📄 datasetutilities.html
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<FONT color="green">135</FONT> * Private constructor for non-instanceability.<a name="line.135"></a><FONT color="green">136</FONT> */<a name="line.136"></a><FONT color="green">137</FONT> private DatasetUtilities() {<a name="line.137"></a><FONT color="green">138</FONT> // now try to instantiate this ;-)<a name="line.138"></a><FONT color="green">139</FONT> }<a name="line.139"></a><FONT color="green">140</FONT> <a name="line.140"></a><FONT color="green">141</FONT> /**<a name="line.141"></a><FONT color="green">142</FONT> * Calculates the total of all the values in a {@link PieDataset}. If <a name="line.142"></a><FONT color="green">143</FONT> * the dataset contains negative or <code>null</code> values, they are <a name="line.143"></a><FONT color="green">144</FONT> * ignored. <a name="line.144"></a><FONT color="green">145</FONT> *<a name="line.145"></a><FONT color="green">146</FONT> * @param dataset the dataset (<code>null</code> not permitted).<a name="line.146"></a><FONT color="green">147</FONT> *<a name="line.147"></a><FONT color="green">148</FONT> * @return The total.<a name="line.148"></a><FONT color="green">149</FONT> */<a name="line.149"></a><FONT color="green">150</FONT> public static double calculatePieDatasetTotal(PieDataset dataset) {<a name="line.150"></a><FONT color="green">151</FONT> if (dataset == null) {<a name="line.151"></a><FONT color="green">152</FONT> throw new IllegalArgumentException("Null 'dataset' argument.");<a name="line.152"></a><FONT color="green">153</FONT> }<a name="line.153"></a><FONT color="green">154</FONT> List keys = dataset.getKeys();<a name="line.154"></a><FONT color="green">155</FONT> double totalValue = 0;<a name="line.155"></a><FONT color="green">156</FONT> Iterator iterator = keys.iterator();<a name="line.156"></a><FONT color="green">157</FONT> while (iterator.hasNext()) {<a name="line.157"></a><FONT color="green">158</FONT> Comparable current = (Comparable) iterator.next();<a name="line.158"></a><FONT color="green">159</FONT> if (current != null) {<a name="line.159"></a><FONT color="green">160</FONT> Number value = dataset.getValue(current);<a name="line.160"></a><FONT color="green">161</FONT> double v = 0.0;<a name="line.161"></a><FONT color="green">162</FONT> if (value != null) {<a name="line.162"></a><FONT color="green">163</FONT> v = value.doubleValue();<a name="line.163"></a><FONT color="green">164</FONT> }<a name="line.164"></a><FONT color="green">165</FONT> if (v > 0) {<a name="line.165"></a><FONT color="green">166</FONT> totalValue = totalValue + v;<a name="line.166"></a><FONT color="green">167</FONT> }<a name="line.167"></a><FONT color="green">168</FONT> }<a name="line.168"></a><FONT color="green">169</FONT> }<a name="line.169"></a><FONT color="green">170</FONT> return totalValue;<a name="line.170"></a><FONT color="green">171</FONT> }<a name="line.171"></a><FONT color="green">172</FONT> <a name="line.172"></a><FONT color="green">173</FONT> /**<a name="line.173"></a><FONT color="green">174</FONT> * Creates a pie dataset from a table dataset by taking all the values<a name="line.174"></a><FONT color="green">175</FONT> * for a single row.<a name="line.175"></a><FONT color="green">176</FONT> *<a name="line.176"></a><FONT color="green">177</FONT> * @param dataset the dataset (<code>null</code> not permitted).<a name="line.177"></a><FONT color="green">178</FONT> * @param rowKey the row key.<a name="line.178"></a><FONT color="green">179</FONT> *<a name="line.179"></a><FONT color="green">180</FONT> * @return A pie dataset.