public Object visit(BBOX filter, Object notUsed) {
if (filter instanceof BBOX3D && !fcs.supports(BBOX3D.class)) {
postStack.push(filter);
} else if (!fcs.supports(BBOX.class)) {
postStack.push(filter);
} else {
preStack.push(filter);
}
return null;
}
/** @see org.geotools.filter.FilterVisitor#visit(org.geotools.filter.FunctionExpression) */
public Object visit(Function expression, Object notUsed) {
if (!fcs.supports(expression.getClass())) {
postStack.push(expression);
return null;
}
if (expression.getName() == null) {
postStack.push(expression);
return null;
}
int i = postStack.size();
int j = preStack.size();
for (int k = 0; k < expression.getParameters().size(); k++) {
((Expression) expression.getParameters().get(i)).accept(this, null);
if (i < postStack.size()) {
while (j < preStack.size()) preStack.pop();
postStack.pop();
postStack.push(expression);
return null;
}
}
while (j < preStack.size()) preStack.pop();
preStack.push(expression);
return null;
}
/**
* @see FilterVisitor#visit(ExcludeFilter, Object)
* @param filter the {@link Filter} to visit
*/
public void visit(ExcludeFilter filter) {
if (fcs.supports(Filter.EXCLUDE)) {
preStack.push(filter);
} else {
postStack.push(filter);
}
}
public Object visit(ExcludeFilter filter, Object notUsed) {
if (fcs.supports(Filter.EXCLUDE)) {
preStack.push(filter);
} else {
postStack.push(filter);
}
return null;
}
public Object visit(Id filter, Object notUsed) {
if (original == null) original = filter;
if (!fcs.supports(filter)) {
postStack.push(filter);
} else {
preStack.push(filter);
}
return null;
}
private void visitMathExpression(BinaryExpression expression) {
if (!fcs.supports(Add.class)
&& !fcs.supports(Subtract.class)
&& !fcs.supports(Multiply.class)
&& !fcs.supports(Divide.class)) {
postStack.push(expression);
return;
}
int i = postStack.size();
Expression leftValue = expression.getExpression1();
Expression rightValue = expression.getExpression2();
if (leftValue == null || rightValue == null) {
postStack.push(expression);
return;
}
leftValue.accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(expression);
return;
}
rightValue.accept(this, null);
if (i < postStack.size()) {
preStack.pop(); // left
postStack.pop();
postStack.push(expression);
return;
}
preStack.pop(); // left side
preStack.pop(); // right side
preStack.push(expression);
}
protected Object visit(BinaryTemporalOperator filter, Object data) {
if (original == null) original = filter;
// supports it as a group -- no need to check the type
if (!fcs.supports(filter)) {
postStack.push(filter);
return null;
}
Expression leftValue = filter.getExpression1();
Expression rightValue = filter.getExpression2();
int i = postStack.size();
if (leftValue == null || rightValue == null) {
postStack.push(filter);
return null;
}
leftValue.accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(filter);
return null;
}
rightValue.accept(this, null);
if (i < postStack.size()) {
preStack.pop(); // left
postStack.pop();
postStack.push(filter);
return null;
}
preStack.pop(); // left side
preStack.pop(); // right side
preStack.push(filter);
return null;
}
private void visitBinaryComparisonOperator(BinaryComparisonOperator filter) {
if (original == null) original = filter;
// supports it as a group -- no need to check the type
if (!fcs.supports(FilterCapabilities.SIMPLE_COMPARISONS_OPENGIS)) {
postStack.push(filter);
return;
}
int i = postStack.size();
Expression leftValue = filter.getExpression1();
Expression rightValue = filter.getExpression2();
if (leftValue == null || rightValue == null) {
postStack.push(filter);
return;
}
leftValue.accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(filter);
return;
}
rightValue.accept(this, null);
if (i < postStack.size()) {
preStack.pop(); // left
postStack.pop();
postStack.push(filter);
return;
}
preStack.pop(); // left side
preStack.pop(); // right side
preStack.push(filter);
}
public Object visit(PropertyIsNull filter, Object notUsed) {
if (original == null) original = filter;
