charsequencelinkextractor.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="97" href="#97">97</a>      <strong>public</strong> <a href="../../../org/archive/crawler/extractor/Link.html">Link</a> nextLink() {
<a name="98" href="#98">98</a>          <strong>if</strong>(!hasNext()) {
<a name="99" href="#99">99</a>              <strong>throw</strong> <strong>new</strong> NoSuchElementException();
<a name="100" href="#100">100</a>         }
<a name="101" href="#101">101</a>         <em class="comment">// next will have been filled with at least one item</em>
<a name="102" href="#102">102</a>         <strong>return</strong> (Link) next.removeFirst();
<a name="103" href="#103">103</a>     }
<a name="104" href="#104">104</a> 
<a name="105" href="#105">105</a>     <em>/**<em>*</em></em>
<a name="106" href="#106">106</a> <em>     * Discard all state. Another setup() is required to use again.</em>
<a name="107" href="#107">107</a> <em>     */</em>
<a name="108" href="#108">108</a>     <strong>public</strong> <strong>void</strong> reset() {
<a name="109" href="#109">109</a>         base = <strong>null</strong>;
<a name="110" href="#110">110</a>         source = <strong>null</strong>;
<a name="111" href="#111">111</a>         sourceContent = <strong>null</strong>; <em class="comment">// TODO: discard other resources</em>
<a name="112" href="#112">112</a>     }
<a name="113" href="#113">113</a> 
<a name="114" href="#114">114</a>     <em class="comment">/*<em class="comment"> (non-Javadoc)</em></em>
<a name="115" href="#115">115</a> <em class="comment">     * @see java.util.Iterator#hasNext()</em>
<a name="116" href="#116">116</a> <em class="comment">     */</em>
<a name="117" href="#117">117</a>     <strong>public</strong> <strong>boolean</strong> hasNext() {
<a name="118" href="#118">118</a>         <strong>if</strong> (!next.isEmpty()) {
<a name="119" href="#119">119</a>             <strong>return</strong> <strong>true</strong>;
<a name="120" href="#120">120</a>         }
<a name="121" href="#121">121</a>         <strong>return</strong> findNextLink();
<a name="122" href="#122">122</a>     }
<a name="123" href="#123">123</a> 
<a name="124" href="#124">124</a>     <em>/**<em>*</em></em>
<a name="125" href="#125">125</a> <em>     * Scan to the next link(s), if any, loading it into the next buffer.</em>
<a name="126" href="#126">126</a> <em>     *</em>
<a name="127" href="#127">127</a> <em>     * @return true if any links are found/available, false otherwise</em>
<a name="128" href="#128">128</a> <em>     */</em>
<a name="129" href="#129">129</a>     <strong>abstract</strong> <strong>protected</strong> <strong>boolean</strong> findNextLink();
<a name="130" href="#130">130</a> 
<a name="131" href="#131">131</a>     <em class="comment">/*<em class="comment"> (non-Javadoc)</em></em>
<a name="132" href="#132">132</a> <em class="comment">     * @see java.util.Iterator#next()</em>
<a name="133" href="#133">133</a> <em class="comment">     */</em>
<a name="134" href="#134">134</a>     <strong>public</strong> Object next() {
<a name="135" href="#135">135</a>         <strong>return</strong> nextLink();
<a name="136" href="#136">136</a>     }
<a name="137" href="#137">137</a> 
<a name="138" href="#138">138</a>     <em class="comment">/*<em class="comment"> (non-Javadoc)</em></em>
<a name="139" href="#139">139</a> <em class="comment">     * @see java.util.Iterator#remove()</em>
<a name="140" href="#140">140</a> <em class="comment">     */</em>
<a name="141" href="#141">141</a>     <strong>public</strong> <strong>void</strong> remove() {
<a name="142" href="#142">142</a>         <strong>throw</strong> <strong>new</strong> UnsupportedOperationException();
<a name="143" href="#143">143</a>     }
<a name="144" href="#144">144</a> 
<a name="145" href="#145">145</a>     <em>/**<em>*</em></em>
<a name="146" href="#146">146</a> <em>     * @param content</em>
<a name="147" href="#147">147</a> <em>     * @param charset</em>
<a name="148" href="#148">148</a> <em>     * @return CharSequence obtained from stream in given charset</em>
<a name="149" href="#149">149</a> <em>     */</em>
