Retrieve field Value from Custom Document Type of Liferay

The below code helps you to get the field values from the custom document type of Liferay.

import com.liferay.portlet.documentlibrary.model.DLFileEntry;
import com.liferay.portlet.documentlibrary.model.DLFileEntryMetadata;
import com.liferay.portlet.documentlibrary.model.DLFileEntryType;
import com.liferay.portlet.documentlibrary.model.DLFileVersion;
import com.liferay.portlet.documentlibrary.model.DLFolder;
import com.liferay.portlet.documentlibrary.model.DLFolderConstants;
import com.liferay.portlet.documentlibrary.model.DLFileEntry;
import com.liferay.portlet.documentlibrary.model.DLFileEntryMetadata;
import com.liferay.portlet.documentlibrary.model.DLFileEntryType;
import com.liferay.portlet.documentlibrary.model.DLFileVersion;
import com.liferay.portlet.documentlibrary.model.DLFolder;
import com.liferay.portlet.documentlibrary.model.DLFolderConstants;

    public static String getFieldValue(DLFileEntry fileEntry,String name){
    String feildValue = StringPool.BLANK;
    try {
     DLFileEntryType dlFileEntryType = DLFileEntryTypeLocalServiceUtil.getFileEntryType(fileEntry.getFileEntryTypeId());
     List ddmStructures = dlFileEntryType.getDDMStructures();
     if(Validator.isNotNull(ddmStructures)){
  DDMStructure ddmStructure = ddmStructures.get(0);
     
       DLFileVersion dlFileVersion = fileEntry.getFileVersion();
       DLFileEntryMetadata dlFileEntryMetadata = DLFileEntryMetadataLocalServiceUtil.getFileEntryMetadata(ddmStructure.getStructureId(), dlFileVersion.getFileVersionId());
     
       Fields fields = StorageEngineUtil.getFields(dlFileEntryMetadata.getDDMStorageId());
       if(Validator.isNotNull(fields.get(name))){
        feildValue= GetterUtil.getString(fields.get(name).getValue());
       }
     }
    } catch (PortalException | SystemException e) {
  _log.error(e.getMessage(), e);
    }
    return feildValue;
    }