wirefeedoutput.html

解析RSS工具源码

<a name="97" href="#97">97</a>  <em>     * default charset encoding is used to write the feed to the file. It is the responsibility</em>
<a name="98" href="#98">98</a>  <em>     * of the developer to ensure the feed encoding is set to the platform charset encoding.</em>
<a name="99" href="#99">99</a>  <em>     * &lt;p></em>
<a name="100" href="#100">100</a> <em>     * NOTE: This method delages to the 'Document WireFeedOutput#outputJDom(WireFeed)'.</em>
<a name="101" href="#101">101</a> <em>     * &lt;p></em>
<a name="102" href="#102">102</a> <em>     * @param feed Abstract feed to create XML representation from. The type of the WireFeed must match</em>
<a name="103" href="#103">103</a> <em>     *        the type given to the FeedOuptut constructor.</em>
<a name="104" href="#104">104</a> <em>     * @param file the file where to write the XML representation for the given WireFeed.</em>
<a name="105" href="#105">105</a> <em>     * @throws IllegalArgumentException thrown if the feed type of the WireFeedOutput and WireFeed don't match.</em>
<a name="106" href="#106">106</a> <em>     * @throws IOException thrown if there was some problem writing to the File.</em>
<a name="107" href="#107">107</a> <em>     * @throws FeedException thrown if the XML representation for the feed could not be created.</em>
<a name="108" href="#108">108</a> <em>     *</em>
<a name="109" href="#109">109</a> <em>     */</em>
<a name="110" href="#110">110</a>     <strong>public</strong> <strong>void</strong> output(<a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> feed,File file) throws IllegalArgumentException,IOException,FeedException {
<a name="111" href="#111">111</a>         Writer writer = <strong>new</strong> FileWriter(file);
<a name="112" href="#112">112</a>         output(feed,writer);
<a name="113" href="#113">113</a>         writer.close();
<a name="114" href="#114">114</a>     }
<a name="115" href="#115">115</a> 
<a name="116" href="#116">116</a>     <em>/**<em>*</em></em>
<a name="117" href="#117">117</a> <em>     * Writes to an Writer the XML representation for the given WireFeed.</em>
<a name="118" href="#118">118</a> <em>     * &lt;p></em>
<a name="119" href="#119">119</a> <em>     * If the feed encoding is not NULL, it will be used in the XML prolog encoding attribute. It is the responsibility</em>
<a name="120" href="#120">120</a> <em>     * of the developer to ensure the Writer instance is using the same charset encoding.</em>
<a name="121" href="#121">121</a> <em>     * &lt;p></em>
<a name="122" href="#122">122</a> <em>     * NOTE: This method delages to the 'Document WireFeedOutput#outputJDom(WireFeed)'.</em>
<a name="123" href="#123">123</a> <em>     * &lt;p></em>
<a name="124" href="#124">124</a> <em>     * @param feed Abstract feed to create XML representation from. The type of the WireFeed must match</em>
<a name="125" href="#125">125</a> <em>     *        the type given to the FeedOuptut constructor.</em>
<a name="126" href="#126">126</a> <em>     * @param writer Writer to write the XML representation for the given WireFeed.</em>
<a name="127" href="#127">127</a> <em>     * @throws IllegalArgumentException thrown if the feed type of the WireFeedOutput and WireFeed don't match.</em>
<a name="128" href="#128">128</a> <em>     * @throws IOException thrown if there was some problem writing to the Writer.</em>
<a name="129" href="#129">129</a> <em>     * @throws FeedException thrown if the XML representation for the feed could not be created.</em>
<a name="130" href="#130">130</a> <em>     *</em>
<a name="131" href="#131">131</a> <em>     */</em>
<a name="132" href="#132">132</a>     <strong>public</strong> <strong>void</strong> output(<a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> feed,Writer writer) throws IllegalArgumentException,IOException, FeedException {
<a name="133" href="#133">133</a>         Document doc = outputJDom(feed);
<a name="134" href="#134">134</a>         String encoding = feed.getEncoding();
<a name="135" href="#135">135</a>         Format format = Format.getPrettyFormat();
<a name="136" href="#136">136</a>         <strong>if</strong> (encoding!=<strong>null</strong>) {
<a name="137" href="#137">137</a>             format.setEncoding(encoding);
<a name="138" href="#138">138</a>         }
<a name="139" href="#139">139</a>         XMLOutputter outputter = <strong>new</strong> XMLOutputter(format);
<a name="140" href="#140">140</a>         outputter.output(doc,writer);
<a name="141" href="#141">141</a>     }
<a name="142" href="#142">142</a> 
<a name="143" href="#143">143</a>     <em>/**<em>*</em></em>
<a name="144" href="#144">144</a> <em>     * Creates a W3C DOM document for the given WireFeed.</em>
<a name="145" href="#145">145</a> <em>     * &lt;p></em>
<a name="146" href="#146">146</a> <em>     * This method does not use the feed encoding property.</em>
