/* | |
* 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.backend.hadoop.datastorage; | |
import java.io.IOException; | |
import org.apache.hadoop.fs.FSDataInputStream; | |
import org.apache.pig.PigException; | |
import org.apache.pig.backend.datastorage.SeekableInputStream; | |
import org.apache.pig.backend.executionengine.ExecException; | |
public class HSeekableInputStream extends SeekableInputStream { | |
protected FSDataInputStream input; | |
protected long contentLength; | |
HSeekableInputStream(FSDataInputStream input, | |
long contentLength) { | |
this.input = input; | |
this.contentLength = contentLength; | |
} | |
@Override | |
public void seek(long offset, FLAGS whence) throws IOException { | |
long targetPos; | |
switch (whence) { | |
case SEEK_SET: { | |
targetPos = offset; | |
break; | |
} | |
case SEEK_CUR: { | |
targetPos = input.getPos() + offset; | |
break; | |
} | |
case SEEK_END: { | |
targetPos = contentLength + offset; | |
break; | |
} | |
default: { | |
int errCode = 2098; | |
String msg = "Invalid seek option: " + whence; | |
throw new ExecException(msg, errCode, PigException.BUG); | |
} | |
} | |
input.seek(targetPos); | |
} | |
@Override | |
public long tell() throws IOException { | |
return input.getPos(); | |
} | |
@Override | |
public int read() throws IOException { | |
return input.read(); | |
} | |
@Override | |
public int read(byte[] b) throws IOException { | |
return input.read(b); | |
} | |
@Override | |
public int read(byte[] b, int off, int len ) throws IOException { | |
return input.read(b, off, len); | |
} | |
@Override | |
public int available() throws IOException { | |
return input.available(); | |
} | |
@Override | |
public long skip(long n) throws IOException { | |
return input.skip(n); | |
} | |
@Override | |
public void close() throws IOException { | |
input.close(); | |
} | |
@Override | |
public void mark(int readlimit) { | |
input.mark(readlimit); | |
} | |
@Override | |
public void reset() throws IOException { | |
input.reset(); | |
} | |
@Override | |
public boolean markSupported() { | |
return input.markSupported(); | |
} | |
} |