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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" /><title>RSS090Generator xref</title><link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../apidocs/com/sun/syndication/io/impl/RSS090Generator.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*</em><a name="2" href="#2">2</a> <em class="comment"> * Copyright 2004 Sun Microsystems, Inc.</em><a name="3" href="#3">3</a> <em class="comment"> *</em><a name="4" href="#4">4</a> <em class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em><a name="5" href="#5">5</a> <em class="comment"> * you may not use this file except in compliance with the License.</em><a name="6" href="#6">6</a> <em class="comment"> * You may obtain a copy of the License at</em><a name="7" href="#7">7</a> <em class="comment"> *</em><a name="8" href="#8">8</a> <em class="comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em><a name="9" href="#9">9</a> <em class="comment"> *</em><a name="10" href="#10">10</a> <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em><a name="11" href="#11">11</a> <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em><a name="12" href="#12">12</a> <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em><a name="13" href="#13">13</a> <em class="comment"> * See the License for the specific language governing permissions and</em><a name="14" href="#14">14</a> <em class="comment"> * limitations under the License.</em><a name="15" href="#15">15</a> <em class="comment"> *</em><a name="16" href="#16">16</a> <em class="comment"> */</em><a name="17" href="#17">17</a> <strong>package</strong> <a href="../../../../../com/sun/syndication/io/impl/package-summary.html">com.sun.syndication.io.impl</a>;<a name="18" href="#18">18</a> <a name="19" href="#19">19</a> <strong>import</strong> com.sun.syndication.feed.WireFeed;<a name="20" href="#20">20</a> <strong>import</strong> <a href="../../../../../com/sun/syndication/feed/rss/package-summary.html">com.sun.syndication.feed.rss</a>.*;<a name="21" href="#21">21</a> <strong>import</strong> com.sun.syndication.io.FeedException;<a name="22" href="#22">22</a> <strong>import</strong> org.jdom.Document;<a name="23" href="#23">23</a> <strong>import</strong> org.jdom.Element;<a name="24" href="#24">24</a> <strong>import</strong> org.jdom.Namespace;<a name="25" href="#25">25</a> <a name="26" href="#26">26</a> <strong>import</strong> java.util.List;<a name="27" href="#27">27</a> <a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <em>/**<em>*</em></em><a name="30" href="#30">30</a> <em> * Feed Generator for RSS 0.90</em><a name="31" href="#31">31</a> <em> * <p/></em><a name="32" href="#32">32</a> <em> *</em><a name="33" href="#33">33</a> <em> * @author Elaine Chien</em><a name="34" href="#34">34</a> <em> */</em><a name="35" href="#35">35</a> <strong>public</strong> <strong>class</strong> RSS090Generator <strong>extends</strong> <a href="../../../../../com/sun/syndication/io/impl/BaseWireFeedGenerator.html">BaseWireFeedGenerator</a> {<a name="36" href="#36">36</a> <a name="37" href="#37">37</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String RDF_URI = <span class="string">"http://www.w3.org/1999/02/22-rdf-syntax-ns#"</span>;<a name="38" href="#38">38</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String RSS_URI = <span class="string">"http://my.netscape.com/rdf/simple/0.9/"</span>;<a name="39" href="#39">39</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String CONTENT_URI = <span class="string">"http://purl.org/rss/1.0/modules/content/"</span>;<a name="40" href="#40">40</a> <a name="41" href="#41">41</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> Namespace RDF_NS = Namespace.getNamespace(<span class="string">"rdf"</span>, RDF_URI);<a name="42" href="#42">42</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> Namespace RSS_NS = Namespace.getNamespace(RSS_URI);<a name="43" href="#43">43</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> Namespace CONTENT_NS = Namespace.getNamespace(<span class="string">"content"</span>, CONTENT_URI);<a name="44" href="#44">44</a> <a name="45" href="#45">45</a> <strong>public</strong> RSS090Generator() {<a name="46" href="#46">46</a> <strong>this</strong>(<span class="string">"rss_0.9"</span>);<a name="47" href="#47">47</a> }<a name="48" href="#48">48</a> <a name="49" href="#49">49</a> <strong>protected</strong> RSS090Generator(String type) {<a name="50" href="#50">50</a> <strong>super</strong>(type);<a name="51" href="#51">51</a> }<a name="52" href="#52">52</a> <a name="53" href="#53">53</a> <strong>public</strong> Document generate(<a href="../../../../../com/sun/syndication/feed/WireFeed.html">WireFeed</a> feed) throws FeedException {<a name="54" href="#54">54</a> <a href="../../../../../com/sun/syndication/feed/rss/Channel.html">Channel</a> channel = (Channel)feed;<a name="55" href="#55">55</a> Element root = createRootElement(channel);<a name="56" href="#56">56</a> populateFeed(channel,root);<a name="57" href="#57">57</a> <strong>return</strong> createDocument(root);<a name="58" href="#58">58</a> }<a name="59" href="#59">59</a> <a name="60" href="#60">60</a> <strong>protected</strong> Namespace getFeedNamespace() {<a name="61" href="#61">61</a> <strong>return</strong> RSS_NS;<a name="62" href="#62">62</a> }<a name="63" href="#63">63</a> <a name="64" href="#64">64</a> <strong>protected</strong> Namespace getRDFNamespace() {<a name="65" href="#65">65</a> <strong>return</strong> RDF_NS;<a name="66" href="#66">66</a> }<a name="67" href="#67">67</a> <a