opennlp.tools.util.MarkableFileInputStream Maven / Gradle / Ivy
/*
* 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 opennlp.tools.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
/**
* A markable File Input Stream.
*/
class MarkableFileInputStream extends InputStream {
private FileInputStream in;
private long markedPosition = -1;
private IOException markException;
MarkableFileInputStream(File file) throws FileNotFoundException {
in = new FileInputStream(file);
}
@Override
public synchronized void mark(int readlimit) {
try {
markedPosition = in.getChannel().position();
} catch (IOException e) {
markedPosition = -1;
}
}
@Override
public boolean markSupported() {
return true;
}
private void throwMarkExceptionIfOccured() throws IOException {
if (markException != null) {
throw markException;
}
}
@Override
public synchronized void reset() throws IOException {
throwMarkExceptionIfOccured();
if (markedPosition >= 0) {
in.getChannel().position(markedPosition);
}
else {
throw new IOException("Stream has to be marked before it can be reset!");
}
}
@Override
public int read() throws IOException {
return in.read();
}
@Override
public int read(byte[] b) throws IOException {
return in.read(b);
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
return in.read(b, off, len);
}
}