@Override
public Expression caseOrExpression(OrExpression object) {
if (object.getRight() == null) return doSwitch(object.getLeft());
if (object.getLeft() == null) return doSwitch(object.getRight());
Expression left = doSwitch(object.getLeft());
Expression right = doSwitch(object.getRight());
if (areSemanticallyEqual(left, right)) return left;
if (left instanceof AndExpression) {
AndExpression leftAsAnd = (AndExpression) left;
if (areSemanticallyEqual(leftAsAnd.getLeft(), right)
|| areSemanticallyEqual(leftAsAnd.getRight(), right)) return right;
} else if (right instanceof AndExpression) {
AndExpression rightAsAnd = (AndExpression) right;
if (areSemanticallyEqual(rightAsAnd.getLeft(), left)
|| areSemanticallyEqual(rightAsAnd.getRight(), left)) return left;
}
if (left instanceof OrExpression) {
OrExpression leftAsOr = (OrExpression) left;
if (areSemanticallyEqual(leftAsOr.getLeft(), right)
|| areSemanticallyEqual(leftAsOr.getRight(), right)) return left;
} else if (right instanceof OrExpression) {
OrExpression rightAsOr = (OrExpression) right;
if (areSemanticallyEqual(rightAsOr.getLeft(), left)
|| areSemanticallyEqual(rightAsOr.getRight(), left)) return right;
}
object.setLeft(left);
object.setRight(right);
return object;
}
@Override
public Expression caseAndExpression(AndExpression object) {
if (object.getRight() == null) return doSwitch(object.getLeft());
if (object.getLeft() == null) return doSwitch(object.getRight());
Expression left = doSwitch(object.getLeft());
Expression right = doSwitch(object.getRight());
if (areSemanticallyEqual(left, right)) return left;
object.setLeft(left);
object.setRight(right);
return object;
}
public boolean areSemanticallyEqual(Expression left, Expression right) {
if (left.eClass() != right.eClass()) return false;
if (left instanceof OrExpression) {
OrExpression leftOrExpression = (OrExpression) left;
OrExpression rightOrExpression = (OrExpression) right;
return (areSemanticallyEqual(leftOrExpression.getLeft(), rightOrExpression.getLeft())
&& areSemanticallyEqual(leftOrExpression.getRight(), rightOrExpression.getRight()))
|| (areSemanticallyEqual(leftOrExpression.getRight(), rightOrExpression.getLeft())
&& areSemanticallyEqual(leftOrExpression.getLeft(), rightOrExpression.getRight()));
}
if (left instanceof AndExpression) {
AndExpression leftAndExpression = (AndExpression) left;
AndExpression rightAndExpression = (AndExpression) right;
return (areSemanticallyEqual(leftAndExpression.getLeft(), rightAndExpression.getLeft())
&& areSemanticallyEqual(leftAndExpression.getRight(), rightAndExpression.getRight()))
|| (areSemanticallyEqual(leftAndExpression.getRight(), rightAndExpression.getLeft())
&& areSemanticallyEqual(leftAndExpression.getLeft(), rightAndExpression.getRight()));
}
if (left instanceof NotExpression) {
return areSemanticallyEqual(
((NotExpression) left).getExpression(), ((NotExpression) right).getExpression());
}
if (left instanceof Comparison) {
Comparison leftComparison = (Comparison) left;
Comparison rightComparison = (Comparison) right;
return ((Comparison) left).getOperator().equals(rightComparison.getOperator())
&& areSemanticallyEqual(leftComparison.getLeft(), rightComparison.getLeft())
&& areSemanticallyEqual(leftComparison.getRight(), rightComparison.getRight());
}
if (left instanceof NumberLiteral) {
int leftValue = ((NumberLiteral) left).getValue();
int rightValue = ((NumberLiteral) right).getValue();
return leftValue == rightValue;
}
if (left instanceof MethodCall) {
String leftMethod = ((MethodCall) left).getValue();
String rightMethod = ((MethodCall) right).getValue();
return leftMethod.equals(rightMethod);
}
throw new IllegalStateException(left + " - " + right);
}