/**
* @param idx Remove this index from the LHS. returns false if it was NOT allowed to remove this
* item (ie it is used on the RHS).
*/
public boolean removeLhsItem(final int idx) {
final IPattern[] newList = new IPattern[this.lhs.length - 1];
int newIdx = 0;
for (int i = 0; i < this.lhs.length; i++) {
if (i != idx) {
newList[newIdx] = this.lhs[i];
newIdx++;
} else {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
final FactPattern p = (FactPattern) pat;
if (p.getBoundName() != null && isBoundFactUsed(p.getBoundName())) {
return false;
}
}
}
}
this.lhs = newList;
return true;
}
/**
* This will return the FactPattern that a variable is bound to. If the variable is bound to a
* FieldConstraint the parent FactPattern will be returned.
*
* @param var The variable binding
* @return null or the FactPattern found.
*/
public FactPattern getLHSParentFactPatternForBinding(final String var) {
if (this.lhs == null) {
return null;
}
for (int i = 0; i < this.lhs.length; i++) {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
final FactPattern p = (FactPattern) pat;
if (p.getBoundName() != null && var.equals(p.getBoundName())) {
return p;
}
for (int j = 0; j < p.getFieldConstraints().length; j++) {
FieldConstraint fc = p.getFieldConstraints()[j];
List<String> fieldBindings = getFieldBinding(fc);
if (fieldBindings.contains(var)) {
return p;
}
}
}
}
return null;
}
/**
* This will return the FactPattern that a variable is bound Eto.
*
* @param var The bound fact variable (NOT bound field).
* @return null or the FactPattern found.
*/
public FactPattern getLHSBoundFact(final String var) {
if (this.lhs == null) {
return null;
}
for (int i = 0; i < this.lhs.length; i++) {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
final FactPattern p = (FactPattern) pat;
if (p.getBoundName() != null && var.equals(p.getBoundName())) {
return p;
}
}
}
return null;
}
/**
* This will return a List<String> of all FactPattern bindings
*
* @return The bindings or an empty list if no bindings are found.
*/
public List<String> getLHSBoundFacts() {
if (this.lhs == null) {
return Collections.emptyList();
}
final List<String> list = new ArrayList<String>();
for (int i = 0; i < this.lhs.length; i++) {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
final FactPattern p = (FactPattern) pat;
if (p.getBoundName() != null) {
list.add(p.getBoundName());
}
}
}
return list;
}
/** This will get a list of all LHS bound variables, including bound fields.. */
public List<String> getAllLHSVariables() {
List<String> result = new ArrayList<String>();
for (int i = 0; i < this.lhs.length; i++) {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
FactPattern fact = (FactPattern) pat;
if (fact.isBound()) {
result.add(fact.getBoundName());
}
for (int j = 0; j < fact.getFieldConstraints().length; j++) {
FieldConstraint fc = fact.getFieldConstraints()[j];
if (fc instanceof SingleFieldConstraintEBLeftSide) {
SingleFieldConstraintEBLeftSide exp = (SingleFieldConstraintEBLeftSide) fc;
if (exp.getExpressionLeftSide() != null && exp.getExpressionLeftSide().isBound()) {
result.add(exp.getExpressionLeftSide().getBinding());
}
} else if (fc instanceof SingleFieldConstraint) {
SingleFieldConstraint con = (SingleFieldConstraint) fc;
if (con.isBound()) {
result.add(con.getFieldBinding());
}
if (con.getExpressionValue() != null && con.getExpressionValue().isBound()) {
result.add(con.getExpressionValue().getBinding());
}
}
}
}
}
return result;
}
/**
* Get the data-type associated with the binding
*
* @param var
* @return The data-type, or null if the binding could not be found
*/
public String getLHSBindingType(final String var) {
if (this.lhs == null) {
return null;
}
for (int i = 0; i < this.lhs.length; i++) {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
final FactPattern p = (FactPattern) pat;
if (p.isBound() && var.equals(p.getBoundName())) {
return p.getFactType();
}
for (FieldConstraint fc : p.getFieldConstraints()) {
String type = getFieldBinding(fc, var);
if (type != null) {
return type;
}
}
}
}
return null;
}
/**
* This uses a deceptively simple algorithm to determine what bound variables are in scope for a
* given constraint (including connectives). Does not take into account globals.
*/
public List<String> getBoundVariablesInScope(final BaseSingleFieldConstraint con) {
final List<String> result = new ArrayList<String>();
for (int i = 0; i < this.lhs.length; i++) {
IPattern pat = this.lhs[i];
if (pat instanceof FromCompositeFactPattern) {
pat = ((FromCompositeFactPattern) pat).getFactPattern();
}
if (pat instanceof FactPattern) {
final FactPattern fact = (FactPattern) pat;
if (fact.getConstraintList() != null) {
final FieldConstraint[] cons = fact.getConstraintList().getConstraints();
if (cons != null) {
for (int k = 0; k < cons.length; k++) {
FieldConstraint fc = cons[k];
if (fc instanceof SingleFieldConstraint) {
final SingleFieldConstraint c = (SingleFieldConstraint) fc;
if (c == con) {
return result;
}
if (c.getConnectives() != null) {
for (int j = 0; j < c.getConnectives().length; j++) {
if (con == c.getConnectives()[j]) {
return result;
}
}
}
if (c.isBound()) {
result.add(c.getFieldBinding());
}
}
}
}
if (fact.isBound()) {
result.add(fact.getBoundName());
}
} else {
if (fact.isBound()) {
result.add(fact.getBoundName());
}
}
}
}
return result;
}