/**
 * @file    EventAssignment.h
 * @brief   Definition of EventAssignment.
 * @author  Ben Bornstein
 *
 * $Id: EventAssignment.h 11751 2010-08-22 12:29:24Z mhucka $
 * $HeadURL: https://sbml.svn.sourceforge.net/svnroot/sbml/trunk/libsbml/src/sbml/EventAssignment.h $
 *
 *<!---------------------------------------------------------------------------
 * This file is part of libSBML.  Please visit http://sbml.org for more
 * information about SBML, and the latest version of libSBML.
 *
 * Copyright 2005-2010 California Institute of Technology.
 * Copyright 2002-2005 California Institute of Technology and
 *                     Japan Science and Technology Corporation.
 * 
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.  A copy of the license agreement is provided
 * in the file named "LICENSE.txt" included with this software distribution
 * and also available online as http://sbml.org/software/libsbml/license.html
 *------------------------------------------------------------------------- -->
 *
 * @class EventAssignment
 * @brief LibSBML implementation of %SBML's %EventAssignment construct for %Event
 *
 * An Event object defines when the event can occur, the variables that are
 * affected by the event, and how the variables are affected.  The purpose
 * of the EventAssignment object class is to define how variables are
 * affected by an Event.  In every instance of an Event definition in a
 * model, the object's ListOfEventAssignments must have a non-empty list of
 * one or more elements of class EventAssignment.
 *
 * The operation of an Event is divided into two phases (regardless of
 * whether a delay is involved): one phase when the event is @em fired, and
 * the other when the event is @em executed.  EventAssignment objects are
 * interpreted when an event is executed.  The effects are described below.
 * 
 * EventAssignment is derived from SBase and adds one attribute
 * ("variable") and one subelement ("math", containing MathML content).
 * The attribute "variable" is required to have a value.  Its type is the
 * SBML type @c SId and can contain the identifier of an existing
 * Compartment, Species or (global) Parameter instance defined in the
 * model.
 *
 * @section event-variable Effects of event assignments
 * 
 * An SBML event assignment has effect when the event is @em executed; that
 * is, at the end of any given delay period (if defined) following the
 * moment that the Event is triggered.  When the event fires, the effect is
 * to change the value of the model component identified by the "variable"
 * attribute.
 * 
 * Certain restrictions are placed on what can appear in "variable":
 * <ul>
 * <li> The object identified by the value of the EventAssignment attribute
 * "variable" must not have its "constant" attribute set to or default to
 * @c true.  (Constants cannot be affected by events.)
 *
 * <li> The "variable" attribute must not contain the identifier of a
 * reaction; only species, compartment and parameter values may be set by
 * an Event.
 *
 * <li> The value of every "variable" attribute must be unique among the set
 * of EventAssignment structures within a given Event structure.  In other
 * words, a single event cannot have multiple EventAssignment objects
 * assigning the same variable.  (All of them would be performed at the
 * same time when that particular Event triggers, resulting in
 * indeterminacy.)  However, @em separate Event instances can refer to the
 * same variable.
 *  
 * <li> A variable cannot be assigned a value in an EventAssignment object
 * instance and also be assigned a value by an AssignmentRule; i.e., the
 * value of an EventAssignment's "variable" attribute cannot be the same as
 * the value of a AssignmentRule' "variable" attribute.  (Assignment rules
 * hold at all times, therefore it would be inconsistent to also define an
 * event that reassigns the value of the same variable.)
 * </ul>
 *
 * Note that the time of assignment of the object identified by the
 * value of the "variable" attribute is always the time at which the Event
 * is <em>executed</em>, not when it is <em>fired</em>.  The timing is