if (!fcs.supports(PropertyIsNull.class)) {
postStack.push(filter);
return null;
}
int i = postStack.size();
((PropertyIsNull) filter).getExpression().accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(filter);
}
preStack.pop(); // null
preStack.push(filter);
return null;
}
Object visitNullNil(Filter filter, Expression e) {
if (original == null) original = filter;
if (!fcs.supports(PropertyIsNull.class)) {
postStack.push(filter);
return null;
}
int i = postStack.size();
e.accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(filter);
return null;
}
preStack.pop(); // null
preStack.push(filter);
return null;
}
@Override
protected FilterCapabilities createFilterCapabilities() {
FilterCapabilities caps = new FilterCapabilities();
caps.addAll(SQLDialect.BASE_DBMS_CAPABILITIES);
// adding the spatial filters support
caps.addType(BBOX.class);
caps.addType(Contains.class);
caps.addType(Crosses.class);
caps.addType(Disjoint.class);
caps.addType(Equals.class);
caps.addType(Intersects.class);
caps.addType(Overlaps.class);
caps.addType(Touches.class);
caps.addType(Within.class);
caps.addType(DWithin.class);
caps.addType(Beyond.class);
// temporal filters
caps.addType(After.class);
caps.addType(Before.class);
caps.addType(Begins.class);
caps.addType(BegunBy.class);
caps.addType(During.class);
caps.addType(TOverlaps.class);
caps.addType(Ends.class);
caps.addType(EndedBy.class);
caps.addType(TEquals.class);
return caps;
}
private void visitLogicOperator(Filter filter) {
if (original == null) original = filter;
if (!fcs.supports(Not.class) && !fcs.supports(And.class) && !fcs.supports(Or.class)) {
postStack.push(filter);
return;
}
int i = postStack.size();
int j = preStack.size();
if (filter instanceof Not) {
if (((Not) filter).getFilter() != null) {
Filter next = ((Not) filter).getFilter();
next.accept(this, null);
if (i < postStack.size()) {
// since and can split filter into both pre and post parts
// the parts have to be combined since ~(A^B) == ~A | ~B
// combining is easy since filter==combined result however both post and pre stacks
// must be cleared since both may have components of the filter
popToSize(postStack, i);
popToSize(preStack, j);
postStack.push(filter);
} else {
popToSize(preStack, j);
preStack.push(filter);
}
}
} else {
if (filter instanceof Or) {
Filter orReplacement;
try {
orReplacement = translateOr((Or) filter);
orReplacement.accept(this, null);
} catch (IllegalFilterException e) {
popToSize(preStack, j);
postStack.push(filter);
return;
}
if (postStack.size() > i) {
popToSize(postStack, i);
postStack.push(filter);
return;
}
preStack.pop();
preStack.push(filter);
} else {
// it's an AND
Iterator it = ((And) filter).getChildren().iterator();
while (it.hasNext()) {
Filter next = (Filter) it.next();
next.accept(this, null);
}
// combine the unsupported and add to the top
if (i < postStack.size()) {
if (filter instanceof And) {
Filter f = (Filter) postStack.pop();
while (postStack.size() > i) f = ff.and(f, (Filter) postStack.pop());
postStack.push(f);
if (j < preStack.size()) {
f = (Filter) preStack.pop();
while (preStack.size() > j) f = ff.and(f, (Filter) preStack.pop());
preStack.push(f);
}
} else {
logger.warning("LogicFilter found which is not 'and, or, not");
popToSize(postStack, i);
popToSize(preStack, j);
postStack.push(filter);
}
} else {
popToSize(preStack, j);
preStack.push(filter);
}
}
}
}
private void visitBinarySpatialOperator(BinarySpatialOperator filter) {
if (original == null) original = filter;
Class[] spatialOps =
new Class[] {
Beyond.class,
Contains.class,
Crosses.class,
Disjoint.class,
DWithin.class,
Equals.class,
Intersects.class,
Overlaps.class,
Touches.class,
Within.class
};
for (int i = 0; i < spatialOps.length; i++) {
if (spatialOps[i].isAssignableFrom(filter.getClass())) {
if (!fcs.supports(spatialOps[i])) {
postStack.push(filter);
return;
} else {
// fcs supports this filter, no need to check the rest
break;
}
}
}
// TODO check against tranasaction ?
