juplo.de Git - website/blob - dist/http-resources/2.0.0/xref/de/juplo/httpresources/HttpResourceChainAwareResourceLoader.html

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   9 <a class="jxr_linenumber" name="L1" href="#L1">1</a>   <strong class="jxr_keyword">package</strong> de.juplo.httpresources;
  10 <a class="jxr_linenumber" name="L2" href="#L2">2</a>
  11 <a class="jxr_linenumber" name="L3" href="#L3">3</a>   <strong class="jxr_keyword">import</strong> org.slf4j.Logger;
  12 <a class="jxr_linenumber" name="L4" href="#L4">4</a>   <strong class="jxr_keyword">import</strong> org.slf4j.LoggerFactory;
  13 <a class="jxr_linenumber" name="L5" href="#L5">5</a>   <strong class="jxr_keyword">import</strong> org.springframework.core.io.Resource;
  14 <a class="jxr_linenumber" name="L6" href="#L6">6</a>   <strong class="jxr_keyword">import</strong> org.springframework.core.io.ResourceLoader;
  15 <a class="jxr_linenumber" name="L7" href="#L7">7</a>
  16 <a class="jxr_linenumber" name="L8" href="#L8">8</a>   <strong class="jxr_keyword">import</strong> java.util.Arrays;
  17 <a class="jxr_linenumber" name="L9" href="#L9">9</a>
  18 <a class="jxr_linenumber" name="L10" href="#L10">10</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a name="HttpResourceChainAwareResourceLoader" href="../../../de/juplo/httpresources/HttpResourceChainAwareResourceLoader.html#HttpResourceChainAwareResourceLoader">HttpResourceChainAwareResourceLoader</a> <strong class="jxr_keyword">implements</strong> ResourceLoader
  19 <a class="jxr_linenumber" name="L11" href="#L11">11</a>  {
  20 <a class="jxr_linenumber" name="L12" href="#L12">12</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Logger LOG =
  21 <a class="jxr_linenumber" name="L13" href="#L13">13</a>        LoggerFactory.getLogger(HttpResourceChainAwareResourceLoader.<strong class="jxr_keyword">class</strong>);
  22 <a class="jxr_linenumber" name="L14" href="#L14">14</a>
  23 <a class="jxr_linenumber" name="L15" href="#L15">15</a>
  24 <a class="jxr_linenumber" name="L16" href="#L16">16</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> ResourceLoader loader;
  25 <a class="jxr_linenumber" name="L17" href="#L17">17</a>    <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> String[] sources;
  26 <a class="jxr_linenumber" name="L18" href="#L18">18</a>
  27 <a class="jxr_linenumber" name="L19" href="#L19">19</a>
  28 <a class="jxr_linenumber" name="L20" href="#L20">20</a>
  29 <a class="jxr_linenumber" name="L21" href="#L21">21</a>    <strong class="jxr_keyword">public</strong> <a name="HttpResourceChainAwareResourceLoader" href="../../../de/juplo/httpresources/HttpResourceChainAwareResourceLoader.html#HttpResourceChainAwareResourceLoader">HttpResourceChainAwareResourceLoader</a>(
  30 <a class="jxr_linenumber" name="L22" href="#L22">22</a>        ResourceLoader loader,
  31 <a class="jxr_linenumber" name="L23" href="#L23">23</a>        String... sources)
  32 <a class="jxr_linenumber" name="L24" href="#L24">24</a>    {
  33 <a class="jxr_linenumber" name="L25" href="#L25">25</a>      <strong class="jxr_keyword">this</strong>.loader = loader;
  34 <a class="jxr_linenumber" name="L26" href="#L26">26</a>      <strong class="jxr_keyword">this</strong>.sources =
  35 <a class="jxr_linenumber" name="L27" href="#L27">27</a>          Arrays
  36 <a class="jxr_linenumber" name="L28" href="#L28">28</a>              .stream(sources)
  37 <a class="jxr_linenumber" name="L29" href="#L29">29</a>              .map(location -&gt; location.trim())
  38 <a class="jxr_linenumber" name="L30" href="#L30">30</a>              .filter(location -&gt;
