D-Net

import static eu.dnetlib.miscutils.collections.MappedCollection.listMap;

import java.util.Collection;

import java.util.List;

import java.util.Map;

	@SuppressWarnings("unchecked")

	protected String getSingleField(final SolrDocument doc, final String fieldName) {

		Object value = doc.getFieldValue(fieldName);

		if (value instanceof Collection) return Iterables.getOnlyElement((Iterable<String>) value);

		return String.valueOf(value);

	}