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package eu.dnetlib.data.transform;
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import java.util.List;
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import java.util.Optional;
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import com.google.common.base.Splitter;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.protobuf.Descriptors.EnumValueDescriptor;
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import com.google.protobuf.Descriptors.FieldDescriptor;
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import com.google.protobuf.GeneratedMessage;
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import com.google.protobuf.Message;
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import com.googlecode.protobuf.format.JsonFormat;
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import eu.dnetlib.pace.config.Type;
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import org.apache.commons.lang3.StringUtils;
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/**
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* AbstractProtoMapper provide common navigation methods on the protocolbuffers Messages.
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*
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* @author claudio
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*/
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public abstract class AbstractProtoMapper {
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private static final String COND_WRAPPER = "\\{|\\}";
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private static final String COND_SEPARATOR = "#";
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/** The Constant PATH_SEPARATOR. */
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private static final String PATH_SEPARATOR = "/";
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/**
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* Process multi path.
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*
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* @param proto
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* the proto
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* @param paths
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* the paths
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* @return the list
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*/
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protected List<Object> processMultiPath(final GeneratedMessage proto, final List<String> paths, final Type type) {
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final List<Object> response = Lists.newArrayList();
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for (final String pathElements : paths) {
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response.addAll(processPath(proto, pathElements, type));
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}
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return response;
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}
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/**
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* Process path.
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*
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* @param proto
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* the proto
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* @param path
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* the path
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* @return the list
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*/
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protected List<Object> processPath(final GeneratedMessage proto, final String path, final Type type) {
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return processPath(proto, Lists.newLinkedList(Splitter.on(PATH_SEPARATOR).trimResults().split(path)), type);
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}
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/**
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* Process path.
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*
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* @param proto
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* the proto
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* @param pathElements
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* the list
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* @return the list
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*/
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protected List<Object> processPath(final GeneratedMessage proto, final List<String> pathElements, final Type type) {
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final List<Object> response = Lists.newArrayList();
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if (pathElements.isEmpty()) throw new RuntimeException("ProtoBuf navigation path is empty");
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final String fieldPathCond = pathElements.get(0);
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final String fieldPath = StringUtils.substringBefore(fieldPathCond, "[");
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final String cond = getCondition(fieldPathCond);
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final Optional<FieldDescriptor> ofd = proto.getAllFields().keySet()
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.stream()
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.filter(fdef -> fdef.getName().equalsIgnoreCase(fieldPath))
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.findFirst();
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if (ofd.isPresent()) {
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final FieldDescriptor fd = ofd.get();
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if (fd.isRepeated()) {
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final int count = proto.getRepeatedFieldCount(fd);
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for (int i = 0; i < count; i++) {
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final Object field = proto.getRepeatedField(fd, i);
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response.addAll(generateFields(fd, field, pathElements, cond, type));
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}
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} else {
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final Object field = proto.getField(fd);
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response.addAll(generateFields(fd, field, pathElements, cond, type));
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}
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} //else throw new IllegalArgumentException("Invalid protobuf path (field not found): " + StringUtils.join(pathElements, ">") + "\nMessage:\n" + proto);
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return response;
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}
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/**
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* Generate fields.
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*
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* @param fd
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* the fd
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* @param field
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* the field
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* @param list
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* the list
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* @return the list
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*/
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private List<Object> generateFields(final FieldDescriptor fd, final Object field, final List<String> list, final String cond, final Type type) {
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final List<Object> res = Lists.newArrayList();
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if (field instanceof GeneratedMessage) {
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if (list.size() > 1) {
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if (StringUtils.isBlank(cond)) return processPath((GeneratedMessage) field, list.subList(1, list.size()), type);
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else {
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final List<String> condPath =
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Lists.newLinkedList(Splitter.on(COND_SEPARATOR).trimResults().split(StringUtils.substringBefore(cond, "=")));
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final String val = (String) Iterables.getOnlyElement(processPath((GeneratedMessage) field, condPath, type));
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final String condVal = StringUtils.substringAfter(cond, "=").replaceAll(COND_WRAPPER, "").trim();
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return val.equals(condVal) ? processPath((GeneratedMessage) field, list.subList(1, list.size()), type) : res;
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}
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}
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else if (Type.JSON.equals(type)) {
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final String json = JsonFormat.printToString((Message) field);
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res.add(json);
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return res;
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} else throw new RuntimeException("No primitive type found");
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} else {
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if (list.size() == 1) {
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switch (fd.getType()) {
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case ENUM:
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res.add(((EnumValueDescriptor) field).getName());
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break;
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default:
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res.add(field);
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break;
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}
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return res;
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}
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else throw new RuntimeException("Found a primitive type before the path end");
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}
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}
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private String getCondition(final String fieldPathCond) {
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return fieldPathCond.contains("[") ? StringUtils.substringAfter(fieldPathCond, "[").replace("]", "") : "";
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}
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}
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