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| <a name="1" href="#1">1</a> <strong class="jxr_keyword">package</strong> org.apache.velocity.util.introspection; |
| <a name="2" href="#2">2</a> |
| <a name="3" href="#3">3</a> <em class="jxr_comment">/*</em> |
| <a name="4" href="#4">4</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one</em> |
| <a name="5" href="#5">5</a> <em class="jxr_comment"> * or more contributor license agreements. See the NOTICE file</em> |
| <a name="6" href="#6">6</a> <em class="jxr_comment"> * distributed with this work for additional information</em> |
| <a name="7" href="#7">7</a> <em class="jxr_comment"> * regarding copyright ownership. The ASF licenses this file</em> |
| <a name="8" href="#8">8</a> <em class="jxr_comment"> * to you under the Apache License, Version 2.0 (the</em> |
| <a name="9" href="#9">9</a> <em class="jxr_comment"> * "License"); you may not use this file except in compliance</em> |
| <a name="10" href="#10">10</a> <em class="jxr_comment"> * with the License. You may obtain a copy of the License at</em> |
| <a name="11" href="#11">11</a> <em class="jxr_comment"> *</em> |
| <a name="12" href="#12">12</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em> |
| <a name="13" href="#13">13</a> <em class="jxr_comment"> *</em> |
| <a name="14" href="#14">14</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing,</em> |
| <a name="15" href="#15">15</a> <em class="jxr_comment"> * software distributed under the License is distributed on an</em> |
| <a name="16" href="#16">16</a> <em class="jxr_comment"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em> |
| <a name="17" href="#17">17</a> <em class="jxr_comment"> * KIND, either express or implied. See the License for the</em> |
| <a name="18" href="#18">18</a> <em class="jxr_comment"> * specific language governing permissions and limitations</em> |
| <a name="19" href="#19">19</a> <em class="jxr_comment"> * under the License. </em> |
| <a name="20" href="#20">20</a> <em class="jxr_comment"> */</em> |
| <a name="21" href="#21">21</a> |
| <a name="22" href="#22">22</a> <strong class="jxr_keyword">import</strong> java.lang.reflect.Method; |
| <a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> java.util.ArrayList; |
| <a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> java.util.Hashtable; |
| <a name="25" href="#25">25</a> <strong class="jxr_keyword">import</strong> java.util.Iterator; |
| <a name="26" href="#26">26</a> <strong class="jxr_keyword">import</strong> java.util.LinkedList; |
| <a name="27" href="#27">27</a> <strong class="jxr_keyword">import</strong> java.util.List; |
| <a name="28" href="#28">28</a> <strong class="jxr_keyword">import</strong> java.util.Map; |
| <a name="29" href="#29">29</a> |
| <a name="30" href="#30">30</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:jvanzyl@apache.org" target="alexandria_uri">mailto:jvanzyl@apache.org</a>">Jason van Zyl</a></em> |
| <a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:bob@werken.com" target="alexandria_uri">mailto:bob@werken.com</a>">Bob McWhirter</a></em> |
| <a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:Christoph.Reck@dlr.de" target="alexandria_uri">mailto:Christoph.Reck@dlr.de</a>">Christoph Reck</a></em> |
| <a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:geirm@optonline.net" target="alexandria_uri">mailto:geirm@optonline.net</a>">Geir Magnusson Jr.</a></em> |
| <a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * @author <a href="<a href="mailto:szegedia@freemail.hu" target="alexandria_uri">mailto:szegedia@freemail.hu</a>">Attila Szegedi</a></em> |
| <a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> * @version $Id: MethodMap.java 476785 2006-11-19 10:06:21Z henning $</em> |
| <a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="39" href="#39">39</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/velocity/util/introspection/MethodMap.html">MethodMap</a> |
| <a name="40" href="#40">40</a> { |
| <a name="41" href="#41">41</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> MORE_SPECIFIC = 0; |
| <a name="42" href="#42">42</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> LESS_SPECIFIC = 1; |
| <a name="43" href="#43">43</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> INCOMPARABLE = 2; |
| <a name="44" href="#44">44</a> |
| <a name="45" href="#45">45</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="46" href="#46">46</a> <em class="jxr_javadoccomment"> * Keep track of all methods with the same name.</em> |
| <a name="47" href="#47">47</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="48" href="#48">48</a> Map methodByNameMap = <strong class="jxr_keyword">new</strong> Hashtable(); |
| <a name="49" href="#49">49</a> |
| <a name="50" href="#50">50</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="51" href="#51">51</a> <em class="jxr_javadoccomment"> * Add a method to a list of methods by name.</em> |
| <a name="52" href="#52">52</a> <em class="jxr_javadoccomment"> * For a particular class we are keeping track</em> |
