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EZID Service Library

EZID is a service for creating and managing unique identifiers for use in scholarly publishing that is provided by the California Digital Library. This software library, ezid, provides a Java class that encapsulates the EZID service to simplify writing client applications that use the EZID service. ezid provides methods for authenticating against the EZID service and then managing identifiers. Using the service requires an account with the EZID service. For more information, see: http://ezid.cdlib.org/doc/apidoc.html

Once you have added the library to your project classpath (see below), you can generate identifiers with EZID with simple Java calls. Here's a simple example to mint a new identifier using a DataCite 4.0 compliant metadata file in the current directory:

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import edu.ucsb.nceas.ezid.EZIDService;
import edu.ucsb.nceas.ezid.EZIDException;

public class EZIDExample {
    public static void main(String args[]) {
        try {
            String USERNAME = "apitest";
            String PASSWORD = "apitest";
            String DOISHOULDER = "doi:10.5072/FK2";

            EZIDService ezid = new EZIDService();
            ezid.login(USERNAME, PASSWORD);

            HashMap<String, String> metadata = new HashMap<String, String>();
            String xml = new String(Files.readAllBytes((Paths.get("datacite.xml"))));
            metadata.put("datacite", xml);
            String testId = ezid.mintIdentifier(DOISHOULDER, metadata);
            System.out.println("Generated: " + testId);
        } catch (EZIDException e) {
            System.err.println("Identifier minting failed: " + e.getMessage());
        } catch (IOException e) {
            System.err.println("Reading DataCiteXML failed: " + e.getMessage());
        }
    }
}

See the javadoc documentation for an overview of usage, as well as the EZIDServiceTest.java JUnit class for more examples of usage.

See the License section below and LICENSE.txt for the details of distributing this software.

Contributors

Using the library

To use the library in your Java application, you can add it to your pom.xml configuration if you are using Maven. You can access the ezid jar files through Maven by adding the appropriate maven repository to your pom. Something like this snippet should work:

    ...
    <repositories>
        <repository>
            <id>dataone.org</id>
            <url>http://dev-testing.dataone.org/maven</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>
    <dependencies>
    	<dependency>
    		<groupId>edu.ucsb.nceas</groupId>
			<artifactId>ezid</artifactId>
			<version>1.0.3</version>
			<type>jar</type>
    	</dependency>
    </dependencies>

We plan to publish the ezid artifacts to Maven Central repositories, but have not gotten there yet.

Building the library

The library is a standard Maven2 project. To build the library, install Maven2, and then run:

$ mvn package

which will create the jar file in the target directory. The jar file can then be included in applications that wish to access EZID.

Contact us: knb-help@nceas.ucsb.edu

Contributions

We welcome contributions to the project, and will incorporate pull requests after code review as long as the code requests are licensed acceptably and provide improvements that would generally be useful to the community of EZID users. Please submit pull request via GitHub.

Issue Tracking

Bugs, new features, and comments on the EZID library are handled through the ezid issue tracker.

License

This work was created by the National Center for Ecological Analysis and
Synthesis at the University of California Santa Barbara (UCSB).

  Copyright 2011-2104 Regents of the University of California

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.

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Implementation of the EZID identifier services in a Java library

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