Ok I wrote a custom Java transformer as below. Can someone confirm if this is
the right way?
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.solr.handler.dataimport.Context;
import org.apache.solr.handler.dataimport.DataImporter;
import org.apache.solr.handler.dataimport.Transformer;
//Custom Concatenation transformer
public class ConcatTransformer extends Transformer {
@Override
public Object transformRow(Map<String, Object> row, Context context) {
List<Map<String, String>> fields =
context.getAllEntityFields();
ArrayList<String> arrayValue = new ArrayList<String>();
String columnName = null;
for (Map<String, String> field : fields) {
// Check if this field has cincatField is specified in
the
// data-config.xml
String concat = field.get("concatField");
if (concat != null) {
String[] fieldNames = concat.split(",");
if (fieldNames != null && fieldNames.length >
0) {
// Get column Name
columnName =
field.get(DataImporter.COLUMN);
// Get this field's value from the
current row
ArrayList<?> value1 = (ArrayList<?>)
row.get(fieldNames[0]);
ArrayList<?> value2 = (ArrayList<?>)
row.get(fieldNames[1]);
System.out.println("********" + value1
+ "********"
+ value2);
// Trim and put the updated value back
in the current row
if (value1 != null && value2 != null &&
!(value1.isEmpty()) &&
!(value2.isEmpty())) {
for (int i = 0; i <
value1.size(); i++) {
if (value1.get(i) !=
null && value2.get(i) != null
&&
value1.get(i) != ""
&&
value2.get(i) != "")
arrayValue.add(value1.get(i) + ","
+ value2.get(i));
}
}
}
}
}
row.put(columnName, arrayValue);
return row;
}
}
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