<a name="150" href="#150">150</a>     <strong>protected</strong> CharSequence charSequenceFrom(InputStream content, Charset charset) {
<a name="151" href="#151">151</a>         <em class="comment">// See if content InputStream can provide</em>
<a name="152" href="#152">152</a>         <strong>if</strong>(content instanceof <a href="../../../org/archive/extractor/CharSequenceProvider.html">CharSequenceProvider</a>) {
<a name="153" href="#153">153</a>             <strong>return</strong> ((CharSequenceProvider)content).getCharSequence();
<a name="154" href="#154">154</a>         }
<a name="155" href="#155">155</a>         <em class="comment">// otherwise, create one</em>
<a name="156" href="#156">156</a>         <strong>return</strong> createCharSequenceFrom(content, charset);
<a name="157" href="#157">157</a>     }
<a name="158" href="#158">158</a> 
<a name="159" href="#159">159</a>     <em>/**<em>*</em></em>
<a name="160" href="#160">160</a> <em>     * @param content</em>
<a name="161" href="#161">161</a> <em>     * @param charset</em>
<a name="162" href="#162">162</a> <em>     * @return CharSequence built over given stream in given charset</em>
<a name="163" href="#163">163</a> <em>     */</em>
<a name="164" href="#164">164</a>     <strong>protected</strong> CharSequence createCharSequenceFrom(InputStream content, Charset charset) {
<a name="165" href="#165">165</a>         <em class="comment">// TODO: implement</em>
<a name="166" href="#166">166</a>         <strong>return</strong> <strong>null</strong>;
<a name="167" href="#167">167</a>         <em class="comment">// TODO: consider cleanup in reset()</em>
<a name="168" href="#168">168</a>     }
<a name="169" href="#169">169</a> 
<a name="170" href="#170">170</a>     <em>/**<em>*</em></em>
<a name="171" href="#171">171</a> <em>     * Convenience method to do default extraction.</em>
<a name="172" href="#172">172</a> <em>     *</em>
<a name="173" href="#173">173</a> <em>     * @param content</em>
<a name="174" href="#174">174</a> <em>     * @param source</em>
<a name="175" href="#175">175</a> <em>     * @param base</em>
<a name="176" href="#176">176</a> <em>     * @param collector</em>
<a name="177" href="#177">177</a> <em>     * @param extractErrorListener</em>
<a name="178" href="#178">178</a> <em>     */</em>
<a name="179" href="#179">179</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> extract(CharSequence content, <a href="../../../org/archive/net/UURI.html">UURI</a> source, <a href="../../../org/archive/net/UURI.html">UURI</a> base,
<a name="180" href="#180">180</a>             List collector, <a href="../../../org/archive/extractor/ExtractErrorListener.html">ExtractErrorListener</a> extractErrorListener) {
<a name="181" href="#181">181</a>         <em class="comment">// TODO: arrange for inheritance of prefs... eg when HTML includes JS</em>
<a name="182" href="#182">182</a>         <em class="comment">// includes HTML, have inner HTML follow robots, etc from outer</em>
<a name="183" href="#183">183</a>         <a href="../../../org/archive/extractor/CharSequenceLinkExtractor.html">CharSequenceLinkExtractor</a> extractor = newDefaultInstance();
<a name="184" href="#184">184</a>         extractor.setup(source, base, content, extractErrorListener);
<a name="185" href="#185">185</a>         <strong>while</strong> (extractor.hasNext()) {
<a name="186" href="#186">186</a>             collector.add(extractor.nextLink());
<a name="187" href="#187">187</a>         }
<a name="188" href="#188">188</a>         extractor.reset();
<a name="189" href="#189">189</a>     }
<a name="190" href="#190">190</a> 
<a name="191" href="#191">191</a>     <strong>protected</strong> <strong>static</strong> <a href="../../../org/archive/extractor/CharSequenceLinkExtractor.html">CharSequenceLinkExtractor</a> newDefaultInstance() {
<a name="192" href="#192">192</a>         <em class="comment">// override in subclasses</em>
<a name="193" href="#193">193</a>         <strong>return</strong> <strong>null</strong>;
<a name="194" href="#194">194</a>     }
<a name="195" href="#195">195</a> }
</pre>
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