<a name="147" href="#147">147</a> <em>     * &lt;p></em>
<a name="148" href="#148">148</a> <em>     * NOTE: This method delages to the 'Document WireFeedOutput#outputJDom(WireFeed)'.</em>
<a name="149" href="#149">149</a> <em>     * &lt;p></em>
<a name="150" href="#150">150</a> <em>     * @param feed Abstract feed to create W3C DOM document from. The type of the WireFeed must match</em>
<a name="151" href="#151">151</a> <em>     *        the type given to the FeedOuptut constructor.</em>
<a name="152" href="#152">152</a> <em>     * @return the W3C DOM document for the given WireFeed.</em>
<a name="153" href="#153">153</a> <em>     * @throws IllegalArgumentException thrown if the feed type of the WireFeedOutput and WireFeed don't match.</em>
<a name="154" href="#154">154</a> <em>     * @throws FeedException thrown if the W3C DOM document for the feed could not be created.</em>
<a name="155" href="#155">155</a> <em>     *</em>
<a name="156" href="#156">156</a> <em>     */</em>
<a name="157" href="#157">157</a>     <strong>public</strong> org.w3c.dom.Document outputW3CDom(<a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> feed) throws IllegalArgumentException,FeedException {
<a name="158" href="#158">158</a>         Document doc = outputJDom(feed);
<a name="159" href="#159">159</a>         DOMOutputter outputter = <strong>new</strong> DOMOutputter();
<a name="160" href="#160">160</a>         <strong>try</strong> {
<a name="161" href="#161">161</a>             <strong>return</strong> outputter.output(doc);
<a name="162" href="#162">162</a>         }
<a name="163" href="#163">163</a>         <strong>catch</strong> (JDOMException jdomEx) {
<a name="164" href="#164">164</a>             <strong>throw</strong> <strong>new</strong> <a href="../../../../com/sun/syndication/io/FeedException.html">FeedException</a>(<span class="string">"Could not create DOM"</span>,jdomEx);
<a name="165" href="#165">165</a>         }
<a name="166" href="#166">166</a>     }
<a name="167" href="#167">167</a> 
<a name="168" href="#168">168</a>     <em>/**<em>*</em></em>
<a name="169" href="#169">169</a> <em>     * Creates a JDOM document for the given WireFeed.</em>
<a name="170" href="#170">170</a> <em>     * &lt;p></em>
<a name="171" href="#171">171</a> <em>     * This method does not use the feed encoding property.</em>
<a name="172" href="#172">172</a> <em>     * &lt;p></em>
<a name="173" href="#173">173</a> <em>     * NOTE: All other output methods delegate to this method.</em>
<a name="174" href="#174">174</a> <em>     * &lt;p></em>
<a name="175" href="#175">175</a> <em>     * @param feed Abstract feed to create JDOM document from. The type of the WireFeed must match</em>
<a name="176" href="#176">176</a> <em>     *        the type given to the FeedOuptut constructor.</em>
<a name="177" href="#177">177</a> <em>     * @return the JDOM document for the given WireFeed.</em>
<a name="178" href="#178">178</a> <em>     * @throws IllegalArgumentException thrown if the feed type of the WireFeedOutput and WireFeed don't match.</em>
<a name="179" href="#179">179</a> <em>     * @throws FeedException thrown if the JDOM document for the feed could not be created.</em>
<a name="180" href="#180">180</a> <em>     *</em>
<a name="181" href="#181">181</a> <em>     */</em>
<a name="182" href="#182">182</a>     <strong>public</strong> Document outputJDom(<a href="../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> feed) throws IllegalArgumentException,FeedException {
<a name="183" href="#183">183</a>         String type = feed.getFeedType();
<a name="184" href="#184">184</a>         <a href="../../../../com/sun/syndication/io/WireFeedGenerator.html">WireFeedGenerator</a> generator = GENERATORS.getGenerator(type);
<a name="185" href="#185">185</a>         <strong>if</strong> (generator==<strong>null</strong>) {
<a name="186" href="#186">186</a>             <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"Invalid feed type ["</span>+type+<span class="string">"]"</span>);
<a name="187" href="#187">187</a>         }
<a name="188" href="#188">188</a> 
<a name="189" href="#189">189</a>         <strong>if</strong> (!generator.getType().equals(type)) {
<a name="190" href="#190">190</a>             <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"WireFeedOutput type["</span>+type+<span class="string">"] and WireFeed type ["</span>+
<a name="191" href="#191">191</a>                                                type+<span class="string">"] don't match"</span>);
<a name="192" href="#192">192</a>         }
<a name="193" href="#193">193</a>         <strong>return</strong> generator.generate(feed);
<a name="194" href="#194">194</a>     }
<a name="195" href="#195">195</a> 
<a name="196" href="#196">196</a> }
</pre>
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