| <a name="53" href="#53">53</a> <em class="jxr_javadoccomment"> * of all the methods with the same name.</em> |
| <a name="54" href="#54">54</a> <em class="jxr_javadoccomment"> * @param method</em> |
| <a name="55" href="#55">55</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="56" href="#56">56</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> add(Method method) |
| <a name="57" href="#57">57</a> { |
| <a name="58" href="#58">58</a> String methodName = method.getName(); |
| <a name="59" href="#59">59</a> |
| <a name="60" href="#60">60</a> List l = get( methodName ); |
| <a name="61" href="#61">61</a> |
| <a name="62" href="#62">62</a> <strong class="jxr_keyword">if</strong> ( l == <strong class="jxr_keyword">null</strong>) |
| <a name="63" href="#63">63</a> { |
| <a name="64" href="#64">64</a> l = <strong class="jxr_keyword">new</strong> ArrayList(); |
| <a name="65" href="#65">65</a> methodByNameMap.put(methodName, l); |
| <a name="66" href="#66">66</a> } |
| <a name="67" href="#67">67</a> |
| <a name="68" href="#68">68</a> l.add(method); |
| <a name="69" href="#69">69</a> } |
| <a name="70" href="#70">70</a> |
| <a name="71" href="#71">71</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="72" href="#72">72</a> <em class="jxr_javadoccomment"> * Return a list of methods with the same name.</em> |
| <a name="73" href="#73">73</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="74" href="#74">74</a> <em class="jxr_javadoccomment"> * @param key</em> |
| <a name="75" href="#75">75</a> <em class="jxr_javadoccomment"> * @return List list of methods</em> |
| <a name="76" href="#76">76</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="77" href="#77">77</a> <strong class="jxr_keyword">public</strong> List get(String key) |
| <a name="78" href="#78">78</a> { |
| <a name="79" href="#79">79</a> <strong class="jxr_keyword">return</strong> (List) methodByNameMap.get(key); |
| <a name="80" href="#80">80</a> } |
| <a name="81" href="#81">81</a> |
| <a name="82" href="#82">82</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="83" href="#83">83</a> <em class="jxr_javadoccomment"> * <p></em> |
| <a name="84" href="#84">84</a> <em class="jxr_javadoccomment"> * Find a method. Attempts to find the</em> |
| <a name="85" href="#85">85</a> <em class="jxr_javadoccomment"> * most specific applicable method using the</em> |
| <a name="86" href="#86">86</a> <em class="jxr_javadoccomment"> * algorithm described in the JLS section</em> |
| <a name="87" href="#87">87</a> <em class="jxr_javadoccomment"> * 15.12.2 (with the exception that it can't</em> |
| <a name="88" href="#88">88</a> <em class="jxr_javadoccomment"> * distinguish a primitive type argument from</em> |
| <a name="89" href="#89">89</a> <em class="jxr_javadoccomment"> * an object type argument, since in reflection</em> |
| <a name="90" href="#90">90</a> <em class="jxr_javadoccomment"> * primitive type arguments are represented by</em> |
| <a name="91" href="#91">91</a> <em class="jxr_javadoccomment"> * their object counterparts, so for an argument of</em> |
| <a name="92" href="#92">92</a> <em class="jxr_javadoccomment"> * type (say) java.lang.Integer, it will not be able</em> |
| <a name="93" href="#93">93</a> <em class="jxr_javadoccomment"> * to decide between a method that takes int and a</em> |
| <a name="94" href="#94">94</a> <em class="jxr_javadoccomment"> * method that takes java.lang.Integer as a parameter.</em> |
| <a name="95" href="#95">95</a> <em class="jxr_javadoccomment"> * </p></em> |
| <a name="96" href="#96">96</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="97" href="#97">97</a> <em class="jxr_javadoccomment"> * <p></em> |
| <a name="98" href="#98">98</a> <em class="jxr_javadoccomment"> * This turns out to be a relatively rare case</em> |
| <a name="99" href="#99">99</a> <em class="jxr_javadoccomment"> * where this is needed - however, functionality</em> |
| <a name="100" href="#100">100</a> <em class="jxr_javadoccomment"> * like this is needed.</em> |
| <a name="101" href="#101">101</a> <em class="jxr_javadoccomment"> * </p></em> |
| <a name="102" href="#102">102</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="103" href="#103">103</a> <em class="jxr_javadoccomment"> * @param methodName name of method</em> |
| <a name="104" href="#104">104</a> <em class="jxr_javadoccomment"> * @param args the actual arguments with which the method is called</em> |
| <a name="105" href="#105">105</a> <em class="jxr_javadoccomment"> * @return the most specific applicable method, or null if no</em> |
| <a name="106" href="#106">106</a> <em class="jxr_javadoccomment"> * method is applicable.</em> |
| <a name="107" href="#107">107</a> <em class="jxr_javadoccomment"> * @throws AmbiguousException if there is more than one maximally</em> |
| <a name="108" href="#108">108</a> <em class="jxr_javadoccomment"> * specific applicable method</em> |
| <a name="109" href="#109">109</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="110" href="#110">110</a> <strong class="jxr_keyword">public</strong> Method find(String methodName, Object[] args) |
