| /** |
| * 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.lib; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.util.regex.Matcher; |
| |
| import org.apache.hadoop.io.Text; |
| |
| import org.apache.sqoop.io.LobFile; |
| |
| /** |
| * ClobRef is a wrapper that holds a CLOB either directly, or a |
| * reference to a file that holds the CLOB data. |
| */ |
| public class ClobRef |
| extends LobRef<String, String, Reader> { |
| |
| public ClobRef() { |
| super(); |
| } |
| |
| public ClobRef(String chars) { |
| super(chars); |
| } |
| |
| /** |
| * Initialize a clobref to an external CLOB. |
| * @param file the filename to the CLOB. May be relative to the job dir. |
| * @param offset the offset (in bytes) into the LobFile for this record. |
| * @param length the length of the record in characters. |
| */ |
| public ClobRef(String file, long offset, long length) { |
| super(file, offset, length); |
| } |
| |
| @Override |
| protected Reader getExternalSource(LobFile.Reader reader) |
| throws IOException { |
| return reader.readClobRecord(); |
| } |
| |
| @Override |
| protected Reader getInternalSource(String data) { |
| return new StringReader(data); |
| } |
| |
| @Override |
| protected String deepCopyData(String data) { |
| return data; |
| } |
| |
| @Override |
| protected String getInternalData(String data) { |
| return data; |
| } |
| |
| @Override |
| public void readFieldsInternal(DataInput in) throws IOException { |
| // For internally-stored clobs, the data is written as UTF8 Text. |
| setDataObj(Text.readString(in)); |
| } |
| |
| @Override |
| public void writeInternal(DataOutput out) throws IOException { |
| Text.writeString(out, getDataObj()); |
| } |
| |
| /** |
| * Create a ClobRef based on parsed data from a line of text. |
| * @param inputString the text-based input data to parse. |
| * @return a ClobRef to the given data. |
| */ |
| public static org.apache.sqoop.lib.ClobRef parse(String inputString) { |
| // If inputString is of the form 'externalLob(lf,%s,%d,%d)', then this is |
| // an external CLOB stored at the LobFile indicated by '%s' with the next |
| // two arguments representing its offset and length in the file. |
| // Otherwise, it is an inline CLOB, which we read as-is. |
| |
| Matcher m = EXTERNAL_MATCHER.get(); |
| m.reset(inputString); |
| if (m.matches()) { |
| // This is a LobFile. Extract the filename, offset and len from the |
| // matcher. |
| return new org.apache.sqoop.lib.ClobRef(m.group(1), |
| Long.valueOf(m.group(2)), Long.valueOf(m.group(3))); |
| } else { |
| // This is inline CLOB string data. |
| return new org.apache.sqoop.lib.ClobRef(inputString); |
| } |
| } |
| } |