filepatternfilter.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="87" href="#87">87</a>          addElementToDefinition(
<a name="88" href="#88">88</a>              <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_USE_DEFAULT, <span class="string">"URLs that match selected file "</span> +
<a name="89" href="#89">89</a>                  <span class="string">"patterns will be crawled. Default file patterns are:\n"</span> +
<a name="90" href="#90">90</a>                  <span class="string">"Images: .bmp, .gif, .jp(e)g, .png, .tif(f)\nAudio: .mid, "</span> +
<a name="91" href="#91">91</a>                  <span class="string">".mp2, .mp3, .mp4, .wav\nVideo: .avi, .mov, .mpeg, .ram, "</span> +
<a name="92" href="#92">92</a>                  <span class="string">".rm, .smil, .wmv\nMiscellaneous: .doc, .pdf, .ppt, .swf\n"</span> +
<a name="93" href="#93">93</a>                  <span class="string">"All: All above patterns\nChoose 'Custom' to specify your own"</span> +
<a name="94" href="#94">94</a>                  <span class="string">" pattern. These default patterns are case insensitive."</span>,
<a name="95" href="#95">95</a>                  <span class="string">"All"</span>, options));
<a name="96" href="#96">96</a>  
<a name="97" href="#97">97</a>          addElementToDefinition(
<a name="98" href="#98">98</a>              <strong>new</strong> <a href="../../../../org/archive/crawler/settings/SimpleType.html">SimpleType</a>(ATTR_REGEXP, <span class="string">"Custom java regular expression.+n "</span> +
<a name="99" href="#99">99</a>                      <span class="string">"This regular expression will be used instead of the "</span> +
<a name="100" href="#100">100</a>                     <span class="string">"supplied pattern groups for matching.\nAn example "</span> +
<a name="101" href="#101">101</a>                     <span class="string">"of such a regular expression (Miscellaneous):\n"</span> +
<a name="102" href="#102">102</a>                     <span class="string">".*(?i)(&#47;&#47;.(doc|pdf|ppt|swf))$\n"</span> +
<a name="103" href="#103">103</a>                     <span class="string">"Any arbitrary reg.expr. is valid though and will be "</span> +
<a name="104" href="#104">104</a>                     <span class="string">"applied to the URI."</span>, <span class="string">""</span>));
<a name="105" href="#105">105</a> 
<a name="106" href="#106">106</a> 
<a name="107" href="#107">107</a>     }
<a name="108" href="#108">108</a> 
<a name="109" href="#109">109</a>     <em>/**<em>*</em></em>
<a name="110" href="#110">110</a> <em>     * @see org.archive.crawler.filter.URIRegExpFilter#getRegexp(java.lang.Object)</em>
<a name="111" href="#111">111</a> <em>     */</em>
<a name="112" href="#112">112</a>     <strong>protected</strong> String getRegexp(Object o) {
<a name="113" href="#113">113</a>         <strong>try</strong> {
<a name="114" href="#114">114</a>             String patternType = (String)getAttribute(o, ATTR_USE_DEFAULT);
<a name="115" href="#115">115</a> 
<a name="116" href="#116">116</a>             <strong>if</strong> (patternType.equals(ALL)) {
<a name="117" href="#117">117</a>                 <strong>return</strong> ALL_DEFAULT_PATTERNS;
<a name="118" href="#118">118</a>             } <strong>else</strong> <strong>if</strong> (patternType.equals(IMAGES)) {
<a name="119" href="#119">119</a>                 <strong>return</strong> IMAGES_PATTERNS;
<a name="120" href="#120">120</a>             }<strong>else</strong> <strong>if</strong> (patternType.equals(AUDIO)) {
<a name="121" href="#121">121</a>                 <strong>return</strong> AUDIO_PATTERNS;
<a name="122" href="#122">122</a>             }<strong>else</strong> <strong>if</strong>(patternType.equals(VIDEO)) {
<a name="123" href="#123">123</a>                 <strong>return</strong> VIDEO_PATTERNS;
<a name="124" href="#124">124</a>             }<strong>else</strong> <strong>if</strong>(patternType.equals(MISC)) {
<a name="125" href="#125">125</a>                 <strong>return</strong> MISC_PATTERNS;
<a name="126" href="#126">126</a>             }<strong>else</strong> <strong>if</strong>(patternType.equals(CUSTOM)) {