  39 <a class="jxr_linenumber" name="L31" href="#L31">31</a>              {
  40 <a class="jxr_linenumber" name="L32" href="#L32">32</a>                <strong class="jxr_keyword">if</strong> (location.length() &gt; 0)
  41 <a class="jxr_linenumber" name="L33" href="#L33">33</a>                  <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
  42 <a class="jxr_linenumber" name="L34" href="#L34">34</a>
  43 <a class="jxr_linenumber" name="L35" href="#L35">35</a>                LOG.warn(<span class="jxr_string">"Filtered out empty entry from list of sources"</span>);
  44 <a class="jxr_linenumber" name="L36" href="#L36">36</a>                <strong class="jxr_keyword">return</strong> false;
  45 <a class="jxr_linenumber" name="L37" href="#L37">37</a>              })
  46 <a class="jxr_linenumber" name="L38" href="#L38">38</a>              .map(location -&gt;
  47 <a class="jxr_linenumber" name="L39" href="#L39">39</a>              {
  48 <a class="jxr_linenumber" name="L40" href="#L40">40</a>                <strong class="jxr_keyword">int</strong> length = location.length();
  49 <a class="jxr_linenumber" name="L41" href="#L41">41</a>                <strong class="jxr_keyword">if</strong> (length &gt; 0 &amp;&amp; location.charAt(length - 1) != '/')
  50 <a class="jxr_linenumber" name="L42" href="#L42">42</a>                {
  51 <a class="jxr_linenumber" name="L43" href="#L43">43</a>                  LOG.info(<span class="jxr_string">"Adding trailing slash to configured source {}"</span>, location);
  52 <a class="jxr_linenumber" name="L44" href="#L44">44</a>                  <strong class="jxr_keyword">return</strong> location + <span class="jxr_string">"/"</span>;
  53 <a class="jxr_linenumber" name="L45" href="#L45">45</a>                }
  54 <a class="jxr_linenumber" name="L46" href="#L46">46</a>                <strong class="jxr_keyword">else</strong>
  55 <a class="jxr_linenumber" name="L47" href="#L47">47</a>                  <strong class="jxr_keyword">return</strong> location;
  56 <a class="jxr_linenumber" name="L48" href="#L48">48</a>              })
  57 <a class="jxr_linenumber" name="L49" href="#L49">49</a>              .toArray(size -&gt; <strong class="jxr_keyword">new</strong> String[size]);
  58 <a class="jxr_linenumber" name="L50" href="#L50">50</a>    }
  59 <a class="jxr_linenumber" name="L51" href="#L51">51</a>
  60 <a class="jxr_linenumber" name="L52" href="#L52">52</a>
  61 <a class="jxr_linenumber" name="L53" href="#L53">53</a>    <em class="jxr_javadoccomment">/**</em>
  62 <a class="jxr_linenumber" name="L54" href="#L54">54</a>  <em class="jxr_javadoccomment">   * Returns the first existing resource, or the first, if non of the</em>
  63 <a class="jxr_linenumber" name="L55" href="#L55">55</a>  <em class="jxr_javadoccomment">   * resources exists.</em>
  64 <a class="jxr_linenumber" name="L56" href="#L56">56</a>  <em class="jxr_javadoccomment">   *</em>
  65 <a class="jxr_linenumber" name="L57" href="#L57">57</a>  <em class="jxr_javadoccomment">   * This mimics the behavior of the original resolver as closeley as possible,</em>
  66 <a class="jxr_linenumber" name="L58" href="#L58">58</a>  <em class="jxr_javadoccomment">   * asuming, that the first source is a / the local one.</em>
  67 <a class="jxr_linenumber" name="L59" href="#L59">59</a>  <em class="jxr_javadoccomment">   *</em>
  68 <a class="jxr_linenumber" name="L60" href="#L60">60</a>  <em class="jxr_javadoccomment">   * @param location The name of the requested resource</em>
