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/*
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* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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package com.nokia.microedition.m2g.connection;
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import java.io.*;
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import javax.microedition.io.*;
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import javax.microedition.m2g.ExternalResourceHandler;
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import javax.microedition.m2g.*;
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/**
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* <p>This private class is the default resource handler
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* used to load external resources that are referenced
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* within a ScalableImage, namely within a SVG document in the case of SVG.
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* The default resource handler will be used by the platform in the following cases:
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* - if the MIDlet has not explicitly set its own handler to load external resources
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* - if the resource handler specified by the MIDlet is not able to load the
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* external resources (i.e. the MIDlet's SVGResourceHandle.getExternalResource()
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* returns null).</p>
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* @see javax.microedition.m2g.ExternalResourceHandler
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*/
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public class M2GDefaultExternalResourceHandler implements ExternalResourceHandler
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{
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/*
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* According to RFC 2396, the rules for determening the base URI can be summarized
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* as follows (highest priority to lowest):
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* 1.The base URI is embedded in the document's content.
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* 2.The base URI is that of the encapsulating document.
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* 3.The base URI is the URI used to retrieve the entity.
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* 4.The base URI is defined by the context of the application
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*
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* Note that in the case of the M2GDefaultExternalResourceHandler 4. is not
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* applicable.
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*/
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//--------------------------------------------------
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// VARIABLES
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//--------------------------------------------------
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private M2GUrlTokenizer iTokenizer = null;
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//--------------------------------------------------
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// METHODS
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//--------------------------------------------------
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/**
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* This constructor is used to create a default resource handler that can
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* load resources from absolute URLs and from URLs that are relative
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* to the aUrl.
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* NOTE: This handler will not be allowed to load resources from the application's
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* jar file.
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*
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* @param aUrl The already validated url used to load the svg document
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*/
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M2GDefaultExternalResourceHandler(String aUrl)
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{
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if (aUrl == null || aUrl.equals(""))
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{
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iTokenizer = new M2GUrlTokenizer();
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}
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else
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{
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iTokenizer = new M2GUrlTokenizer(aUrl);
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}
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}
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/**
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* This constructor is used to create a default resource handler that can
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* load external resources from fully qualified URLs ONLY. Any relative URL
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* will be considered to be a link to a resource within the application's jar file.
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*/
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M2GDefaultExternalResourceHandler()
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{
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this(null);
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}
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/**
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* This method is invoked when an external resource is required by the underlying implementation.
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* When the request is completed by the implementation of this handler, a notification
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* must be sent to the SVG engine through the requestCompleted() method of <code>ScalableImage</code>.
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* To get a synchronous behaviour, requestCompleted() can be called in the implementation
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* of requestResource. If called later, rendering the document before
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* completing all the requests will just display the currently available content.
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* Once the request is completed, the image will have to be redrawn to reflect the newly
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* available data.
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* For more details on required resources, please refer to the <code>externalResourcesRequired</code>
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* attribute description in the SVG specification.
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*
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* @param image image that originated the external data request
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* @param URL the an absolute or a relative URL for the external resource + drm mode
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*/
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public void requestResource(ScalableImage aImage, String aUrl)
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{
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M2GConnectionProxy proxy = null;
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/* IMPLEMENTATION NOTE:
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* The default resource handler assumes that if there is an embedded base URL within the
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* document then is upon the svg engine to provide the absolute URL.
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* If the given URL is a relative URL then this handler will attempt to use as a base URL
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* to retrieve the containing svg document. However, if the document's base
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* URL is null then this handler will assume the given relative URL to be a file name
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* within the application's jar file.
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*/
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try
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{
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// NOTE: if exception is thrown during the resolveExternalResourceUrl() call then
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// the requestCompleted should be called again with a null input stream.
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proxy = M2GConnectionFactory.resolveExternalResourceUrl(iTokenizer, aUrl);
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aImage.requestCompleted(aUrl, proxy.getInputStream());
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}
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catch (Exception e)
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{
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// e.printStackTrace();
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// The requestCompleted() failed
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try
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{
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aImage.requestCompleted(aUrl, null);
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}
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catch (Exception ee)
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{
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// ee.printStackTrace();
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}
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}
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// Close streams
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finally
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{
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try
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{
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if (proxy != null)
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{
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proxy.close();
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}
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}
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catch (Exception e)
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{
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// e.printStackTrace();
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}
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}
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}
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}
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