/*******************************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *  Actuate Corporation  - initial API and implementation
 *******************************************************************************/

package org.eclipse.birt.report.model.extension;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.eclipse.birt.report.model.api.ModelException;
import org.eclipse.birt.report.model.api.elements.SemanticError;
import org.eclipse.birt.report.model.api.extension.ExtendedElementException;
import org.eclipse.birt.report.model.api.extension.IPropertyDefinition;
import org.eclipse.birt.report.model.api.extension.IReportItem;
import org.eclipse.birt.report.model.api.extension.IReportItemFactory;
import org.eclipse.birt.report.model.api.metadata.IPropertyDefn;
import org.eclipse.birt.report.model.api.metadata.IPropertyType;
import org.eclipse.birt.report.model.api.util.StringUtil;
import org.eclipse.birt.report.model.api.util.UnicodeUtil;
import org.eclipse.birt.report.model.core.DesignElement;
import org.eclipse.birt.report.model.core.Module;
import org.eclipse.birt.report.model.core.Structure;
import org.eclipse.birt.report.model.core.StructureContext;
import org.eclipse.birt.report.model.elements.ExtendedItem;
import org.eclipse.birt.report.model.elements.strategy.CopyPolicy;
import org.eclipse.birt.report.model.metadata.ElementPropertyDefn;
import org.eclipse.birt.report.model.metadata.ElementRefValue;
import org.eclipse.birt.report.model.metadata.ExtensionElementDefn;
import org.eclipse.birt.report.model.metadata.ExtensionModelPropertyDefn;
import org.eclipse.birt.report.model.metadata.PeerExtensionElementDefn;
import org.eclipse.birt.report.model.metadata.PropertyDefn;
import org.eclipse.birt.report.model.metadata.ReferenceValue;
import org.eclipse.birt.report.model.parser.treebuild.IContentHandler;
import org.eclipse.birt.report.model.util.ModelUtil;
import org.eclipse.birt.report.model.util.ReferenceValueUtil;

/**
 * Represents the extensibility provider which supports the peer extension. The
 * peer extension means the third-party can define the extension element with
 * extension properties and extension model in extension definition file. The
 * extension element has its own display name, and attributes, which makes it
 * looks like a new element. However, the extension element is based on the
 * <code>ReportItem</code>, which Model defines, and can have style properties.
 * The extension element can define two type of properties:
 * <ul>
 * <li>The Extension Property - It is also defined in extension definition file.
 * It provides the name, data type, display name key and so on, as the system
 * property works for the Model-defined element.
 * <li>The Extension Model Property - It is defined by {@link IReportItem},
 * instead in extension definition file. <code>IReportItem</code> defines its
 * own dynamic model. The extension model property definition is defined by
 * {@link IPropertyDefinition}. The dynamic model means the extension element
 * can switch from one set of extension model properties to another under some
 * case. They can be serialized to an XML-type extension property when saving to
 * design file, and deserialized from this XML-type extension property when
 * loading design file.
 * </ul>
 * 
 */

public abstract class PeerExtensibilityProvider
		extends
			ModelExtensibilityProvider implements IContentHandler
{

	/**
	 * Peer element for the extension. It is created when the application
	 * invokes UI for the item.
	 */

	IReportItem reportItem = null;

	/**
	 * Cached property values for extension properties, which is defined in
	 * extension definition file.
	 */

	HashMap extensionPropValues = new HashMap( );

	/**
	 * 
	 */
	Map encryptionMap = null;

	/**
	 * Constructs the peer extensibility provider with the extensible element
	 * and the extension name.
	 * 
	 * @param element
	 *            the extensible element
	 * @param extensionName
	 *            the extension name
	 */

	public PeerExtensibilityProvider( DesignElement element,
			String extensionName )
	{
		super( element, extensionName );
	}

	/**
	 * Returns the read-only list of all property definitions, including not
	 * only those defined in Model and extension definition file, but those
	 * defined by <code>IReportItem</code>. The returned list is read-only, so
	 * no modification is allowed on this list. Each one in list is the instance
	 * of <code>IPropertyDefn</code>.
	 * 
	 * @return the read-only list of all property definitions. Return empty list
	 *         if there is no property defined.
	 */

	public List getPropertyDefns( )
	{
		List props = super.getPropertyDefns( );

		PeerExtensionElementDefn extDefn = (PeerExtensionElementDefn) getExtDefn( );

		// if no extension definition exists, just return the definition on
		// extended item.

		if ( extDefn == null )
			return props;

		// If the extension provides dynamic property list, add them.