 * controlled by the optional Delay in an Event.  The time of
 * assignment is not affected by the "useValuesFromTriggerTime"
 * attribute on Event&mdash;that attribute affects the time at which the
 * EventAssignment's "math" expression is @em evaluated.  In other
 * words, SBML allows decoupling the time at which the
 * "variable" is assigned from the time at which its value
 * expression is calculated.
 *
 * @section event-math The "math" subelement in an EventAssignment
 * 
 * The MathML expression contained in an EventAssignment defines the new
 * value of the variable being assigned by the Event.  The order of the
 * EventAssignment structures is not significant; the effect of one
 * assignment cannot affect the result of another assignment.
 *
 * The time at which this expression is evaluated is determined by Event's
 * "useValuesFromTriggerTime" attribute.  If the attribute value is @c true
 * (the default), the expression must be evaluated when the event is
 * <em>fired</em>; more precisely, the values of identifiers occurring in
 * MathML @c ci attributes in the EventAssignment's "math" expression are
 * the values they have at the point when the event <em>fired</em>.  If,
 * instead, "useValuesFromTriggerTime"'s value is @c false, it means the
 * values at <em>execution</em> time should be used; that is, the values of
 * identifiers occurring in MathML @c ci attributes in the
 * EventAssignment's "math" expression are the values they have at the
 * point when the event <em>executed</em>.
 *
 * Between Version&nbsp;4 and previous versions of SBML Level&nbsp;2, the
 * requirements regarding the matching of units between an
 * EvengAssignment's formula and the units of the object identified by the
 * "variable" attribute changed.  Previous versions required consistency,
 * but in Version&nbsp;4, unit consistency is only recommended.  More
 * precisely: <ul> <li> In the case of a species, an EventAssignment sets
 * the referenced species' quantity (concentration or amount of substance)
 * to the value determined by the formula in the EventAssignment's "math"
 * subelement.  The units of the "math" formula should (in SBML
 * Level&nbsp;2 Version&nbsp;4) or must (in previous Versions) be identical
 * to the units of the species.
 *
 * <li> In the case of a compartment, an EventAssignment sets the
 * referenced compartment's size to the size determined by the formula in
 * the "math" subelement of the EventAssignment.  The overall units of the
 * formula should (in SBML Level&nbsp;2 Version&nbsp;4) or must (in
 * previous Versions) be identical to the units specified for the size of
 * the compartment identified by the EventAssignment's "variable"
 * attribute.
 *
 * <li> In the case of a parameter, an EventAssignment sets the referenced
 * parameter's value to that determined by the formula in "math".  The
 * overall units of the formula should (in SBML Level&nbsp;2
 * Version&nbsp;4) or must (in previous Versions) be identical to the units
 * defined for the parameter.
 * </ul>
 * 
 * Note that the formula placed in the "math" element <em>has no assumed
 * units</em>.  The consistency of the units of the formula, and the units
 * of the entity which the assignment affects, must be explicitly
 * established just as in the case of the value of the Delay subelement.
 * An approach similar to the one discussed in the context of Delay may be
 * used for the formula of an EventAssignment.
 *
 * @section event-semantics Semantics of Event and EventAssignment
 *
 * Readers are urged to consult the SBML specification for important
 * information about the interpretation of Event and EventAssignment.
 *
 *
 * @class ListOfEventAssignments 
 * @brief LibSBML implementation of SBML's %ListOfEventAssignments construct.
 *
 * The various ListOf___ classes in %SBML are merely containers used for
 * organizing the main components of an %SBML model.  All are derived from
 * the abstract class SBase, and inherit the various attributes and
 * subelements of SBase, such as "metaid" as and "annotation".  The
 * ListOf___ classes do not add any attributes of their own.
 *
 * ListOfEventAssignments is entirely contained within Event.
 */