| <a name="111" href="#111">111</a> <strong class="jxr_keyword">throws</strong> <a href="../../../../../org/apache/velocity/util/introspection/MethodMap.html">AmbiguousException</a> |
| <a name="112" href="#112">112</a> { |
| <a name="113" href="#113">113</a> List methodList = get(methodName); |
| <a name="114" href="#114">114</a> |
| <a name="115" href="#115">115</a> <strong class="jxr_keyword">if</strong> (methodList == <strong class="jxr_keyword">null</strong>) |
| <a name="116" href="#116">116</a> { |
| <a name="117" href="#117">117</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>; |
| <a name="118" href="#118">118</a> } |
| <a name="119" href="#119">119</a> |
| <a name="120" href="#120">120</a> <strong class="jxr_keyword">int</strong> l = args.length; |
| <a name="121" href="#121">121</a> Class[] classes = <strong class="jxr_keyword">new</strong> Class[l]; |
| <a name="122" href="#122">122</a> |
| <a name="123" href="#123">123</a> <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> i = 0; i < l; ++i) |
| <a name="124" href="#124">124</a> { |
| <a name="125" href="#125">125</a> Object arg = args[i]; |
| <a name="126" href="#126">126</a> |
| <a name="127" href="#127">127</a> <em class="jxr_comment">/*</em> |
| <a name="128" href="#128">128</a> <em class="jxr_comment"> * if we are careful down below, a null argument goes in there</em> |
| <a name="129" href="#129">129</a> <em class="jxr_comment"> * so we can know that the null was passed to the method</em> |
| <a name="130" href="#130">130</a> <em class="jxr_comment"> */</em> |
| <a name="131" href="#131">131</a> classes[i] = |
| <a name="132" href="#132">132</a> arg == <strong class="jxr_keyword">null</strong> ? <strong class="jxr_keyword">null</strong> : arg.getClass(); |
| <a name="133" href="#133">133</a> } |
| <a name="134" href="#134">134</a> |
| <a name="135" href="#135">135</a> <strong class="jxr_keyword">return</strong> getMostSpecific(methodList, classes); |
| <a name="136" href="#136">136</a> } |
| <a name="137" href="#137">137</a> |
| <a name="138" href="#138">138</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="139" href="#139">139</a> <em class="jxr_javadoccomment"> * Simple distinguishable exception, used when</em> |
| <a name="140" href="#140">140</a> <em class="jxr_javadoccomment"> * we run across ambiguous overloading. Caught</em> |
| <a name="141" href="#141">141</a> <em class="jxr_javadoccomment"> * by the introspector.</em> |
| <a name="142" href="#142">142</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="143" href="#143">143</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/velocity/util/introspection/MethodMap.html">AmbiguousException</a> <strong class="jxr_keyword">extends</strong> RuntimeException |
| <a name="144" href="#144">144</a> { |
| <a name="145" href="#145">145</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="146" href="#146">146</a> <em class="jxr_javadoccomment"> * Version Id for serializable</em> |
| <a name="147" href="#147">147</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="148" href="#148">148</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> serialVersionUID = -2314636505414551663L; |
| <a name="149" href="#149">149</a> } |
| <a name="150" href="#150">150</a> |
| <a name="151" href="#151">151</a> |
| <a name="152" href="#152">152</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Method getMostSpecific(List methods, Class[] classes) |
| <a name="153" href="#153">153</a> <strong class="jxr_keyword">throws</strong> <a href="../../../../../org/apache/velocity/util/introspection/MethodMap.html">AmbiguousException</a> |
| <a name="154" href="#154">154</a> { |
| <a name="155" href="#155">155</a> LinkedList applicables = getApplicables(methods, classes); |
| <a name="156" href="#156">156</a> |
| <a name="157" href="#157">157</a> <strong class="jxr_keyword">if</strong>(applicables.isEmpty()) |
| <a name="158" href="#158">158</a> { |
| <a name="159" href="#159">159</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>; |
| <a name="160" href="#160">160</a> } |
| <a name="161" href="#161">161</a> |
| <a name="162" href="#162">162</a> <strong class="jxr_keyword">if</strong>(applicables.size() == 1) |
| <a name="163" href="#163">163</a> { |
| <a name="164" href="#164">164</a> <strong class="jxr_keyword">return</strong> (Method)applicables.getFirst(); |
| <a name="165" href="#165">165</a> } |
| <a name="166" href="#166">166</a> |
| <a name="167" href="#167">167</a> <em class="jxr_comment">/*</em> |
| <a name="168" href="#168">168</a> <em class="jxr_comment"> * This list will contain the maximally specific methods. Hopefully at</em> |
| <a name="169" href="#169">169</a> <em class="jxr_comment"> * the end of the below loop, the list will contain exactly one method,</em> |
| <a name="170" href="#170">170</a> <em class="jxr_comment"> * (the most specific method) otherwise we have ambiguity.</em> |
| <a name="171" href="#171">171</a> <em class="jxr_comment"> */</em> |
| <a name="172" href="#172">172</a> |
| <a name="173" href="#173">173</a> LinkedList maximals = <strong class="jxr_keyword">new</strong> LinkedList(); |
