classicscope.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="116" href="#116">116</a> <em>     * @param o</em>
<a name="117" href="#117">117</a> <em>     *            Object to test.</em>
<a name="118" href="#118">118</a> <em>     * @return Whether the given object (typically a CandidateURI) falls within</em>
<a name="119" href="#119">119</a> <em>     *         this scope.</em>
<a name="120" href="#120">120</a> <em>     */</em>
<a name="121" href="#121">121</a>     <strong>protected</strong> <strong>final</strong> <strong>boolean</strong> innerAccepts(Object o) {
<a name="122" href="#122">122</a>         <strong>return</strong> forceAccepts(o) || (((isSeed(o) || focusAccepts(o)) ||
<a name="123" href="#123">123</a>             additionalFocusAccepts(o) || transitiveAccepts(o)) &amp;&amp;
<a name="124" href="#124">124</a>             !excludeAccepts(o));
<a name="125" href="#125">125</a>     }
<a name="126" href="#126">126</a> 
<a name="127" href="#127">127</a>     <em>/**<em>*</em></em>
<a name="128" href="#128">128</a> <em>     * Check if URI is accepted by the additional focus of this scope.</em>
<a name="129" href="#129">129</a> <em>     * </em>
<a name="130" href="#130">130</a> <em>     * This method should be overridden in subclasses.</em>
<a name="131" href="#131">131</a> <em>     * </em>
<a name="132" href="#132">132</a> <em>     * @param o</em>
<a name="133" href="#133">133</a> <em>     *            the URI to check.</em>
<a name="134" href="#134">134</a> <em>     * @return True if additional focus filter accepts passed object.</em>
<a name="135" href="#135">135</a> <em>     */</em>
<a name="136" href="#136">136</a>     <strong>protected</strong> <strong>boolean</strong> additionalFocusAccepts(Object o) {
<a name="137" href="#137">137</a>         <strong>return</strong> false;
<a name="138" href="#138">138</a>     }
<a name="139" href="#139">139</a> 
<a name="140" href="#140">140</a>     <em>/**<em>*</em></em>
<a name="141" href="#141">141</a> <em>     * @param o</em>
<a name="142" href="#142">142</a> <em>     *            the URI to check.</em>
<a name="143" href="#143">143</a> <em>     * @return True if transitive filter accepts passed object.</em>
<a name="144" href="#144">144</a> <em>     */</em>
<a name="145" href="#145">145</a>     <strong>protected</strong> <strong>boolean</strong> transitiveAccepts(Object o) {
<a name="146" href="#146">146</a>         <strong>return</strong> false;
<a name="147" href="#147">147</a>     }
<a name="148" href="#148">148</a> 
<a name="149" href="#149">149</a>     <em>/**<em>*</em></em>
<a name="150" href="#150">150</a> <em>     * @param o the URI to check.</em>
<a name="151" href="#151">151</a> <em>     * @return True if force-accepts filter accepts passed object.</em>
<a name="152" href="#152">152</a> <em>     */</em>
<a name="153" href="#153">153</a>     <strong>protected</strong> <strong>boolean</strong> forceAccepts(Object o) {
<a name="154" href="#154">154</a>         <strong>return</strong> false;
<a name="155" href="#155">155</a>     }
<a name="156" href="#156">156</a>     
<a name="157" href="#157">157</a>     <em>/**<em>*</em></em>
<a name="158" href="#158">158</a> <em>     * Check if URI is accepted by the focus of this scope.</em>
<a name="159" href="#159">159</a> <em>     * </em>
<a name="160" href="#160">160</a> <em>     * This method should be overridden in subclasses.</em>
<a name="161" href="#161">161</a> <em>     * </em>
<a name="162" href="#162">162</a> <em>     * @param o</em>
<a name="163" href="#163">163</a> <em>     *            the URI to check.</em>
<a name="164" href="#164">164</a> <em>     * @return True if focus filter accepts passed object.</em>
<a name="165" href="#165">165</a> <em>     */</em>
<a name="166" href="#166">166</a>     <strong>protected</strong> <strong>boolean</strong> focusAccepts(Object o) {
<a name="167" href="#167">167</a>         <em class="comment">// The CrawlScope doesn't accept any URIs</em>
<a name="168" href="#168">168</a>         <strong>return</strong> false;
<a name="169" href="#169">169</a>     }
<a name="170" href="#170">170</a> 
<a name="171" href="#171">171</a>     <em>/**<em>*</em></em>
<a name="172" href="#172">172</a> <em>     * Check if URI is excluded by any filters.</em>
<a name="173" href="#173">173</a> <em>     * </em>
<a name="174" href="#174">174</a> <em>     * @param o</em>
<a name="175" href="#175">175</a> <em>     *            the URI to check.</em>