#ifndef EventAssignment_h
#define EventAssignment_h


#include <sbml/common/extern.h>
#include <sbml/common/sbmlfwd.h>


#ifdef __cplusplus


#include <string>

#include <sbml/SBase.h>
#include <sbml/ListOf.h>

LIBSBML_CPP_NAMESPACE_BEGIN

class ASTNode;
class SBMLVisitor;


class LIBSBML_EXTERN EventAssignment : public SBase
{
public:

  /**
   * Creates a new EventAssignment using the given SBML @p level and @p version
   * values.
   *
   * @param level an unsigned int, the SBML Level to assign to this EventAssignment
   *
   * @param version an unsigned int, the SBML Version to assign to this
   * EventAssignment
   * 
   * @note Upon the addition of a EventAssignment object to an SBMLDocument
   * (e.g., using Model::addEventAssignment()), the SBML Level, SBML
   * Version and XML namespace of the document @em override the
   * values used when creating the EventAssignment object via this
   * constructor.  This is necessary to ensure that an SBML document is a
   * consistent structure.  Nevertheless, the ability to supply the values
   * at the time of creation of a EventAssignment is an important aid to
   * producing valid SBML.  Knowledge of the intented SBML Level and
   * Version determine whether it is valid to assign a particular value to
   * an attribute, or whether it is valid to add an object to an existing
   * SBMLDocument.
   */
  EventAssignment (unsigned int level, unsigned int version);


  /**
   * Creates a new EventAssignment using the given SBMLNamespaces object
   * @p sbmlns.
   *
   * The SBMLNamespaces object encapsulates SBML Level/Version/namespaces
   * information.  It is used to communicate the SBML Level, Version, and
   * (in Level&nbsp;3) packages used in addition to SBML Level&nbsp;3 Core.
   * A common approach to using this class constructor is to create an
   * SBMLNamespaces object somewhere in a program, once, then pass it to
   * object constructors such as this one when needed.
   *
   * @param sbmlns an SBMLNamespaces object.
   *
   * @note Upon the addition of a EventAssignment object to an SBMLDocument
   * (e.g., using Model::addEventAssignment()), the SBML XML namespace of
   * the document @em overrides the value used when creating the
   * EventAssignment object via this constructor.  This is necessary to
   * ensure that an SBML document is a consistent structure.  Nevertheless,
   * the ability to supply the values at the time of creation of a
   * EventAssignment is an important aid to producing valid SBML.
   * Knowledge of the intented SBML Level and Version determine whether it
   * is valid to assign a particular value to an attribute, or whether it
   * is valid to add an object to an existing SBMLDocument.
   */
  EventAssignment (SBMLNamespaces* sbmlns);


  /**
   * Destroys this EventAssignment.
   */
  virtual ~EventAssignment ();


  /**
   * Copy constructor; creates a copy of this EventAssignment.
   */
  EventAssignment (const EventAssignment& orig);


  /**
   * Assignment operator.
   */
  EventAssignment& operator=(const EventAssignment& rhs);


  /**
   * Accepts the given SBMLVisitor for this instance of EventAssignment.
   *
   * @param v the SBMLVisitor instance to be used.
   *
   * @return the result of calling <code>v.visit()</code>, which indicates
   * whether the Visitor would like to visit the next EventAssignment in
   * the list within which this EventAssignment is embedded (i.e., in the
   * ListOfEventAssignments located in the enclosing Event instance).
   */
  virtual bool accept (SBMLVisitor& v) const;


  /**
   * Creates and returns a deep copy of this EventAssignment.
   * 
   * @return a (deep) copy of this EventAssignment.
   */
  virtual EventAssignment* clone () const;


  /**
   * Get the value of this EventAssignment's "variable" attribute.
   * 
   * @return the identifier stored in the "variable" attribute of this
   * EventAssignment.
   */
  const std::string& getVariable () const;


  /**
   * Get the mathematical expression in this EventAssignment's "math"
   * subelement.
   * 
   * @return the top ASTNode of an abstract syntax tree representing the
   * mathematical formula in this EventAssignment.
   */
  const ASTNode* getMath () const;


  /**
   * Predicate for testing whether the attribute "variable" of this
   * EventAssignment has been set.
   * 
   * @return @c true if the "variable" attribute of this EventAssignment
   * has been set, @c false otherwise.
   */
  bool isSetVariable () const;


  /**
   * Predicate for testing whether the "math" subelement of this
   * EventAssignment has been set.
   * 
   * @return @c true if this EventAssignment has a "math" subelement,
   * @c false otherwise.
   */
  bool isSetMath () const;


