GetRecord.java

/*
 *  -------------------------------------------------------------------------
 *  Copyright 2006 OCLC, Online Computer Library Center
 *  Copyright 2014 
 *  Centre for Information Modeling - Austrian Centre for Digital Humanities
 *
 *  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.emile.cirilo.oai;

import java.io.IOException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;
import org.xml.sax.SAXException;

/**
 * This class represents an GetRecord response on either the server or
 * on the client
 *
 * @author Jeffrey A. Young, OCLC Online Computer Library Center
 */
public class GetRecord extends HarvesterVerb {
    /**
     * Mock object constructor (for unit testing purposes)
     */
    public GetRecord() {
        super();
    }
    
    /**
     * Client-side GetRecord verb constructor
     *
     * @param baseURL the baseURL of the server to be queried
     * @exception MalformedURLException the baseURL is bad
     * @exception SAXException the xml response is bad
     * @exception IOException an I/O error occurred
     */
    public GetRecord(String baseURL, String identifier, String metadataPrefix)
    throws IOException, ParserConfigurationException, SAXException,
    TransformerException {
        super(getRequestURL(baseURL, identifier, metadataPrefix));
    }
    
    /**
     * Get the oai:identifier from the oai:header
     * @return the oai:identifier as a String
     * @throws TransformerException
     * @throws NoSuchFieldException
     */
    public String getIdentifier()
    throws TransformerException, NoSuchFieldException {
        if (SCHEMA_LOCATION_V2_0.equals(getSchemaLocation())) {
            return getSingleString("/oai20:OAI-PMH/oai20:GetRecord/oai20:record/oai20:header/oai20:identifier");
        } else if (SCHEMA_LOCATION_V1_1_GET_RECORD.equals(getSchemaLocation())) {
            return getSingleString("/oai11_GetRecord:GetRecord/oai11_GetRecord:record/oai11_GetRecord:header/oai11_GetRecord:identifier");
        } else {
            throw new NoSuchFieldException(getSchemaLocation());
        }
    }
    
    /**
     * Construct the query portion of the http request
     *
     * @return a String containing the query portion of the http request
     */
    private static String getRequestURL(String baseURL, String identifier, String metadataPrefix) {
        StringBuffer requestURL =  new StringBuffer(baseURL);
        requestURL.append("?verb=GetRecord");
        requestURL.append("&identifier=").append(identifier);
        requestURL.append("&metadataPrefix=").append(metadataPrefix);
        return requestURL.toString();
    }
}