Java tutorial
/** * 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.tajo.storage.text; import com.google.protobuf.Message; import io.netty.buffer.ByteBuf; import io.netty.buffer.ByteBufUtil; import io.netty.util.CharsetUtil; import org.apache.commons.codec.binary.Base64; import org.apache.tajo.catalog.Column; import org.apache.tajo.catalog.Schema; import org.apache.tajo.catalog.TableMeta; import org.apache.tajo.common.TajoDataTypes; import org.apache.tajo.datum.*; import org.apache.tajo.datum.protobuf.ProtobufJsonFormat; import org.apache.tajo.exception.ValueTooLongForTypeCharactersException; import org.apache.tajo.storage.FieldSerializerDeserializer; import org.apache.tajo.storage.StorageConstants; import org.apache.tajo.storage.StorageUtil; import org.apache.tajo.storage.Tuple; import org.apache.tajo.util.Bytes; import org.apache.tajo.util.NumberUtil; import java.io.IOException; import java.io.OutputStream; import java.nio.charset.CharsetDecoder; import java.util.TimeZone; public class TextFieldSerializerDeserializer implements FieldSerializerDeserializer { private static final byte[] trueBytes = "true".getBytes(Bytes.UTF8_CHARSET); private static final byte[] falseBytes = "false".getBytes(Bytes.UTF8_CHARSET); private static ProtobufJsonFormat protobufJsonFormat = ProtobufJsonFormat.getInstance(); private final CharsetDecoder decoder = CharsetUtil.getDecoder(CharsetUtil.UTF_8); private final TimeZone tableTimezone; private Schema schema; public TextFieldSerializerDeserializer(TableMeta meta) { tableTimezone = TimeZone.getTimeZone( meta.getProperty(StorageConstants.TIMEZONE, StorageUtil.TAJO_CONF.getSystemTimezone().getID())); } private static boolean isNull(ByteBuf val, ByteBuf nullBytes) { return !val.isReadable() || nullBytes.equals(val); } private static boolean isNullText(ByteBuf val, ByteBuf nullBytes) { return val.readableBytes() > 0 && ByteBufUtil.equals(nullBytes, val); } @Override public void init(Schema schema) { this.schema = schema; } @Override public int serialize(int columnIndex, Tuple tuple, OutputStream out, byte[] nullChars) throws IOException { byte[] bytes; int length = 0; Column col = schema.getColumn(columnIndex); TajoDataTypes.DataType dataType = col.getDataType(); if (tuple.isBlankOrNull(columnIndex)) { switch (dataType.getType()) { case CHAR: case TEXT: length = nullChars.length; out.write(nullChars); break; default: break; } return length; } switch (dataType.getType()) { case BOOLEAN: out.write(tuple.getBool(columnIndex) ? trueBytes : falseBytes); length = trueBytes.length; break; case CHAR: int size = dataType.getLength() - tuple.size(columnIndex); if (size < 0) { throw new ValueTooLongForTypeCharactersException(dataType.getLength()); } byte[] pad = new byte[size]; bytes = tuple.getBytes(columnIndex); out.write(bytes); out.write(pad); length = bytes.length + pad.length; break; case TEXT: case BIT: case INT2: case INT4: case INT8: case FLOAT4: case FLOAT8: case DATE: case INTERVAL: bytes = tuple.getTextBytes(columnIndex); length = bytes.length; out.write(bytes); break; case TIME: bytes = tuple.getTextBytes(columnIndex); length = bytes.length; out.write(bytes); break; case TIMESTAMP: // UTC to table timezone bytes = TimestampDatum.asChars(tuple.getTimeDate(columnIndex), tableTimezone, false) .getBytes(Bytes.UTF8_CHARSET); length = bytes.length; out.write(bytes); break; case BLOB: bytes = Base64.encodeBase64(tuple.getBytes(columnIndex), false); length = bytes.length; out.write(bytes, 0, length); break; case PROTOBUF: ProtobufDatum protobuf = (ProtobufDatum) tuple.getProtobufDatum(columnIndex); byte[] protoBytes = protobufJsonFormat.printToString(protobuf.get()).getBytes(Bytes.UTF8_CHARSET); length = protoBytes.length; out.write(protoBytes, 0, protoBytes.length); break; case NULL_TYPE: default: break; } return length; } @Override public Datum deserialize(int columnIndex, ByteBuf buf, ByteBuf nullChars) throws IOException { Datum datum; Column col = schema.getColumn(columnIndex); TajoDataTypes.Type type = col.getDataType().getType(); boolean nullField; if (type == TajoDataTypes.Type.TEXT || type == TajoDataTypes.Type.CHAR) { nullField = isNullText(buf, nullChars); } else { nullField = isNull(buf, nullChars); } if (nullField) { datum = NullDatum.get(); } else { switch (type) { case BOOLEAN: byte bool = buf.readByte(); datum = DatumFactory.createBool(bool == 't' || bool == 'T'); break; case BIT: datum = DatumFactory.createBit(Byte.parseByte( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString())); break; case CHAR: datum = DatumFactory.createChar( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString().trim()); break; case INT1: case INT2: datum = DatumFactory.createInt2((short) NumberUtil.parseInt(buf)); break; case INT4: datum = DatumFactory.createInt4(NumberUtil.parseInt(buf)); break; case INT8: datum = DatumFactory.createInt8(NumberUtil.parseLong(buf)); break; case FLOAT4: datum = DatumFactory.createFloat4( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString()); break; case FLOAT8: datum = DatumFactory.createFloat8(NumberUtil.parseDouble(buf)); break; case TEXT: { byte[] bytes = new byte[buf.readableBytes()]; buf.readBytes(bytes); datum = DatumFactory.createText(bytes); break; } case DATE: datum = DatumFactory.createDate( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString()); break; case TIME: datum = DatumFactory.createTime( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString()); break; case TIMESTAMP: // Convert to UTC by table timezone datum = DatumFactory.createTimestamp( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString(), tableTimezone); break; case INTERVAL: datum = DatumFactory.createInterval( decoder.decode(buf.nioBuffer(buf.readerIndex(), buf.readableBytes())).toString()); break; case PROTOBUF: { ProtobufDatumFactory factory = ProtobufDatumFactory.get(col.getDataType()); Message.Builder builder = factory.newBuilder(); try { byte[] bytes = new byte[buf.readableBytes()]; buf.readBytes(bytes); protobufJsonFormat.merge(bytes, builder); datum = ProtobufDatumFactory.createDatum(builder.build()); } catch (IOException e) { e.printStackTrace(); throw new RuntimeException(e); } break; } case BLOB: { byte[] bytes = new byte[buf.readableBytes()]; buf.readBytes(bytes); datum = DatumFactory.createBlob(Base64.decodeBase64(bytes)); break; } default: datum = NullDatum.get(); break; } } return datum; } }