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1 /* |
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2 * Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 package com.nokia.microedition.m2g.connection; |
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19 |
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20 |
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21 import java.io.*; |
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22 import javax.microedition.io.*; |
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23 import javax.microedition.m2g.ExternalResourceHandler; |
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24 import javax.microedition.m2g.*; |
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25 |
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26 |
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27 /** |
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28 * <p>This private class is the default resource handler |
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29 * used to load external resources that are referenced |
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30 * within a ScalableImage, namely within a SVG document in the case of SVG. |
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31 * The default resource handler will be used by the platform in the following cases: |
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32 * - if the MIDlet has not explicitly set its own handler to load external resources |
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33 * - if the resource handler specified by the MIDlet is not able to load the |
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34 * external resources (i.e. the MIDlet's SVGResourceHandle.getExternalResource() |
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35 * returns null).</p> |
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36 * @see javax.microedition.m2g.ExternalResourceHandler |
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37 */ |
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38 public class M2GDefaultExternalResourceHandler implements ExternalResourceHandler |
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39 { |
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40 |
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41 /* |
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42 * According to RFC 2396, the rules for determening the base URI can be summarized |
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43 * as follows (highest priority to lowest): |
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44 * 1.The base URI is embedded in the document's content. |
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45 * 2.The base URI is that of the encapsulating document. |
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46 * 3.The base URI is the URI used to retrieve the entity. |
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47 * 4.The base URI is defined by the context of the application |
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48 * |
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49 * Note that in the case of the M2GDefaultExternalResourceHandler 4. is not |
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50 * applicable. |
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51 */ |
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52 |
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53 //-------------------------------------------------- |
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54 // VARIABLES |
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55 //-------------------------------------------------- |
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56 private M2GUrlTokenizer iTokenizer = null; |
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57 |
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58 //-------------------------------------------------- |
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59 // METHODS |
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60 //-------------------------------------------------- |
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61 /** |
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62 * This constructor is used to create a default resource handler that can |
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63 * load resources from absolute URLs and from URLs that are relative |
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64 * to the aUrl. |
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65 * NOTE: This handler will not be allowed to load resources from the application's |
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66 * jar file. |
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67 * |
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68 * @param aUrl The already validated url used to load the svg document |
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69 */ |
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70 M2GDefaultExternalResourceHandler(String aUrl) |
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71 { |
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72 if (aUrl == null || aUrl.equals("")) |
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73 { |
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74 iTokenizer = new M2GUrlTokenizer(); |
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75 } |
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76 else |
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77 { |
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78 iTokenizer = new M2GUrlTokenizer(aUrl); |
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79 } |
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80 } |
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81 |
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82 /** |
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83 * This constructor is used to create a default resource handler that can |
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84 * load external resources from fully qualified URLs ONLY. Any relative URL |
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85 * will be considered to be a link to a resource within the application's jar file. |
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86 */ |
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87 M2GDefaultExternalResourceHandler() |
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88 { |
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89 this(null); |
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90 } |
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91 |
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92 /** |
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93 * This method is invoked when an external resource is required by the underlying implementation. |
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94 * When the request is completed by the implementation of this handler, a notification |
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95 * must be sent to the SVG engine through the requestCompleted() method of <code>ScalableImage</code>. |
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96 * To get a synchronous behaviour, requestCompleted() can be called in the implementation |
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97 * of requestResource. If called later, rendering the document before |
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98 * completing all the requests will just display the currently available content. |
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99 * Once the request is completed, the image will have to be redrawn to reflect the newly |
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100 * available data. |
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101 * For more details on required resources, please refer to the <code>externalResourcesRequired</code> |
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102 * attribute description in the SVG specification. |
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103 * |
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104 * @param image image that originated the external data request |
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105 * @param URL the an absolute or a relative URL for the external resource + drm mode |
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106 */ |
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107 public void requestResource(ScalableImage aImage, String aUrl) |
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108 { |
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109 M2GConnectionProxy proxy = null; |
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110 |
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111 /* IMPLEMENTATION NOTE: |
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112 * The default resource handler assumes that if there is an embedded base URL within the |
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113 * document then is upon the svg engine to provide the absolute URL. |
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114 * If the given URL is a relative URL then this handler will attempt to use as a base URL |
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115 * to retrieve the containing svg document. However, if the document's base |
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116 * URL is null then this handler will assume the given relative URL to be a file name |
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117 * within the application's jar file. |
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118 */ |
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119 try |
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120 { |
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121 // NOTE: if exception is thrown during the resolveExternalResourceUrl() call then |
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122 // the requestCompleted should be called again with a null input stream. |
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123 proxy = M2GConnectionFactory.resolveExternalResourceUrl(iTokenizer, aUrl); |
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124 aImage.requestCompleted(aUrl, proxy.getInputStream()); |
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125 } |
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126 catch (Exception e) |
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127 { |
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128 // e.printStackTrace(); |
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129 // The requestCompleted() failed |
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130 try |
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131 { |
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132 aImage.requestCompleted(aUrl, null); |
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133 } |
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134 catch (Exception ee) |
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135 { |
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136 // ee.printStackTrace(); |
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137 } |
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138 } |
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139 // Close streams |
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140 finally |
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141 { |
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142 try |
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143 { |
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144 if (proxy != null) |
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145 { |
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146 proxy.close(); |
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147 } |
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148 } |
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149 catch (Exception e) |
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150 { |
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151 // e.printStackTrace(); |
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152 } |
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153 } |
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154 } |
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155 } |
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156 |
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157 |