DOIUtils.java

/*
 * Copyright 2017 Global Crop Diversity Trust
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.genesys.util;

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

public class DOIUtils {
	// 10. digit+ / not-whitespace+
	public static final Pattern DOI_PATTERN = Pattern.compile("^(10\\.[0-9]+)/(\\S+)$");

	public static boolean isValidDoi(String doi) {
		return DOI_PATTERN.matcher(doi).matches();
	}

	public static DOI parseDOI(String doi) throws InvalidDOIException {
		Matcher matcher = DOI_PATTERN.matcher(doi);
		if (matcher.find()) {
			return new DOI(matcher.group(1), matcher.group(2));
		} else {
			throw new InvalidDOIException(doi);
		}
	}

	/**
	 * Test if string is a DOI.
	 * 
	 * @param doi
	 * @throws InvalidDOIException
	 */
	public static void validateDoi(String doi) throws InvalidDOIException {
		if (!DOI_PATTERN.matcher(doi).matches()) {
			throw new InvalidDOIException(doi);
		}
	}

	public static class DOI {
		private String prefix;
		private String id;

		public DOI(String prefix, String id) {
			this.prefix = prefix;
			this.id = id;
		}
		
		public String getPrefix() {
			return prefix;
		}
		
		public String getId() {
			return id;
		}

		public String toString() {
			return "doi:" + prefix + "/" + id;
		};
	}
}