		IPropertyDefinition[] dynamicProps = getExtensionModelPropertyDefns( );
		if ( dynamicProps != null )
		{
			for ( int i = 0; i < dynamicProps.length; i++ )
			{
				IPropertyDefinition extProp = dynamicProps[i];
				props.add( new ExtensionModelPropertyDefn( extProp, extDefn
						.getReportItemFactory( ).getMessages( ) ) );
			}
		}

		return props;
	}

	/**
	 * Returns the methods defined on the element. Not only the method on the
	 * extension element definition but also include those defined inside the
	 * extension model.
	 * 
	 * @return the method list
	 */

	public List getModelMethodDefns( )
	{

		// collect the methods defined in the extension plugin.xml, and
		// extends from the Model element.

		PeerExtensionElementDefn extDefn = (PeerExtensionElementDefn) getExtDefn( );
		if ( extDefn == null )
			return Collections.EMPTY_LIST;

		List methods = new ArrayList( );

		if ( extDefn.getMethods( ) != null )
			methods.addAll( extDefn.getMethods( ) );

		if ( reportItem == null )
			reportItem = ( (ExtendedItem) element ).getExtendedElement( );

		if ( reportItem == null )
			return methods;

		// collect the methods defined from the dynamic properties.

		IPropertyDefinition[] dynamicProps = getExtensionModelPropertyDefns( );
		if ( dynamicProps != null )
		{
			for ( int i = 0; i < dynamicProps.length; i++ )
			{
				IPropertyDefinition prop = dynamicProps[i];
				if ( prop.getType( ) == IPropertyType.SCRIPT_TYPE )
					methods.add( new ExtensionModelPropertyDefn( prop, extDefn
							.getReportItemFactory( ).getMessages( ) ) );
			}
		}
		return methods;
	}

	/**
	 * Returns the element property definition with the given name from Model,
	 * the extension definition file or extension model defined by
	 * <code>IReportItem</code>.
	 * 
	 * @param propName
	 *            name of the property
	 * @return the element property definition with the given name
	 */

	public IPropertyDefn getPropertyDefn( String propName )
	{
		IPropertyDefn propDefn = super.getPropertyDefn( propName );
		if ( propDefn == null )
		{
			PeerExtensionElementDefn extDefn = (PeerExtensionElementDefn) getExtDefn( );

			IPropertyDefinition[] extProps = getExtensionModelPropertyDefns( );
			if ( extProps != null )
			{
				for ( int i = 0; i < extProps.length; i++ )
				{
					if ( propName.equalsIgnoreCase( extProps[i].getName( ) ) )
					{
						return new ExtensionModelPropertyDefn( extProps[i],
								extDefn.getReportItemFactory( ).getMessages( ) );
					}
				}
			}
		}

		return propDefn;
	}

	/**
	 * Gets all the extension model properties defined by
	 * <code>IReportItem</code>.
	 * 
	 * @return the extension model properties, null if extended element is null
	 */

	private IPropertyDefinition[] getExtensionModelPropertyDefns( )
	{
		if ( reportItem == null )
			return null;

		return reportItem.getPropertyDefinitions( );
	}

	/**
	 * Gets the list of style masks for Model style properties.
	 * 
	 * @return the list of the style masks
	 */

	protected List getStyleMasks( )
	{
		return Collections.EMPTY_LIST;
	}

	/**
	 * Returns the value of extension property or extension model property.
	 * 
	 * @param module
	 * @param prop
	 * @return the value of the given property. If the property is not found, or
	 *         the value is not set, return null.
	 */

	public Object getExtensionProperty( Module module, ElementPropertyDefn prop )
	{
		assert prop != null;
		String propName = prop.getName( );

		Object value = getReportItemExtensionProperty( module, prop, propName );
		if ( value != null )
			return value;

		// handle all other property values

		value = extensionPropValues.get( propName );

		if ( value == null )
			return null;
		ElementPropertyDefn defn = (ElementPropertyDefn) getPropertyDefn( propName );
		if ( defn.getTypeCode( ) == IPropertyType.ELEMENT_REF_TYPE )
		{
			Module root = element.getRoot( );
			if ( root != null )
				return ReferenceValueUtil.resolveElementReference( root,
						element, defn, (ElementRefValue) value );
		}

		return defn.isEncryptable( )
				? ModelUtil.decryptLocalProperty( element, defn,
						extensionPropValues.get( propName ) )
				: extensionPropValues.get( propName );
	}

	/**
	 * Returns the value of extension model property.
	 * 
	 * @param module
	 * @param prop
	 * @return the value of the given property. If the property is not found, or
	 *         the value is not set, return null.
	 */

	private Object getReportItemExtensionProperty( Module module,
			ElementPropertyDefn prop, String propName )
	{
		if ( isExtensionXMLProperty( propName ) && prop.hasOwnModel( ) )
		{
			if ( reportItem != null )
			{
				ByteArrayOutputStream stream = reportItem.serialize( propName );
				if ( stream == null )
					return null;

				String retValue = null;
				try
				{
					retValue = stream.toString( UnicodeUtil.SIGNATURE_UTF_8 );
				}
				catch ( UnsupportedEncodingException e )
				{
					assert false;
				}
				return retValue;
			}
		}
		else if ( isExtensionModelProperty( propName ) )
		{
			// If this property is extension model property, the instance of
			// IReportItem must exist.

			try
			{
				if ( reportItem == null )
					initializeReportItem( module );
			}
			catch ( ExtendedElementException e )
			{
				return null;
			}

			return reportItem == null ? null : reportItem
					.getProperty( propName );
		}

		return null;
	}

	/**
	 * Returns the value of extension property or extension model property.
	 * 
	 * @param module
	 * @param prop
	 * @return the value of the given property. If the property is not found, or
	 *         the value is not set, return null.
	 */

	public Object getNonReportItemProperty( Module module,
			ElementPropertyDefn prop )
	{
		assert prop != null;
		String propName = prop.getName( );

		// handle all other property values

		Object value = extensionPropValues.get( propName );

		if ( value == null )
			return null;
		ElementPropertyDefn defn = (ElementPropertyDefn) getPropertyDefn( propName );
		if ( defn.getTypeCode( ) == IPropertyType.ELEMENT_REF_TYPE )
		{
			Module root = element.getRoot( );
			if ( root != null )
				return ReferenceValueUtil.resolveElementReference( root,
						element, defn, (ElementRefValue) value );
		}

		return defn.isEncryptable( )
				? ModelUtil.decryptLocalProperty( element, defn,
						extensionPropValues.get( propName ) )
				: extensionPropValues.get( propName );
	}

	/**
	 * Sets the value for extension property or extension model property.
	 * 
	 * @param prop
	 *            the definition of the property
	 * @param value
	 *            the value to set
	 */

	public void setExtensionProperty( ElementPropertyDefn prop, Object value )
	{
		if ( isExtensionXMLProperty( prop.getName( ) ) && prop.hasOwnModel( ) )
		{
			if ( reportItem != null )
			{
				try
				{
					if ( value != null )
					{
						byte[] raw = null;
						try
						{
							raw = value.toString( ).getBytes(
									UnicodeUtil.SIGNATURE_UTF_8 );
						}
						catch ( UnsupportedEncodingException e )
						{
							assert false;
						}

						reportItem.deserialize( prop.getName( ),
								new ByteArrayInputStream( raw ) );
					}
					else
						reportItem.deserialize( prop.getName( ),
								new ByteArrayInputStream( new byte[0] ) );
				}
				catch ( ExtendedElementException e )
				{
					assert false;
				}
			}
			else
			{
				setExtensionPropertyValue( prop, value );
			}
		}
		else if ( isExtensionModelProperty( prop.getName( ) ) )
		{
			// If this property is extension model property, the instance of
			// IReportItem must exist.

			assert reportItem != null;

			reportItem.setProperty( prop.getName( ), value );
		}
		else
		{
			setExtensionPropertyValue( prop, value );
		}
	}

	/**
	 * Sets the value of the given property, which is extension property.
	 * 
	 * @param propName
	 *            the name of the property
	 * @param value
	 *            the value to set
	 */

	private void setExtensionPropertyValue( ElementPropertyDefn prop,
			Object value )
	{
		String propName = prop.getName( );
		Object oldValue = extensionPropValues.get( propName );

		if ( prop.getTypeCode( ) == IPropertyType.ELEMENT_REF_TYPE )
		{
			ElementRefValue oldRef = (ElementRefValue) oldValue;
			ReferenceValueUtil.updateReference( element, oldRef,
					(ReferenceValue) value, prop );
		}

		if ( value != null )
			extensionPropValues.put( propName, value );
		else
			extensionPropValues.remove( propName );

	}

	/**
	 * Initializes the extension element instance of <code>IReportItem</code>.
	 * 
	 * @param module
	 *            module
	 * @throws ExtendedElementException
	 *             if the extension is not found or it's failed to initialized
	 *             the extension element instance.
	 */

	public void initializeReportItem( Module module )
			throws ExtendedElementException
	{

		if ( reportItem != null )
			return;

		PeerExtensionElementDefn extDefn = (PeerExtensionElementDefn) getExtDefn( );
		if ( extDefn == null )
			throw new ExtendedElementException( element,
					ModelException.PLUGIN_ID,
					SemanticError.DESIGN_EXCEPTION_EXTENSION_NOT_FOUND, null );

		IReportItemFactory elementFactory = extDefn.getReportItemFactory( );
		assert elementFactory != null;

		reportItem = elementFactory.newReportItem( element.getHandle( module ) );

		List localPropDefns = extDefn.getLocalProperties( );
		for ( int i = 0; i < localPropDefns.size( ); i++ )
		{
			ElementPropertyDefn propDefn = (ElementPropertyDefn) localPropDefns
					.get( i );

			if ( propDefn.getTypeCode( ) != IPropertyType.XML_TYPE
					|| !propDefn.canInherit( ) || !propDefn.hasOwnModel( ) )
				continue;

			String propName = propDefn.getName( );
			Object value = extensionPropValues.get( propName );
			if ( value == null )
			{
				// Get the raw xml data from parent.
				ExtendedItem parent = (ExtendedItem) ModelUtil
						.getParent( element );
				while ( parent != null )
				{
					// get the value from the parent provider: read from the
					// hashmap or the reporItem
					PeerExtensibilityProvider parentProvider = parent
							.getExtensibilityProvider( );
					HashMap propValues = parentProvider.extensionPropValues;
					value = propValues.get( propName );
					if ( value == null )
					{
						if ( parentProvider.reportItem != null )
							value = parentProvider.reportItem
									.serialize( propName );
					}

					if ( value != null )
						break;

					parent = (ExtendedItem) ModelUtil.getParent( parent );
				}
			}
			else
			{
				// if the item caches the property values of extension, transfer
				// them and then clear the cached values

				this.extensionPropValues.remove( propName );
			}

			if ( value != null )
			{
				byte[] raw = null;
				try
				{
					// if value is ByteArrayOutputStream : the value is
					// serialized by Model property calling method
					// IReportItem.serialize(String), since value.toString may
					// change UTF-8 bytes into unicode 16 bytes
					if ( value instanceof ByteArrayOutputStream )
						raw = ( (ByteArrayOutputStream) value ).toByteArray( );
					else
						raw = value.toString( ).getBytes(
								UnicodeUtil.SIGNATURE_UTF_8 );
				}
				catch ( UnsupportedEncodingException e )
				{
					assert false;
				}

				if ( reportItem != null )
					reportItem.deserialize( propName, new ByteArrayInputStream(
							raw ) );
			}
		}
	}

	/**
	 * Tests whether the property is an extension model property or not.
	 * 
	 * @param propName
	 *            name of the property to check
	 * @return true if the property is extension model property, otherwise false
	 */

	public boolean isExtensionModelProperty( String propName )
	{
		if ( reportItem != null )
		{
			IPropertyDefinition[] extProps = reportItem
					.getPropertyDefinitions( );
			if ( extProps != null )
			{
				for ( int i = 0; i < extProps.length; i++ )
				{
					IPropertyDefinition extProp = extProps[i];
					assert extProp != null;

					if ( propName.equals( extProp.getName( ) ) )
						return true;
				}
			}
		}
		return false;
	}

	/**
	 * Tests whether the property is the extension property which holds the
	 * serialized XML value for extension model properties. The property type
	 * should be XML.
	 * 
	 * @param propName
	 *            name of the property to check
	 * @return true if the property is XML type and holds the serialized XML
	 *         value for extension model properties, otherwise false
	 */

	public boolean isExtensionXMLProperty( String propName )
	{
		ExtensionElementDefn extDefn = getExtDefn( );
		if ( extDefn != null )
		{
			ElementPropertyDefn propDefn = (ElementPropertyDefn) extDefn
					.getProperty( propName );
			if ( propDefn != null && propDefn.hasOwnModel( )
					&& IPropertyType.XML_TYPE == propDefn.getTypeCode( ) )
				return true;
		}

		return false;
	}

	/**
	 * Copies the extension values and extension element instance, which
	 * implements <code>IReportItem</code>.
	 * 
	 * @param source
	 *            the source peer extensibility provider
	 */

	public void copyFromWithElementType( PeerExtensibilityProvider source,
			CopyPolicy policy )
	{
		Iterator it = source.extensionPropValues.keySet( ).iterator( );
		while ( it.hasNext( ) )
		{
			String propName = (String) it.next( );
			PropertyDefn propDefn = element.getPropertyDefn( propName );
			if ( !propDefn.isElementType( ) )
				continue;

			Object value = source.extensionPropValues.get( propName );
			if ( value == null )
				continue;

			Object valueToSet = ModelUtil.copyValue( propDefn, value, policy );

			if ( valueToSet == null )
				continue;
			extensionPropValues.put( propName, valueToSet );

			// if the property is element type, then set-up the container
			// relationship

			if ( propDefn.isList( ) )
			{
				List values = (List) valueToSet;
				for ( int i = 0; i < values.size( ); i++ )
				{
					DesignElement item = (DesignElement) values.get( i );
					item.setContainer( element, propName );
				}
			}
			else
			{
				( (DesignElement) valueToSet ).setContainer( element, propName );
			}

		}
	}

	/**
	 * Copies the extension values and extension element instance, which
	 * implements <code>IReportItem</code>.
	 * 
	 * @param source
	 *            the source peer extensibility provider
	 */

	public void copyFromWithNonElementType( PeerExtensibilityProvider source )
	{
		// if the extended element is not null, just copy it

		reportItem = null;
		if ( source.reportItem != null )
		{
			reportItem = source.reportItem.copy( );
		}

		// copy encryption map

		if ( source.encryptionMap != null && !source.encryptionMap.isEmpty( ) )
		{
			if ( encryptionMap == null )
				encryptionMap = new HashMap( );
			encryptionMap.putAll( source.encryptionMap );
		}

		// extension Properties has been reallocated as a new hash map. There is
		// no need to new again.

		if ( extensionPropValues == null )
			extensionPropValues = new HashMap( );

		Iterator it = source.extensionPropValues.keySet( ).iterator( );
		while ( it.hasNext( ) )
		{
			String propName = (String) it.next( );
			PropertyDefn propDefn = element.getPropertyDefn( propName );
			if ( propDefn.isElementType( ) )
				continue;

			Object value = source.extensionPropValues.get( propName );
			if ( value == null )
				continue;

			Object valueToSet = ModelUtil.copyValue( propDefn, value );

			if ( valueToSet == null )
				continue;

			extensionPropValues.put( propName, valueToSet );
		}
	}

	/**
	 * Return the extension element, which implements the interface
	 * <code>IReportItem</code>.
	 * 
	 * @return the extension element
	 */

	public IReportItem getExtensionElement( )
	{
		return reportItem;
	}

	/**
	 * Gets the script definition of this extended element.
	 * 
	 * @return the script definition
	 */

	public IPropertyDefinition getScriptPropertyDefinition( )
	{
		if ( reportItem != null )
			return reportItem.getScriptPropertyDefinition( );
		return null;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @seeorg.eclipse.birt.report.model.extension.ExtensibilityProvider#
	 * hasLocalPropertyValues()
	 */

	public boolean hasLocalPropertyValues( )
	{
		if ( !extensionPropValues.isEmpty( )
				|| hasLocalPropertyValuesOnOwnModel( ) )
			return true;

		return false;
	}

	/**
	 * Clears the extended item of this ExtendedItem.
	 */

	public void clearOwnModel( )
	{
		if ( reportItem != null )
			reportItem = null;
	}

	/**
	 * Returns if this extended item has local property values on own model.
	 * 
	 * @return <code>true</code> if this extended item has local property values
	 *         on own model, <code>false</code> otherwise.
	 */

	public boolean hasLocalPropertyValuesOnOwnModel( )
	{
		List localPropDefns = getExtDefn( ).getLocalProperties( );
		for ( int i = 0; i < localPropDefns.size( ); i++ )
		{
			ElementPropertyDefn propDefn = (ElementPropertyDefn) localPropDefns
					.get( i );

			if ( propDefn.getTypeCode( ) != IPropertyType.XML_TYPE
					|| !propDefn.canInherit( ) || !propDefn.hasOwnModel( ) )
				continue;

