cloneablebean.html

解析RSS工具源码

<a name="135" href="#135">135</a>                         !_ignoreProperties.contains(pds[i].getName()) &amp;&amp; <em class="comment">// is not in the list of properties to ignore</em>
<a name="136" href="#136">136</a>                         pReadMethod.getDeclaringClass()!=Object.<strong>class</strong> &amp;&amp; <em class="comment">// filter Object.class getter methods</em>
<a name="137" href="#137">137</a>                         pReadMethod.getParameterTypes().length==0) {     <em class="comment">// filter getter methods that take parameters</em>
<a name="138" href="#138">138</a>                         Object value = pReadMethod.invoke(_obj,NO_PARAMS);
<a name="139" href="#139">139</a>                         <strong>if</strong> (value!=<strong>null</strong>) {
<a name="140" href="#140">140</a>                             value = doClone(value);
<a name="141" href="#141">141</a>                             pWriteMethod.invoke(clonedBean,<strong>new</strong> Object[]{value});
<a name="142" href="#142">142</a>                         }
<a name="143" href="#143">143</a>                     }
<a name="144" href="#144">144</a>                 }
<a name="145" href="#145">145</a>             }
<a name="146" href="#146">146</a>         }
<a name="147" href="#147">147</a>         <strong>catch</strong> (CloneNotSupportedException cnsEx) {
<a name="148" href="#148">148</a>             <strong>throw</strong> cnsEx;
<a name="149" href="#149">149</a>         }
<a name="150" href="#150">150</a>         <strong>catch</strong> (Exception ex) {
<a name="151" href="#151">151</a>             System.out.println(ex);
<a name="152" href="#152">152</a>             ex.printStackTrace(System.out);
<a name="153" href="#153">153</a>             <strong>throw</strong> <strong>new</strong> CloneNotSupportedException(<span class="string">"Cannot clone a "</span>+_obj.getClass()+<span class="string">" object"</span>);
<a name="154" href="#154">154</a>         }
<a name="155" href="#155">155</a>         <strong>return</strong> clonedBean;
<a name="156" href="#156">156</a>     }
<a name="157" href="#157">157</a> 
<a name="158" href="#158">158</a>     <strong>private</strong> Object doClone(Object value) throws Exception {
<a name="159" href="#159">159</a>         <strong>if</strong> (value!=<strong>null</strong>) {
<a name="160" href="#160">160</a>             Class vClass = value.getClass();
<a name="161" href="#161">161</a>             <strong>if</strong> (vClass.isArray()) {
<a name="162" href="#162">162</a>                 value = cloneArray(value);
<a name="163" href="#163">163</a>             }
<a name="164" href="#164">164</a>             <strong>else</strong>
<a name="165" href="#165">165</a>             <strong>if</strong> (value instanceof Collection) {
<a name="166" href="#166">166</a>                 value = cloneCollection((Collection)value);
<a name="167" href="#167">167</a>             }
<a name="168" href="#168">168</a>             <strong>else</strong>
<a name="169" href="#169">169</a>             <strong>if</strong> (value instanceof Map) {
<a name="170" href="#170">170</a>                 value = cloneMap((Map)value);
<a name="171" href="#171">171</a>             }
<a name="172" href="#172">172</a>             <strong>else</strong>
<a name="173" href="#173">173</a>             <strong>if</strong> (isBasicType(vClass)) {
<a name="174" href="#174">174</a>                 <em class="comment">// NOTHING SPECIAL TO DO HERE, THEY ARE INMUTABLE</em>
<a name="175" href="#175">175</a>             }
<a name="176" href="#176">176</a>             <strong>else</strong>
<a name="177" href="#177">177</a>             <strong>if</strong> (value instanceof Cloneable) {
<a name="178" href="#178">178</a>                 Method cloneMethod = vClass.getMethod(<span class="string">"clone"</span>,NO_PARAMS_DEF);
