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<a name="1" href="#1">1</a> <em class="comment">/*</em>
<a name="2" href="#2">2</a> <em class="comment"> * DisplayMenuTag.java</em>
<a name="3" href="#3">3</a> <em class="comment"> *</em>
<a name="4" href="#4">4</a> <em class="comment"> * Created on February 14, 2001, 11:44 AM</em>
<a name="5" href="#5">5</a> <em class="comment"> */</em>
<a name="6" href="#6">6</a> <strong>package</strong> net.sf.navigator.taglib;
<a name="7" href="#7">7</a>
<a name="8" href="#8">8</a>
<a name="9" href="#9">9</a> <strong>import</strong> net.sf.navigator.displayer.MenuDisplayer;
<a name="10" href="#10">10</a> <strong>import</strong> net.sf.navigator.menu.MenuComponent;
<a name="11" href="#11">11</a> <strong>import</strong> net.sf.navigator.menu.MenuRepository;
<a name="12" href="#12">12</a> <strong>import</strong> org.apache.commons.logging.Log;
<a name="13" href="#13">13</a> <strong>import</strong> org.apache.commons.logging.LogFactory;
<a name="14" href="#14">14</a> <strong>import</strong> org.apache.struts.taglib.TagUtils;
<a name="15" href="#15">15</a>
<a name="16" href="#16">16</a> <strong>import</strong> javax.servlet.http.HttpServletRequest;
<a name="17" href="#17">17</a> <strong>import</strong> javax.servlet.http.HttpServletResponse;
<a name="18" href="#18">18</a> <strong>import</strong> javax.servlet.jsp.JspException;
<a name="19" href="#19">19</a> <strong>import</strong> javax.servlet.jsp.tagext.TagSupport;
<a name="20" href="#20">20</a> <strong>import</strong> java.io.IOException;
<a name="21" href="#21">21</a> <strong>import</strong> java.net.MalformedURLException;
<a name="22" href="#22">22</a>
<a name="23" href="#23">23</a>
<a name="24" href="#24">24</a> <em>/**</em>
<a name="25" href="#25">25</a> <em> * <p>The major behavior of this tag is to set the value for the usage in the</em>
<a name="26" href="#26">26</a> <em> * HTML hyperlink 'href' attribute. The value is determined by the following</em>
<a name="27" href="#27">27</a> <em> * attributes defined in menu-config.xml, in this prioritize order:</em>
<a name="28" href="#28">28</a> <em> * 'location', 'page', 'forward', 'action'.</em>
<a name="29" href="#29">29</a> <em> *</em>
<a name="30" href="#30">30</a> <em> * <p>You can now define a 'forward' or 'action' attribute in the</em>
<a name="31" href="#31">31</a> <em> * &lt;Item&gt; element in your menu-config.xml. The 'action' attribute takes</em>
<a name="32" href="#32">32</a> <em> * the value of a Logical Struts Action name for which to look up the</em>
<a name="33" href="#33">33</a> <em> * context-relative URI. The resultant URI will carry the Context</em>
<a name="34" href="#34">34</a> <em> * Path (if any), Module Prefix (if any), Session ID (if any),</em>
<a name="35" href="#35">35</a> <em> * and Servlet Mapping (path mapping or extension mapping). Here is</em>
<a name="36" href="#36">36</a> <em> * an example:</em>
<a name="37" href="#37">37</a> <em> * <pre></em>
<a name="38" href="#38">38</a> <em> * &lt;Menu name="indexMenuMore" title="More Examples"&gt;</em>
<a name="39" href="#39">39</a> <em> * &lt;Item name="actionExample" title="Example - 'action' attribute"</em>
<a name="40" href="#40">40</a> <em> * <B>action="/menu/bullet"</B>/&gt;</em>
<a name="41" href="#41">41</a> <em> * &lt;Item name="pageExample" title="Example - 'page' attribute"</em>
<a name="42" href="#42">42</a> <em> * <B>page="/bulletmenu.jsp"</B>/&gt;</em>
<a name="43" href="#43">43</a> <em> * &lt;/Menu&gt;</em>
<a name="44" href="#44">44</a> <em> * </pre></em>
<a name="45" href="#45">45</a> <em> * @author ssayles, mraible</em>
<a name="46" href="#46">46</a> <em> * @version $Revision: 1.23 $ $Date: 2006/10/22 07:16:39 $</em>
<a name="47" href="#47">47</a> <em> */</em>
<a name="48" href="#48">48</a> <strong>public</strong> <strong>class</strong> <a href="../../../../net/sf/navigator/taglib/DisplayMenuTag.html">DisplayMenuTag</a> <strong>extends</strong> TagSupport {
<a name="49" href="#49">49</a> <em class="comment">//~ Instance fields ========================================================</em>
<a name="50" href="#50">50</a>
<a name="51" href="#51">51</a> <strong>protected</strong> <strong>final</strong> <strong>static</strong> Log log = LogFactory.getLog(DisplayMenuTag.<strong>class</strong>);
<a name="52" href="#52">52</a> <strong>private</strong> String name;
<a name="53" href="#53">53</a> <strong>private</strong> String target;
<a name="54" href="#54">54</a>
<a name="55" href="#55">55</a> <em class="comment">//~ Methods ================================================================</em>
<a name="56" href="#56">56</a> <strong>public</strong> <strong>void</strong> setName(String name) {
<a name="57" href="#57">57</a> <strong>this</strong>.name = name;
<a name="58" href="#58">58</a> }
<a name="59" href="#59">59</a>
<a name="60" href="#60">60</a> <strong>public</strong> <strong>void</strong> setTarget(String target) {
<a name="61" href="#61">61</a> <strong>this</strong>.target = target;
<a name="62" href="#62">62</a> }
<a name="63" href="#63">63</a>