  /**
   * Sets the attribute "variable" of this EventAssignment to a copy of
   * the given identifier string.
   *
   * @param sid the identifier of a Compartment, Species or (global)
   * Parameter defined in this model.
   *
   * @return integer value indicating success/failure of the
   * function.  @if clike The value is drawn from the
   * enumeration #OperationReturnValues_t. @endif The possible values
   * returned by this function are:
   * @li @link OperationReturnValues_t#LIBSBML_OPERATION_SUCCESS LIBSBML_OPERATION_SUCCESS @endlink
   * @li @link OperationReturnValues_t#LIBSBML_INVALID_ATTRIBUTE_VALUE LIBSBML_INVALID_ATTRIBUTE_VALUE @endlink
   */
  int setVariable (const std::string& sid);


  /**
   * Sets the "math" subelement of this EventAssignment to a copy of the
   * given ASTNode.
   *
   * @param math an ASTNode that will be copied and stored as the
   * mathematical formula for this EventAssignment.
   *
   * @return integer value indicating success/failure of the
   * function.  @if clike The value is drawn from the
   * enumeration #OperationReturnValues_t. @endif The possible values
   * returned by this function are:
   * @li @link OperationReturnValues_t#LIBSBML_OPERATION_SUCCESS LIBSBML_OPERATION_SUCCESS @endlink
   * @li @link OperationReturnValues_t#LIBSBML_INVALID_OBJECT LIBSBML_INVALID_OBJECT @endlink
   */
  int setMath (const ASTNode* math);


  /**
   * Calculates and returns a UnitDefinition that expresses the units
   * of measurement assumed for the "math" expression of this
   * EventAssignment.
   *
   * The units are calculated based on the mathematical expression in the
   * EventAssignment and the model quantities referenced by
   * <code>&lt;ci&gt;</code> elements used within that expression.  The
   * EventAssignment::getDerivedUnitDefinition() method returns the
   * calculated units.
   *
   * Note that the functionality that facilitates unit analysis depends 
   * on the model as a whole.  Thus, in cases where the object has not 
   * been added to a model or the model itself is incomplete,
   * unit analysis is not possible and this method will return @c NULL.
   *
   * @warning Note that it is possible the "math" expression in the
   * EventAssignment contains literal numbers or parameters with undeclared
   * units.  In those cases, it is not possible to calculate the units of
   * the overall expression without making assumptions.  LibSBML does not
   * make assumptions about the units, and
   * EventAssignment::getDerivedUnitDefinition() only returns the units as
   * far as it is able to determine them.  For example, in an expression
   * <em>X + Y</em>, if <em>X</em> has unambiguously-defined units and
   * <em>Y</em> does not, it will return the units of <em>X</em>.  When
   * using this method, <strong>it is critical that callers also invoke the
   * method</strong> EventAssignment::containsUndeclaredUnits() <strong>to
   * determine whether this situation holds</strong>.  Callers should take
   * suitable action in those situations.
   * 
   * @return a UnitDefinition that expresses the units of the math 
   * expression of this EventAssignment, or @c NULL if one cannot be constructed.
   *
   * @see containsUndeclaredUnits()
   */
  UnitDefinition * getDerivedUnitDefinition();


  /**
   * Calculates and returns a UnitDefinition that expresses the units
   * of measurement assumed for the "math" expression of this
   * EventAssignment.
   *
   * The units are calculated based on the mathematical expression in the
   * EventAssignment and the model quantities referenced by
   * <code>&lt;ci&gt;</code> elements used within that expression.  The
   * EventAssignment::getDerivedUnitDefinition() method returns the
   * calculated units.
   *
   * Note that the functionality that facilitates unit analysis depends 
   * on the model as a whole.  Thus, in cases where the object has not 
   * been added to a model or the model itself is incomplete,
   * unit analysis is not possible and this method will return @c NULL.
   *
   * @warning Note that it is possible the "math" expression in the
   * EventAssignment contains literal numbers or parameters with undeclared
   * units.  In those cases, it is not possible to calculate the units of
   * the overall expression without making assumptions.  LibSBML does not
   * make assumptions about the units, and
   * EventAssignment::getDerivedUnitDefinition() only returns the units as
   * far as it is able to determine them.  For example, in an expression
   * <em>X + Y</em>, if <em>X</em> has unambiguously-defined units and
   * <em>Y</em> does not, it will return the units of <em>X</em>.  When
   * using this method, <strong>it is critical that callers also invoke the
   * method</strong> EventAssignment::containsUndeclaredUnits() <strong>to
   * determine whether this situation holds</strong>.  Callers should take
   * suitable action in those situations.
   * 
   * @return a UnitDefinition that expresses the units of the math 
   * expression of this EventAssignment, or @c NULL if one cannot be constructed.
   *
   * @see containsUndeclaredUnits()
   */
  const UnitDefinition * getDerivedUnitDefinition() const;