<a name="179" href="#179">179</a>                 <strong>if</strong> (Mod<strong>if</strong>ier.isPublic(cloneMethod.getMod<strong>if</strong>iers())) {
<a name="180" href="#180">180</a>                    value = cloneMethod.invoke(value,NO_PARAMS);
<a name="181" href="#181">181</a>                 }
<a name="182" href="#182">182</a>                 <strong>else</strong> {
<a name="183" href="#183">183</a>                     <strong>throw</strong> <strong>new</strong> CloneNotSupportedException(<span class="string">"Cannot clone a "</span>+value.getClass()+<span class="string">" object, clone() is not public"</span>);
<a name="184" href="#184">184</a>                 }
<a name="185" href="#185">185</a>             }
<a name="186" href="#186">186</a>             <strong>else</strong> {
<a name="187" href="#187">187</a>                 <strong>throw</strong> <strong>new</strong> CloneNotSupportedException(<span class="string">"Cannot clone a "</span>+vClass.getName()+<span class="string">" object"</span>);
<a name="188" href="#188">188</a>             }
<a name="189" href="#189">189</a>         }
<a name="190" href="#190">190</a>         <strong>return</strong> value;
<a name="191" href="#191">191</a>     }
<a name="192" href="#192">192</a> 
<a name="193" href="#193">193</a>     <strong>private</strong> Object cloneArray(Object array) throws Exception {
<a name="194" href="#194">194</a>         Class elementClass = array.getClass().getComponentType();
<a name="195" href="#195">195</a>         <strong>int</strong> length = Array.getLength(array);
<a name="196" href="#196">196</a>         Object newArray = Array.newInstance(elementClass,length);
<a name="197" href="#197">197</a>         <strong>for</strong> (<strong>int</strong> i=0;i&lt;length;i++) {
<a name="198" href="#198">198</a>             Object element = doClone(Array.get(array,i));
<a name="199" href="#199">199</a>             Array.set(newArray,i,element);
<a name="200" href="#200">200</a>         }
<a name="201" href="#201">201</a>         <strong>return</strong> newArray;
<a name="202" href="#202">202</a>     }
<a name="203" href="#203">203</a> 
<a name="204" href="#204">204</a>     <strong>private</strong> Object cloneCollection(Collection collection) throws Exception {
<a name="205" href="#205">205</a>         Class mClass = collection.getClass();
<a name="206" href="#206">206</a>         Collection newColl = (Collection) mClass.newInstance();
<a name="207" href="#207">207</a>         Iterator i = collection.iterator();
<a name="208" href="#208">208</a>         <strong>while</strong> (i.hasNext()) {
<a name="209" href="#209">209</a>             Object element = doClone(i.next());
<a name="210" href="#210">210</a>             newColl.add(element);
<a name="211" href="#211">211</a>         }
<a name="212" href="#212">212</a>         <strong>return</strong> newColl;
<a name="213" href="#213">213</a>     }
<a name="214" href="#214">214</a> 
<a name="215" href="#215">215</a>     <strong>private</strong> Object cloneMap(Map map) throws Exception {
<a name="216" href="#216">216</a>         Class mClass = map.getClass();
<a name="217" href="#217">217</a>         Map newMap = (Map) mClass.newInstance();
<a name="218" href="#218">218</a>         Iterator entries = map.entrySet().iterator();
<a name="219" href="#219">219</a>         <strong>while</strong> (entries.hasNext()) {
<a name="220" href="#220">220</a>             Map.Entry entry = (Map.Entry) entries.next();
<a name="221" href="#221">221</a>             Object key = doClone(entry.getKey());
<a name="222" href="#222">222</a>             Object value = doClone(entry.getValue());
<a name="223" href="#223">223</a>             newMap.put(key,value);
<a name="224" href="#224">224</a>         }
<a name="225" href="#225">225</a>         <strong>return</strong> newMap;
<a name="226" href="#226">226</a>     }
<a name="227" href="#227">227</a> 
<a name="228" href="#228">228</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> Set BASIC_TYPES = <strong>new</strong> HashSet();
