public BigDecimal getFirst() {
if (this.type == Type.VALUE) {
return this.value[0];
} else {
throw new IllegalStateException("Wrong type " + type.toString());
}
}
public boolean isLeftAssociative() {
if (this.type == Type.OPERATOR) {
if (this.operator == '^') return false;
else return true;
} else {
throw new IllegalStateException("Wrong type " + type.toString());
}
}
public int getPrecedence() {
if (this.type == Type.OPERATOR) {
switch (this.operator) {
case '^':
return 3;
case '*':
case '/':
return 2;
case '+':
case '-':
return 1;
default:
return -1;
}
} else if (this.type == Type.FUNCTION) {
return 4;
} else {
throw new IllegalStateException("Wrong type " + type.toString());
}
}