equalsbean.html

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<a name="113" href="#113">113</a> <em>     * @param obj he reference object with which to compare.</em>
<a name="114" href="#114">114</a> <em>     * @return &lt;b>true&lt;/b> if the object passed in the constructor is equal to the 'obj' object.</em>
<a name="115" href="#115">115</a> <em>     *</em>
<a name="116" href="#116">116</a> <em>     */</em>
<a name="117" href="#117">117</a>     <strong>public</strong> <strong>boolean</strong> beanEquals(Object obj) {
<a name="118" href="#118">118</a>         Object bean1 = _obj;
<a name="119" href="#119">119</a>         Object bean2 = obj;
<a name="120" href="#120">120</a>         <strong>boolean</strong> eq;
<a name="121" href="#121">121</a>         <strong>if</strong> (bean1==<strong>null</strong> &amp;&amp; bean2==<strong>null</strong>) {
<a name="122" href="#122">122</a>             eq = <strong>true</strong>;
<a name="123" href="#123">123</a>         }
<a name="124" href="#124">124</a>         <strong>else</strong>
<a name="125" href="#125">125</a>             <strong>if</strong> (bean1==<strong>null</strong> || bean2==<strong>null</strong>) {
<a name="126" href="#126">126</a>                 eq = false;
<a name="127" href="#127">127</a>             }
<a name="128" href="#128">128</a>             <strong>else</strong> {
<a name="129" href="#129">129</a>                 <strong>if</strong> (!_beanClass.isInstance(bean2)) {
<a name="130" href="#130">130</a>                     eq = false;
<a name="131" href="#131">131</a>                 }
<a name="132" href="#132">132</a>                 <strong>else</strong> {
<a name="133" href="#133">133</a>                     eq = <strong>true</strong>;
<a name="134" href="#134">134</a>                     <strong>try</strong> {
<a name="135" href="#135">135</a>                         PropertyDescriptor[] pds = BeanIntrospector.getPropertyDescriptors(_beanClass);
<a name="136" href="#136">136</a>                         <strong>if</strong> (pds!=<strong>null</strong>) {
<a name="137" href="#137">137</a>                             <strong>for</strong> (<strong>int</strong> i = 0; eq &amp;&amp; i&lt;pds.length; i++) {
<a name="138" href="#138">138</a>                                 Method pReadMethod = pds[i].getReadMethod();
<a name="139" href="#139">139</a>                                 <strong>if</strong> (pReadMethod!=<strong>null</strong> &amp;&amp; <em class="comment">// ensure it has a getter method</em>
<a name="140" href="#140">140</a>                                         pReadMethod.getDeclaringClass()!=Object.<strong>class</strong> &amp;&amp; <em class="comment">// filter Object.class getter methods</em>
<a name="141" href="#141">141</a>                                         pReadMethod.getParameterTypes().length==0) {     <em class="comment">// filter getter methods that take parameters</em>
<a name="142" href="#142">142</a>                                     Object value1 = pReadMethod.invoke(bean1, NO_PARAMS);
<a name="143" href="#143">143</a>                                     Object value2 = pReadMethod.invoke(bean2, NO_PARAMS);
<a name="144" href="#144">144</a>                                     eq = doEquals(value1, value2);
<a name="145" href="#145">145</a>                                 }
<a name="146" href="#146">146</a>                             }
<a name="147" href="#147">147</a>                         }
<a name="148" href="#148">148</a>                     }
<a name="149" href="#149">149</a>                     <strong>catch</strong> (Exception ex) {
<a name="150" href="#150">150</a>                         <strong>throw</strong> <strong>new</strong> RuntimeException(<span class="string">"Could not execute equals()"</span>, ex);
<a name="151" href="#151">151</a>                     }
<a name="152" href="#152">152</a>                 }
<a name="153" href="#153">153</a>             }
<a name="154" href="#154">154</a>         <strong>return</strong> eq;
<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>     * Returns the hashcode for this object.</em>
<a name="159" href="#159">159</a> <em>     * &lt;p></em>
<a name="160" href="#160">160</a> <em>     * It follows the contract defined by the Object hashCode() method.</em>
<a name="161" href="#161">161</a> <em>     * &lt;p></em>
<a name="162" href="#162">162</a> <em>     * The hashcode is calculated by getting the hashcode of the Bean String representation.</em>
<a name="163" href="#163">163</a> <em>     * &lt;p></em>
<a name="164" href="#164">164</a> <em>     * To be used by classes extending EqualsBean. Although it works also for classes using</em>
