| /* |
| * 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.nodes; |
| |
| import org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.atomic.CodedQNamePointable; |
| |
| import org.apache.hyracks.api.dataflow.value.ITypeTraits; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.api.IPointableFactory; |
| import org.apache.hyracks.data.std.primitive.BytePointable; |
| import org.apache.hyracks.data.std.primitive.IntegerPointable; |
| import org.apache.hyracks.data.std.primitive.VoidPointable; |
| |
| /* |
| * Element { |
| * ElementHeader header; |
| * NamePtr namePtr; |
| * NamePtr typePtr?; |
| * LocalNodeId nodeId?; |
| * NamespaceChunk nsChunk?; |
| * Sequence attrChunk?; |
| * Sequence childrenChunk?; |
| * } |
| * |
| * ElementHeader (padded) { |
| * bit nsChunkExists; |
| * bit attrChunkExists; |
| * bit childrenChunkExists; |
| * } |
| * |
| * NamePtr { |
| * int[3] stringPtrs; |
| * } |
| * |
| * LocalNodeId { |
| * int32 id; |
| * } |
| * |
| * NamespaceChunk { |
| * byte[size] chunkSizeInBytes; // size = decode(ElementHeader.nsChunkSizeSize) |
| * NamePtr[2][chunkSizeInBytes / (sizeof(NamePtr) * 2)] namespaces; |
| * } |
| */ |
| public class ElementNodePointable extends AbstractNodePointable { |
| public static final byte NS_CHUNK_EXISTS_MASK = (0x1 << 0); |
| public static final byte ATTRIBUTES_CHUNK_EXISTS_MASK = (0x1 << 1); |
| public static final byte CHILDREN_CHUNK_EXISTS_MASK = (0x1 << 2); |
| |
| private static final int HEADER_SIZE = 1; |
| private static final int LOCAL_NODE_ID_SIZE = 4; |
| private static final int NS_ENTRY_SIZE = 4 * 2; |
| private static final int NS_CHUNK_SIZE_SIZE = 4; |
| 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 ElementNodePointable(); |
| } |
| }; |
| |
| public boolean nsChunkExists() { |
| return (getHeader() & NS_CHUNK_EXISTS_MASK) != 0; |
| } |
| |
| public boolean attributesChunkExists() { |
| return (getHeader() & ATTRIBUTES_CHUNK_EXISTS_MASK) != 0; |
| } |
| |
| public boolean childrenChunkExists() { |
| return (getHeader() & CHILDREN_CHUNK_EXISTS_MASK) != 0; |
| } |
| |
| public void getName(CodedQNamePointable name) { |
| name.set(bytes, getNameOffset(), getNameSize()); |
| } |
| |
| public void getTypeName(NodeTreePointable nodeTree, CodedQNamePointable typeName) { |
| if (nodeTree.typeExists()) { |
| typeName.set(bytes, getTypeOffset(), getTypeSize(nodeTree)); |
| } else { |
| typeName.set(null, -1, -1); |
| } |
| } |
| |
| public int getLocalNodeId(NodeTreePointable nodeTree) { |
| return nodeTree.nodeIdExists() ? IntegerPointable.getInteger(bytes, getLocalNodeIdOffset(nodeTree)) : -1; |
| } |
| |
| public int getNamespaceEntryCount(NodeTreePointable nodeTree) { |
| return nsChunkExists() ? IntegerPointable.getInteger(bytes, getNamespaceChunkOffset(nodeTree)) : 0; |
| } |
| |
| public int getNamespacePrefixCode(NodeTreePointable nodeTree, int nsEntryIdx) { |
| if (!nsChunkExists()) { |
| return -1; |
| } |
| if (getNamespaceEntryCount(nodeTree) <= nsEntryIdx) { |
