package org.yaz4j;
+import java.util.ArrayList;
import java.util.Iterator;
+import java.util.List;
import java.util.NoSuchElementException;
import org.yaz4j.exception.ZoomException;
import org.yaz4j.jni.SWIGTYPE_p_ZOOM_record_p;
import org.yaz4j.jni.SWIGTYPE_p_ZOOM_resultset_p;
+import org.yaz4j.jni.SWIGTYPE_p_p_ZOOM_record_p;
import org.yaz4j.jni.yaz4jlib;
/**
* This class represents a "buffered handle" to the result set created on the
- * server and thus retrieving records may invlove a request to the server if
+ * server and thus retrieving records may involve a request to the server if
* those records are not locally cached. Details on how to configure the retrieval
* (present) process are available in the YAZ manual
*
* @see <a href="http://www.indexdata.com/yaz/doc/zoom.resultsets.html">YAZ ZOOM result sets</a>
*
- * Becacuse of the server misbehaviour or errors during retrieval the
+ * Because of server misbehavior or errors during retrieval the
* "getRecord" method may either return null or throw exceptions, even when the
* index of retrieved records lies within the bounds of the set. Client
* code should be prepared for such situations.
*
* This class implements the iterable interface and as such can be used within
- * foreach loops, it's important to note however that in this case the errors
- * during retrieval will be masked with standard NoSuchElementExceptions
+ * foreach loops, it's important to note, however, that in this case the errors
+ * during retrieval will be masked with standard NoSuchElementExceptions.
*
* @author jakub
*/
}
return new Record(record, this);
}
+
+ /**
+ * Retrieve a collection of records at once. If a record cannot be retrieved,
+ * it is omitted from the list (thus the list size may be smaller than 'count').
+ * @param start start index within the result set
+ * @param count number of records to retrieve
+ * @return
+ * @throws ZoomException raised in case of protocol errors
+ */
+ public List<Record> getRecords(long start, int count) throws ZoomException {
+ List<Record> out = new ArrayList<Record>(count);
+ SWIGTYPE_p_p_ZOOM_record_p recs = yaz4jlib.new_zoomRecordArray(count);
+ yaz4jlib.ZOOM_resultset_records(resultSet, recs, start, count);
+ for (int i = 0; i < count; i++) {
+ SWIGTYPE_p_ZOOM_record_p record =
+ yaz4jlib.zoomRecordArray_getitem(recs, i);
+ if (record == null) {
+ continue;
+ }
+ int errorCode = yaz4jlib.ZOOM_record_error(record, null, null, null);
+ if (errorCode != 0) {
+ throw new ZoomException("Record excpetion, code " + errorCode);
+ }
+ out.add(new Record(record, this));
+ }
+ return out;
+ }
@Override
public Iterator<Record> iterator() {
};
}
+ /**
+ *
+ * @param type
+ * @param spec
+ * @return
+ * @throws ZoomException
+ */
+ public ResultSet sort(String type, String spec) throws ZoomException {
+ int ret = yaz4jlib.ZOOM_resultset_sort1(resultSet, type, spec);
+ if (ret != 0) throw new ZoomException("Sorting resultset failed");
+ return this;
+ }
+
public long getHitCount() {
return size;
}