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View level converters must extend the abstract class com.hof.mi.interfaces.Converter. Configuration UI and persistence is available through the normal UserInputParameters API. You can see the documentation on this API <here> here.
There are several required methods to implement The following methods need to be implemented in order to create a view level converter:
- public String getName()
- public boolean acceptsNativeType(int type)
- public abstract int getReturnType()
- public Object convertObject(Object data) throws Exception
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public String getName()
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Below is an example of a TextToNumericConverter implementing this method:
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@Override
public boolean acceptsNativeType(int type) {
if (type == UserInputParameters.TYPE_TEXT) {
return true;
} else {
return false;
}
} |
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@Override
public int getReturnType() {
return UserInputParameters.TYPE_NUMERIC;
} |
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TYPE_NUMERIC
BigDecimal
BigInteger
Other basic Java numeric data types which extend Number
TYPE_DATE
java.util.Date
java.sql.Date
TYPE_TIMESTAMP
java.sql.Timestamp
This method may throw an exception if the data type conversion fails in a way which would indicate that the converter was set up incorrectly, but if the conversion fails for generic reasons such as the data type could not be rectified, or the value was null, then it is accepted to return null.
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@Override
public Object convertObject(Object data) {
if (data == null) return null;
try {
return new BigDecimal((String)data);
} catch (NumberFormatException e) {
return null;
}
} |
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public Object convertObjectReverse(Object data) throws Exception
This method is used in order for Yellowfin to retrieve the initial values of a converted data set after-the-fact. It should perform the opposite conversion which was applied in convertObject and will receive an object of the type specified as the return type of this Converter.
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@Override
public Object convertObjectReverse(Object data) {
if (data == null) return null;
return data.toString();
} |
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