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## weka.gui.streams
Class InstanceJoiner

    java.lang.Object
      weka.gui.streams.InstanceJoiner

All Implemented Interfaces:
  java.io.Serializable, java.util.EventListener, InstanceProducer, SerialInstanceListener

    public class InstanceJoiner

extends java.lang.Object
implements java.io.Serializable, InstanceProducer, SerialInstanceListener

A bean that joins two streams of instances into one.

Version:
  $Revision: 4997 $
Author:
  Len Trigg (trigg@cs.waikato.ac.nz)
See Also:
  Serialized Form

Constructor Summary
`InstanceJoiner()` Setup the initial states of the member variables

Method Summary
`void` | `addInstanceListener(InstanceListener ipl)`
`void` | `batchFinished()` Signify that this batch of input to the filter is finished.
`boolean` | `getDebug()`
`boolean` | `input(Instance instance)`
`boolean` | `inputFormat(Instances instanceInfo)` Sets the format of the input instances.
`void` | `instanceProduced(InstanceEvent e)`
`Instances` | `outputFormat()` Gets the format of the output instances.
`Instance` | `outputPeek()` Output an instance after filtering but do not remove from the output queue.
`void` | `removeInstanceListener(InstanceListener ipl)`
`void` | `secondInstanceProduced(InstanceEvent e)`
`void` | `setDebug(boolean debug)`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### InstanceJoiner

    public InstanceJoiner()

  Setup the initial states of the member variables

Method Detail

### inputFormat

    public boolean inputFormat(Instances instanceInfo)

  Sets the format of the input instances. If the filter is able to determine the output format before seeing any input instances, it does so here. This default implementation assumes the output format is determined when batchFinished() is called.

  Parameters:
    `instanceInfo` - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
  Returns:
    true if the outputFormat may be collected immediately

### outputFormat

    public Instances outputFormat()
                           throws java.lang.Exception

  Gets the format of the output instances. This should only be called after input() or batchFinished() has returned true.

  Specified by:
    `outputFormat` in interface `InstanceProducer`
  Returns:
    an Instances object containing the output instance structure only.
  Throws:
    `java.lang.Exception` - if no input structure has been defined (or the output format hasn't been determined yet)

### input

    public boolean input(Instance instance)
                  throws java.lang.Exception

  Throws:
    `java.lang.Exception`

### batchFinished

    public void batchFinished()
                       throws java.lang.Exception

  Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances. Any subsequent instances filtered should be filtered based on setting obtained from the first batch (unless the inputFormat has been re-assigned or new options have been set). This default implementation assumes all instance processing occurs during inputFormat() and input().

  Throws:
    `java.lang.Exception` - if no input structure has been defined

### outputPeek

    public Instance outputPeek()
                        throws java.lang.Exception

  Output an instance after filtering but do not remove from the output queue.

  Specified by:
    `outputPeek` in interface `InstanceProducer`
  Returns:
    the instance that has most recently been filtered (or null if the queue is empty).
  Throws:
    `java.lang.Exception` - if no input structure has been defined

### setDebug

    public void setDebug(boolean debug)

### getDebug

    public boolean getDebug()

### addInstanceListener

    public void addInstanceListener(InstanceListener ipl)

  Specified by:
    `addInstanceListener` in interface `InstanceProducer`

### removeInstanceListener

    public void removeInstanceListener(InstanceListener ipl)

  Specified by:
    `removeInstanceListener` in interface `InstanceProducer`

### instanceProduced

    public void instanceProduced(InstanceEvent e)

### secondInstanceProduced

    public void secondInstanceProduced(InstanceEvent e)

  Specified by:
    `secondInstanceProduced` in interface `SerialInstanceListener`

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