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package eu.dnetlib.oai;
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import java.util.List;
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import java.util.function.Function;
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import eu.dnetlib.oai.info.RecordInfo;
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/**
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* Interface for store used by the publisher. Different back-ends require different implementation.
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*
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* @param <T> class of the object that can be used to iterate results of a bulk request of records from the store.
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* @author alessia
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*/
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public interface PublisherStore<T extends Cursor> {
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/**
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* Returns the identifier of this store.
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*
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* @return a String that identifies this store
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*/
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String getId();
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/**
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* Gets the metadata format of this store.
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*
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* @return String
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*/
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String getMetadataFormat();
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/**
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* Gets the interpretation of this store.
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*
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* @return String
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*/
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String getInterpretation();
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/**
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* Gets the layout of this store.
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*
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* @return String
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*/
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String getLayout();
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/**
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* Retrieves the record with the given identifier from this store.
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*
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* @param recordId identifier of the record to retrieve
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* @return a RecordInfo instance representing the XML record
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*/
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RecordInfo getRecord(final String recordId);
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/**
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* Retrieves the record with the given identifier from this store and apply the given unary function before delivering.
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*
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* @param recordId identifier of the record to retrieve
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* @param unaryFunction mapping from String to String
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* @return a RecordInfo instance representing the XML record
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*/
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RecordInfo getRecord(final String recordId, final Function<String, String> unaryFunction);
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/**
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* Retrieves the records matching the given query string.
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*
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* @param queryString search criterion
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* @param bodyIncluded false to get only identifiers, true to also get the body of records
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* @param limit max number of records to return. 0 means no limit.
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* @return an instance of T that can be used to iterate over the results.
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*/
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T getRecords(final String queryString, final boolean bodyIncluded, final int limit);
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/**
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* Retrieves the records matching the given query string and apply the given unary function before delivering.
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*
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* @param queryString search criterion
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* @param unaryFunction mapping from String to String
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* @param bodyIncluded false to get only identifiers, true to also get the body of records
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* @param limit max number of records to return. 0 means no limit.
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* @return an instance of T that can be used to iterate over the results.
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*/
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T getRecords(final String queryString, final Function<String, String> unaryFunction, final boolean bodyIncluded, final int limit);
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/**
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* Gets informaton about the indices available on this store.
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*
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* @return a List with information about the indices of this store.
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*/
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List<PublisherField> getIndices();
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/**
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* Ensures the indices on this store.
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*/
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void ensureIndices();
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/**
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* Feeds the store with the given records.
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*
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* @param records XML records to store.
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* @param source String that identifies the record source.
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* @return the number of stored records.
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*/
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int feed(final Iterable<String> records, final String source);
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/**
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* Drops the content of the store.
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*/
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void drop();
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/**
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* Drops the elements matching the query from the store.
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*
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* @param queryString
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*/
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void drop(final String queryString);
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/**
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* Counts the number of records in this store.
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*
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* @return the size of the store.
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*/
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int count();
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/**
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* Counts the number of records in this store matching the query.
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*
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* @param queryString query
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* @return the size of the store.
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*/
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int count(final String queryString);
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}
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