| throw new IndexOutOfBoundsException(nsEntryIdx + " >= " + getNamespaceEntryCount(nodeTree)); |
| } |
| return IntegerPointable.getInteger(bytes, getNamespaceChunkOffset(nodeTree) + NS_CHUNK_SIZE_SIZE |
| + NS_ENTRY_SIZE * nsEntryIdx); |
| } |
| |
| public int getNamespaceURICode(NodeTreePointable nodeTree, int nsEntryIdx) { |
| if (!nsChunkExists()) { |
| return -1; |
| } |
| if (getNamespaceEntryCount(nodeTree) <= nsEntryIdx) { |
| throw new IndexOutOfBoundsException(nsEntryIdx + " >= " + getNamespaceEntryCount(nodeTree)); |
| } |
| return IntegerPointable.getInteger(bytes, getNamespaceChunkOffset(nodeTree) + NS_CHUNK_SIZE_SIZE |
| + NS_ENTRY_SIZE * nsEntryIdx + 1); |
| } |
| |
| public void getAttributeSequence(NodeTreePointable nodeTree, SequencePointable attributes) { |
| if (attributesChunkExists()) { |
| attributes.set(bytes, getAttributeChunkOffset(nodeTree), getAttributeChunkSize(nodeTree)); |
| } else { |
| attributes.set(null, -1, -1); |
| } |
| } |
| |
| public void getChildrenSequence(NodeTreePointable nodeTree, SequencePointable children) { |
| if (childrenChunkExists()) { |
| children.set(bytes, getChildrenChunkOffset(nodeTree), getChildrenChunkSize(nodeTree)); |
| } else { |
| children.set(null, -1, -1); |
| } |
| } |
| |
| private byte getHeader() { |
| return BytePointable.getByte(bytes, start); |
| } |
| |
| private int getNameOffset() { |
| return start + HEADER_SIZE; |
| } |
| |
| private int getNameSize() { |
| return CodedQNamePointable.SIZE; |
| } |
| |
| private int getTypeOffset() { |
| return getNameOffset() + getNameSize(); |
| } |
| |
| private int getTypeSize(NodeTreePointable nodeTree) { |
| return nodeTree.typeExists() ? CodedQNamePointable.SIZE : 0; |
| } |
| |
| protected int getLocalNodeIdOffset(NodeTreePointable nodeTree) { |
| return getTypeOffset() + getTypeSize(nodeTree); |
| } |
| |
| private int getLocalNodeIdSize(NodeTreePointable nodeTree) { |
| return nodeTree.nodeIdExists() ? LOCAL_NODE_ID_SIZE : 0; |
| } |
| |
| private int getNamespaceChunkOffset(NodeTreePointable nodeTree) { |
| return getLocalNodeIdOffset(nodeTree) + getLocalNodeIdSize(nodeTree); |
| } |
| |
| private int getNamespaceChunkSize(NodeTreePointable nodeTree) { |
| return nsChunkExists() ? getNamespaceEntryCount(nodeTree) * NS_ENTRY_SIZE + NS_CHUNK_SIZE_SIZE : 0; |
| } |
| |
| private int getAttributeChunkOffset(NodeTreePointable nodeTree) { |
| return getNamespaceChunkOffset(nodeTree) + getNamespaceChunkSize(nodeTree); |
| } |
| |
| private int getAttributeChunkSize(NodeTreePointable nodeTree) { |
| return attributesChunkExists() ? SequencePointable.getSequenceLength(bytes, getAttributeChunkOffset(nodeTree)) |
| : 0; |
| } |
| |
| private int getChildrenChunkOffset(NodeTreePointable nodeTree) { |
| return getAttributeChunkOffset(nodeTree) + getAttributeChunkSize(nodeTree); |
| } |
| |
| private int getChildrenChunkSize(NodeTreePointable nodeTree) { |
| return childrenChunkExists() ? SequencePointable.getSequenceLength(bytes, getChildrenChunkOffset(nodeTree)) : 0; |
| } |
| } |