kettle转换中使用javascript例子整理（2）

7（重） JavaScript -dialog.ktr（需要调用Java代码，有界面）

// This JavaScript asks for a start and ending date with text dialog boxes. // It is  a proof of concept if dialogs could be used out of JavaScript within transformations. // This could be a base for discussion if a general input step dialog should be created. // It runs within Spoon, Pan and launched by the "Test script" button within the JavaScript editor. // @author Jens Bleuel // @since 2006-07-11   // to get the "Test script" button at the editor working correctly we need the existing Display / Shell var display; var displayHasToBeDisposed=false; var shell=null;   try {     display=Packages.org.eclipse.swt.widgets.Display.getCurrent();     shell=display.getActiveShell(); } catch(e) {     // if it runs in batch mode (Pan or preview mode) no Display is available, so we have to create one     display=new Packages.org.eclipse.swt.widgets.Display();     displayHasToBeDisposed=true;     shell=new Packages.org.eclipse.swt.widgets.Shell(display); }   // if we run in Pan we need to load the properties: if(!Packages.org.pentaho.di.ui.core.PropsUI.isInitialized()) {     Packages.org.pentaho.di.ui.core.PropsUI.init(display,2); //2=TYPE_PROPERTIES_PAN }   var dateDefaultFrom=DateFromProposal.getString().substr(0,10);//only the date and not the time var dialogDateFrom=newPackages.org.pentaho.di.ui.core.dialog.EnterTextDialog(shell,"Date from", "Please enter the beginning date", dateDefaultFrom); var dateFromAsString=dialogDateFrom.open();   if(dateFromAsString!=null&& dateFromAsString.length()>0) {     var dateDefaultTo=DateToProposal.getString().substr(0,10);//only the date and not the time;     var dialogDateTo=newPackages.org.pentaho.di.ui.core.dialog.EnterTextDialog(shell,"Date to", "Please enter the ending date", dateDefaultTo);     var dateToAsString=dialogDateTo.open();     if(dateToAsString!=null&& dateToAsString.length()>0) {         // here you could check or change formats a.s.o     } else {         // stop transformation when user cancels         throw new Packages.java.lang.RuntimeException("Input canceled by the user.");     } } else {     // stop transformation when user cancels     throw new Packages.java.lang.RuntimeException("Input canceled by the user."); } if(displayHasToBeDisposed) {   display.dispose(); }

文本文件输出

DateFromProposal@DateToProposal@dateFromAsString@dateToAsString 2006/01/01 00:00:00.000@2006/12/31 00:00:00.000@2014/01/02@2014/12/31

8 JavaScript - extract date fromfilename.ktr（从文件名中提取日期，字符串处理）

// C:\temp\LIM_kettle\ST18.PROTOKL.TENOPROD_2006*07_21_00_09 // rightstr(16)，截取右边16个字符 var dat = DIR.Clone().rightstr(16).str2dat("yyyy*MM_dd_HH_mm");

文本文件输出：

DIR@@@dat C:\temp\LIM_kettle\ST18.PROTOKL.TENOPROD_2006*07_21_00_09@@@2006/07/21 00:09:00.000

9 JavaScript - Get the filenamefrom a path.ktr（从路径中提取文件名）

var strArray = File.getString().split("/");//数组 var last = strArray[strArray.length-1];//数组中的最后一个即文件名

文本文件输出

File@@@@last C:/Test/file.txt@@@@file.txt

10.JavaScript - Hex to Integer conversion.ktr（16进制->10进制)

 

java; //不写木发现影响，仅限本例 //16进制->10 var nummerke = Packages.java.lang.Integer.valueOf(Hex.getString(), 16).intValue(); //Alert(nummerke);

文本文件输出：

Hex;nummerke DEAD; 0057005

11 JavaScript - parse Debet-Credit prefix innumbers.ktr（数值中有前缀)

var first = amountField.Clone().substr(0,1).getString(); var amount = amountField.Clone().substr(1).str2num("###.00",".").getNumber();   if (first.equals("D")) {   amount = -amount; }

文本文件输出：

amountField@@@first@@@amount C100.00  @@@C@@@00100.00 D100.00  @@@D@@@-00100.00