| <a name="174" href="#174">174</a> |
| <a name="175" href="#175">175</a> <strong class="jxr_keyword">for</strong> (Iterator applicable = applicables.iterator(); |
| <a name="176" href="#176">176</a> applicable.hasNext();) |
| <a name="177" href="#177">177</a> { |
| <a name="178" href="#178">178</a> Method app = (Method) applicable.next(); |
| <a name="179" href="#179">179</a> Class[] appArgs = app.getParameterTypes(); |
| <a name="180" href="#180">180</a> <strong class="jxr_keyword">boolean</strong> lessSpecific = false; |
| <a name="181" href="#181">181</a> |
| <a name="182" href="#182">182</a> <strong class="jxr_keyword">for</strong> (Iterator maximal = maximals.iterator(); |
| <a name="183" href="#183">183</a> !lessSpecific && maximal.hasNext();) |
| <a name="184" href="#184">184</a> { |
| <a name="185" href="#185">185</a> Method max = (Method) maximal.next(); |
| <a name="186" href="#186">186</a> |
| <a name="187" href="#187">187</a> <strong class="jxr_keyword">switch</strong>(moreSpecific(appArgs, max.getParameterTypes())) |
| <a name="188" href="#188">188</a> { |
| <a name="189" href="#189">189</a> <strong class="jxr_keyword">case</strong> MORE_SPECIFIC: |
| <a name="190" href="#190">190</a> { |
| <a name="191" href="#191">191</a> <em class="jxr_comment">/*</em> |
| <a name="192" href="#192">192</a> <em class="jxr_comment"> * This method is more specific than the previously</em> |
| <a name="193" href="#193">193</a> <em class="jxr_comment"> * known maximally specific, so remove the old maximum.</em> |
| <a name="194" href="#194">194</a> <em class="jxr_comment"> */</em> |
| <a name="195" href="#195">195</a> |
| <a name="196" href="#196">196</a> maximal.remove(); |
| <a name="197" href="#197">197</a> <strong class="jxr_keyword">break</strong>; |
| <a name="198" href="#198">198</a> } |
| <a name="199" href="#199">199</a> |
| <a name="200" href="#200">200</a> <strong class="jxr_keyword">case</strong> LESS_SPECIFIC: |
| <a name="201" href="#201">201</a> { |
| <a name="202" href="#202">202</a> <em class="jxr_comment">/*</em> |
| <a name="203" href="#203">203</a> <em class="jxr_comment"> * This method is less specific than some of the</em> |
| <a name="204" href="#204">204</a> <em class="jxr_comment"> * currently known maximally specific methods, so we</em> |
| <a name="205" href="#205">205</a> <em class="jxr_comment"> * won't add it into the set of maximally specific</em> |
| <a name="206" href="#206">206</a> <em class="jxr_comment"> * methods</em> |
| <a name="207" href="#207">207</a> <em class="jxr_comment"> */</em> |
| <a name="208" href="#208">208</a> |
| <a name="209" href="#209">209</a> lessSpecific = <strong class="jxr_keyword">true</strong>; |
| <a name="210" href="#210">210</a> <strong class="jxr_keyword">break</strong>; |
| <a name="211" href="#211">211</a> } |
| <a name="212" href="#212">212</a> } |
| <a name="213" href="#213">213</a> } |
| <a name="214" href="#214">214</a> |
| <a name="215" href="#215">215</a> <strong class="jxr_keyword">if</strong>(!lessSpecific) |
| <a name="216" href="#216">216</a> { |
| <a name="217" href="#217">217</a> maximals.addLast(app); |
| <a name="218" href="#218">218</a> } |
| <a name="219" href="#219">219</a> } |
| <a name="220" href="#220">220</a> |
| <a name="221" href="#221">221</a> <strong class="jxr_keyword">if</strong>(maximals.size() > 1) |
| <a name="222" href="#222">222</a> { |
| <a name="223" href="#223">223</a> <em class="jxr_comment">// We have more than one maximally specific method</em> |
| <a name="224" href="#224">224</a> <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/velocity/util/introspection/MethodMap.html">AmbiguousException</a>(); |
| <a name="225" href="#225">225</a> } |
| <a name="226" href="#226">226</a> |
| <a name="227" href="#227">227</a> <strong class="jxr_keyword">return</strong> (Method)maximals.getFirst(); |
| <a name="228" href="#228">228</a> } |
| <a name="229" href="#229">229</a> |
| <a name="230" href="#230">230</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="231" href="#231">231</a> <em class="jxr_javadoccomment"> * Determines which method signature (represented by a class array) is more</em> |
| <a name="232" href="#232">232</a> <em class="jxr_javadoccomment"> * specific. This defines a partial ordering on the method signatures.</em> |
| <a name="233" href="#233">233</a> <em class="jxr_javadoccomment"> * @param c1 first signature to compare</em> |
| <a name="234" href="#234">234</a> <em class="jxr_javadoccomment"> * @param c2 second signature to compare</em> |
| <a name="235" href="#235">235</a> <em class="jxr_javadoccomment"> * @return MORE_SPECIFIC if c1 is more specific than c2, LESS_SPECIFIC if</em> |
| <a name="236" href="#236">236</a> <em class="jxr_javadoccomment"> * c1 is less specific than c2, INCOMPARABLE if they are incomparable.</em> |
| <a name="237" href="#237">237</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="238" href="#238">238</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> moreSpecific(Class[] c1, Class[] c2) |
| <a name="239" href="#239">239</a> { |
