/*=========================================================================

  Program:   ParaView
  Module:    vtkSMInputProperty.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkSMInputProperty - proxy representing inputs to a filter
// .SECTION Description
// vtkSMInputProperty is a concrete sub-class of vtkSMProperty representing
// inputs to a filter (through vtkSMProxy). It is a special property that
// always calls AddInput on a vtkSMSourceProxy.
// The xml configuration for input proxy supports the following attributes:
// multiple_input: For an input port that connects multiple connections 
// such as the input of an append filter. port_index: The input port to
// be used.
// .SECTION See Also
// vtkSMInputProperty vtkSMSourceProxy

#ifndef vtkSMInputProperty_h
#define vtkSMInputProperty_h

//BTX
struct vtkSMInputPropertyInternals;
//ETX

#include "vtkPVServerManagerCoreModule.h" //needed for exports
#include "vtkSMProxyProperty.h"

class vtkSMStateLocator;

class VTKPVSERVERMANAGERCORE_EXPORT vtkSMInputProperty : public vtkSMProxyProperty
{
public:
  static vtkSMInputProperty* New();
  vtkTypeMacro(vtkSMInputProperty, vtkSMProxyProperty);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Should be set to true if the "input port" this property represents
  // can accept multiple inputs (for example, an append filter)
  vtkSetMacro(MultipleInput, int);
  vtkGetMacro(MultipleInput, int);

  // Description:
  // Add a proxy to the list of input proxies. The outputPort controls
  // which outputPort will be used in connecting the pipeline.
  // The proxy is added with corresponding Add and Set methods and
  // can be removed with RemoveXXX() methods as usual.
  void AddInputConnection(vtkSMProxy* proxy, unsigned int outputPort);
  void SetInputConnection(
    unsigned int idx, vtkSMProxy* proxy, unsigned int outputPort);

  void AddUncheckedInputConnection(vtkSMProxy* proxy, unsigned int outputPort);
  void SetUncheckedInputConnection(
    unsigned int idx, vtkSMProxy* proxy, unsigned int inputPort);

  // Description:
  // Sets the value of the property to the list of proxies specified.
  virtual void SetProxies(unsigned int numElements,
    vtkSMProxy* proxies[], unsigned int outputports[]);
  using Superclass::SetProxies;

  // Description:
  // Given an index for a connection (proxy), returns which output port
  // is used to connect the pipeline.
  unsigned int GetOutputPortForConnection(unsigned int idx);
  unsigned int GetUncheckedOutputPortForConnection(unsigned int idx);

  // Description:
  // Controls which input port this property uses when making connections.
  // By default, this is 0.
  vtkSetMacro(PortIndex, int);
  vtkGetMacro(PortIndex, int);

protected:
  vtkSMInputProperty();
  ~vtkSMInputProperty();

  // Description:
  // Set the appropriate ivars from the xml element. Should
  // be overwritten by subclass if adding ivars.
  virtual int ReadXMLAttributes(vtkSMProxy* parent, vtkPVXMLElement* element);

  // Description:
  // Fill state property/proxy XML element with output port attribute
  virtual vtkPVXMLElement* AddProxyElementState(
    vtkPVXMLElement *propertyElement, unsigned int idx);

  int MultipleInput;
  int PortIndex;
private:
  vtkSMInputProperty(const vtkSMInputProperty&); // Not implemented
  void operator=(const vtkSMInputProperty&); // Not implemented
};

#endif