javauis/mmapi_qt/baseline/javasrc/com/nokia/microedition/media/animation/AnimationPlayerFactory.java
/*
* Copyright (c) 2010 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: This class has been implemented for playing the GIF animation
* Earlier implementation were dependent on native API, but now AnimationPlayer
* will be not use any native code, and all the implementation here is using eswt API
*
*/
package com.nokia.microedition.media.animation;
import java.io.IOException;
import javax.microedition.media.MediaException;
import javax.microedition.media.protocol.DataSource;
import org.eclipse.swt.SWTException;
import com.nokia.microedition.media.InternalPlayer;
import com.nokia.microedition.media.Locator;
import com.nokia.microedition.media.PlugIn;
import com.nokia.mj.impl.utils.Logger;
/**
* This class is used for playing GIF image animation. This class also
* implements PlugIn interface which is used from ManagerImpl.
* Entire Animation playing is written using eSWT API.
* There is no call to native.
*
*/
public class AnimationPlayerFactory implements PlugIn
{
// Used to recognize supported locators.
// private static final String ANIMATION_FILE_EXTENSION = ".gif";
// Used to get supported protocols and content type.
private static final String ANIMATION_CONTENT_TYPE = "image/gif";
private static final String ANIMATION_HTTP_PROTOCOL = "http";
private static final String ANIMATION_HTTPS_PROTOCOL = "https";
private static final String ANIMATION_FILE_PROTOCOL = "file";
// There is no need to read the first 6 byte and compare it with following string
// private static final String ANIMATION_GIF_HEADER="GIF89a";
/**
* From PlugIn
*/
public InternalPlayer createPlayer(DataSource aDataSource)
throws MediaException, IOException
{
final String DEBUG_STR="AnimationPlayerFactory::createPlayer()";
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,DEBUG_STR+"+");
InternalPlayer player = null;
String contentType = aDataSource.getContentType();
// There is no difference in if and else block
// in first if block only checking if the content type is available
// Player is being created in the same way
// First try to create player from content type
if (contentType != null)
{
if (contentType.equals(ANIMATION_CONTENT_TYPE))
{
player = new AnimationPlayer(aDataSource);
}
// else{
// throw new MediaException("Content type not supported: " + contentType);
// }
} //Since it was not possible to identify the player from content type, identify it from it's header
// Is there any need to create player through Locator?
else
{
// We need only 6 bytes to identify whether it's GIF image data or not.
// But the problem here is that if we will read even a single byte from stream
// that stream won't be useful for loading the image data through ImageLoader class
// So better solution is to let the ImageLoader.load(InputStream ) get called
// if it successfully load the image, then it means that stream is intended for this player only
// otherwise it will throw the SWTException, catch it and return properly
try
{
player = new AnimationPlayer(aDataSource);
}
catch (SWTException e)
{
// Simply ignore the exception
e.printStackTrace();
}
}
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,DEBUG_STR+"-");
return player;
}
/**
* @param locator
* @return Interplayer object
* @throws IOException
*/
public InternalPlayer createPlayer(String locator) throws IOException
{
final String DEBUG_STR="AnimationPlayerFactory::createPlayer(String locator )";
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,DEBUG_STR+"+");
InternalPlayer player = null;
try
{
player = new AnimationPlayer(locator);
}
catch (SWTException e)
{
// For all cases ImageLoader.load throws only SWTException
// here we are finding why it has throws this Exception
// if it is IOException we need to pass it to caller
if (e.getCause().toString().indexOf((IOException.class.getName()))!=-1)
throw new IOException();
// if exception is due to any other reason, just ignore it
e.printStackTrace();
}
Logger.LOG(Logger.EJavaMMAPI, Logger.EInfo,DEBUG_STR+"-");
return player;
}
/**
* From PlugIn
*/
public String[] getSupportedContentTypes(String aProtocol)
{
String[] types = new String[0];
if (aProtocol == null || aProtocol.equals(ANIMATION_HTTP_PROTOCOL)
|| aProtocol.equals(ANIMATION_HTTPS_PROTOCOL)
|| aProtocol.equals(ANIMATION_FILE_PROTOCOL))
{
types = new String[1];
types[0] = ANIMATION_CONTENT_TYPE;
}
return types;
}
/**
* From PlugIn
*/
public String[] getSupportedProtocols(String aContentType)
{
String[] protocols = new String[0];
if ((aContentType == null)
|| aContentType.equals(ANIMATION_CONTENT_TYPE))
{
protocols = new String[3];
protocols[0] = ANIMATION_HTTP_PROTOCOL;
protocols[1] = ANIMATION_HTTPS_PROTOCOL;
protocols[2] = ANIMATION_FILE_PROTOCOL;
}
// else empty array is returned
return protocols;
}
/**
* From PlugIn. Empty implementation.
*/
public void preparePlayer(InternalPlayer aPlayer) throws MediaException
{
}
}