Data format conversion in java

Basic need is we used to get xml date data type in different formats for data sources. However our federated search engine we are storing in a neutral format. (For simplicity sake.) After analyzing couple of formats, added this code in year 2005. Nowadays Team is using some apache package utils. But I don’t think they will something different. I am not seeing many options.

public static final String[] date_format_list = {
     "yyyy-MM-dd'T'HH:mm:ss'Z'",
     "yyyy-MM-dd'T'HH:mm:ss",
     "yyyy-MM-dd",
     "yyyy-MM-dd hh:mm:ss",
     "yyyy-MM-dd HH:mm:ss",
     "EEE MMM d hh:mm:ss z yyyy"
     /// add your own format here
   };

   public static Date parseDate(String d) throws ParseException {
     return parseInputWithFormats(d, date_format_list);
   }

   public static Date parseInputWithFormats(
           String dateValue,
           String[] formatList
   ) throws ParseException {
     if (dateValue == null || formatList == null || formatList.length == 0) {
       throw new IllegalArgumentException("dateValue is null");
     }
 
     if (dateValue.length() > 1
             && dateValue.startsWith("'")
             && dateValue.endsWith("'")
             ) {
       dateValue = dateValue.substring(1, dateValue.length() - 1);
     }

     SimpleDateFormat dateParser = null;
        for(int i=0;i < formatList.length;i++){
       String format = (String) formatList[i];
       if (dateParser == null) {
         dateParser = new SimpleDateFormat(format, Locale.US);
       } else {
         dateParser.applyPattern(format);
       }
       try {
         return dateParser.parse(dateValue);
       } catch (ParseException pe) {
        //pe.printStackTrace();
       }
     }
     throw new ParseException("Unable to parse the input date " + dateValue, 0);
   }

public static void main(String[] args) {
  String fromDt="";
  String nPattern = "yyyy-MM-dd'T'HH:mm:ss'Z'";
  SimpleDateFormat sdf = new SimpleDateFormat(nPattern);
  
  String currentValue="Fri Jul 22 04:22:14 CEST 2011";
  
   try{  
             fromDt = sdf.format(parseDate(currentValue.toString() )  );
      } catch (Exception e) {
       System.out.print("\n Case1: date format exception"+e.getMessage()+ " SOLR currentValue:"+currentValue);
       fromDt="";
      } 
      System.out.println("Case1. date as str---"+fromDt);
      
      currentValue="2011-07-21 21:22:14";
       try{
              fromDt = sdf.format(parseDate(currentValue.toString() )  );
       } catch (Exception e) {
        System.out.print("\n Case2: date format exception"+e.getMessage()+ " SOLR currentValue:"+currentValue);
        fromDt="";
       } 
      System.out.println("\n Cse2.  date as str---"+fromDt);
  }

Latest family picicture from Disney world.

This is from latest Disney world. (Photo from Disney pass port photo service. We took good number of phones with Disney theme characters. Photos are not brilliant by professional photographer standards. We must not blame them. They are shooting nonstop. However they are not bad too.)

Parsing complex Xsd file with Java code.

This one nearly 4+ year old code. Now Team is using apache xerces XSModel.
However this code is there for sanity check. Still this works fine.
(You need xsom.jar + relaxngDatatype.jar file. Google it. You will find the jars.)

public class XsdReader {
 public static void main (String args[]) 
 {
  XsdReader rr = new XsdReader();
  rr.parseSchema();
    }
 
 public void parseSchema()
 {  
  File file = new File("D:\\tmp\\books.xsd");
  try {
      XSOMParser parser = new XSOMParser();
      parser.parse(file);
      XSSchemaSet sset = parser.getResult();
      XSSchema mys = sset.getSchema(1);
      Iterator itr = sset.iterateSchema();
      while( itr.hasNext() ) {
        XSSchema s = (XSSchema)itr.next();
        System.out.println("Target namespace: "+s.getTargetNamespace());
        XSComplexType ct = mys.getComplexType("books");
        int ctr=0;
        if ( ct != null){
        Collection c = ct.getAttributeUses();
        Iterator i = c.iterator();while(i.hasNext()){
            XSAttributeDecl attributeDecl = i.next().getDecl(); 
           
            System.out.print("ctr="+ctr++ +"name:"+ attributeDecl.getName());
            System.out.print("    type: "+attributeDecl.getType());
            System.out.println("");
          }
        }
        Iterator jtr = s.iterateElementDecls();
        while( jtr.hasNext() ) {
          XSElementDecl e = (XSElementDecl)jtr.next();
          
          System.out.print( e.getName() );
          if( e.isAbstract() )
            System.out.print(" (abstract)");
          System.out.println();
        }
      }
    }
    catch (Exception exp) {
      exp.printStackTrace(System.out);
    }
  }
}