 0, 0) and #000. That is, with three parameters

        if ( sx.length != COLOR_TABLE_SIZE )

            {

            throw new ODTException( "Error in DOM/style data externalization: "

                    + "RGB Values: parameter amount" );

            }

        for ( int i = 0; i < sx.length; i++ )

            {

            if ( sx[ i ].contains( CSSHandler.SEPARATOR ) )

                {

                // Check if single color's value is integer

                Short valueType = iValueTypeResolver.getValue( Short

                        .valueOf( sx[ i ].substring( 0, sx[ i ]

                                .indexOf( CSSHandler.SEPARATOR ) ) ) );

                if ( valueType.intValue() != ValueTypeResolver.E_NUMBER )

                    {

                    throw new ODTException(

                            "Error in DOM/style data externalization: "

                                    + "RGB Values: R, G or B not interger" );

                    }

                String redGreenBlue = sx[ i ].substring( sx[ i ]

                        .indexOf( CSSHandler.SEPARATOR ) + 1, sx[ i ]

                        .length() );

                Integer rgbValue = Integer.valueOf( redGreenBlue );

                ix[ i ] = rgbValue.intValue();

                }

            else

                {

                throw new ODTException(

                        "Error in DOM/style data externalization: "

                                + "RGB Values: can't resolve value type" );

                }

            }

        return new Color( ix[ 0 ], ix[ 1 ], ix[ 2 ] );

        }

    /**

     * Parses the Value Type from Value.

     *

     * @param aAttrValue The attribute value

     *

     * @return Parsed value as a string

     *

     * @throws IOException Signals that an I/O exception has occurred.

     * @throws ODTException

     */

    private String parseAttrValue( String aAttrValue, PropertyValue aPropValue )

        throws IOException, ODTException

        {

        if ( aAttrValue.length() > 0 )

            {

            if ( aAttrValue.contains( "|" ) )

                {

                String type = aAttrValue

                        .substring( 0, aAttrValue.indexOf( '|' ) );

                String value = aAttrValue.substring(

                        aAttrValue.indexOf( '|' ) + 1, aAttrValue.length() );

                Short lexicalUnit = Short.valueOf( type );

                Short primitiveValueType =

                        iValueTypeResolver.getValue( lexicalUnit );

                switch ( primitiveValueType.intValue() )

                    {

                    case ValueTypeResolver.E_NUMBER:

                        double doubleValueInteger = Double.valueOf( value ).doubleValue();

                        aPropValue.setRealValue( doubleValueInteger,

                                                 primitiveValueType.shortValue() );

                        break;

                    case ValueTypeResolver.E_UNIT_VALUE:

                    case ValueTypeResolver.E_PERCENTAGE:

                    case ValueTypeResolver.E_EMS:

                    case ValueTypeResolver.E_EXS:

                    case ValueTypeResolver.E_PX:

                    case ValueTypeResolver.E_CM:

                    case ValueTypeResolver.E_MM:

                    case ValueTypeResolver.E_IN:

                    case ValueTypeResolver.E_PT:

                    case ValueTypeResolver.E_PC:

                    case ValueTypeResolver.E_DEG:

                    case ValueTypeResolver.E_RAD:

                    case ValueTypeResolver.E_GRAD:

                    case ValueTypeResolver.E_MS:

                    case ValueTypeResolver.E_S:

                    case ValueTypeResolver.E_HZ:

                    case ValueTypeResolver.E_KHZ:

                        double doubleValuePercentage = Double.valueOf( value ).doubleValue();

                        aPropValue.setRealValue( doubleValuePercentage,

                                                 primitiveValueType.shortValue() );

                        break;

                    case ValueTypeResolver.E_IDENT:

                    case ValueTypeResolver.E_STRING:

                    case ValueTypeResolver.E_URI: