/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 * 
 * 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.
 * 
 *************************************************************/


package com.sun.star.xml.security.uno;

/* uno classes */
import com.sun.star.uno.UnoRuntime;
import com.sun.star.lang.XMultiComponentFactory;
import com.sun.star.uno.XComponentContext;

import com.sun.star.xml.crypto.*;
import com.sun.star.xml.crypto.sax.*;

/*
 * this class maintains the data for a security operation.
 */
class SecurityEntity
{
	/*
	 * the security id, which identifies this security entity
	 * uniquely.
	 */
	private static int m_nNextSecurityId = 1;
	protected int m_nSecurityId;
	
	/*
	 * xml security related components
	 */
	protected XXMLSecurityContext        m_xXMLSecurityContext;
	protected XXMLSignature              m_xXMLSignature;
	protected XXMLEncryption             m_xXMLEncryption;
	protected XMultiComponentFactory     m_xRemoteServiceManager;
	protected XComponentContext          m_xRemoteContext;
	protected XReferenceResolvedListener m_xReferenceResolvedListener;
	protected XSecuritySAXEventKeeper    m_xSAXEventKeeper;

	/*
	 * the uri of the key material of this security entity
	 */
	private String m_keyURI;
	
	SecurityEntity(
		XSecuritySAXEventKeeper xSAXEventKeeper,
		XXMLSecurityContext xXMLSecurityContext,
		XXMLSignature xXMLSignature,
		XXMLEncryption xXMLEncryption,
		XMultiComponentFactory xRemoteServiceManager,
		XComponentContext xRemoteContext)
	{
		m_xSAXEventKeeper = xSAXEventKeeper;
		m_xXMLSecurityContext = xXMLSecurityContext;
		m_xXMLSignature = xXMLSignature;
		m_xXMLEncryption = xXMLEncryption;
		m_xRemoteServiceManager = xRemoteServiceManager;
		m_xRemoteContext = xRemoteContext;
		
		m_nSecurityId = getNextSecurityId();
		m_keyURI = null;
	}

/**************************************************************************************
 * private methods
 **************************************************************************************/
	
	/*
	 * generates a new security id.
	 */
	private static int getNextSecurityId()
	{
		int id = m_nNextSecurityId++;
		return id;
	}

/**************************************************************************************
 * protected methods
 **************************************************************************************/
	
	/*
	 * notifies the key collector about the key id, this key id
	 * is used to ask the SAXEventKeeper to release the bufferred
	 * key element.
	 * when the id is 0, that means there is no independant key
	 * element needed.
	 */
	protected void setKeyId(int id)
	{
		try
		{
			XKeyCollector xKeyCollector = 
				(XKeyCollector)UnoRuntime.queryInterface(
					XKeyCollector.class, m_xReferenceResolvedListener);
			xKeyCollector.setKeyId(id);
		}
		catch( com.sun.star.uno.Exception e)
		{
			e.printStackTrace();
		}
	}
	
	/*
	 * set the key uri, which will be the value of the id attribute
	 * of the key element
	 */
	protected void setKeyURI(String uri)
	{
		m_keyURI = new String(uri);
	}
	
	protected XReferenceResolvedListener getReferenceListener()
	{
		return m_xReferenceResolvedListener;
	}
	
	protected int getSecurityId()
	{
		return m_nSecurityId;
	}
	
	/*
	 * configures the key material to the security entity.
	 *
	 * if the uri is the key, then:
	 * 1. askes the SAXEventKeeper to add a ElementCollector to the key
	 * element;
	 * 2. notifies the key collector;
	 * 3. configures this ElementCollector's security id;
	 * 4. tells the SAXEventKeeper which listener will receive the reference
	 * resolved notification.
	 */
	protected boolean setKey(String uri, boolean isExporting)
	{
		boolean rc = false;
		
		if (m_keyURI != null &&
			m_keyURI.equals(uri))
		{
			int referenceId = m_xSAXEventKeeper.addSecurityElementCollector(
				isExporting?
				(ElementMarkPriority.BEFOREMODIFY):(ElementMarkPriority.AFTERMODIFY),
				false );
				
			setKeyId(referenceId);
			m_xSAXEventKeeper.setSecurityId(referenceId, m_nSecurityId);

			XReferenceResolvedBroadcaster xReferenceResolvedBroadcaster = 
				(XReferenceResolvedBroadcaster)UnoRuntime.queryInterface(
					XReferenceResolvedBroadcaster.class, m_xSAXEventKeeper);
			
			xReferenceResolvedBroadcaster.addReferenceResolvedListener(referenceId, m_xReferenceResolvedListener);
				
			rc = true;
		}
		
		return rc;
	}
	
	/*
	 * ends this misstion, asks the security engine to clear up all
	 * resources.
	 */
	protected boolean endMission()
	{
		XMissionTaker xMissionTaker = 
			(XMissionTaker)UnoRuntime.queryInterface(
				XMissionTaker.class, m_xReferenceResolvedListener);
		
		boolean rc = xMissionTaker.endMission();
		
		m_xXMLSecurityContext = null;
		m_xXMLSignature = null;
		m_xXMLEncryption = null;
		m_xReferenceResolvedListener = null;
		m_xSAXEventKeeper = null;
		
		return rc;
	}
}