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.sqoop.mapreduce.hcat; import java.io.IOException; import java.math.BigDecimal; import java.sql.Date; import java.sql.Time; import java.sql.Timestamp; import java.util.Map; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.io.BytesWritable; import org.apache.hadoop.io.DefaultStringifier; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.MapWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.util.ReflectionUtils; import org.apache.hcatalog.common.HCatConstants; import org.apache.hcatalog.common.HCatUtil; import org.apache.hcatalog.data.HCatRecord; import org.apache.hcatalog.data.schema.HCatFieldSchema; import org.apache.hcatalog.data.schema.HCatSchema; import org.apache.hcatalog.mapreduce.InputJobInfo; import org.apache.sqoop.lib.SqoopRecord; import org.apache.sqoop.mapreduce.ExportJobBase; /** * Helper class for Sqoop HCat Integration export jobs. */ public class SqoopHCatExportHelper { private InputJobInfo jobInfo; private HCatSchema hCatFullTableSchema; public static final Log LOG = LogFactory.getLog(SqoopHCatExportHelper.class.getName()); private SqoopRecord sqoopRecord; private static final String TIMESTAMP_TYPE = "java.sql.Timestamp"; private static final String TIME_TYPE = "java.sql.Time"; private static final String DATE_TYPE = "java.sql.Date"; private static final String BIG_DECIMAL_TYPE = "java.math.BigDecimal"; private static final String FLOAT_TYPE = "Float"; private static final String DOUBLE_TYPE = "Double"; private static final String BYTE_TYPE = "Byte"; private static final String SHORT_TYPE = "Short"; private static final String INTEGER_TYPE = "Integer"; private static final String LONG_TYPE = "Long"; private static final String BOOLEAN_TYPE = "Boolean"; private static final String STRING_TYPE = "String"; private static final String BYTESWRITABLE = "org.apache.hadoop.io.BytesWritable"; private static boolean debugHCatExportMapper = false; private MapWritable colTypesJava; private MapWritable colTypesSql; public SqoopHCatExportHelper(Configuration conf) throws IOException, InterruptedException { colTypesJava = DefaultStringifier.load(conf, SqoopHCatUtilities.HCAT_DB_OUTPUT_COLTYPES_JAVA, MapWritable.class); colTypesSql = DefaultStringifier.load(conf, SqoopHCatUtilities.HCAT_DB_OUTPUT_COLTYPES_SQL, MapWritable.class); // Instantiate a copy of the user's class to hold and parse the record. String recordClassName = conf.get(ExportJobBase.SQOOP_EXPORT_TABLE_CLASS_KEY); if (null == recordClassName) { throw new IOException( "Export table class name (" + ExportJobBase.SQOOP_EXPORT_TABLE_CLASS_KEY + ") is not set!"); } debugHCatExportMapper = conf.getBoolean(SqoopHCatUtilities.DEBUG_HCAT_EXPORT_MAPPER_PROP, false); try { Class<?> cls = Class.forName(recordClassName, true, Thread.currentThread().getContextClassLoader()); sqoopRecord = (SqoopRecord) ReflectionUtils.newInstance(cls, conf); } catch (ClassNotFoundException cnfe) { throw new IOException(cnfe); } if (null == sqoopRecord) { throw new IOException("Could not instantiate object of type " + recordClassName); } String inputJobInfoStr = conf.get(HCatConstants.HCAT_KEY_JOB_INFO); jobInfo = (InputJobInfo) HCatUtil.deserialize(inputJobInfoStr); HCatSchema tableSchema = jobInfo.getTableInfo().getDataColumns(); HCatSchema partitionSchema = jobInfo.getTableInfo().getPartitionColumns(); hCatFullTableSchema = new HCatSchema(tableSchema.getFields()); for (HCatFieldSchema hfs : partitionSchema.getFields()) { hCatFullTableSchema.append(hfs); } } public SqoopRecord convertToSqoopRecord(HCatRecord hcr) throws IOException { Text key = new Text(); for (Map.Entry<String, Object> e : sqoopRecord.getFieldMap().entrySet()) { String colName = e.getKey(); String hfn = colName.toLowerCase(); key.set(hfn); String javaColType = colTypesJava.get(key).toString(); int sqlType = ((IntWritable) colTypesSql.get(key)).get(); HCatFieldSchema field = hCatFullTableSchema.get(hfn); HCatFieldSchema.Type fieldType = field.getType(); Object hCatVal = hcr.get(hfn, hCatFullTableSchema); String hCatTypeString = field.getTypeString(); Object sqlVal = convertToSqoop(hCatVal, fieldType, javaColType, hCatTypeString); if (debugHCatExportMapper) { LOG.debug("hCatVal " + hCatVal + " of type " + (hCatVal == null ? null : hCatVal.getClass().getName()) + ",sqlVal " + sqlVal + " of type " + (sqlVal == null ? null : sqlVal.getClass().getName()) + ",java type " + javaColType + ", sql type = " + SqoopHCatUtilities.sqlTypeString(sqlType)); } sqoopRecord.setField(colName, sqlVal); } return sqoopRecord; } private Object convertToSqoop(Object val, HCatFieldSchema.Type fieldType, String javaColType, String hCatTypeString) throws IOException { if (val == null) { return null; } switch (fieldType) { case