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 * 
 * 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
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 *************************************************************/



package org.openoffice.java.accessibility.logging;

import com.sun.star.accessibility.*;
import com.sun.star.uno.*;

/**
 *
 */
public class XAccessibleEventLog implements XAccessibleEventListener {
    
    private static XAccessibleEventLog theEventListener = null;
    
    private static java.util.Hashtable proxyList = new java.util.Hashtable();
    
    /** Creates a new instance of UNOAccessibleEventListener */
    public XAccessibleEventLog() {
    }
    
    private static XAccessibleEventListener get() {
        if (theEventListener == null) {
            theEventListener = new XAccessibleEventLog();
        }
        return theEventListener;
    }
    
    public static void addEventListener(XAccessibleContext xac, java.awt.Component c) {
        XAccessibleEventBroadcaster broadcaster = (XAccessibleEventBroadcaster)
            UnoRuntime.queryInterface(XAccessibleEventBroadcaster.class, xac);
        if (broadcaster != null) {
            broadcaster.addEventListener(XAccessibleEventLog.get());
            
            // remember the proxy objects
            synchronized (proxyList) {
//                proxyList.put(UnoRuntime.generateOid(xac), new WeakReference(c));
                proxyList.put(UnoRuntime.generateOid(xac), c);
            }
        }
    }

    public void disposing(com.sun.star.lang.EventObject eventObject) {
    }    
        
    public void notifyEvent(com.sun.star.accessibility.AccessibleEventObject accessibleEventObject) {
        switch (accessibleEventObject.EventId) {
            case AccessibleEventId.ACTIVE_DESCENDANT_CHANGED:
                logMessage(accessibleEventObject.Source, "Retrieved active descendant event.");
                break;
            case AccessibleEventId.STATE_CHANGED:
                logStateChange(accessibleEventObject.Source,
                    accessibleEventObject.OldValue, 
                    accessibleEventObject.NewValue);
                break;
            case AccessibleEventId.CHILD:
                logMessage(accessibleEventObject.Source, "Retrieved children event.");
                break;
           case AccessibleEventId.BOUNDRECT_CHANGED:
                logMessage(accessibleEventObject.Source, "Retrieved boundrect changed event.");
                break;
           case AccessibleEventId.VISIBLE_DATA_CHANGED:
                logMessage(accessibleEventObject.Source, "Retrieved visible data changed event.");
                break;
           case AccessibleEventId.INVALIDATE_ALL_CHILDREN:
                logMessage(accessibleEventObject.Source, "Retrieved invalidate children event.");
                break;
            default:
                break;
        }
    }
    
    public void logStateChange(Object o, Object any1, Object any2) {
        try {
            if (AnyConverter.isShort(any1)) {
                logStateChange(o, AnyConverter.toShort(any1), " is no longer ");
            }

            if (AnyConverter.isShort(any2)) {
                logStateChange(o, AnyConverter.toShort(any2), " is now ");
            }
        } catch (com.sun.star.lang.IllegalArgumentException e) {
        }
    }
    
    public void logStateChange(Object o, short n, String s) {
        switch(n) {
            case AccessibleStateType.ACTIVE:
                logMessage(o, s + javax.accessibility.AccessibleState.ACTIVE);
                break;
            case AccessibleStateType.ARMED:
                logMessage(o, s + javax.accessibility.AccessibleState.ARMED);
                break;
            case AccessibleStateType.CHECKED:
                logMessage(o, s + javax.accessibility.AccessibleState.CHECKED);
                break;
            case AccessibleStateType.ENABLED:
                logMessage(o, s + javax.accessibility.AccessibleState.ENABLED);
                break;
            case AccessibleStateType.FOCUSED:
                logMessage(o, s + javax.accessibility.AccessibleState.FOCUSED);
                break;
            case AccessibleStateType.PRESSED:
                logMessage(o, s + javax.accessibility.AccessibleState.PRESSED);
                break;
            case AccessibleStateType.SELECTED:
                logMessage(o, s + javax.accessibility.AccessibleState.SELECTED);
                break;
            case AccessibleStateType.SENSITIVE:
                logMessage(o, s + "sensitive");
                break;
            case AccessibleStateType.SHOWING:
                logMessage(o, s + javax.accessibility.AccessibleState.SHOWING);
                break;
            case AccessibleStateType.VISIBLE:
                logMessage(o, s + javax.accessibility.AccessibleState.VISIBLE);
                break;
            default:
                logMessage(o, s + "??? (FIXME)");
                break;
        }
    }
    
    protected static void logMessage(Object o, String s) {
        XAccessibleContext xac = (XAccessibleContext) UnoRuntime.queryInterface(XAccessibleContext.class, o);
        if( xac != null ) {
            String oid = UnoRuntime.generateOid(xac);
            synchronized (proxyList) {
                  logMessage( (javax.accessibility.Accessible) proxyList.get( oid ), s );                
//                WeakReference r = (WeakReference) proxyList.get( oid );
//                if(r != null) {
//                    System.err.println( "*** Warning *** event is " + r.get() );
//                    logMessage( (javax.accessibility.Accessible) r.get(), s );
//                } else {
//                    System.err.println( "*** Warning *** event source not found in broadcaster list" );
//                }
            }
        } else 
            System.err.println( "*** Warning *** event source does not implement XAccessibleContext" );
    }

    protected static void logMessage(javax.accessibility.Accessible a, String s) {
        if (a != null) {
            logMessage(a.getAccessibleContext(), s);
        } else {
            logMessage(s);
        }
    }
        
    protected static void logMessage(javax.accessibility.AccessibleContext ac, String s) {
        if (ac != null) {
            logMessage("[" + ac.getAccessibleRole() + "] " 
                + ac.getAccessibleName() + ": " + s);
        } else {
            logMessage(s);
        }
    }
            
    protected static void logMessage(String s) {
        System.err.println(s);
    }
}