private Value castValue(Type type, Value value) {
Value newValue = value;
if (!value.isNull()
&& type.getTypeCode() != value.getType()
&& TypeFactory.canBeCastTo(value.getType(), type.getTypeCode())) {
newValue = value.toType(type.getTypeCode());
}
return newValue;
}
public static void failIfNull(Value... values) throws FunctionException {
for (Value value : values) {
if (value.getType() == Type.NULL) {
throw new FunctionException("Cannot operate in null values");
}
}
}
@Override
public String check(int fieldId, Value value) throws DriverException {
// In order to build pk indexes
initializeEdition();
// Check special case of auto-increment not-null fields
Type type = getMetadata().getFieldType(fieldId);
boolean autoIncrement = type.getBooleanConstraint(Constraint.AUTO_INCREMENT);
if (autoIncrement && type.getBooleanConstraint(Constraint.NOT_NULL) && value.isNull()) {
return null;
}
int fieldType = type.getTypeCode();
// Test geometry types.
if (TypeFactory.isVectorial(type.getTypeCode())) {
int valueType = value.getType();
if (!checkGeometry(valueType, fieldType)) {
return "Can't put a "
+ TypeFactory.getTypeName(valueType)
+ " in a "
+ TypeFactory.getTypeName(fieldType)
+ " column.";
}
}
// Cast value
Value val = castValue(type, value);
int broadType = TypeFactory.getBroaderType(fieldType, val.getType());
if (val.getType() != broadType
&& val.getType() != Type.NULL
&& !checkGeometry(val.getType(), fieldType)
&& fieldType != Type.STRING) {
return "Can't cast a "
+ TypeFactory.getTypeName(value.getType())
+ " to a "
+ TypeFactory.getTypeName(fieldType);
}
// Check constraints
String fieldName = getMetadata().getFieldName(fieldId);
String error = type.check(value);
if (error != null) {
return "Value at field " + getFieldName(fieldId) + " is not valid:" + error;
}
// Check uniqueness
if (type.getBooleanConstraint(Constraint.UNIQUE) || type.getBooleanConstraint(Constraint.PK)) {
// We assume a geometry field can't have unique constraint
IndexQuery iq = new DefaultAlphaQuery(fieldName, value);
Iterator<Integer> it = queryIndex(iq);
while (it.hasNext()) {
if (getFieldValue(it.next(), fieldId).equals(value).getAsBoolean()) {
return fieldName + " column doesn't admit duplicates: " + value;
}
}
}
return null;
}
public static void failIfNotOfType(Value value, int type) throws FunctionException {
if (type != value.getType()) {
throw new FunctionException(value.toString() + " is not of type " + type);
}
}