oracle.toplink.essentials.internal.expressions.ExpressionOperatorConverter Maven / Gradle / Ivy
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package oracle.toplink.essentials.internal.expressions;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.expressions.ExpressionOperator;
import oracle.toplink.essentials.internal.helper.Helper;
import oracle.toplink.essentials.mappings.converters.ObjectTypeConverter;
import oracle.toplink.essentials.sessions.Session;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* INTERNAL:
* Used by function operators in deployment xml generation to accomodate custom functions.
* There is no more validation on read because any custom function has to be accepted.
* The custom function is assumed to be a normal prefix function. The first element in the
* databaseStrings of the operator is in the format of databaseString(, e.g. AVG(. "(" will
* be removed on write and attached back on read.
*/
public class ExpressionOperatorConverter extends ObjectTypeConverter {
/**
* INTERNAL:
* Convert to the data value.
*/
public Object convertObjectValueToDataValue(Object attributeValue, Session session) {
Object fieldValue;
if (attributeValue == null) {
fieldValue = getAttributeToFieldValues().get(Helper.getNullWrapper());
} else {
fieldValue = getAttributeToFieldValues().get(attributeValue);
if (fieldValue == null) {
//Custom function. Remove "(".
if (((ExpressionOperator)attributeValue).getDatabaseStrings() != null) {
String databaseString = ((ExpressionOperator)attributeValue).getDatabaseStrings()[0];
fieldValue = databaseString.substring(0, databaseString.length()-1);
} else {
throw DescriptorException.noAttributeValueConversionToFieldValueProvided(attributeValue, getMapping());
}
}
}
return fieldValue;
}
/**
* INTERNAL:
* Returns the corresponding attribute value for the specified field value.
*/
public Object convertDataValueToObjectValue(Object fieldValue, Session session) {
Object attributeValue = null;
if (fieldValue == null) {
attributeValue = getFieldToAttributeValues().get(Helper.getNullWrapper());
} else {
try {
fieldValue = ((AbstractSession)session).getDatasourcePlatform().getConversionManager().convertObject(fieldValue, getFieldClassification());
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(mapping, mapping.getDescriptor(), e);
}
attributeValue = getFieldToAttributeValues().get(fieldValue);
//Custom function. Create an operator for it.
if (attributeValue == null) {
attributeValue = ExpressionOperator.simpleFunction(0, (String)fieldValue);
}
}
return attributeValue;
}
}