<a name="line.180"></a><FONT color="green">181</FONT> */<a name="line.181"></a><FONT color="green">182</FONT> public static PieDataset createPieDatasetForRow(CategoryDataset dataset, <a name="line.182"></a><FONT color="green">183</FONT> Comparable rowKey) {<a name="line.183"></a><FONT color="green">184</FONT> int row = dataset.getRowIndex(rowKey);<a name="line.184"></a><FONT color="green">185</FONT> return createPieDatasetForRow(dataset, row);<a name="line.185"></a><FONT color="green">186</FONT> }<a name="line.186"></a><FONT color="green">187</FONT> <a name="line.187"></a><FONT color="green">188</FONT> /**<a name="line.188"></a><FONT color="green">189</FONT> * Creates a pie dataset from a table dataset by taking all the values<a name="line.189"></a><FONT color="green">190</FONT> * for a single row.<a name="line.190"></a><FONT color="green">191</FONT> *<a name="line.191"></a><FONT color="green">192</FONT> * @param dataset the dataset (<code>null</code> not permitted).<a name="line.192"></a><FONT color="green">193</FONT> * @param row the row (zero-based index).<a name="line.193"></a><FONT color="green">194</FONT> *<a name="line.194"></a><FONT color="green">195</FONT> * @return A pie dataset.<a name="line.195"></a><FONT color="green">196</FONT> */<a name="line.196"></a><FONT color="green">197</FONT> public static PieDataset createPieDatasetForRow(CategoryDataset dataset, <a name="line.197"></a><FONT color="green">198</FONT> int row) {<a name="line.198"></a><FONT color="green">199</FONT> DefaultPieDataset result = new DefaultPieDataset();<a name="line.199"></a><FONT color="green">200</FONT> int columnCount = dataset.getColumnCount();<a name="line.200"></a><FONT color="green">201</FONT> for (int current = 0; current < columnCount; current++) {<a name="line.201"></a><FONT color="green">202</FONT> Comparable columnKey = dataset.getColumnKey(current);<a name="line.202"></a><FONT color="green">203</FONT> result.setValue(columnKey, dataset.getValue(row, current));<a name="line.203"></a><FONT color="green">204</FONT> }<a name="line.204"></a><FONT color="green">205</FONT> return result;<a name="line.205"></a><FONT color="green">206</FONT> }<a name="line.206"></a><FONT color="green">207</FONT> <a name="line.207"></a><FONT color="green">208</FONT> /**<a name="line.208"></a><FONT color="green">209</FONT> * Creates a pie dataset from a table dataset by taking all the values<a name="line.209"></a><FONT color="green">210</FONT> * for a single column.<a name="line.210"></a><FONT color="green">211</FONT> *<a name="line.211"></a><FONT color="green">212</FONT> * @param dataset the dataset (<code>null</code> not permitted).<a name="line.212"></a><FONT color="green">213</FONT> * @param columnKey the column key.<a name="line.213"></a><FONT color="green">214</FONT> *<a name="line.214"></a><FONT color="green">215</FONT> * @return A pie dataset.<a name="line.215"></a><FONT color="green">216</FONT> */<a name="line.216"></a><FONT color="green">217</FONT> public static PieDataset createPieDatasetForColumn(CategoryDataset dataset,<a name="line.217"></a><FONT color="green">218</FONT> Comparable columnKey) {<a name="line.218"></a><FONT color="green">219</FONT> int column = dataset.getColumnIndex(columnKey);<a name="line.219"></a><FONT color="green">220</FONT> return createPieDatasetForColumn(dataset, column);<a name="line.220"></a><FONT color="green">221</FONT> }<a name="line.221"></a><FONT color="green">222</FONT> <a name="line.222"></a><FONT color="green">223</FONT> /**<a name="line.223"></a><FONT color="green">224</FONT> * Creates a pie dataset from a {@link CategoryDataset} by taking all the <a name="line.224"></a><FONT color="green">225</FONT> * values for a single column.<a name="line.225"></a><FONT color="green">226</FONT> *<a name="line.226"></a><FONT color="green">227</FONT> * @param dataset the dataset (<code>null</code> not permitted).<a name="line.227"></a><FONT color="green">228</FONT> * @param column the column (zero-based index).