| /* |
| * 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.phoenix.schema.types; |
| |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.hadoop.hbase.io.ImmutableBytesWritable; |
| import org.apache.phoenix.schema.ColumnValueEncoder; |
| import org.apache.phoenix.schema.SortOrder; |
| import org.apache.phoenix.util.ByteUtil; |
| import org.apache.phoenix.util.TrustedByteArrayOutputStream; |
| |
| public class PArrayDataTypeEncoder implements ColumnValueEncoder { |
| static private final int BYTE_ARRAY_DEFAULT_SIZE = 128; |
| |
| private PDataType baseType; |
| private SortOrder sortOrder; |
| private List<Integer> offsetPos; |
| private TrustedByteArrayOutputStream byteStream; |
| private DataOutputStream oStream; |
| private int nulls; |
| private byte serializationVersion; |
| private boolean rowKeyOrderOptimizable; |
| |
| public PArrayDataTypeEncoder(PDataType baseType, SortOrder sortOrder) { |
| this(new TrustedByteArrayOutputStream(BYTE_ARRAY_DEFAULT_SIZE), new LinkedList<Integer>(), baseType, sortOrder, true); |
| } |
| |
| public PArrayDataTypeEncoder(TrustedByteArrayOutputStream byteStream, DataOutputStream oStream, |
| int numElements, PDataType baseType, SortOrder sortOrder, boolean rowKeyOrderOptimizable, byte serializationVersion) { |
| this(byteStream, oStream, new ArrayList<Integer>(numElements), baseType, sortOrder, rowKeyOrderOptimizable, serializationVersion); |
| } |
| |
| public PArrayDataTypeEncoder(TrustedByteArrayOutputStream byteStream, DataOutputStream oStream, |
| int numElements, PDataType baseType, SortOrder sortOrder, boolean rowKeyOrderOptimizable) { |
| this(byteStream, oStream, new ArrayList<Integer>(numElements), baseType, sortOrder, rowKeyOrderOptimizable, PArrayDataType.SORTABLE_SERIALIZATION_VERSION); |
| } |
| |
| public PArrayDataTypeEncoder(TrustedByteArrayOutputStream byteStream, |
| List<Integer> offsetPos, PDataType baseType, SortOrder sortOrder, boolean rowKeyOrderOptimizable) { |
| this(byteStream, new DataOutputStream(byteStream), offsetPos, baseType, sortOrder, rowKeyOrderOptimizable, PArrayDataType.SORTABLE_SERIALIZATION_VERSION); |
| } |
| |
| public PArrayDataTypeEncoder(TrustedByteArrayOutputStream byteStream, DataOutputStream oStream, |
| List<Integer> offsetPos, PDataType baseType, SortOrder sortOrder, boolean rowKeyOrderOptimizable, byte serializationVersion) { |
| this.baseType = baseType; |
| this.sortOrder = sortOrder; |
| this.offsetPos = offsetPos; |
| this.byteStream = byteStream; |
| this.oStream = oStream; |
| this.nulls = 0; |
| this.serializationVersion = serializationVersion; |
| this.rowKeyOrderOptimizable = rowKeyOrderOptimizable; |
| } |
| |
| private void close() { |
| try { |
| if (byteStream != null) byteStream.close(); |
| if (oStream != null) oStream.close(); |
| byteStream = null; |
| oStream = null; |
| } catch (IOException ioe) {} |
| } |
| |
| // used to represent the absence of a value |
| @Override |
| public void appendAbsentValue() { |
| if (serializationVersion == PArrayDataType.IMMUTABLE_SERIALIZATION_VERSION && !baseType.isFixedWidth()) { |
| offsetPos.add(-byteStream.size()); |
| nulls++; |
| } |
| else { |
| throw new UnsupportedOperationException("Cannot represent an absent element"); |
| } |
| } |
| |
| public void appendValue(byte[] bytes) { |
| appendValue(bytes, 0, bytes.length); |
| } |
| |
| @Override |
| public void appendValue(byte[] bytes, int offset, int len) { |
| try { |
| // track the offset position here from the size of the byteStream |
| if (!baseType.isFixedWidth()) { |
| // Any variable length array would follow the below order |
| // Every element would be seperated by a seperator byte '0' |
| // Null elements are counted and once a first non null element appears we |
| // write the count of the nulls prefixed with a seperator byte |
| // Trailing nulls are not taken into account |
| // The last non null element is followed by two seperator bytes |
| // For eg |
| // a, b, null, null, c, null would be |
| // 65 0 66 0 0 2 67 0 0 0 |
| // a null null null b c null d would be |
| // 65 0 0 3 66 0 67 0 0 1 68 0 0 0 |
| if (len == 0) { |
| offsetPos.add(byteStream.size()); |
| nulls++; |
| } else { |
| nulls = PArrayDataType.serializeNulls(oStream, nulls); |
| offsetPos.add(byteStream.size()); |
| if (sortOrder == SortOrder.DESC) { |
| SortOrder.invert(bytes, offset, bytes, offset, len); |
| offset = 0; |
| } |
| oStream.write(bytes, offset, len); |
| if (serializationVersion == PArrayDataType.SORTABLE_SERIALIZATION_VERSION) { |
| oStream.write(PArrayDataType.getSeparatorByte(rowKeyOrderOptimizable, sortOrder)); |
| } |
| } |
| } else { |
| // No nulls for fixed length |
| if (sortOrder == SortOrder.DESC) { |
| SortOrder.invert(bytes, offset, bytes, offset, len); |
| offset = 0; |
| } |
| oStream.write(bytes, offset, len); |
| } |
| } catch (IOException e) {} |
| } |
| |
| @Override |
| public byte[] encode() { |
| try { |
| if (!baseType.isFixedWidth()) { |
| int noOfElements = offsetPos.size(); |
| int[] offsetPosArray = new int[noOfElements]; |
| int index = 0; |
| for (Integer i : offsetPos) { |
| offsetPosArray[index] = i; |
| ++index; |
| } |
| if (serializationVersion == PArrayDataType.SORTABLE_SERIALIZATION_VERSION) { |
| // Double seperator byte to show end of the non null array |
| PArrayDataType.writeEndSeperatorForVarLengthArray(oStream, sortOrder, rowKeyOrderOptimizable); |
| } |
| noOfElements = PArrayDataType.serializeOffsetArrayIntoStream(oStream, byteStream, noOfElements, |
| offsetPosArray[offsetPosArray.length - 1], offsetPosArray, serializationVersion); |
| PArrayDataType.serializeHeaderInfoIntoStream(oStream, noOfElements, serializationVersion); |
| } |
| ImmutableBytesWritable ptr = new ImmutableBytesWritable(); |
| ptr.set(byteStream.getBuffer(), 0, byteStream.size()); |
| return ByteUtil.copyKeyBytesIfNecessary(ptr); |
| } catch (IOException e) {} finally { |
| close(); |
| } |
| return null; |
| } |
| |
| } |