D-Net

package eu.dnetlib.saxon.ext;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import net.sf.saxon.expr.XPathContext;

import net.sf.saxon.om.Sequence;

import net.sf.saxon.trans.XPathException;

import net.sf.saxon.value.SequenceType;

import net.sf.saxon.value.StringValue;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.stereotype.Component;

/**

 * Created by alessia on 24/02/17.

 */

@Component

public class ConvertFunction extends AbstractExtensionFunction {

	private static final Log log = LogFactory.getLog(ConvertFunction.class);

	@Override

	public String getName() {

		return "decade";

	}

	@Override

	public Sequence doCall(XPathContext context, Sequence[] arguments) throws XPathException {

		String expr = arguments[0].head().getStringValue();

		String decadeString = _decade(expr.trim());

		log.debug(expr + "--> " + decadeString);

		return new StringValue(decadeString);

	}

	@Override

	public int getMinimumNumberOfArguments() {

		return 1;

	}

	@Override

	public int getMaximumNumberOfArguments() {

		return 1;

	}

	@Override

	public SequenceType[] getArgumentTypes() {

		return new SequenceType[] { SequenceType.SINGLE_STRING };

	}

	@Override

	public SequenceType getResultType(SequenceType[] suppliedArgumentTypes) {

		return SequenceType.SINGLE_STRING;

	}

	private String _decade(String s) {

		Matcher m1 = Pattern.compile("(\\d\\d\\d)\\d").matcher(s);

		if (m1.find()) {

			String part = m1.group(1);

			return part + "0-" + part + "9";

		}

		Matcher m2 = Pattern.compile("(\\d)\\d").matcher(s);

		if (m2.find()) {

			String part = m2.group(1);

			return "19" + part + "0-19" + part + "9";

		}

		return "n/a";

	}

}