int i = postStack.size();
Expression leftGeometry, rightGeometry;
leftGeometry = ((BinarySpatialOperator) filter).getExpression1();
rightGeometry = ((BinarySpatialOperator) filter).getExpression2();
if (leftGeometry == null || rightGeometry == null) {
postStack.push(filter);
return;
}
leftGeometry.accept(this, null);
if (i < postStack.size()) {
postStack.pop();
postStack.push(filter);
return;
}
rightGeometry.accept(this, null);
if (i < postStack.size()) {
preStack.pop(); // left
postStack.pop();
postStack.push(filter);
return;
}
preStack.pop(); // left side
preStack.pop(); // right side
preStack.push(filter);
}
/**
* @see FilterVisitor#visit(PropertyIsBetween, Object)
* <p>NOTE: This method is extra documented as an example of how all the other methods are
* implemented. If you want to know how this class works read this method first!
* @param filter the {@link Filter} to visit
*/
public Object visit(PropertyIsBetween filter, Object extradata) {
if (original == null) original = filter;
// Do we support this filter type at all?
if (fcs.supports(PropertyIsBetween.class)) {
// Yes, we do. Now, can we support the sub-filters?
// first, remember how big the current list of "I can't support these"
// filters is.
int i = postStack.size();
Expression lowerBound = filter.getLowerBoundary();
Expression expr = filter.getExpression();
Expression upperBound = filter.getUpperBoundary();
if (lowerBound == null || upperBound == null || expr == null) {
// Well, one of the boundaries is null, so I guess
// we're saying that *no* datastore could support this.
postStack.push(filter);
return null;
}
// Ok, here's the magic. We know how big our list of "can't support"
// filters is. Now we send off the lowerBound Expression to see if
// it can be supported.
lowerBound.accept(this, null);
// Now we're back, and we check. Did the postStack get bigger?
if (i < postStack.size()) {
// Yes, it did. Well, that means we can't support
// this particular filter. Let's back out anything that was
// added by the lowerBound.accept() and add ourselves.
postStack.pop(); // lowerBound.accept()'s bum filter
postStack.push(filter);
return null;
}
// Aha! The postStack didn't get any bigger, so we're still
// all good. Now try again with the middle expression itself...
expr.accept(this, null);
// Did postStack get bigger?
if (i < postStack.size()) {
// Yes, it did. So that means we can't support
// this particular filter. We need to back out what we've
// done, which is BOTH the lowerbounds filter *and* the
// thing that was added by expr.accept() when it failed.
preStack.pop(); // lowerBound.accept()'s success
postStack.pop(); // expr.accept()'s bum filter
postStack.push(filter);
return null;
}
// Same deal again...
upperBound.accept(this, null);
if (i < postStack.size()) {
// post process it
postStack.pop(); // upperBound.accept()'s bum filter
preStack.pop(); // expr.accept()'s success
preStack.pop(); // lowerBound.accept()'s success
postStack.push(filter);
return null;
}
// Well, by getting here it means that postStack didn't get
// taller, even after accepting all three middle filters. This
// means that this whole filter is totally pre-filterable.
// Let's clean up the pre-stack (which got one added to it
// for the success at each of the three above .accept() calls)
// and add us to the stack.
preStack.pop(); // upperBounds.accept()'s success
preStack.pop(); // expr.accept()'s success
preStack.pop(); // lowerBounds.accept()'s success
// finally we add ourselves to the "can be pre-proccessed" filter
// stack. Now when we return we've added exactly one thing to
// the preStack...namely, the given filter.
preStack.push(filter);
} else {
// No, we don't support this filter.
