1 files changed, 140 insertions, 0 deletions
diff --git a/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/RowBasedSet.java b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/RowBasedSet.java
new file mode 100644
index 0000000000..a0ee2109dc
--- /dev/null
+++ b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/cli/RowBasedSet.java
@@ -0,0 +1,140 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hive.service.cli;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.hive.service.cli.thrift.TColumnValue;
+import org.apache.hive.service.cli.thrift.TRow;
+import org.apache.hive.service.cli.thrift.TRowSet;
+
+/**
+ * RowBasedSet
+ */
+public class RowBasedSet implements RowSet {
+
+  private long startOffset;
+
+  private final Type[] types; // non-null only for writing (server-side)
+  private final RemovableList<TRow> rows;
+
+  public RowBasedSet(TableSchema schema) {
+    types = schema.toTypes();
+    rows = new RemovableList<TRow>();
+  }
+
+  public RowBasedSet(TRowSet tRowSet) {
+    types = null;
+    rows = new RemovableList<TRow>(tRowSet.getRows());
+    startOffset = tRowSet.getStartRowOffset();
+  }
+
+  private RowBasedSet(Type[] types, List<TRow> rows, long startOffset) {
+    this.types = types;
+    this.rows = new RemovableList<TRow>(rows);
+    this.startOffset = startOffset;
+  }
+
+  @Override
+  public RowBasedSet addRow(Object[] fields) {
+    TRow tRow = new TRow();
+    for (int i = 0; i < fields.length; i++) {
+      tRow.addToColVals(ColumnValue.toTColumnValue(types[i], fields[i]));
+    }
+    rows.add(tRow);
+    return this;
+  }
+
+  @Override
+  public int numColumns() {
+    return rows.isEmpty() ? 0 : rows.get(0).getColVals().size();
+  }
+
+  @Override
+  public int numRows() {
+    return rows.size();
+  }
+
+  public RowBasedSet extractSubset(int maxRows) {
+    int numRows = Math.min(numRows(), maxRows);
+    RowBasedSet result = new RowBasedSet(types, rows.subList(0, numRows), startOffset);
+    rows.removeRange(0, numRows);
+    startOffset += numRows;
+    return result;
+  }
+
+  public long getStartOffset() {
+    return startOffset;
+  }
+
+  public void setStartOffset(long startOffset) {
+    this.startOffset = startOffset;
+  }
+
+  public int getSize() {
+    return rows.size();
+  }
+
+  public TRowSet toTRowSet() {
+    TRowSet tRowSet = new TRowSet();
+    tRowSet.setStartRowOffset(startOffset);
+    tRowSet.setRows(new ArrayList<TRow>(rows));
+    return tRowSet;
+  }
+
+  @Override
+  public Iterator<Object[]> iterator() {
+    return new Iterator<Object[]>() {
+
+      final Iterator<TRow> iterator = rows.iterator();
+      final Object[] convey = new Object[numColumns()];
+
+      @Override
+      public boolean hasNext() {
+        return iterator.hasNext();
+      }
+
+      @Override
+      public Object[] next() {
+        TRow row = iterator.next();
+        List<TColumnValue> values = row.getColVals();
+        for (int i = 0; i < values.size(); i++) {
+          convey[i] = ColumnValue.toColumnValue(values.get(i));
+        }
+        return convey;
+      }
+
+      @Override
+      public void remove() {
+        throw new UnsupportedOperationException("remove");
+      }
+    };
+  }
+
+  private static class RemovableList<E> extends ArrayList<E> {
+    public RemovableList() { super(); }
+    public RemovableList(List<E> rows) { super(rows); }
+    @Override
+    public void removeRange(int fromIndex, int toIndex) {
+      super.removeRange(fromIndex, toIndex);
+    }
+  }
+}