<a name="line.228"></a><FONT color="green">229</FONT> *<a name="line.229"></a><FONT color="green">230</FONT> * @return A pie dataset.<a name="line.230"></a><FONT color="green">231</FONT> */<a name="line.231"></a><FONT color="green">232</FONT> public static PieDataset createPieDatasetForColumn(CategoryDataset dataset, <a name="line.232"></a><FONT color="green">233</FONT> int column) {<a name="line.233"></a><FONT color="green">234</FONT> DefaultPieDataset result = new DefaultPieDataset();<a name="line.234"></a><FONT color="green">235</FONT> int rowCount = dataset.getRowCount();<a name="line.235"></a><FONT color="green">236</FONT> for (int i = 0; i < rowCount; i++) {<a name="line.236"></a><FONT color="green">237</FONT> Comparable rowKey = dataset.getRowKey(i);<a name="line.237"></a><FONT color="green">238</FONT> result.setValue(rowKey, dataset.getValue(i, column));<a name="line.238"></a><FONT color="green">239</FONT> }<a name="line.239"></a><FONT color="green">240</FONT> return result;<a name="line.240"></a><FONT color="green">241</FONT> }<a name="line.241"></a><FONT color="green">242</FONT> <a name="line.242"></a><FONT color="green">243</FONT> /**<a name="line.243"></a><FONT color="green">244</FONT> * Creates a new pie dataset based on the supplied dataset, but modified<a name="line.244"></a><FONT color="green">245</FONT> * by aggregating all the low value items (those whose value is lower<a name="line.245"></a><FONT color="green">246</FONT> * than the <code>percentThreshold</code>) into a single item with the<a name="line.246"></a><FONT color="green">247</FONT> * key "Other".<a name="line.247"></a><FONT color="green">248</FONT> *<a name="line.248"></a><FONT color="green">249</FONT> * @param source the source dataset (<code>null</code> not permitted).<a name="line.249"></a><FONT color="green">250</FONT> * @param key a new key for the aggregated items (<code>null</code> not<a name="line.250"></a><FONT color="green">251</FONT> * permitted).<a name="line.251"></a><FONT color="green">252</FONT> * @param minimumPercent the percent threshold.<a name="line.252"></a><FONT color="green">253</FONT> * <a name="line.253"></a><FONT color="green">254</FONT> * @return The pie dataset with (possibly) aggregated items.<a name="line.254"></a><FONT color="green">255</FONT> */<a name="line.255"></a><FONT color="green">256</FONT> public static PieDataset createConsolidatedPieDataset(PieDataset source, <a name="line.256"></a><FONT color="green">257</FONT> Comparable key,<a name="line.257"></a><FONT color="green">258</FONT> double minimumPercent)<a name="line.258"></a><FONT color="green">259</FONT> {<a name="line.259"></a><FONT color="green">260</FONT> return DatasetUtilities.createConsolidatedPieDataset(<a name="line.260"></a><FONT color="green">261</FONT> source, key, minimumPercent, 2<a name="line.261"></a><FONT color="green">262</FONT> );<a name="line.262"></a><FONT color="green">263</FONT> }<a name="line.263"></a><FONT color="green">264</FONT> <a name="line.264"></a><FONT color="green">265</FONT> /**<a name="line.265"></a><FONT color="green">266</FONT> * Creates a new pie dataset based on the supplied dataset, but modified <a name="line.266"></a><FONT color="green">267</FONT> * by aggregating all the low value items (those whose value is lower <a name="line.267"></a><FONT color="green">268</FONT> * than the <code>percentThreshold</code>) into a single item. The <a name="line.268"></a><FONT color="green">269</FONT> * aggregated items are assigned the specified key. Aggregation only <a name="line.269"></a><FONT color="green">270</FONT> * occurs if there are at least <code>minItems</code> items to aggregate.<a name="line.270"></a><FONT color="green">271</FONT> *<a name="line.271"></a>⌨️ 快捷键说明
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