package eu.dnetlib.data.utility.cleaner;

import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.perf4j.StopWatch;
import org.perf4j.commonslog.CommonsLogStopWatch;
import org.springframework.beans.factory.annotation.Required;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;

public class XMLCleaningRule implements CleaningRule {

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

	List<XPATHCleaningRule> xpathRules = new ArrayList<XPATHCleaningRule>();

	public String evaluate(String text, String context) {
		try {

			StopWatch stopWatch = new CommonsLogStopWatch(log);
			DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
			Document doc = builder.parse(new InputSource(new StringReader(text)));

			stopWatch.stop("parsing.document");

			for (XPATHCleaningRule r : xpathRules) {
				StopWatch cleaningStopWatch = new CommonsLogStopWatch(log);
				r.applyXpathRule(doc, context);
				cleaningStopWatch.stop("cleaning.rule");
			}

			StopWatch serializeStopWatch = new CommonsLogStopWatch(log);
			StringWriter asXML = new StringWriter();

			Transformer transformer = TransformerFactory.newInstance().newTransformer();
			transformer.transform(new DOMSource(doc), new StreamResult(asXML));
			serializeStopWatch.stop("serialize");
			return asXML.toString();
		} catch (Exception e) {
			log.error("Error evaluating rule", e);
		}
		return "";
	}

	public List<XPATHCleaningRule> getXpathRules() {
		return xpathRules;
	}

	@Required
	public void setXpathRules(List<XPATHCleaningRule> xpathRules) {
		this.xpathRules = xpathRules;
	}

}