private void validateLogicalOperator(final OperatorExpression expression, final Logger log) {
final List<FilterExpression> inputs = expression.getInputs();
// The "and" operator must have inputs, the "or" operator is allowed without inputs (to allow
// empty filters):
if (inputs == null || inputs.size() == 0) {
if (expression.getOperatorType() != OperatorType.OR) {
log.report(MessageKey.DATASET_FILTER_LOGICAL_OPERATOR_WITHOUT_INPUTS);
}
return;
}
// Validate inputs:
for (final FilterExpression input : inputs) {
// Input must exist:
if (input == null) {
log.report(MessageKey.DATASET_FILTER_LOGICAL_OPERATOR_MISSING_INPUT);
continue;
}
// Input must be of type OperatorExpression:
if (input == null || !(input instanceof OperatorExpression)) {
log.report(MessageKey.DATASET_FILTER_LOGICAL_OPERATOR_WRONG_TYPE);
continue;
}
validateOperatorExpression((OperatorExpression) input, log);
}
}
private boolean validateNotNullOperator(final OperatorExpression expression, final Logger log) {
final List<FilterExpression> inputs = expression.getInputs();
// A not null operator must have one input:
if (inputs == null || inputs.size() < 1 || inputs.size() > 2) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_INPUT_COUNT);
return false;
}
// First input must be an instance of AttributeExpression:
if (inputs.get(0) == null
|| !(inputs.get(0) instanceof AttributeExpression)
|| ((AttributeExpression) inputs.get(0)).getAttributeName() == null
|| ((AttributeExpression) inputs.get(0)).getAttributeType() == null) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_NO_ATTRIBUTE);
return false;
}
// The attribute must exist:
final AttributeExpression attributeExpression = (AttributeExpression) inputs.get(0);
final FeatureTypeAttribute attribute =
findAttribute(
attributeExpression.getAttributeName(), attributeExpression.getAttributeType());
if (attribute == null) {
log.report(
MessageKey.DATASET_FILTER_OPERATOR_MISSING_ATTRIBUTE,
attributeExpression.getAttributeName());
return false;
}
return true;
}
private void validateInOperator(final OperatorExpression expression, final Logger log) {
if (!validateOperatorInputs(expression, log)) {
return;
}
final List<FilterExpression> inputs = expression.getInputs();
final ValueExpression valueExpression = (ValueExpression) inputs.get(1);
if (valueExpression.getValueType() != ValueType.STRING) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_INCOMPATIBLE_TYPES);
}
}
private void validateOperatorExpression(final OperatorExpression expression, final Logger log) {
// Expression must have an operator:
final OperatorType operatorType = expression.getOperatorType();
if (operatorType == null) {
log.report(
MessageKey.DATASET_FILTER_TECHNICAL_ERROR,
"An operator expression must have an operator type.");
return;
}
// Operator specific validation:
switch (operatorType) {
// Logical operators:
case AND:
case OR:
validateLogicalOperator(expression, log);
break;
// Comparison operators:
case EQUALS:
case GREATER_THAN:
case GREATER_THAN_EQUAL:
case LESS_THAN:
case LESS_THAN_EQUAL:
case NOT_EQUALS:
validateComparisonOperator(expression, log);
break;
// In-operator:
case IN:
validateInOperator(expression, log);
break;
// Like-operator:
case LIKE:
validateLikeOperator(expression, log);
break;
case NOT_NULL:
validateNotNullOperator(expression, log);
break;
default:
log.report(
MessageKey.DATASET_FILTER_TECHNICAL_ERROR,
String.format("Unknown operator type `%s`", operatorType));
break;
}
}
private void validateComparisonOperator(final OperatorExpression expression, final Logger log) {
if (!validateOperatorInputs(expression, log)) {
return;
}
final List<FilterExpression> inputs = expression.getInputs();
final AttributeExpression attributeExpression = (AttributeExpression) inputs.get(0);
final FeatureTypeAttribute attribute =
findAttribute(
attributeExpression.getAttributeName(), attributeExpression.getAttributeType());
// The attribute and value must have matching types:
if (!compareAttributeType(attribute, ((ValueExpression) inputs.get(1)).getValueType())) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_INCOMPATIBLE_TYPES);
}
}
private boolean validateOperatorInputs(final OperatorExpression expression, final Logger log) {
final List<FilterExpression> inputs = expression.getInputs();
// A comparison operator must have exactly two inputs:
if (inputs == null || inputs.size() != 2) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_INPUT_COUNT);
return false;
}
// First input must be an instance of AttributeExpression:
boolean invalidInputs = false;
if (inputs.get(0) == null
|| !(inputs.get(0) instanceof AttributeExpression)
|| ((AttributeExpression) inputs.get(0)).getAttributeName() == null
|| ((AttributeExpression) inputs.get(0)).getAttributeType() == null) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_NO_ATTRIBUTE);
invalidInputs = true;
}
// Second input must be an instance of ValueExpression:
if (inputs.get(1) == null
|| !(inputs.get(1) instanceof ValueExpression)
|| ((ValueExpression) inputs.get(1)).getStringValue() == null
|| ((ValueExpression) inputs.get(1)).getValueType() == null) {
log.report(MessageKey.DATASET_FILTER_OPERATOR_NO_VALUE);
invalidInputs = true;
}
if (invalidInputs) {
return false;
}
// The attribute must exist:
final AttributeExpression attributeExpression = (AttributeExpression) inputs.get(0);
final FeatureTypeAttribute attribute =
findAttribute(
attributeExpression.getAttributeName(), attributeExpression.getAttributeType());
if (attribute == null) {
log.report(
MessageKey.DATASET_FILTER_OPERATOR_MISSING_ATTRIBUTE,
attributeExpression.getAttributeName());
}
return true;
}