ORG.oclc.oai.server.crosswalk.XML2oai_dc Maven / Gradle / Ivy

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/**
 * Copyright 2006 OCLC Online Computer Library Center 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.oclc.oai.server.crosswalk;

import java.util.Properties;
import ORG.oclc.oai.server.verb.CannotDisseminateFormatException;

/**
 * Convert native "item" to oai_dc. In this case, the native "item"
 * is assumed to already be formatted as an OAI  element,
 * with the possible exception that multiple metadataFormats may
 * be present in the  element. The "crosswalk", merely
 * involves pulling out the one that is requested.
 */
public class XML2oai_dc extends Crosswalk {
    private static final String elementName = "oai_dc:dc";
    private static final String elementStart = "<" + elementName;
    private static final String elementEnd = elementName + ">";
	
    /**
     * The constructor assigns the schemaLocation associated with this crosswalk. Since
     * the crosswalk is trivial in this case, no properties are utilized.
     *
     * @param properties properties that are needed to configure the crosswalk.
     */
    public XML2oai_dc(Properties properties) {
	super("http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd");
    }

    /**
     * Can this nativeItem be represented in DC format?
     * @param nativeItem a record in native format
     * @return true if DC format is possible, false otherwise.
     */
    public boolean isAvailableFor(Object nativeItem) {
	String fullItem = (String)nativeItem;
	if ((fullItem.indexOf(elementStart)) >= 0)
	    return true;
	return false;
    }

    /**
     * Perform the actual crosswalk.
     *
     * @param nativeItem the native "item". In this case, it is
     * already formatted as an OAI  element, with the
     * possible exception that multiple metadataFormats are
     * present in the  element.
     * @return a String containing the XML to be stored within the  element.
     * @exception CannotDisseminateFormatException nativeItem doesn't support this format.
     */
    public String createMetadata(Object nativeItem)
	throws CannotDisseminateFormatException {
	String fullItem = (String)nativeItem;

	int startOffset = fullItem.indexOf(elementStart);
	if (startOffset == -1) {
	    throw new CannotDisseminateFormatException(getSchemaLocation());
	}
	int endOffset = fullItem.indexOf(elementEnd) + elementEnd.length();
	return fullItem.substring(startOffset, endOffset);
    }
}