name="68" href="#68">68</a> <strong>protected</strong> Namespace getContentNamespace() {<a name="69" href="#69">69</a> <strong>return</strong> CONTENT_NS;<a name="70" href="#70">70</a> }<a name="71" href="#71">71</a> <a name="72" href="#72">72</a> <strong>protected</strong> Document createDocument(Element root) {<a name="73" href="#73">73</a> <strong>return</strong> <strong>new</strong> Document(root);<a name="74" href="#74">74</a> }<a name="75" href="#75">75</a> <a name="76" href="#76">76</a> <strong>protected</strong> Element createRootElement(<a href="../../../../../com/sun/syndication/feed/rss/Channel.html">Channel</a> channel) {<a name="77" href="#77">77</a> Element root = <strong>new</strong> Element(<span class="string">"RDF"</span>,getRDFNamespace());<a name="78" href="#78">78</a> root.addNamespaceDeclaration(getFeedNamespace());<a name="79" href="#79">79</a> root.addNamespaceDeclaration(getRDFNamespace());<a name="80" href="#80">80</a> root.addNamespaceDeclaration(getContentNamespace());<a name="81" href="#81">81</a> generateModuleNamespaceDefs(root);<a name="82" href="#82">82</a> <strong>return</strong> root;<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <strong>protected</strong> <strong>void</strong> populateFeed(<a href="../../../../../com/sun/syndication/feed/rss/Channel.html">Channel</a> channel, Element parent) throws FeedException {<a name="86" href="#86">86</a> addChannel(channel,parent);<a name="87" href="#87">87</a> addImage(channel,parent);<a name="88" href="#88">88</a> addTextInput(channel,parent);<a name="89" href="#89">89</a> addItems(channel,parent);<a name="90" href="#90">90</a> generateForeignMarkup(parent, (List)channel.getForeignMarkup());<a name="91" href="#91">91</a> }<a name="92" href="#92">92</a> <a name="93" href="#93">93</a> <strong>protected</strong> <strong>void</strong> addChannel(<a href="../../../../../com/sun/syndication/feed/rss/Channel.html">Channel</a> channel,Element parent) throws FeedException {<a name="94" href="#94">94</a> Element eChannel = <strong>new</strong> Element(<span class="string">"channel"</span>, getFeedNamespace());<a name="95" href="#95">95</a> populateChannel(channel,eChannel);<a name="96" href="#96">96</a> checkChannelConstraints(eChannel);<a name="97" href="#97">97</a> parent.addContent(eChannel);<a name="98" href="#98">98</a> generateFeedModules(channel.getModules(),eChannel);<a name="99" href="#99">99</a> }<a name="100" href="#100">100</a> <a name="101" href="#101">101</a> <em>/**<em>*</em></em><a name="102" href="#102">102</a> <em> * Populates the given channel with parsed data from the ROME element that holds the</em><a name="103" href="#103">103</a> <em> * channel data.</em><a name="104" href="#104">104</a> <em> *</em><a name="105" href="#105">105</a> <em> * @param channel the channel into which parsed data will be added.</em><a name="106" href="#106">106</a> <em> * @param eChannel the XML element that holds the data for the channel.</em><a name="107" href="#107">107</a> <em> */</em><a name="108" href="#108">108</a> <strong>protected</strong> <strong>void</strong> populateChannel(<a href="../../../../../com/sun/syndication/feed/rss/Channel.html">Channel</a> channel,Element eChannel) {<a name="109" href="#109">109</a> String title = channel.getTitle();<a name="110" href="#110">110</a> <strong>if</strong> (title!=<strong>null</strong>) {<a name="111" href="#111">111</a> eChannel.addContent(generateSimpleElement(<span class="string">"title"</span>,title));<a name="112" href="#112">112</a> }<a name="113" href="#113">113</a> String link = channel.getLink();<a name="114" href="#114">114</a> <strong>if</strong> (link!=<strong>null</strong>) {<a name="115" href="#115">115</a> eChannel.addContent(generateSimpleElement(<span class="string">"link"</span>,link));<a name="116" href="#116">116</a> }<a name="117" href="#117">117</a> String description = channel.getDescription();<a name="118" href="#118">118</a> <strong>if</strong> (description!=<strong>null</strong>) {<a name="119" href="#119">119</a> eChannel.addContent(generateSimpleElement(<span class="string">"description"</span>,description));<a name="120" href="#120">120</a> }<a name="121" href="#121">121</a> }<a name="122" href="#122">122</a> <a name="123" href="#123">123</a> <em class="comment">// maxLen == -1 means unlimited.</em><a name="124" href="#124">124</a> <strong>protected</strong> <strong>void</strong> checkNotNullAndLength(Element parent, String childName, <strong>int</strong> minLen, <strong>int</strong> maxLen) throws FeedException {<a name="125" href="#125">125</a> Element child = parent.getChild(childName,getFeedNamespace());<a name="126" href="#126">126</a> <strong>if</strong> (child == <strong>null</strong>) {<a name="127" href="#127">127</a> <strong>throw</strong> <strong>new</strong> <a href="../../../../../com/sun/syndication/io/FeedException.html">FeedException</a>(<span class="string">"Invalid "</span>+getType()+<span class="string">" feed, missing "</span>+parent.getName()+<span class="string">" "</span>+childName);<a name="128" href="#128">128</a> }<a name="129" href="#129">129</a> checkLength(parent,childName,minLen,maxLen);<a name="130" href="#130">130</a> }<a name="131" href="#131">131</a> <a name="132" href="#132">132</a> <em class="comment">// maxLen == -1 means unlimited.</em><a name="133" href="#133">133</a> <strong>protected</strong> <strong>void</strong> checkLength(Element parent, String childName, <strong>int</strong> minLen, <strong>int</strong> maxLen) throws FeedException {⌨️ 快捷键说明
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