<a name="127" href="#127">127</a>                 <strong>return</strong> (String) getAttribute(o, ATTR_REGEXP);
<a name="128" href="#128">128</a>             }<strong>else</strong> {
<a name="129" href="#129">129</a>                 assert false : <span class="string">"Unrecognized pattern type "</span> + patternType +
<a name="130" href="#130">130</a>                                <span class="string">". Should never happened!"</span>;
<a name="131" href="#131">131</a>             }
<a name="132" href="#132">132</a> 
<a name="133" href="#133">133</a>         } <strong>catch</strong> (AttributeNotFoundException e) {
<a name="134" href="#134">134</a>             logger.log(Level.SEVERE,<span class="string">"necessary setting missing"</span>,e);
<a name="135" href="#135">135</a>         }
<a name="136" href="#136">136</a>         <em class="comment">// Basically the filter is inactive if this occurs (The caller</em>
<a name="137" href="#137">137</a>         <em class="comment">// returns 'false' when regexp is null).</em>
<a name="138" href="#138">138</a>         <strong>return</strong> <strong>null</strong>;  
<a name="139" href="#139">139</a>     }
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>     <em>/**<em>*</em></em>
<a name="142" href="#142">142</a> <em>     * @see org.archive.crawler.framework.Filter#accepts(java.lang.Object)</em>
<a name="143" href="#143">143</a> <em>     */</em>
<a name="144" href="#144">144</a>     <strong>public</strong> <strong>boolean</strong> accepts(Object o) {
<a name="145" href="#145">145</a>         <a href="../../../../org/archive/crawler/datamodel/CrawlURI.html">CrawlURI</a> curi = (o instanceof CrawlURI) ? (CrawlURI) o : <strong>null</strong>;
<a name="146" href="#146">146</a> 
<a name="147" href="#147">147</a>         <em class="comment">// Skip the evaluation if the filter is disabled.</em>
<a name="148" href="#148">148</a>         <em class="comment">// Since this filter is primarily used with seed and focus filters</em>
<a name="149" href="#149">149</a>         <em class="comment">// it has to return false when disabled -- unlike Filter's accepts</em>
<a name="150" href="#150">150</a>         <em class="comment">// method.</em>
<a name="151" href="#151">151</a>         <strong>try</strong> {
<a name="152" href="#152">152</a>             <strong>if</strong> (!((Boolean) getAttribute(ATTR_ENABLED, curi)).booleanValue()) {
<a name="153" href="#153">153</a>                 <strong>return</strong> false;
<a name="154" href="#154">154</a>             }
<a name="155" href="#155">155</a>         } <strong>catch</strong> (AttributeNotFoundException e) {
<a name="156" href="#156">156</a>             logger.severe(e.getMessage());
<a name="157" href="#157">157</a>         }
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a>         <strong>boolean</strong> accept = returnTrueIfMatches(curi) == innerAccepts(o);
<a name="160" href="#160">160</a> 
<a name="161" href="#161">161</a>         <strong>if</strong> (accept &amp;&amp; logger.isLoggable(Level.FINEST)) {
<a name="162" href="#162">162</a>             <em class="comment">// Log if filter returns true</em>
<a name="163" href="#163">163</a>             <a href="../../../../org/archive/crawler/settings/ComplexType.html">ComplexType</a> p = <strong>this</strong>.getParent();
<a name="164" href="#164">164</a>             <strong>if</strong> (p instanceof MapType) {
<a name="165" href="#165">165</a>                 p = p.getParent();
<a name="166" href="#166">166</a>             }
<a name="167" href="#167">167</a>             String msg = <strong>this</strong>.toString() + <span class="string">" belonging to "</span> + p.toString()
<a name="168" href="#168">168</a>                          + <span class="string">" accepted "</span> + o.toString();
<a name="169" href="#169">169</a>             logger.finest(msg);
<a name="170" href="#170">170</a>         }
<a name="171" href="#171">171</a> 
<a name="172" href="#172">172</a>         <strong>return</strong> accept;
<a name="173" href="#173">173</a>     }
<a name="174" href="#174">174</a> 
<a name="175" href="#175">175</a> }
</pre>
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