public boolean equals(Object object) {
if (!(object instanceof Expression)) {
return false;
}
Expression e = (Expression) object;
if (e.getType() != getType() || e.getOperandCount() != getOperandCount()) {
return false;
}
// compare operands
int len = e.getOperandCount();
for (int i = 0; i < len; i++) {
if (!Util.nullSafeEquals(e.getOperand(i), getOperand(i))) {
return false;
}
}
return true;
}