  /**
   * Predicate returning @c true if the math
   * expression of this EventAssignment contains literal numbers or
   * parameters with undeclared units.
   *
   * The EventAssignment::getDerivedUnitDefinition() method returns what
   * libSBML computes to be the units of the "math", to the extent that
   * libSBML can compute them.  However, if the expression contains literal
   * numbers or parameters with undeclared units, libSBML may not be able
   * to compute the full units of the expression and will only return what
   * it can compute.  Callers should always use
   * EventAssignment::containsUndeclaredUnits() when using
   * EventAssignment::getDerivedUnitDefinition() to decide whether the
   * returned units may be incomplete.
   * 
   * @return @c true if the math expression of this EventAssignment
   * includes parameters/numbers 
   * with undeclared units, @c false otherwise.
   *
   * @note A return value of @c true indicates that the UnitDefinition
   * returned by EventAssignment::getDerivedUnitDefinition() may not
   * accurately represent the units of the expression.
   *
   * @see getDerivedUnitDefinition()
   */
  bool containsUndeclaredUnits();


  /**
   * Predicate returning @c true if the math
   * expression of this EventAssignment contains literal numbers or
   * parameters with undeclared units.
   *
   * The EventAssignment::getDerivedUnitDefinition() method returns what
   * libSBML computes to be the units of the "math", to the extent that
   * libSBML can compute them.  However, if the expression contains literal
   * numbers or parameters with undeclared units, libSBML may not be able
   * to compute the full units of the expression and will only return what
   * it can compute.  Callers should always use
   * EventAssignment::containsUndeclaredUnits() when using
   * EventAssignment::getDerivedUnitDefinition() to decide whether the
   * returned units may be incomplete.
   * 
   * @return @c true if the math expression of this EventAssignment
   * includes parameters/numbers 
   * with undeclared units, @c false otherwise.
   *
   * @note A return value of @c true indicates that the UnitDefinition
   * returned by EventAssignment::getDerivedUnitDefinition() may not
   * accurately represent the units of the expression.
   *
   * @see getDerivedUnitDefinition()
   */
  bool containsUndeclaredUnits() const;


  /**
   * Returns the libSBML type code of this object instance.
   *
   * @if clike LibSBML attaches an identifying code to every
   * kind of SBML object.  These are known as <em>SBML type codes</em>.
   * The set of possible type codes is defined in the enumeration
   * #SBMLTypeCode_t.  The names of the type codes all begin with the
   * characters @c SBML_. @endif@if java LibSBML attaches an
   * identifying code to every kind of SBML object.  These are known as
   * <em>SBML type codes</em>.  In other languages, the set of type codes
   * is stored in an enumeration; in the Java language interface for
   * libSBML, the type codes are defined as static integer constants in
   * interface class {@link libsbmlConstants}.  The names of the type codes
   * all begin with the characters @c SBML_. @endif
   *
   * @return the SBML type code for this object, or @link SBMLTypeCode_t#SBML_UNKNOWN SBML_UNKNOWN@endlink (default).
   *
   * @see getElementName()
   */
  virtual SBMLTypeCode_t getTypeCode () const;


  /**
   * Returns the XML element name of this object, which for
   * EventAssignment, is always @c "eventAssignment".
   * 
   * @return the name of this element, i.e., @c "eventAssignment". 
   */
  virtual const std::string& getElementName () const;


  /** @cond doxygen-libsbml-internal */
  /**
   * Subclasses should override this method to write out their contained
   * SBML objects as XML elements.  Be sure to call your parents
   * implementation of this method as well.
   */
  virtual void writeElements (XMLOutputStream& stream) const;
  /** @endcond */


