EnvironmentPropertyProcessorProvider.java

/*
 * Copyright (c) 2002 Cunningham & Cunningham, Inc.
 * Copyright (c) 2009-2015 by Jochen Wierum & Cologne Intelligence
 *
 * This file is part of FitGoodies.
 *
 * FitGoodies is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * FitGoodies 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with FitGoodies.  If not, see <http://www.gnu.org/licenses/>.
 */

package de.cologneintelligence.fitgoodies.references;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EnvironmentPropertyProcessorProvider implements CellProcessorProvider {
	private static final Pattern PATTERN = Pattern.compile(
			"\\$\\{(?:system\\.)?getProperty\\(([^)]+)\\)\\}",
			Pattern.CASE_INSENSITIVE);

	@Override
	public boolean canProcess(String strippedText) {
		return strippedText != null && PATTERN.matcher(strippedText).find();
	}

	@Override
	public CellProcessor create(final String strippedText) {
		return new CellProcessor() {
			@Override
			public String preprocess() {
				Matcher matcher = PATTERN.matcher(strippedText);
				matcher.find();

				String property = System.getProperty(matcher.group(1));
				if (property == null) {
					property = "";
				}

				return strippedText.replaceAll(Pattern.quote(matcher.group(0)), property);
			}
		};
	}
}