MtasUpdateRequestProcessorResultReader.java
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package mtas.solr.update.processor;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* The Class MtasUpdateRequestProcessorResultReader.
*/
public class MtasUpdateRequestProcessorResultReader implements Closeable {
/** The Constant log. */
private static final Log log = LogFactory
.getLog(MtasUpdateRequestProcessorResultReader.class);
/** The stored string value. */
private String storedStringValue;
/** The file input stream. */
private FileInputStream fileInputStream;
/** The object input stream. */
private ObjectInputStream objectInputStream;
/** The file. */
private File file;
/** The iterator. */
private Iterator<MtasUpdateRequestProcessorResultItem> iterator;
/** The closed. */
private boolean closed;
/**
* Instantiates a new mtas update request processor result reader.
*
* @param fileName the file name
* @throws IOException Signals that an I/O exception has occurred.
*/
public MtasUpdateRequestProcessorResultReader(String fileName)
throws IOException {
file = null;
fileInputStream = null;
objectInputStream = null;
closed = false;
iterator = null;
if (fileName != null) {
file = new File(fileName);
fileInputStream = new FileInputStream(file);
objectInputStream = new ObjectInputStream(fileInputStream);
try {
Object o = objectInputStream.readObject();
if (o instanceof String) {
storedStringValue = (String) o;
} else {
throw new IOException("invalid tokenStream");
}
iterator = new Iterator<MtasUpdateRequestProcessorResultItem>() {
MtasUpdateRequestProcessorResultItem next = null;
@Override
public boolean hasNext() {
if (!closed) {
if (next != null) {
return true;
} else {
next = getNext();
return next != null;
}
} else {
return false;
}
}
@Override
public MtasUpdateRequestProcessorResultItem next() {
if (!closed) {
MtasUpdateRequestProcessorResultItem result;
if (next != null) {
result = next;
next = null;
return result;
} else {
next = getNext();
if (next != null) {
result = next;
next = null;
return result;
} else {
throw new NoSuchElementException();
}
}
} else {
throw new NoSuchElementException();
}
}
private MtasUpdateRequestProcessorResultItem getNext() {
if (!closed) {
try {
Object o = objectInputStream.readObject();
if (o instanceof MtasUpdateRequestProcessorResultItem) {
return (MtasUpdateRequestProcessorResultItem) o;
} else {
forceClose();
return null;
}
} catch (ClassNotFoundException | IOException e) {
log.debug(e.getClass().getSimpleName()
+ " while retrieving data from " + fileName, e);
forceClose();
return null;
}
} else {
return null;
}
}
};
} catch (IOException e) {
log.error(e.getClass().getSimpleName() + " while processing " + fileName
+ " (" + e.getMessage() + ")", e);
forceClose();
throw new IOException(e.getMessage());
} catch (ClassNotFoundException e) {
log.error(e.getClass().getSimpleName() + " while processing " + fileName
+ " (" + e.getMessage() + ")", e);
forceClose();
throw new IOException("invalid tokenStream");
}
}
}
/**
* Gets the stored string value.
*
* @return the stored string value
*/
public String getStoredStringValue() {
return storedStringValue;
}
/**
* Gets the stored bin value.
*
* @return the stored bin value
*/
public byte[] getStoredBinValue() {
return null;
}
/**
* Gets the iterator.
*
* @return the iterator
*/
public Iterator<MtasUpdateRequestProcessorResultItem> getIterator() {
return iterator;
}
/*
* (non-Javadoc)
*
* @see java.io.Closeable#close()
*/
@Override
public void close() throws IOException {
forceClose();
}
/**
* Force close.
*/
private void forceClose() {
if (file != null) {
if (file.exists() && file.canWrite() && !file.delete()) {
log.debug("couldn't delete " + file.getName());
}
file = null;
}
try {
objectInputStream.close();
} catch (IOException e) {
log.debug(e);
}
closed = true;
}
}