/**
* Equality is by value.
*
* @param object The ConstraintIs object to compare to
* @return <code>true</code> if object is the same as this.
*/
public boolean equals(Object object) {
if (object == null) return false;
if (object == this) return true;
// Check that the given object is the correct class
if (!object.getClass().equals(this.getClass())) return false;
// Check each element.
ConstraintAssignment tmpConstraint = (ConstraintAssignment) object;
if (!context.equals(tmpConstraint.context) || var.equals(tmpConstraint.var)) return false;
// fudge the value comparison
boolean exprEq = false;
Object v1 = null;
Object v2 = null;
try {
v1 = expr.getValue();
try {
v2 = tmpConstraint.expr.getValue();
exprEq = v1.equals(v2);
} catch (QueryException e2) {
}
} catch (QueryException e) {
try {
v2 = tmpConstraint.expr.getValue();
} catch (QueryException e2) {
exprEq = true;
}
}
return exprEq;
}
/**
* Get all constraints which are variables. This method now uses the fourth element of the triple.
*
* @return A set containing all variable constraints.
*/
public Set<Variable> getVariables() {
if (variables == null) {
Set<Variable> v = new HashSet<Variable>(context.getVariables());
v.add(var);
variables = Collections.unmodifiableSet(v);
}
return variables;
}
/**
* Calculate a semi-unique integer for this object
*
* @return a semi-unique integer for this object
*/
public int hashCode() {
return context.hashCode() + var.hashCode() + expr.hashCode();
}