<a name="176" href="#176">176</a> <em>     * @return True if exclude filter accepts passed object.</em>
<a name="177" href="#177">177</a> <em>     */</em>
<a name="178" href="#178">178</a>     <strong>protected</strong> <strong>boolean</strong> excludeAccepts(Object o) {
<a name="179" href="#179">179</a>         <strong>return</strong> (<strong>this</strong>.excludeFilter.isEmpty(o)) ? exceedsMaxHops(o)
<a name="180" href="#180">180</a>                 : <strong>this</strong>.excludeFilter.accepts(o) || exceedsMaxHops(o);
<a name="181" href="#181">181</a>     }
<a name="182" href="#182">182</a> 
<a name="183" href="#183">183</a>     <em>/**<em>*</em></em>
<a name="184" href="#184">184</a> <em>     * Check if there are too many hops</em>
<a name="185" href="#185">185</a> <em>     * </em>
<a name="186" href="#186">186</a> <em>     * @param o</em>
<a name="187" href="#187">187</a> <em>     *            URI to check.</em>
<a name="188" href="#188">188</a> <em>     * @return true if too many hops.</em>
<a name="189" href="#189">189</a> <em>     */</em>
<a name="190" href="#190">190</a>     <strong>protected</strong> <strong>boolean</strong> exceedsMaxHops(Object o) {
<a name="191" href="#191">191</a>         <strong>if</strong> (!(o instanceof CandidateURI)) {
<a name="192" href="#192">192</a>             <strong>return</strong> false;
<a name="193" href="#193">193</a>         }
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>         <strong>int</strong> maxLinkHops = 0;
<a name="196" href="#196">196</a>         <strong>int</strong> maxTransHops = 0;
<a name="197" href="#197">197</a> 
<a name="198" href="#198">198</a>         <strong>try</strong> {
<a name="199" href="#199">199</a>             maxLinkHops = ((Integer) getAttribute(o, ATTR_MAX_LINK_HOPS))
<a name="200" href="#200">200</a>                     .intValue();
<a name="201" href="#201">201</a>             maxTransHops = ((Integer) getAttribute(o, ATTR_MAX_TRANS_HOPS))
<a name="202" href="#202">202</a>                     .intValue();
<a name="203" href="#203">203</a>         } <strong>catch</strong> (AttributeNotFoundException e) {
<a name="204" href="#204">204</a>             <em class="comment">// TODO Auto-generated catch block</em>
<a name="205" href="#205">205</a>             e.printStackTrace();
<a name="206" href="#206">206</a>         }
<a name="207" href="#207">207</a> 
<a name="208" href="#208">208</a>         <a href="../../../../org/archive/crawler/datamodel/CandidateURI.html">CandidateURI</a> cand = (CandidateURI) o;
<a name="209" href="#209">209</a> 
<a name="210" href="#210">210</a>         String path = cand.getPathFromSeed();
<a name="211" href="#211">211</a>         <strong>int</strong> linkCount = 0;
<a name="212" href="#212">212</a>         <strong>int</strong> transCount = 0;
<a name="213" href="#213">213</a>         <strong>for</strong> (<strong>int</strong> i = path.length() - 1; i >= 0; i--) {
<a name="214" href="#214">214</a>             <strong>if</strong> (path.charAt(i) == Link.NAVLINK_HOP) {
<a name="215" href="#215">215</a>                 linkCount++;
<a name="216" href="#216">216</a>             } <strong>else</strong> <strong>if</strong> (linkCount == 0) {
<a name="217" href="#217">217</a>                 transCount++;
<a name="218" href="#218">218</a>             }
<a name="219" href="#219">219</a>         }
<a name="220" href="#220">220</a> <em class="comment">//      return (linkCount > maxLinkHops) || (transCount > maxTransHops);</em>
<a name="221" href="#221">221</a>         <em class="comment">// base only on links, don't treat trans count as hard max</em>
<a name="222" href="#222">222</a>         <strong>return</strong> (linkCount > maxLinkHops);
<a name="223" href="#223">223</a>     }
<a name="224" href="#224">224</a> 
<a name="225" href="#225">225</a>     <em>/**<em>*</em></em>
<a name="226" href="#226">226</a> <em>     * Take note of a situation (such as settings edit) where involved</em>
<a name="227" href="#227">227</a> <em>     * reconfiguration (such as reading from external files) may be necessary.</em>
<a name="228" href="#228">228</a> <em>     */</em>
<a name="229" href="#229">229</a>     <strong>public</strong> <strong>void</strong> kickUpdate() {
<a name="230" href="#230">230</a>         <strong>super</strong>.kickUpdate();
<a name="231" href="#231">231</a>         excludeFilter.kickUpdate();
<a name="232" href="#232">232</a>     }
<a name="233" href="#233">233</a> }
</pre>
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