| <a name="240" href="#240">240</a> <strong class="jxr_keyword">boolean</strong> c1MoreSpecific = false; |
| <a name="241" href="#241">241</a> <strong class="jxr_keyword">boolean</strong> c2MoreSpecific = false; |
| <a name="242" href="#242">242</a> |
| <a name="243" href="#243">243</a> <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> i = 0; i < c1.length; ++i) |
| <a name="244" href="#244">244</a> { |
| <a name="245" href="#245">245</a> <strong class="jxr_keyword">if</strong>(c1[i] != c2[i]) |
| <a name="246" href="#246">246</a> { |
| <a name="247" href="#247">247</a> c1MoreSpecific = |
| <a name="248" href="#248">248</a> c1MoreSpecific || |
| <a name="249" href="#249">249</a> isStrictMethodInvocationConvertible(c2[i], c1[i]); |
| <a name="250" href="#250">250</a> c2MoreSpecific = |
| <a name="251" href="#251">251</a> c2MoreSpecific || |
| <a name="252" href="#252">252</a> isStrictMethodInvocationConvertible(c1[i], c2[i]); |
| <a name="253" href="#253">253</a> } |
| <a name="254" href="#254">254</a> } |
| <a name="255" href="#255">255</a> |
| <a name="256" href="#256">256</a> <strong class="jxr_keyword">if</strong>(c1MoreSpecific) |
| <a name="257" href="#257">257</a> { |
| <a name="258" href="#258">258</a> <strong class="jxr_keyword">if</strong>(c2MoreSpecific) |
| <a name="259" href="#259">259</a> { |
| <a name="260" href="#260">260</a> <em class="jxr_comment">/*</em> |
| <a name="261" href="#261">261</a> <em class="jxr_comment"> * Incomparable due to cross-assignable arguments (i.e.</em> |
| <a name="262" href="#262">262</a> <em class="jxr_comment"> * foo(String, Object) vs. foo(Object, String))</em> |
| <a name="263" href="#263">263</a> <em class="jxr_comment"> */</em> |
| <a name="264" href="#264">264</a> |
| <a name="265" href="#265">265</a> <strong class="jxr_keyword">return</strong> INCOMPARABLE; |
| <a name="266" href="#266">266</a> } |
| <a name="267" href="#267">267</a> |
| <a name="268" href="#268">268</a> <strong class="jxr_keyword">return</strong> MORE_SPECIFIC; |
| <a name="269" href="#269">269</a> } |
| <a name="270" href="#270">270</a> |
| <a name="271" href="#271">271</a> <strong class="jxr_keyword">if</strong>(c2MoreSpecific) |
| <a name="272" href="#272">272</a> { |
| <a name="273" href="#273">273</a> <strong class="jxr_keyword">return</strong> LESS_SPECIFIC; |
| <a name="274" href="#274">274</a> } |
| <a name="275" href="#275">275</a> |
| <a name="276" href="#276">276</a> <em class="jxr_comment">/*</em> |
| <a name="277" href="#277">277</a> <em class="jxr_comment"> * Incomparable due to non-related arguments (i.e.</em> |
| <a name="278" href="#278">278</a> <em class="jxr_comment"> * foo(Runnable) vs. foo(Serializable))</em> |
| <a name="279" href="#279">279</a> <em class="jxr_comment"> */</em> |
| <a name="280" href="#280">280</a> |
| <a name="281" href="#281">281</a> <strong class="jxr_keyword">return</strong> INCOMPARABLE; |
| <a name="282" href="#282">282</a> } |
| <a name="283" href="#283">283</a> |
| <a name="284" href="#284">284</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="285" href="#285">285</a> <em class="jxr_javadoccomment"> * Returns all methods that are applicable to actual argument types.</em> |
| <a name="286" href="#286">286</a> <em class="jxr_javadoccomment"> * @param methods list of all candidate methods</em> |
| <a name="287" href="#287">287</a> <em class="jxr_javadoccomment"> * @param classes the actual types of the arguments</em> |
| <a name="288" href="#288">288</a> <em class="jxr_javadoccomment"> * @return a list that contains only applicable methods (number of</em> |
| <a name="289" href="#289">289</a> <em class="jxr_javadoccomment"> * formal and actual arguments matches, and argument types are assignable</em> |
| <a name="290" href="#290">290</a> <em class="jxr_javadoccomment"> * to formal types through a method invocation conversion).</em> |
| <a name="291" href="#291">291</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="292" href="#292">292</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> LinkedList getApplicables(List methods, Class[] classes) |
| <a name="293" href="#293">293</a> { |
| <a name="294" href="#294">294</a> LinkedList list = <strong class="jxr_keyword">new</strong> LinkedList(); |
| <a name="295" href="#295">295</a> |
| <a name="296" href="#296">296</a> <strong class="jxr_keyword">for</strong> (Iterator imethod = methods.iterator(); imethod.hasNext();) |
| <a name="297" href="#297">297</a> { |
| <a name="298" href="#298">298</a> Method method = (Method) imethod.next(); |
| <a name="299" href="#299">299</a> |
| <a name="300" href="#300">300</a> <strong class="jxr_keyword">if</strong>(isApplicable(method, classes)) |
| <a name="301" href="#301">301</a> { |
| <a name="302" href="#302">302</a> list.add(method); |
| <a name="303" href="#303">303</a> } |
| <a name="304" href="#304">304</a> |
| <a name="305" href="#305">305</a> } |
| <a name="306" href="#306">306</a> <strong class="jxr_keyword">return</strong> list; |
| <a name="307" href="#307">307</a> } |
| <a name="308" href="#308">308</a> |
