D-Net

package eu.dnetlib.functionality.index.utils;

import java.io.IOException;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerConfigurationException;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.TransformerFactoryConfigurationError;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.io.DocumentResult;

import org.dom4j.io.DocumentSource;

import org.dom4j.io.SAXReader;

import org.springframework.beans.factory.annotation.Required;

import org.springframework.core.io.Resource;

import eu.dnetlib.data.provision.index.rmi.IndexServiceException;

public class IndexSchemaFactory {

	private static final Log log = LogFactory.getLog(IndexSchemaFactory.class); // NOPMD by marko on 11/24/08 5:02 PM

	private final static String TEXT_FIELD_TYPE = "textFieldType";

	private Resource schemaTemplate;

	private String textFieldType;

	/**

	 * Transformer used to get the index schema.

	 */

	private Transformer transformer;

	public void init() throws TransformerConfigurationException, TransformerFactoryConfigurationError, DocumentException, IOException {

		transformer = TransformerFactory.newInstance().newTransformer(new DocumentSource(new SAXReader().read(getSchemaTemplate().getInputStream())));

		transformer.setParameter(TEXT_FIELD_TYPE, getTextFieldType());

	}

	/**

	 * @param fields

	 *            input document

	 * @return the application of the schemaXslt transformation to the docIn document

	 * @throws IndexServiceException

	 */

	public String getSchema(final Document fields) throws IndexServiceException {

		log.debug("default field type: " + getTextFieldType());

		log.debug("building schema from fields: \n" + fields.asXML() + "\n");

		final DocumentResult result = new DocumentResult();

		try {

			transformer.transform(new DocumentSource(fields), result);

			String xml = result.getDocument().asXML();

			log.debug("new index schema:\n" + xml);

			return xml;

		} catch (TransformerException e) {

			throw new IndexServiceException(e);

		}

	}

	@Required

	public void setSchemaTemplate(final Resource schemaTemplate) {

		this.schemaTemplate = schemaTemplate;

	}

	public Resource getSchemaTemplate() {

		return schemaTemplate;

	}

	@Required

	public void setTextFieldType(final String textFieldType) {

		this.textFieldType = textFieldType;

	}

	public String getTextFieldType() {

		return textFieldType;

	}

}