// So we push it onto the postStack, saying
// "Hey, here's one more filter that we don't support.
// Someone who called us may look at this and say,
// "Hmm, I called accept() on this filter and now
// the postStack is taller than it was...I guess this
// filter wasn't accepted.
postStack.push(filter);
}
return null;
}
/**
* Sets the capabilities of this filter.
*
* @return FilterCapabilities for this Filter
*/
protected FilterCapabilities createFilterCapabilities() {
capabilities = new FilterCapabilities();
capabilities.addAll(FilterCapabilities.LOGICAL_OPENGIS);
capabilities.addAll(FilterCapabilities.SIMPLE_COMPARISONS_OPENGIS);
capabilities.addType(FilterCapabilities.FID);
capabilities.addType(FilterCapabilities.BETWEEN);
capabilities.addType(FilterCapabilities.LIKE);
capabilities.addType(FilterCapabilities.NULL_CHECK);
capabilities.addType(FilterCapabilities.SPATIAL_BBOX);
capabilities.addType(FilterCapabilities.SPATIAL_DISJOINT);
capabilities.addType(FilterCapabilities.SPATIAL_WITHIN);
capabilities.addType(FilterCapabilities.SPATIAL_INTERSECT);
capabilities.addType(FilterCapabilities.SPATIAL_CONTAINS);
// temporal filters
capabilities.addType(After.class);
capabilities.addType(Before.class);
capabilities.addType(Begins.class);
capabilities.addType(BegunBy.class);
capabilities.addType(During.class);
capabilities.addType(Ends.class);
capabilities.addType(EndedBy.class);
capabilities.addType(TContains.class);
capabilities.addType(TEquals.class);
return capabilities;
}
/**
* Sets the DB2 filter capabilities.
*
* @return FilterCapabilities for DB2
*/
protected FilterCapabilities createFilterCapabilities() {
FilterCapabilities caps = new FilterCapabilities();
caps.addAll(SQLDialect.BASE_DBMS_CAPABILITIES);
// adding the spatial filters support
caps.addType(BBOX.class);
caps.addType(Contains.class);
caps.addType(Crosses.class);
caps.addType(Disjoint.class);
caps.addType(Equals.class);
caps.addType(Intersects.class);
caps.addType(Overlaps.class);
caps.addType(Touches.class);
caps.addType(Within.class);
caps.addType(DWithin.class);
caps.addType(Beyond.class);
// temporal filters
caps.addType(After.class);
caps.addType(Before.class);
caps.addType(Begins.class);
caps.addType(BegunBy.class);
caps.addType(During.class);
caps.addType(TOverlaps.class);
caps.addType(Ends.class);
caps.addType(EndedBy.class);
caps.addType(TEquals.class);
if (isFunctionEncodingEnabled()) {
// add support for string functions
caps.addType(FilterFunction_strConcat.class);
caps.addType(FilterFunction_strEndsWith.class);
caps.addType(FilterFunction_strStartsWith.class);
caps.addType(FilterFunction_strEqualsIgnoreCase.class);
caps.addType(FilterFunction_strIndexOf.class);
caps.addType(FilterFunction_strLength.class);
caps.addType(FilterFunction_strToLowerCase.class);
caps.addType(FilterFunction_strToUpperCase.class);
caps.addType(FilterFunction_strReplace.class);
caps.addType(FilterFunction_strSubstring.class);
caps.addType(FilterFunction_strSubstringStart.class);
caps.addType(FilterFunction_strTrim.class);
caps.addType(FilterFunction_strTrim2.class);
// add support for math functions
caps.addType(FilterFunction_abs.class);
caps.addType(FilterFunction_abs_2.class);
caps.addType(FilterFunction_abs_3.class);
caps.addType(FilterFunction_abs_4.class);
caps.addType(FilterFunction_ceil.class);
caps.addType(FilterFunction_floor.class);
}
return caps;
}