| <a name="309" href="#309">309</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="310" href="#310">310</a> <em class="jxr_javadoccomment"> * Returns true if the supplied method is applicable to actual</em> |
| <a name="311" href="#311">311</a> <em class="jxr_javadoccomment"> * argument types.</em> |
| <a name="312" href="#312">312</a> <em class="jxr_javadoccomment"> * </em> |
| <a name="313" href="#313">313</a> <em class="jxr_javadoccomment"> * @param method method that will be called</em> |
| <a name="314" href="#314">314</a> <em class="jxr_javadoccomment"> * @param classes arguments to method</em> |
| <a name="315" href="#315">315</a> <em class="jxr_javadoccomment"> * @return true if method is applicable to arguments</em> |
| <a name="316" href="#316">316</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="317" href="#317">317</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isApplicable(Method method, Class[] classes) |
| <a name="318" href="#318">318</a> { |
| <a name="319" href="#319">319</a> Class[] methodArgs = method.getParameterTypes(); |
| <a name="320" href="#320">320</a> |
| <a name="321" href="#321">321</a> <strong class="jxr_keyword">if</strong>(methodArgs.length != classes.length) |
| <a name="322" href="#322">322</a> { |
| <a name="323" href="#323">323</a> <strong class="jxr_keyword">return</strong> false; |
| <a name="324" href="#324">324</a> } |
| <a name="325" href="#325">325</a> |
| <a name="326" href="#326">326</a> <strong class="jxr_keyword">for</strong>(<strong class="jxr_keyword">int</strong> i = 0; i < classes.length; ++i) |
| <a name="327" href="#327">327</a> { |
| <a name="328" href="#328">328</a> <strong class="jxr_keyword">if</strong>(!isMethodInvocationConvertible(methodArgs[i], classes[i])) |
| <a name="329" href="#329">329</a> { |
| <a name="330" href="#330">330</a> <strong class="jxr_keyword">return</strong> false; |
| <a name="331" href="#331">331</a> } |
| <a name="332" href="#332">332</a> } |
| <a name="333" href="#333">333</a> |
| <a name="334" href="#334">334</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="335" href="#335">335</a> } |
| <a name="336" href="#336">336</a> |
| <a name="337" href="#337">337</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="338" href="#338">338</a> <em class="jxr_javadoccomment"> * Determines whether a type represented by a class object is</em> |
| <a name="339" href="#339">339</a> <em class="jxr_javadoccomment"> * convertible to another type represented by a class object using a</em> |
| <a name="340" href="#340">340</a> <em class="jxr_javadoccomment"> * method invocation conversion, treating object types of primitive</em> |
| <a name="341" href="#341">341</a> <em class="jxr_javadoccomment"> * types as if they were primitive types (that is, a Boolean actual</em> |
| <a name="342" href="#342">342</a> <em class="jxr_javadoccomment"> * parameter type matches boolean primitive formal type). This behavior</em> |
| <a name="343" href="#343">343</a> <em class="jxr_javadoccomment"> * is because this method is used to determine applicable methods for</em> |
| <a name="344" href="#344">344</a> <em class="jxr_javadoccomment"> * an actual parameter list, and primitive types are represented by</em> |
| <a name="345" href="#345">345</a> <em class="jxr_javadoccomment"> * their object duals in reflective method calls.</em> |
| <a name="346" href="#346">346</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="347" href="#347">347</a> <em class="jxr_javadoccomment"> * @param formal the formal parameter type to which the actual</em> |
| <a name="348" href="#348">348</a> <em class="jxr_javadoccomment"> * parameter type should be convertible</em> |
| <a name="349" href="#349">349</a> <em class="jxr_javadoccomment"> * @param actual the actual parameter type.</em> |
| <a name="350" href="#350">350</a> <em class="jxr_javadoccomment"> * @return true if either formal type is assignable from actual type,</em> |
| <a name="351" href="#351">351</a> <em class="jxr_javadoccomment"> * or formal is a primitive type and actual is its corresponding object</em> |
| <a name="352" href="#352">352</a> <em class="jxr_javadoccomment"> * type or an object type of a primitive type that can be converted to</em> |
| <a name="353" href="#353">353</a> <em class="jxr_javadoccomment"> * the formal type.</em> |
| <a name="354" href="#354">354</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="355" href="#355">355</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isMethodInvocationConvertible(Class formal, |
| <a name="356" href="#356">356</a> Class actual) |
| <a name="357" href="#357">357</a> { |
| <a name="358" href="#358">358</a> <em class="jxr_comment">/*</em> |
| <a name="359" href="#359">359</a> <em class="jxr_comment"> * if it's a null, it means the arg was null</em> |
| <a name="360" href="#360">360</a> <em class="jxr_comment"> */</em> |
| <a name="361" href="#361">361</a> <strong class="jxr_keyword">if</strong> (actual == <strong class="jxr_keyword">null</strong> && !formal.isPrimitive()) |
| <a name="362" href="#362">362</a> { |
| <a name="363" href="#363">363</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="364" href="#364">364</a> } |