  69 <a class="jxr_linenumber" name="L61" href="#L61">61</a>  <em class="jxr_javadoccomment">   * @return The first existing resource, or the first resource - never &lt;code&gt;null&lt;/code&gt;.</em>
  70 <a class="jxr_linenumber" name="L62" href="#L62">62</a>  <em class="jxr_javadoccomment">   */</em>
  71 <a class="jxr_linenumber" name="L63" href="#L63">63</a>    @Override
  72 <a class="jxr_linenumber" name="L64" href="#L64">64</a>    <strong class="jxr_keyword">public</strong> Resource getResource(String location)
  73 <a class="jxr_linenumber" name="L65" href="#L65">65</a>    {
  74 <a class="jxr_linenumber" name="L66" href="#L66">66</a>      <em class="jxr_comment">// We assure in the constructore, that sources always end with a '/'</em>
  75 <a class="jxr_linenumber" name="L67" href="#L67">67</a>      String relativeResourceName =
  76 <a class="jxr_linenumber" name="L68" href="#L68">68</a>          location.charAt(0) == '/'
  77 <a class="jxr_linenumber" name="L69" href="#L69">69</a>              ? location.substring(1)
  78 <a class="jxr_linenumber" name="L70" href="#L70">70</a>              : location;
  79 <a class="jxr_linenumber" name="L71" href="#L71">71</a>
  80 <a class="jxr_linenumber" name="L72" href="#L72">72</a>      <strong class="jxr_keyword">for</strong> (String source : sources)
  81 <a class="jxr_linenumber" name="L73" href="#L73">73</a>      {
  82 <a class="jxr_linenumber" name="L74" href="#L74">74</a>        Resource resource = loader.getResource(source + relativeResourceName);
  83 <a class="jxr_linenumber" name="L75" href="#L75">75</a>
  84 <a class="jxr_linenumber" name="L76" href="#L76">76</a>        <em class="jxr_comment">// Return the resource, if it exists.</em>
  85 <a class="jxr_linenumber" name="L77" href="#L77">77</a>        <strong class="jxr_keyword">if</strong> (resource.exists())
  86 <a class="jxr_linenumber" name="L78" href="#L78">78</a>          <strong class="jxr_keyword">return</strong> resource;
  87 <a class="jxr_linenumber" name="L79" href="#L79">79</a>      }
  88 <a class="jxr_linenumber" name="L80" href="#L80">80</a>
  89 <a class="jxr_linenumber" name="L81" href="#L81">81</a>      <em class="jxr_comment">// If all sources were checked without success, return the resource from</em>
  90 <a class="jxr_linenumber" name="L82" href="#L82">82</a>      <em class="jxr_comment">// the first source, although it does not exists - the contract of an</em>
  91 <a class="jxr_linenumber" name="L83" href="#L83">83</a>      <em class="jxr_comment">// {@link ResourceLoader} requires, that the return-value is neve {@code null}.</em>
  92 <a class="jxr_linenumber" name="L84" href="#L84">84</a>      <em class="jxr_comment">// Therefore, we fall back to the behaviour of our parent-loader.</em>
  93 <a class="jxr_linenumber" name="L85" href="#L85">85</a>      <strong class="jxr_keyword">return</strong> loader.getResource(location);
  94 <a class="jxr_linenumber" name="L86" href="#L86">86</a>    }
  95 <a class="jxr_linenumber" name="L87" href="#L87">87</a>
  96 <a class="jxr_linenumber" name="L88" href="#L88">88</a>    @Override
  97 <a class="jxr_linenumber" name="L89" href="#L89">89</a>    <strong class="jxr_keyword">public</strong> ClassLoader getClassLoader()
  98 <a class="jxr_linenumber" name="L90" href="#L90">90</a>    {
  99 <a class="jxr_linenumber" name="L91" href="#L91">91</a>      <strong class="jxr_keyword">return</strong> loader.getClassLoader();
 100 <a class="jxr_linenumber" name="L92" href="#L92">92</a>    }
 101 <a class="jxr_linenumber" name="L93" href="#L93">93</a>  }
 102 </pre>
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