<a name="229" href="#229">229</a> 
<a name="230" href="#230">230</a>     <strong>static</strong> {
<a name="231" href="#231">231</a>         BASIC_TYPES.add(Boolean.<strong>class</strong>);
<a name="232" href="#232">232</a>         BASIC_TYPES.add(Byte.<strong>class</strong>);
<a name="233" href="#233">233</a>         BASIC_TYPES.add(Character.<strong>class</strong>);
<a name="234" href="#234">234</a>         BASIC_TYPES.add(Double.<strong>class</strong>);
<a name="235" href="#235">235</a>         BASIC_TYPES.add(Float.<strong>class</strong>);
<a name="236" href="#236">236</a>         BASIC_TYPES.add(Integer.<strong>class</strong>);
<a name="237" href="#237">237</a>         BASIC_TYPES.add(Long.<strong>class</strong>);
<a name="238" href="#238">238</a>         BASIC_TYPES.add(Short.<strong>class</strong>);
<a name="239" href="#239">239</a>         BASIC_TYPES.add(String.<strong>class</strong>);
<a name="240" href="#240">240</a>     }
<a name="241" href="#241">241</a> 
<a name="242" href="#242">242</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> Map CONSTRUCTOR_BASIC_TYPES = <strong>new</strong> HashMap();
<a name="243" href="#243">243</a> 
<a name="244" href="#244">244</a>     <strong>static</strong> {
<a name="245" href="#245">245</a>         CONSTRUCTOR_BASIC_TYPES.put(Boolean.<strong>class</strong>,<strong>new</strong> Class[]{Boolean.TYPE});
<a name="246" href="#246">246</a>         CONSTRUCTOR_BASIC_TYPES.put(Byte.<strong>class</strong>,<strong>new</strong> Class[]{Byte.TYPE});
<a name="247" href="#247">247</a>         CONSTRUCTOR_BASIC_TYPES.put(Character.<strong>class</strong>,<strong>new</strong> Class[]{Character.TYPE});
<a name="248" href="#248">248</a>         CONSTRUCTOR_BASIC_TYPES.put(Double.<strong>class</strong>,<strong>new</strong> Class[]{Double.TYPE});
<a name="249" href="#249">249</a>         CONSTRUCTOR_BASIC_TYPES.put(Float.<strong>class</strong>,<strong>new</strong> Class[]{Float.TYPE});
<a name="250" href="#250">250</a>         CONSTRUCTOR_BASIC_TYPES.put(Integer.<strong>class</strong>,<strong>new</strong> Class[]{Integer.TYPE});
<a name="251" href="#251">251</a>         CONSTRUCTOR_BASIC_TYPES.put(Long.<strong>class</strong>,<strong>new</strong> Class[]{Long.TYPE});
<a name="252" href="#252">252</a>         CONSTRUCTOR_BASIC_TYPES.put(Short.<strong>class</strong>,<strong>new</strong> Class[]{Short.TYPE});
<a name="253" href="#253">253</a>         CONSTRUCTOR_BASIC_TYPES.put(String.<strong>class</strong>,<strong>new</strong> Class[]{String.<strong>class</strong>});
<a name="254" href="#254">254</a>     }
<a name="255" href="#255">255</a> 
<a name="256" href="#256">256</a>     <strong>private</strong> <strong>boolean</strong> isBasicType(Class vClass) {
<a name="257" href="#257">257</a>         <strong>return</strong> BASIC_TYPES.contains(vClass);
<a name="258" href="#258">258</a>     }
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a>     <em class="comment">// THIS IS NOT NEEDED, BASIC TYPES  ARE INMUTABLE, TUCU 20040710</em>
<a name="261" href="#261">261</a>     <em>/**<em>*</em></em>
<a name="262" href="#262">262</a> <em>    private Object cloneBasicType(Object value) throws Exception {</em>
<a name="263" href="#263">263</a> <em>        Class pClass = value.getClass();</em>
<a name="264" href="#264">264</a> <em>        Class[] defType = (Class[]) CONSTRUCTOR_BASIC_TYPES.get(pClass);</em>
<a name="265" href="#265">265</a> <em>        Constructor cons = pClass.getDeclaredConstructor(defType);</em>
<a name="266" href="#266">266</a> <em>        value = cons.newInstance(new Object[]{value});</em>
<a name="267" href="#267">267</a> <em>        return value;</em>
<a name="268" href="#268">268</a> <em>    }</em>
<a name="269" href="#269">269</a> <em>    **/</em>
<a name="270" href="#270">270</a> 
<a name="271" href="#271">271</a> }
<a name="272" href="#272">272</a> 
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