TermNode.java

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package com.graphbuilder.math;

public abstract class TermNode extends Expression {

    protected String name = null;
    protected boolean negate = false;

    public TermNode(String name, boolean negate) {
        setName(name);
        setNegate(negate);
    }

    public boolean getNegate() {
        return negate;
    }

    public void setNegate(boolean b) {
        negate = b;
    }

    public String getName() {
        return name;
    }

    public void setName(String s) {
        if (s == null)
            throw new IllegalArgumentException("name cannot be null");

        if (!isValidName(s))
            throw new IllegalArgumentException("invalid name: " + s);

        name = s;
    }

    private static boolean isValidName(String s) {
        if (s.length() == 0) return false;

        char c = s.charAt(0);

        if (c >= '0' && c <= '9' || c == '.' || c == ',' || c == '(' || c == ')' || c == '^' || c == '*' || c == '/' || c == '+' || c == '-' || c == ' ' || c == '\t' || c == '\n')
            return false;

        for (int i = 1; i < s.length(); i++) {
            c = s.charAt(i);

            if (c == ',' || c == '(' || c == ')' || c == '^' || c == '*' || c == '/' || c == '+' || c == '-' || c == ' ' || c == '\t' || c == '\n')
                return false;
        }

        return true;
    }
}