| /* |
| * 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.asterix.om.pointables; |
| |
| import org.apache.asterix.common.exceptions.AsterixException; |
| import org.apache.asterix.om.pointables.base.DefaultOpenFieldType; |
| import org.apache.asterix.om.pointables.base.IVisitablePointable; |
| import org.apache.asterix.om.types.AOrderedListType; |
| import org.apache.asterix.om.types.ATypeTag; |
| import org.apache.asterix.om.types.EnumDeserializer; |
| import org.apache.asterix.om.types.IAType; |
| import org.apache.asterix.om.types.TypeTagUtil; |
| import org.apache.asterix.om.util.container.IObjectFactory; |
| import org.apache.asterix.om.util.container.IObjectPool; |
| import org.apache.asterix.om.util.container.ListObjectPool; |
| |
| /** |
| * This class is the ONLY place to create IVisitablePointable object instances, |
| * to enforce use of an object pool. |
| */ |
| public class PointableAllocator { |
| |
| private IObjectPool<IVisitablePointable, IAType> flatValueAllocator = new ListObjectPool<IVisitablePointable, IAType>( |
| AFlatValuePointable.FACTORY); |
| private IObjectPool<IVisitablePointable, IAType> recordValueAllocator = new ListObjectPool<IVisitablePointable, IAType>( |
| ARecordVisitablePointable.FACTORY); |
| private IObjectPool<IVisitablePointable, IAType> listValueAllocator = new ListObjectPool<IVisitablePointable, IAType>( |
| AListVisitablePointable.FACTORY); |
| private IObjectPool<AOrderedListType, IAType> orederedListTypeAllocator = new ListObjectPool<AOrderedListType, IAType>( |
| new IObjectFactory<AOrderedListType, IAType>() { |
| @Override |
| public AOrderedListType create(IAType type) { |
| return new AOrderedListType(type, type.getTypeName() + "OrderedList"); |
| } |
| }); |
| private IObjectPool<AOrderedListType, IAType> unorederedListTypeAllocator = new ListObjectPool<AOrderedListType, IAType>( |
| new IObjectFactory<AOrderedListType, IAType>() { |
| @Override |
| public AOrderedListType create(IAType type) { |
| return new AOrderedListType(type, type.getTypeName() + "UnorderedList"); |
| } |
| }); |
| |
| public IVisitablePointable allocateEmpty() { |
| return flatValueAllocator.allocate(null); |
| } |
| |
| /** |
| * This method should ONLY be used for long lasting IVisitablePointable. |
| * |
| * @return |
| * a generic type IVisitablePointable. |
| */ |
| public static IVisitablePointable allocateUnrestableEmpty() { |
| return AFlatValuePointable.FACTORY.create(null); |
| } |
| |
| /** |
| * allocate closed part value pointable |
| * |
| * @param type |
| * @return the pointable object |
| */ |
| public IVisitablePointable allocateFieldValue(IAType type) { |
| if (type == null) |
| return flatValueAllocator.allocate(null); |
| else if (type.getTypeTag().equals(ATypeTag.RECORD)) |
| return recordValueAllocator.allocate(type); |
| else if (type.getTypeTag().equals(ATypeTag.UNORDEREDLIST) || type.getTypeTag().equals(ATypeTag.ORDEREDLIST)) |
| return listValueAllocator.allocate(type); |
| else |
| return flatValueAllocator.allocate(null); |
| } |
| |
| /** |
| * allocate open part value pointable |
| * |
| * @param typeTag |
| * @return the pointable object |
| */ |
| public IVisitablePointable allocateFieldValue(ATypeTag typeTag, byte[] b, int offset) throws AsterixException { |
| if (typeTag == null) |
| return flatValueAllocator.allocate(null); |
| else if (typeTag.equals(ATypeTag.RECORD)) |
| return recordValueAllocator.allocate(DefaultOpenFieldType.NESTED_OPEN_RECORD_TYPE); |
| else if (typeTag.equals(ATypeTag.UNORDEREDLIST)) { |
| ATypeTag listItemType = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(b[offset]); |
| if (listItemType == ATypeTag.ANY) |
| return listValueAllocator.allocate(DefaultOpenFieldType.NESTED_OPEN_AUNORDERED_LIST_TYPE); |
| else { |
| if (listItemType.isDerivedType()) |
| return allocateFieldValue(listItemType, b, offset + 1); |
| else |
| return listValueAllocator.allocate( |
| unorederedListTypeAllocator.allocate(TypeTagUtil.getBuiltinTypeByTag(listItemType))); |
| } |
| } else if (typeTag.equals(ATypeTag.ORDEREDLIST)) { |
| ATypeTag listItemType = EnumDeserializer.ATYPETAGDESERIALIZER.deserialize(b[offset]); |
| if (listItemType == ATypeTag.ANY) |
| return listValueAllocator.allocate(DefaultOpenFieldType.NESTED_OPEN_AORDERED_LIST_TYPE); |
| else { |
| if (listItemType.isDerivedType()) |
| return allocateFieldValue(listItemType, b, offset + 1); |
| else |
| return listValueAllocator.allocate( |
| orederedListTypeAllocator.allocate(TypeTagUtil.getBuiltinTypeByTag(listItemType))); |
| } |
| } else |
| return flatValueAllocator.allocate(null); |
| } |
| |
| public IVisitablePointable allocateListValue(IAType type) { |
| return listValueAllocator.allocate(type); |
| } |
| |
| public IVisitablePointable allocateRecordValue(IAType type) { |
| return recordValueAllocator.allocate(type); |
| } |
| |
| public void reset() { |
| flatValueAllocator.reset(); |
| recordValueAllocator.reset(); |
| listValueAllocator.reset(); |
| } |
| } |