org.apache.tika.io
Class TaggedInputStream

java.lang.Object
  extended by java.io.InputStream
      extended by java.io.FilterInputStream
          extended by org.apache.tika.io.ProxyInputStream
              extended by org.apache.tika.io.TaggedInputStream
All Implemented Interfaces:
Closeable
Direct Known Subclasses:
TikaInputStream

public class TaggedInputStream
extends ProxyInputStream

An input stream decorator that tags potential exceptions so that the stream that caused the exception can easily be identified. This is done by using the TaggedIOException class to wrap all thrown IOExceptions. See below for an example of using this class.

 TaggedInputStream stream = new TaggedInputStream(...);
 try {
     // Processing that may throw an IOException either from this stream
     // or from some other IO activity like temporary files, etc.
     processStream(stream);
 } catch (IOException e) {
     if (stream.isCauseOf(e)) {
         // The exception was caused by this stream.
         // Use e.getCause() to get the original exception.
     } else {
         // The exception was caused by something else.
     }
 }
 

Alternatively, the throwIfCauseOf(Exception) method can be used to let higher levels of code handle the exception caused by this stream while other processing errors are being taken care of at this lower level.

 TaggedInputStream stream = new TaggedInputStream(...);
 try {
     processStream(stream);
 } catch (IOException e) {
     stream.throwIfCauseOf(e);
     // ... or process the exception that was caused by something else
 }
 

See Also:
TaggedIOException

Field Summary
 
Fields inherited from class java.io.FilterInputStream
in
 
Constructor Summary
TaggedInputStream(InputStream proxy)
          Creates a tagging decorator for the given input stream.
 
Method Summary
static TaggedInputStream get(InputStream proxy)
          Casts or wraps the given stream to a TaggedInputStream instance.
protected  void handleIOException(IOException e)
          Tags any IOExceptions thrown, wrapping and re-throwing.
 boolean isCauseOf(IOException exception)
          Tests if the given exception was caused by this stream.
 void throwIfCauseOf(Exception exception)
          Re-throws the original exception thrown by this stream.
 String toString()
           
 
Methods inherited from class org.apache.tika.io.ProxyInputStream
afterRead, available, beforeRead, close, mark, markSupported, read, read, read, reset, skip
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

TaggedInputStream

public TaggedInputStream(InputStream proxy)
Creates a tagging decorator for the given input stream.

Parameters:
proxy - input stream to be decorated
Method Detail

get

public static TaggedInputStream get(InputStream proxy)
Casts or wraps the given stream to a TaggedInputStream instance.

Parameters:
stream - normal input stream
Returns:
a TaggedInputStream instance

isCauseOf

public boolean isCauseOf(IOException exception)
Tests if the given exception was caused by this stream.

Parameters:
exception - an exception
Returns:
true if the exception was thrown by this stream, false otherwise

throwIfCauseOf

public void throwIfCauseOf(Exception exception)
                    throws IOException
Re-throws the original exception thrown by this stream. This method first checks whether the given exception is a TaggedIOException wrapper created by this decorator, and then unwraps and throws the original wrapped exception. Returns normally if the exception was not thrown by this stream.

Parameters:
exception - an exception
Throws:
IOException - original exception, if any, thrown by this stream

handleIOException

protected void handleIOException(IOException e)
                          throws IOException
Tags any IOExceptions thrown, wrapping and re-throwing.

Overrides:
handleIOException in class ProxyInputStream
Parameters:
e - The IOException thrown
Throws:
IOException - if an I/O error occurs

toString

public String toString()
Overrides:
toString in class Object


Copyright © 2007-2012 The Apache Software Foundation. All Rights Reserved.