/*
* 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.pig.builtin;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;
import org.apache.pig.ExecType;
import org.apache.pig.PigException;
import org.apache.pig.PigWarning;
import org.apache.pig.ReversibleLoadStoreFunc;
import org.apache.pig.backend.datastorage.DataStorage;
import org.apache.pig.backend.datastorage.ElementDescriptor;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataReaderWriter;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.io.BufferedPositionedInputStream;
import org.apache.pig.impl.io.FileLocalizer;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.logicalLayer.schema.SchemaMergeException;
import org.apache.pig.impl.util.LogUtils;
import org.apache.pig.impl.util.WrappedIOException;
public class BinStorage implements ReversibleLoadStoreFunc {
public static final byte RECORD_1 = 0x01;
public static final byte RECORD_2 = 0x02;
public static final byte RECORD_3 = 0x03;
Iterator<Tuple> i = null;
protected BufferedPositionedInputStream in = null;
private static final Log mLog = LogFactory.getLog(BinStorage.class);
private DataInputStream inData = null;
protected long end = Long.MAX_VALUE;
/**
* Simple binary nested reader format
*/
public BinStorage() {
}
public Tuple getNext() throws IOException {
byte b = 0;
// skip to next record
while (true) {
if (in == null || in.getPosition() >=end) {
return null;
}
// check if we saw RECORD_1 in our last attempt
// this can happen if we have the following
// sequence RECORD_1-RECORD_1-RECORD_2-RECORD_3
// After reading the second RECORD_1 in the above
// sequence, we should not look for RECORD_1 again
if(b != RECORD_1) {
b = (byte) in.read();
if(b != RECORD_1 && b != -1) {
continue;
}
if(b == -1) return null;
}
b = (byte) in.read();
if(b != RECORD_2 && b != -1) {
continue;
}
if(b == -1) return null;
b = (byte) in.read();
if(b != RECORD_3 && b != -1) {
continue;
}
if(b == -1) return null;
b = (byte) in.read();
if(b != DataType.TUPLE && b != -1) {
continue;
}
if(b == -1) return null;
break;
}
try {
// if we got here, we have seen RECORD_1-RECORD_2-RECORD_3-TUPLE_MARKER
// sequence - lets now read the contents of the tuple
return (Tuple)DataReaderWriter.readDatum(inData, DataType.TUPLE);
} catch (ExecException ee) {
throw ee;
}
}
public void bindTo(String fileName, BufferedPositionedInputStream in, long offset, long end) throws IOException {
this.in = in;
inData = new DataInputStream(in);
this.end = end;
}
DataOutputStream out = null;
public void bindTo(OutputStream os) throws IOException {
this.out = new DataOutputStream(new BufferedOutputStream(os));
}
public void finish() throws IOException {
out.flush();
}
public void putNext(Tuple t) throws IOException {
out.write(RECORD_1);
out.write(RECORD_2);
out.write(RECORD_3);
t.write(out);
}
public DataBag bytesToBag(byte[] b){
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return DataReaderWriter.bytesToBag(dis);
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to bag, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public String bytesToCharArray(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return DataReaderWriter.bytesToCharArray(dis);
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to chararray, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public Double bytesToDouble(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return new Double(dis.readDouble());
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to double, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public Float bytesToFloat(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return new Float(dis.readFloat());
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to float, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public Integer bytesToInteger(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return new Integer(dis.readInt());
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to integer, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public Long bytesToLong(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return new Long(dis.readLong());
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to long, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public Map<Object, Object> bytesToMap(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return DataReaderWriter.bytesToMap(dis);
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to map, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
public Tuple bytesToTuple(byte[] b) {
DataInputStream dis = new DataInputStream(new ByteArrayInputStream(b));
try {
return DataReaderWriter.bytesToTuple(dis);
} catch (IOException e) {
LogUtils.warn(this, "Unable to convert bytearray to tuple, " +
"caught IOException <" + e.getMessage() + ">",
PigWarning.FIELD_DISCARDED_TYPE_CONVERSION_FAILED,
mLog);
return null;
}
}
/* (non-Javadoc)
* @see org.apache.pig.LoadFunc#determineSchema(java.lang.String, org.apache.pig.ExecType, org.apache.pig.backend.datastorage.DataStorage)
*/
public Schema determineSchema(String fileName, ExecType execType,
DataStorage storage) throws IOException {
if (!FileLocalizer.fileExists(fileName, storage)) {
// At compile time in batch mode, the file may not exist
// (such as intermediate file). Just return null - the
// same way as we would if we did not get a valid record
return null;
}
InputStream is = FileLocalizer.open(fileName, execType, storage);
bindTo(fileName, new BufferedPositionedInputStream(is), 0, Long.MAX_VALUE);
// get the first record from the input file
// and figure out the schema from the data in
// the first record
Tuple t = getNext();
is.close();
if(t == null) {
// we couldn't get a valid record from the input
return null;
}
int numFields = t.size();
Schema s = new Schema();
for (int i = 0; i < numFields; i++) {
try {
s.add(DataType.determineFieldSchema(t.get(i)));
} catch (Exception e) {
int errCode = 2104;
String msg = "Error while determining schema of BinStorage data.";
throw new ExecException(msg, errCode, PigException.BUG, e);
}
}
return s;
}
public void fieldsToRead(Schema schema) {
// TODO Auto-generated method stub
}
public byte[] toBytes(DataBag bag) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, bag);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting bag to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(String s) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, s);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting chararray to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(Double d) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, d);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting double to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(Float f) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, f);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting float to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(Integer i) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, i);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting int to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(Long l) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, l);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting long to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(Map<Object, Object> m) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, m);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting map to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public byte[] toBytes(Tuple t) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
try {
DataReaderWriter.writeDatum(dos, t);
} catch (Exception ee) {
int errCode = 2105;
String msg = "Error while converting tuple to bytes.";
throw new ExecException(msg, errCode, PigException.BUG, ee);
}
return baos.toByteArray();
}
public boolean equals(Object obj) {
return true;
}
/* (non-Javadoc)
* @see org.apache.pig.StoreFunc#getStorePreparationClass()
*/
@Override
public Class getStorePreparationClass() throws IOException {
// TODO Auto-generated method stub
return null;
}
}