RewriteParser.java

/*******************************************************************************
 * LastCalc - The last calculator you'll ever need
 * Copyright (C) 2011, 2012 Uprizer Labs LLC
 * 
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU Affero General Public License as published 
 * by the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR 
 * PURPOSE.  See the GNU Affero General Public License for more 
 * details.
 ******************************************************************************/
package com.lastcalc.parsers;

import java.util.ArrayList;

import com.lastcalc.TokenList;


public class RewriteParser extends Parser {

	private static final long serialVersionUID = 7536991519287899564L;
	private final TokenList template;
	private final TokenList to;

	public RewriteParser(final Object from, final Object to) {
		if (from instanceof ArrayList) {
			template = TokenList.create((ArrayList<Object>) from);
		} else {
			template = TokenList.createD(from);
		}
		if (to instanceof ArrayList) {
			this.to = TokenList.create((ArrayList<Object>) to);
		} else {
			this.to = TokenList.createD(to);
		}
	}

	@Override
	public TokenList getTemplate() {
		return template;
	}

	@Override
	public ParseResult parse(final TokenList tokens, final int templatePos) {
		return ParseResult.success(tokens.replaceWithTokenList(templatePos, templatePos + template.size(), to));
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((template == null) ? 0 : template.hashCode());
		result = prime * result + ((to == null) ? 0 : to.hashCode());
		return result;
	}

	@Override
	public boolean equals(final Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (!(obj instanceof RewriteParser))
			return false;
		final RewriteParser other = (RewriteParser) obj;
		if (template == null) {
			if (other.template != null)
				return false;
		} else if (!template.equals(other.template))
			return false;
		if (to == null) {
			if (other.to != null)
				return false;
		} else if (!to.equals(other.to))
			return false;
		return true;
	}


}