| /* |
| * 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.jsonitem; |
| |
| import org.apache.hyracks.api.dataflow.value.ITypeTraits; |
| import org.apache.hyracks.data.std.api.AbstractPointable; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.api.IPointableFactory; |
| import org.apache.hyracks.data.std.primitive.IntegerPointable; |
| import org.apache.hyracks.data.std.primitive.VoidPointable; |
| |
| public class ArrayPointable extends AbstractPointable { |
| private static final int ENTRY_COUNT_SIZE = IntegerPointable.TYPE_TRAITS.getFixedLength(); |
| private static final int SLOT_SIZE = IntegerPointable.TYPE_TRAITS.getFixedLength(); |
| public static final IPointableFactory FACTORY = new IPointableFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ITypeTraits getTypeTraits() { |
| return VoidPointable.TYPE_TRAITS; |
| } |
| |
| @Override |
| public IPointable createPointable() { |
| return new ArrayPointable(); |
| } |
| }; |
| |
| public int getEntryCount() { |
| return getEntryCount(bytes, start); |
| } |
| |
| private static int getEntryCount(byte[] bytes, int start) { |
| return IntegerPointable.getInteger(bytes, start); |
| } |
| |
| public void getEntry(int idx, IPointable pointer) { |
| int dataStart = getDataStart(bytes, start); |
| pointer.set(bytes, dataStart + getRelativeEntryStartOffset(idx), getEntryLength(idx)); |
| } |
| |
| private static int getEntryOffsetValue(byte[] bytes, int start, int idx) { |
| return IntegerPointable.getInteger(bytes, getOffsetsStart(start) + idx * SLOT_SIZE); |
| } |
| |
| private int getRelativeEntryStartOffset(int idx) { |
| return idx == 0 ? 0 : getEntryOffsetValue(bytes, start, idx - 1); |
| } |
| |
| private int getEntryLength(int idx) { |
| return getEntryOffsetValue(bytes, start, idx) - getRelativeEntryStartOffset(idx); |
| } |
| |
| private static int getOffsetsStart(int start) { |
| return start + ENTRY_COUNT_SIZE; |
| } |
| |
| private static int getDataStart(byte[] bytes, int start) { |
| return getOffsetsStart(start) + getEntryCount(bytes, start) * SLOT_SIZE; |
| } |
| } |