INT: case TINYINT: case SMALLINT: case FLOAT: case DOUBLE: val = convertNumberTypes(val, javaColType); if (val != null) { return val; } break; case BOOLEAN: val = convertBooleanTypes(val, javaColType); if (val != null) { return val; } break; case BIGINT: if (javaColType.equals(DATE_TYPE)) { return new Date((Long) val); } else if (javaColType.equals(TIME_TYPE)) { return new Time((Long) val); } else if (javaColType.equals(TIMESTAMP_TYPE)) { return new Timestamp((Long) val); } else { val = convertNumberTypes(val, javaColType); if (val != null) { return val; } } break; case STRING: val = convertStringTypes(val, javaColType); if (val != null) { return val; } break; case BINARY: val = convertBinaryTypes(val, javaColType); if (val != null) { return val; } break; case ARRAY: case MAP: case STRUCT: default: throw new IOException("Cannot convert HCatalog type " + fieldType); } LOG.error("Cannot convert HCatalog object of " + " type " + hCatTypeString + " to java object type " + javaColType); return null; } private Object convertBinaryTypes(Object val, String javaColType) { byte[] bb = (byte[]) val; if (javaColType.equals(BYTESWRITABLE)) { BytesWritable bw = new BytesWritable(); bw.set(bb, 0, bb.length); return bw; } return null; } private Object convertStringTypes(Object val, String javaColType) { String valStr = val.toString(); if (javaColType.equals(BIG_DECIMAL_TYPE)) { return new BigDecimal(valStr); } else if (javaColType.equals(DATE_TYPE) || javaColType.equals(TIME_TYPE) || javaColType.equals(TIMESTAMP_TYPE)) { // Oracle expects timestamps for Date also by default based on version // Just allow all date types to be assignment compatible if (valStr.length() == 10) { // Date in yyyy-mm-dd format Date d = Date.valueOf(valStr); if (javaColType.equals(DATE_TYPE)) { return d; } else if (javaColType.equals(TIME_TYPE)) { return new Time(d.getTime()); } else if (javaColType.equals(TIMESTAMP_TYPE)) { return new Timestamp(d.getTime()); } } else if (valStr.length() == 8) { // time in hh:mm:ss Time t = Time.valueOf(valStr); if (javaColType.equals(DATE_TYPE)) { return new Date(t.getTime()); } else if (javaColType.equals(TIME_TYPE)) { return t; } else if (javaColType.equals(TIMESTAMP_TYPE)) { return new Timestamp(t.getTime()); } } else if (valStr.length() == 19) { // timestamp in yyyy-mm-dd hh:ss:mm Timestamp ts = Timestamp.valueOf(valStr); if (javaColType.equals(DATE_TYPE)) { return new Date(ts.getTime()); } else if (javaColType.equals(TIME_TYPE)) { return new Time(ts.getTime()); } else if (javaColType.equals(TIMESTAMP_TYPE)) { return ts; } } else { return null; } } else if (javaColType.equals(STRING_TYPE)) { return valStr; } else if (javaColType.equals(BOOLEAN_TYPE)) { return Boolean.valueOf(valStr); } else if (javaColType.equals(BYTE_TYPE)) { return Byte.parseByte(valStr); } else if (javaColType.equals(SHORT_TYPE)) { return Short.parseShort(valStr); } else if (javaColType.equals(INTEGER_TYPE)) { return Integer.parseInt(valStr); } else if (javaColType.equals(LONG_TYPE)) { return Long.parseLong(valStr); } else if (javaColType.equals(FLOAT_TYPE)) { return Float.parseFloat(valStr); } else if (javaColType.equals(DOUBLE_TYPE)) { return Double.parseDouble(valStr); } return null; } private Object convertBooleanTypes(Object val, String javaColType) { Boolean b = (Boolean) val; if (javaColType.equals(BOOLEAN_TYPE)) { return b; } else if (javaColType.equals(BYTE_TYPE)) { return (byte) (b ? 1 : 0); } else if (javaColType.equals(SHORT_TYPE)) { return (short) (b ? 1 : 0); } else if (javaColType.equals(INTEGER_TYPE)) { return (int) (b ? 1 : 0); } else if (javaColType.equals(LONG_TYPE)) { return (long) (b ? 1 : 0); } else if (javaColType.equals(FLOAT_TYPE)) { return (float) (b ? 1 : 0); } else if (javaColType.equals(DOUBLE_TYPE)) { return (double) (b ? 1 : 0); } else if (javaColType.equals(BIG_DECIMAL_TYPE)) { return new BigDecimal(b ? 1 : 0); } else if (javaColType.equals(STRING_TYPE)) { return val.toString(); } return null; } private Object convertNumberTypes(Object val, String javaColType) { Number n = (Number) val; if (javaColType.equals(BYTE_TYPE)) { return n.byteValue(); } else if (javaColType.equals(SHORT_TYPE)) { return n.shortValue(); } else if (javaColType.equals(INTEGER_TYPE)) { return n.intValue(); } else if (javaColType.equals(LONG_TYPE)) { return n.longValue(); } else if (javaColType.equals(FLOAT_TYPE)) { return n.floatValue(); } else if (javaColType.equals(DOUBLE_TYPE)) { return n.doubleValue(); } else if (javaColType.equals(BIG_DECIMAL_TYPE)) { return new BigDecimal(n.doubleValue()); } else if (javaColType.equals(BOOLEAN_TYPE)) { return n.byteValue() == 0 ? Boolean.FALSE : Boolean.TRUE; } else if (javaColType.equals(STRING_TYPE)) { return n.toString(); } return null; } }