| <a name="365" href="#365">365</a> |
| <a name="366" href="#366">366</a> <em class="jxr_comment">/*</em> |
| <a name="367" href="#367">367</a> <em class="jxr_comment"> * Check for identity or widening reference conversion</em> |
| <a name="368" href="#368">368</a> <em class="jxr_comment"> */</em> |
| <a name="369" href="#369">369</a> |
| <a name="370" href="#370">370</a> <strong class="jxr_keyword">if</strong> (actual != <strong class="jxr_keyword">null</strong> && formal.isAssignableFrom(actual)) |
| <a name="371" href="#371">371</a> { |
| <a name="372" href="#372">372</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="373" href="#373">373</a> } |
| <a name="374" href="#374">374</a> |
| <a name="375" href="#375">375</a> <em class="jxr_comment">/*</em> |
| <a name="376" href="#376">376</a> <em class="jxr_comment"> * Check for boxing with widening primitive conversion. Note that</em> |
| <a name="377" href="#377">377</a> <em class="jxr_comment"> * actual parameters are never primitives.</em> |
| <a name="378" href="#378">378</a> <em class="jxr_comment"> */</em> |
| <a name="379" href="#379">379</a> |
| <a name="380" href="#380">380</a> <strong class="jxr_keyword">if</strong> (formal.isPrimitive()) |
| <a name="381" href="#381">381</a> { |
| <a name="382" href="#382">382</a> <strong class="jxr_keyword">if</strong>(formal == Boolean.TYPE && actual == Boolean.<strong class="jxr_keyword">class</strong>) |
| <a name="383" href="#383">383</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="384" href="#384">384</a> <strong class="jxr_keyword">if</strong>(formal == Character.TYPE && actual == Character.<strong class="jxr_keyword">class</strong>) |
| <a name="385" href="#385">385</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="386" href="#386">386</a> <strong class="jxr_keyword">if</strong>(formal == Byte.TYPE && actual == Byte.<strong class="jxr_keyword">class</strong>) |
| <a name="387" href="#387">387</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="388" href="#388">388</a> <strong class="jxr_keyword">if</strong>(formal == Short.TYPE && |
| <a name="389" href="#389">389</a> (actual == Short.<strong class="jxr_keyword">class</strong> || actual == Byte.<strong class="jxr_keyword">class</strong>)) |
| <a name="390" href="#390">390</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="391" href="#391">391</a> <strong class="jxr_keyword">if</strong>(formal == Integer.TYPE && |
| <a name="392" href="#392">392</a> (actual == Integer.<strong class="jxr_keyword">class</strong> || actual == Short.<strong class="jxr_keyword">class</strong> || |
| <a name="393" href="#393">393</a> actual == Byte.<strong class="jxr_keyword">class</strong>)) |
| <a name="394" href="#394">394</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="395" href="#395">395</a> <strong class="jxr_keyword">if</strong>(formal == Long.TYPE && |
| <a name="396" href="#396">396</a> (actual == Long.<strong class="jxr_keyword">class</strong> || actual == Integer.<strong class="jxr_keyword">class</strong> || |
| <a name="397" href="#397">397</a> actual == Short.<strong class="jxr_keyword">class</strong> || actual == Byte.<strong class="jxr_keyword">class</strong>)) |
| <a name="398" href="#398">398</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="399" href="#399">399</a> <strong class="jxr_keyword">if</strong>(formal == Float.TYPE && |
| <a name="400" href="#400">400</a> (actual == Float.<strong class="jxr_keyword">class</strong> || actual == Long.<strong class="jxr_keyword">class</strong> || |
| <a name="401" href="#401">401</a> actual == Integer.<strong class="jxr_keyword">class</strong> || actual == Short.<strong class="jxr_keyword">class</strong> || |
| <a name="402" href="#402">402</a> actual == Byte.<strong class="jxr_keyword">class</strong>)) |
| <a name="403" href="#403">403</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="404" href="#404">404</a> <strong class="jxr_keyword">if</strong>(formal == Double.TYPE && |
| <a name="405" href="#405">405</a> (actual == Double.<strong class="jxr_keyword">class</strong> || actual == Float.<strong class="jxr_keyword">class</strong> || |
| <a name="406" href="#406">406</a> actual == Long.<strong class="jxr_keyword">class</strong> || actual == Integer.<strong class="jxr_keyword">class</strong> || |
| <a name="407" href="#407">407</a> actual == Short.<strong class="jxr_keyword">class</strong> || actual == Byte.<strong class="jxr_keyword">class</strong>)) |
| <a name="408" href="#408">408</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="409" href="#409">409</a> } |
| <a name="410" href="#410">410</a> |
| <a name="411" href="#411">411</a> <strong class="jxr_keyword">return</strong> false; |
| <a name="412" href="#412">412</a> } |
| <a name="413" href="#413">413</a> |
| <a name="414" href="#414">414</a> <em class="jxr_javadoccomment">/**</em> |
| <a name="415" href="#415">415</a> <em class="jxr_javadoccomment"> * Determines whether a type represented by a class object is</em> |
| <a name="416" href="#416">416</a> <em class="jxr_javadoccomment"> * convertible to another type represented by a class object using a</em> |