<a name="64" href="#64">64</a> <strong>public</strong> <strong>int</strong> doStartTag() throws JspException {
<a name="65" href="#65">65</a> <a href="../../../../net/sf/navigator/displayer/MenuDisplayer.html">MenuDisplayer</a> displayer =
<a name="66" href="#66">66</a> (<a href="../../../../net/sf/navigator/displayer/MenuDisplayer.html">MenuDisplayer</a>) pageContext.getAttribute(UseMenuDisplayerTag.DISPLAYER_KEY);
<a name="67" href="#67">67</a>
<a name="68" href="#68">68</a> <strong>if</strong> (displayer == <strong>null</strong>) {
<a name="69" href="#69">69</a> <strong>throw</strong> <strong>new</strong> JspException(<span class="string">"Could not retrieve the menu displayer."</span>);
<a name="70" href="#70">70</a> }
<a name="71" href="#71">71</a>
<a name="72" href="#72">72</a> <em class="comment">// This is set by the parent tag - UseMenuDisplayerTag</em>
<a name="73" href="#73">73</a> <a href="../../../../net/sf/navigator/menu/MenuRepository.html">MenuRepository</a> repository =
<a name="74" href="#74">74</a> (<a href="../../../../net/sf/navigator/menu/MenuRepository.html">MenuRepository</a>) pageContext.getAttribute(UseMenuDisplayerTag.PRIVATE_REPOSITORY);
<a name="75" href="#75">75</a>
<a name="76" href="#76">76</a> <strong>if</strong> (repository == <strong>null</strong>) {
<a name="77" href="#77">77</a> <strong>throw</strong> <strong>new</strong> JspException(<span class="string">"Could not obtain the menu repository"</span>);
<a name="78" href="#78">78</a> }
<a name="79" href="#79">79</a>
<a name="80" href="#80">80</a> <a href="../../../../net/sf/navigator/menu/MenuComponent.html">MenuComponent</a> menu = repository.getMenu(<strong>this</strong>.name);
<a name="81" href="#81">81</a>
<a name="82" href="#82">82</a> <strong>if</strong> (menu != <strong>null</strong>) {
<a name="83" href="#83">83</a> <strong>try</strong> {
<a name="84" href="#84">84</a> <em class="comment">// use the overridden target</em>
<a name="85" href="#85">85</a> <strong>if</strong> (target != <strong>null</strong>) {
<a name="86" href="#86">86</a> displayer.setTarget(<strong>this</strong>.target);
<a name="87" href="#87">87</a> }
<a name="88" href="#88">88</a>
<a name="89" href="#89">89</a> <em class="comment">// set the location value to use</em>
<a name="90" href="#90">90</a> <em class="comment">// the context relative page attribute</em>
<a name="91" href="#91">91</a> <em class="comment">// if specified in the menu</em>
<a name="92" href="#92">92</a> <strong>try</strong> {
<a name="93" href="#93">93</a> setPageLocation(menu);
<a name="94" href="#94">94</a> } <strong>catch</strong> (MalformedURLException m) {
<a name="95" href="#95">95</a> log.error(<span class="string">"Incorrect action or forward: "</span> + m.getMessage());
<a name="96" href="#96">96</a> log.warn(<span class="string">"Menu '"</span> + menu.getName() + <span class="string">"' location set to #"</span>);
<a name="97" href="#97">97</a> menu.setLocation(<span class="string">"#"</span>);
<a name="98" href="#98">98</a> }
<a name="99" href="#99">99</a>
<a name="100" href="#100">100</a> displayer.display(menu);
<a name="101" href="#101">101</a> displayer.setTarget(<strong>null</strong>);
<a name="102" href="#102">102</a> } <strong>catch</strong> (Exception e) {
<a name="103" href="#103">103</a> <em class="comment">// don't swallow the exception</em>
<a name="104" href="#104">104</a> e.printStackTrace();
<a name="105" href="#105">105</a> <strong>throw</strong> <strong>new</strong> JspException(e);
<a name="106" href="#106">106</a> }
<a name="107" href="#107">107</a> } <strong>else</strong> {
<a name="108" href="#108">108</a> String error = UseMenuDisplayerTag.messages.getString(<span class="string">"menu.not.found"</span>) +
<a name="109" href="#109">109</a> <span class="string">" "</span> + <strong>this</strong>.name;
<a name="110" href="#110">110</a> log.warn(error);
<a name="111" href="#111">111</a> <strong>try</strong> {
<a name="112" href="#112">112</a> pageContext.getOut().write(error);
<a name="113" href="#113">113</a> } <strong>catch</strong> (IOException io) {
<a name="114" href="#114">114</a> <strong>throw</strong> <strong>new</strong> JspException(error);
<a name="115" href="#115">115</a> }
<a name="116" href="#116">116</a> }
<a name="117" href="#117">117</a>
<a name="118" href="#118">118</a> <strong>return</strong> SKIP_BODY;
<a name="119" href="#119">119</a> }
<a name="120" href="#120">120</a>
<a name="121" href="#121">121</a> <em>/**</em>
<a name="122" href="#122">122</a> <em> * Sets the value for the menu location to the</em>
<a name="123" href="#123">123</a> <em> * appropriate value if location is null. If location</em>
<a name="124" href="#124">124</a> <em> * is null, and the page attribute exists, it's value</em>
<a name="125" href="#125">125</a> <em> * will be set to the the value for page prepended with</em>
<a name="126" href="#126">126</a> <em> * the context path of the application.</em>
<a name="127" href="#127">127</a> <em> *</em>
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