			String propName = propDefn.getName( );
			Object childValue = extensionPropValues.get( propName );
			if ( childValue != null )
			{
				try
				{
					initializeReportItem( element.getRoot( ) );
				}
				catch ( ExtendedElementException e )
				{
					// do nothing
				}
			}
			else if ( reportItem == null )
				continue;

			childValue = reportItem == null ? null : reportItem
					.serialize( propName );

			if ( childValue == null )
				continue;

			Object parentValue = null;
			ExtendedItem parent = (ExtendedItem) ModelUtil.getParent( element );
			while ( parent != null )
			{
				PeerExtensibilityProvider parentProvider = parent
						.getExtensibilityProvider( );
				parentValue = parentProvider.extensionPropValues.get( propName );
				if ( parentValue != null )
				{
					try
					{
						parent.initializeReportItem( parent.getRoot( ) );
					}
					catch ( ExtendedElementException e )
					{
						// do nothing
					}
				}
				else if ( parentProvider.reportItem == null )
				{
					parent = (ExtendedItem) ModelUtil.getParent( parent );
					continue;
				}

				parentValue = parentProvider.reportItem == null
						? null
						: parentProvider.reportItem.serialize( propName );

				if ( parentValue != null )
					break;

				parent = (ExtendedItem) ModelUtil.getParent( parent );
			}

			// compare these two value

			if ( parentValue == null )
				return true;

			if ( childValue.toString( ).equals( parentValue.toString( ) ) )
				continue;

			return true;

		}

		return false;
	}

	/**
	 * Gets the default encryption helper for the extension property.
	 * 
	 * @param propDefn
	 * @return
	 */
	public final String getEncryptionHelperID( ElementPropertyDefn propDefn )
	{
		if ( propDefn == null || !propDefn.isEncryptable( ) )
			return null;
		if ( encryptionMap != null
				&& encryptionMap.get( propDefn.getName( ) ) != null )
		{
			String encryptionID = (String) encryptionMap.get( propDefn
					.getName( ) );
			return encryptionID;
		}
		return null;
	}

	/**
	 * Sets the encryption id for the given property.
	 * 
	 * @param propDefn
	 * @param encryptionID
	 */
	public void setEncryptionHelper( ElementPropertyDefn propDefn,
			String encryptionID )
	{
		String id = StringUtil.trimString( encryptionID );
		if ( encryptionMap == null )
			encryptionMap = new HashMap( );
		if ( id == null )
			encryptionMap.remove( propDefn.getName( ) );
		else
			encryptionMap.put( propDefn.getName( ), id );
	}

	/**
	 * Handles invalid property value. The property definition is valid and
	 * extensible while the value is invalid.
	 * 
	 * @param propName
	 * @param value
	 */
	abstract public void handleInvalidPropertyValue( String propName,
			Object value );

	/**
	 * Handles undefined property. The property definition is not found.
	 * 
	 * @param propName
	 * @param value
	 */
	abstract public void handleUndefinedProperty( String propName, Object value );

	/**
	 * Handles undefined children. The child is not allowed to be inserted to
	 * the container.
	 * 
	 * @param propName
	 * @param child
	 */
	abstract public void handleIllegalChildren( String propName,
			DesignElement child );

	/**
	 * Returns the map for properties that has invalid values.
	 * 
	 * @return
	 */
	abstract public Map getInvalidPropertyValueMap( );

	/**
	 * 
	 * @return
	 */

	abstract public Map getUndefinedPropertyMap( );

	/**
	 * 
	 * @return
	 */
	abstract public Map getIllegalContents( );

	/**
	 * Determines whether this children needs to do parser compatibility.
	 * 
	 * @return
	 */
	public boolean needCheckCompatibility( )
	{
		// if ( getInvalidPropertyValueMap( ) != null &&
		// !getInvalidPropertyValueMap( ).isEmpty( ) )
		// return true;
		// if ( getUndefinedPropertyMap( ) != null &&
		// !getUndefinedPropertyMap( ).isEmpty( ) )
		// return true;
		// if ( getIllegalContents( ) != null && !getIllegalContents( ).isEmpty(
		// ) )
		// return true;
		// return false;
		return true;
	}
}