| <a name="417" href="#417">417</a> <em class="jxr_javadoccomment"> * method invocation conversion, without matching object and primitive</em> |
| <a name="418" href="#418">418</a> <em class="jxr_javadoccomment"> * types. This method is used to determine the more specific type when</em> |
| <a name="419" href="#419">419</a> <em class="jxr_javadoccomment"> * comparing signatures of methods.</em> |
| <a name="420" href="#420">420</a> <em class="jxr_javadoccomment"> *</em> |
| <a name="421" href="#421">421</a> <em class="jxr_javadoccomment"> * @param formal the formal parameter type to which the actual</em> |
| <a name="422" href="#422">422</a> <em class="jxr_javadoccomment"> * parameter type should be convertible</em> |
| <a name="423" href="#423">423</a> <em class="jxr_javadoccomment"> * @param actual the actual parameter type.</em> |
| <a name="424" href="#424">424</a> <em class="jxr_javadoccomment"> * @return true if either formal type is assignable from actual type,</em> |
| <a name="425" href="#425">425</a> <em class="jxr_javadoccomment"> * or formal and actual are both primitive types and actual can be</em> |
| <a name="426" href="#426">426</a> <em class="jxr_javadoccomment"> * subject to widening conversion to formal.</em> |
| <a name="427" href="#427">427</a> <em class="jxr_javadoccomment"> */</em> |
| <a name="428" href="#428">428</a> <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> isStrictMethodInvocationConvertible(Class formal, |
| <a name="429" href="#429">429</a> Class actual) |
| <a name="430" href="#430">430</a> { |
| <a name="431" href="#431">431</a> <em class="jxr_comment">/*</em> |
| <a name="432" href="#432">432</a> <em class="jxr_comment"> * we shouldn't get a null into, but if so</em> |
| <a name="433" href="#433">433</a> <em class="jxr_comment"> */</em> |
| <a name="434" href="#434">434</a> <strong class="jxr_keyword">if</strong> (actual == <strong class="jxr_keyword">null</strong> && !formal.isPrimitive()) |
| <a name="435" href="#435">435</a> { |
| <a name="436" href="#436">436</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="437" href="#437">437</a> } |
| <a name="438" href="#438">438</a> |
| <a name="439" href="#439">439</a> <em class="jxr_comment">/*</em> |
| <a name="440" href="#440">440</a> <em class="jxr_comment"> * Check for identity or widening reference conversion</em> |
| <a name="441" href="#441">441</a> <em class="jxr_comment"> */</em> |
| <a name="442" href="#442">442</a> |
| <a name="443" href="#443">443</a> <strong class="jxr_keyword">if</strong>(formal.isAssignableFrom(actual)) |
| <a name="444" href="#444">444</a> { |
| <a name="445" href="#445">445</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="446" href="#446">446</a> } |
| <a name="447" href="#447">447</a> |
| <a name="448" href="#448">448</a> <em class="jxr_comment">/*</em> |
| <a name="449" href="#449">449</a> <em class="jxr_comment"> * Check for widening primitive conversion.</em> |
| <a name="450" href="#450">450</a> <em class="jxr_comment"> */</em> |
| <a name="451" href="#451">451</a> |
| <a name="452" href="#452">452</a> <strong class="jxr_keyword">if</strong>(formal.isPrimitive()) |
| <a name="453" href="#453">453</a> { |
| <a name="454" href="#454">454</a> <strong class="jxr_keyword">if</strong>(formal == Short.TYPE && (actual == Byte.TYPE)) |
| <a name="455" href="#455">455</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="456" href="#456">456</a> <strong class="jxr_keyword">if</strong>(formal == Integer.TYPE && |
| <a name="457" href="#457">457</a> (actual == Short.TYPE || actual == Byte.TYPE)) |
| <a name="458" href="#458">458</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="459" href="#459">459</a> <strong class="jxr_keyword">if</strong>(formal == Long.TYPE && |
| <a name="460" href="#460">460</a> (actual == Integer.TYPE || actual == Short.TYPE || |
| <a name="461" href="#461">461</a> actual == Byte.TYPE)) |
| <a name="462" href="#462">462</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="463" href="#463">463</a> <strong class="jxr_keyword">if</strong>(formal == Float.TYPE && |
| <a name="464" href="#464">464</a> (actual == Long.TYPE || actual == Integer.TYPE || |
| <a name="465" href="#465">465</a> actual == Short.TYPE || actual == Byte.TYPE)) |
| <a name="466" href="#466">466</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="467" href="#467">467</a> <strong class="jxr_keyword">if</strong>(formal == Double.TYPE && |
| <a name="468" href="#468">468</a> (actual == Float.TYPE || actual == Long.TYPE || |
| <a name="469" href="#469">469</a> actual == Integer.TYPE || actual == Short.TYPE || |
| <a name="470" href="#470">470</a> actual == Byte.TYPE)) |
| <a name="471" href="#471">471</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>; |
| <a name="472" href="#472">472</a> } |
| <a name="473" href="#473">473</a> <strong class="jxr_keyword">return</strong> false; |
| <a name="474" href="#474">474</a> } |
| <a name="475" href="#475">475</a> } |
| </pre> |
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