| /** |
| * 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.ByteArrayInputStream; |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| import java.util.regex.Matcher; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.io.BytesWritable; |
| |
| import com.cloudera.sqoop.io.LobFile; |
| |
| /** |
| * BlobRef is a wrapper that holds a BLOB either directly, or a |
| * reference to a file that holds the BLOB data. |
| */ |
| public class BlobRef extends |
| com.cloudera.sqoop.lib.LobRef<byte[], BytesWritable, InputStream> { |
| |
| public static final Log LOG = LogFactory.getLog(BlobRef.class.getName()); |
| |
| public BlobRef() { |
| super(); |
| } |
| |
| public BlobRef(byte [] bytes) { |
| super(new BytesWritable(bytes)); |
| } |
| |
| /** |
| * Initialize a BlobRef to an external BLOB. |
| * @param file the filename to the BLOB. 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 bytes. |
| */ |
| public BlobRef(String file, long offset, long length) { |
| super(file, offset, length); |
| } |
| |
| @Override |
| protected InputStream getExternalSource(LobFile.Reader reader) |
| throws IOException { |
| return reader.readBlobRecord(); |
| } |
| |
| @Override |
| protected InputStream getInternalSource(BytesWritable data) { |
| return new ByteArrayInputStream(data.getBytes(), 0, data.getLength()); |
| } |
| |
| @Override |
| protected byte [] getInternalData(BytesWritable data) { |
| return Arrays.copyOf(data.getBytes(), data.getLength()); |
| } |
| |
| @Override |
| protected BytesWritable deepCopyData(BytesWritable data) { |
| return new BytesWritable(Arrays.copyOf(data.getBytes(), data.getLength())); |
| } |
| |
| @Override |
| public void readFieldsInternal(DataInput in) throws IOException { |
| // For internally-stored BLOBs, the data is a BytesWritable |
| // containing the actual data. |
| |
| BytesWritable data = getDataObj(); |
| |
| if (null == data) { |
| data = new BytesWritable(); |
| } |
| data.readFields(in); |
| setDataObj(data); |
| } |
| |
| @Override |
| public void writeInternal(DataOutput out) throws IOException { |
| getDataObj().write(out); |
| } |
| |
| /** |
| * Create a BlobRef based on parsed data from a line of text. |
| * This only operates correctly on external blobs; inline blobs are simply |
| * returned as null. You should store BLOB data in SequenceFile format |
| * if reparsing is necessary. |
| * @param inputString the text-based input data to parse. |
| * @return a new BlobRef containing a reference to an external BLOB, or |
| * an empty BlobRef if the data to be parsed is actually inline. |
| */ |
| public static com.cloudera.sqoop.lib.BlobRef parse(String inputString) { |
| // If inputString is of the form 'externalLob(lf,%s,%d,%d)', then this is |
| // an external BLOB 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 BLOB, which we don't support parsing of. |
| |
| Matcher m = org.apache.sqoop.lib.LobRef.EXTERNAL_MATCHER.get(); |
| m.reset(inputString); |
| if (m.matches()) { |
| // This is a LobFile. Extract the filename, offset and len from the |
| // matcher. |
| return new com.cloudera.sqoop.lib.BlobRef(m.group(1), |
| Long.valueOf(m.group(2)), Long.valueOf(m.group(3))); |
| } else { |
| // This is inline BLOB string data. |
| LOG.warn( |
| "Reparsing inline BLOB data is not supported; use SequenceFiles."); |
| return new com.cloudera.sqoop.lib.BlobRef(); |
| } |
| } |
| } |