| /* |
| * 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.vxquery.datamodel.accessors; |
| |
| import org.apache.hyracks.data.std.api.AbstractPointable; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.primitive.IntegerPointable; |
| |
| public class AbstractSequencePointable extends AbstractPointable { |
| private static final int ENTRY_COUNT_SIZE = IntegerPointable.TYPE_TRAITS.getFixedLength(); |
| private static final int SLOT_SIZE = IntegerPointable.TYPE_TRAITS.getFixedLength(); |
| |
| public int getEntryCount() { |
| return getEntryCount(bytes, start); |
| } |
| |
| protected static int getEntryCount(byte[] bytes, int start) { |
| return IntegerPointable.getInteger(bytes, start); |
| } |
| |
| public void getEntry(int idx, IPointable pointer) { |
| int dataAreaOffset = getDataAreaOffset(bytes, start); |
| pointer.set(bytes, dataAreaOffset + getRelativeEntryStartOffset(idx), getEntryLength(idx)); |
| } |
| |
| static int getSlotValue(byte[] bytes, int start, int idx) { |
| return IntegerPointable.getInteger(bytes, getSlotArrayOffset(start) + idx * SLOT_SIZE); |
| } |
| |
| private int getRelativeEntryStartOffset(int idx) { |
| return idx == 0 ? 0 : getSlotValue(bytes, start, idx - 1); |
| } |
| |
| private int getEntryLength(int idx) { |
| return getSlotValue(bytes, start, idx) - getRelativeEntryStartOffset(idx); |
| } |
| |
| private static int getSlotArrayOffset(int start) { |
| return start + ENTRY_COUNT_SIZE; |
| } |
| |
| static int getDataAreaOffset(byte[] bytes, int start) { |
| return getSlotArrayOffset(start) + getEntryCount(bytes, start) * SLOT_SIZE; |
| } |
| } |