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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*
* Copyright (c) 2005, Graph Builder
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Graph Builder nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.graphbuilder.math;

/**
A node of an expression tree that represents a variable or a function.
*/
public abstract class TermNode extends Expression {

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

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

	/**
	Returns true if the term should negate the result before returning it in the eval method.
	*/
	public boolean getNegate() {
		return negate;
	}

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

	/**
	Returns the name of the term.
	*/
	public String getName() {
		return name;
	}

	/**
	Sets the name of the term.  Valid names must not begin with a digit or a decimal, and must not contain
	round brackets, operators, commas or whitespace.

	@throws IllegalArgumentException If the name is null or invalid.
	*/
	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;
	}
}