<a name="165" href="#165">165</a> <em>     * EqualsBean in a delegation pattern, for correctness those classes should use the</em>
<a name="166" href="#166">166</a> <em>     * @see #beanHashCode() beanHashCode method.</em>
<a name="167" href="#167">167</a> <em>     * &lt;p></em>
<a name="168" href="#168">168</a> <em>     * @return the hashcode of the bean object.</em>
<a name="169" href="#169">169</a> <em>     *</em>
<a name="170" href="#170">170</a> <em>     */</em>
<a name="171" href="#171">171</a>     <strong>public</strong> <strong>int</strong> hashCode() {
<a name="172" href="#172">172</a>         <strong>return</strong> beanHashCode();
<a name="173" href="#173">173</a>     }
<a name="174" href="#174">174</a> 
<a name="175" href="#175">175</a>     <em>/**<em>*</em></em>
<a name="176" href="#176">176</a> <em>     * Returns the hashcode for the object passed in the constructor.</em>
<a name="177" href="#177">177</a> <em>     * &lt;p></em>
<a name="178" href="#178">178</a> <em>     * It follows the contract defined by the Object hashCode() method.</em>
<a name="179" href="#179">179</a> <em>     * &lt;p></em>
<a name="180" href="#180">180</a> <em>     * The hashcode is calculated by getting the hashcode of the Bean String representation.</em>
<a name="181" href="#181">181</a> <em>     * &lt;p></em>
<a name="182" href="#182">182</a> <em>     * To be used by classes using EqualsBean in a delegation pattern,</em>
<a name="183" href="#183">183</a> <em>     * @see #EqualsBean(Class,Object) constructor.</em>
<a name="184" href="#184">184</a> <em>     * &lt;p></em>
<a name="185" href="#185">185</a> <em>     * @return the hashcode of the bean object.</em>
<a name="186" href="#186">186</a> <em>     *</em>
<a name="187" href="#187">187</a> <em>     */</em>
<a name="188" href="#188">188</a>     <strong>public</strong> <strong>int</strong> beanHashCode() {
<a name="189" href="#189">189</a>         <strong>return</strong> _obj.toString().hashCode();
<a name="190" href="#190">190</a>     }
<a name="191" href="#191">191</a> 
<a name="192" href="#192">192</a> 
<a name="193" href="#193">193</a>     <strong>private</strong> <strong>boolean</strong> doEquals(Object obj1, Object obj2) {
<a name="194" href="#194">194</a>         <strong>boolean</strong> eq = obj1==obj2;
<a name="195" href="#195">195</a>         <strong>if</strong> (!eq &amp;&amp; obj1!=<strong>null</strong> &amp;&amp; obj2!=<strong>null</strong>) {
<a name="196" href="#196">196</a>             Class classObj1 = obj1.getClass();
<a name="197" href="#197">197</a>             Class classObj2 = obj2.getClass();
<a name="198" href="#198">198</a>             <strong>if</strong> (classObj1.isArray() &amp;&amp; classObj2.isArray()) {
<a name="199" href="#199">199</a>                 eq = equalsArray(obj1, obj2);
<a name="200" href="#200">200</a>             }
<a name="201" href="#201">201</a>             <strong>else</strong> {
<a name="202" href="#202">202</a>                 eq = obj1.equals(obj2);
<a name="203" href="#203">203</a>             }
<a name="204" href="#204">204</a>         }
<a name="205" href="#205">205</a>         <strong>return</strong> eq;
<a name="206" href="#206">206</a>     }
<a name="207" href="#207">207</a> 
<a name="208" href="#208">208</a>     <strong>private</strong> <strong>boolean</strong> equalsArray(Object array1, Object array2) {
<a name="209" href="#209">209</a>         <strong>boolean</strong> eq;
<a name="210" href="#210">210</a>         <strong>int</strong> length1 = Array.getLength(array1);
<a name="211" href="#211">211</a>         <strong>int</strong> length2 = Array.getLength(array2);
<a name="212" href="#212">212</a>         <strong>if</strong> (length1==length2) {
<a name="213" href="#213">213</a>             eq = <strong>true</strong>;
<a name="214" href="#214">214</a>             <strong>for</strong> (<strong>int</strong> i = 0; eq &amp;&amp; i&lt;length1; i++) {
<a name="215" href="#215">215</a>                 Object e1 = Array.get(array1, i);
<a name="216" href="#216">216</a>                 Object e2 = Array.get(array2, i);
<a name="217" href="#217">217</a>                 eq = doEquals(e1, e2);
<a name="218" href="#218">218</a>             }
<a name="219" href="#219">219</a>         }
<a name="220" href="#220">220</a>         <strong>else</strong> {
<a name="221" href="#221">221</a>             eq = false;
<a name="222" href="#222">222</a>         }
<a name="223" href="#223">223</a>         <strong>return</strong> eq;
<a name="224" href="#224">224</a>     }
<a name="225" href="#225">225</a> 
<a name="226" href="#226">226</a> }
<a name="227" href="#227">227</a> 
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