| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.storage.am.btree.impls; |
| |
| import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits; |
| import edu.uci.ics.hyracks.storage.am.btree.api.IPrefixSlotManager; |
| import edu.uci.ics.hyracks.storage.am.btree.frames.BTreeFieldPrefixNSMLeafFrame; |
| import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexFrame; |
| import edu.uci.ics.hyracks.storage.am.common.tuples.TypeAwareTupleReference; |
| |
| public class FieldPrefixPrefixTupleReference extends TypeAwareTupleReference { |
| |
| public FieldPrefixPrefixTupleReference(ITypeTraits[] typeTraits) { |
| super(typeTraits); |
| } |
| |
| // assumes tuple index refers to prefix tuples |
| @Override |
| public void resetByTupleIndex(ITreeIndexFrame frame, int tupleIndex) { |
| BTreeFieldPrefixNSMLeafFrame concreteFrame = (BTreeFieldPrefixNSMLeafFrame) frame; |
| IPrefixSlotManager slotManager = concreteFrame.getSlotManager(); |
| int prefixSlotOff = slotManager.getPrefixSlotOff(tupleIndex); |
| int prefixSlot = concreteFrame.getBuffer().getInt(prefixSlotOff); |
| setFieldCount(slotManager.decodeFirstSlotField(prefixSlot)); |
| tupleStartOff = slotManager.decodeSecondSlotField(prefixSlot); |
| buf = concreteFrame.getBuffer(); |
| resetByTupleOffset(buf, tupleStartOff); |
| } |
| } |