  /**
   * Predicate returning @c true if
   * all the required attributes for this EventAssignment object
   * have been set.
   *
   * @note The required attributes for a EventAssignment object are:
   * @li "variable"
   *
   * @return a boolean value indicating whether all the required
   * attributes for this object have been defined.
   */
  virtual bool hasRequiredAttributes() const;


  /**
   * Predicate returning @c true if
   * all the required elements for this EventAssignment object
   * have been set.
   *
   * @note The required elements for a EventAssignment object are:
   * @li "math"
   *
   * @return a boolean value indicating whether all the required
   * elements for this object have been defined.
   */
  virtual bool hasRequiredElements() const ;


  /** @cond doxygen-libsbml-internal */
  /*
   * Overload use of getId to retrieve variable
   */
  std::string getId() const { return mVariable; };
  /** @endcond */


protected:
  /** @cond doxygen-libsbml-internal */

  /* this is a constructor that takes no arguments and 
   * only exists because the validator code needs it
   */
  EventAssignment ();


  /**
   * Subclasses should override this method to read (and store) XHTML,
   * MathML, etc. directly from the XMLInputStream.
   *
   * @return true if the subclass read from the stream, false otherwise.
   */
  virtual bool readOtherXML (XMLInputStream& stream);


  /**
   * Subclasses should override this method to read values from the given
   * XMLAttributes set into their specific fields.  Be sure to call your
   * parents implementation of this method as well.
   */
  virtual void readAttributes (const XMLAttributes& attributes);

  void readL2Attributes (const XMLAttributes& attributes);
  
  void readL3Attributes (const XMLAttributes& attributes);


  /**
   * Subclasses should override this method to write their XML attributes
   * to the XMLOutputStream.  Be sure to call your parents implementation
   * of this method as well.
   */
  virtual void writeAttributes (XMLOutputStream& stream) const;


  std::string  mVariable;
  ASTNode*     mMath;

  /* the validator classes need to be friends to access the 
   * protected constructor that takes no arguments
   */
  friend class Validator;
  friend class ConsistencyValidator;
  friend class IdentifierConsistencyValidator;
  friend class InternalConsistencyValidator;
  friend class L1CompatibilityValidator;
  friend class L2v1CompatibilityValidator;
  friend class L2v2CompatibilityValidator;
  friend class L2v3CompatibilityValidator;
  friend class L2v4CompatibilityValidator;
  friend class MathMLConsistencyValidator;
  friend class ModelingPracticeValidator;
  friend class OverdeterminedValidator;
  friend class SBOConsistencyValidator;
  friend class UnitConsistencyValidator;

  /** @endcond */
};



class LIBSBML_EXTERN ListOfEventAssignments : public ListOf
{
public:

  /**
   * Creates and returns a deep copy of this ListOfEventAssignments.
   *
   * @return a (deep) copy of this ListOfEventAssignments.
   */
  virtual ListOfEventAssignments* clone () const;


  /**
   * Returns the libSBML type code for this %SBML object.
   *
   * @if clike LibSBML attaches an identifying code to every
   * kind of SBML object.  These are known as <em>SBML type codes</em>.
   * The set of possible type codes is defined in the enumeration
   * #SBMLTypeCode_t.  The names of the type codes all begin with the
   * characters @c SBML_. @endif@if java LibSBML attaches an
   * identifying code to every kind of SBML object.  These are known as
   * <em>SBML type codes</em>.  In other languages, the set of type codes
   * is stored in an enumeration; in the Java language interface for
   * libSBML, the type codes are defined as static integer constants in
   * interface class {@link libsbmlConstants}.  The names of the type codes
   * all begin with the characters @c SBML_. @endif
   *
   * @return the SBML type code for this object, or @link SBMLTypeCode_t#SBML_UNKNOWN SBML_UNKNOWN@endlink (default).
   *
   * @see getElementName()
   */
  virtual SBMLTypeCode_t getTypeCode () const { return SBML_LIST_OF; };


  /**
   * Returns the libSBML type code for the objects contained in this ListOf
   * (i.e., EventAssignment objects, if the list is non-empty).
   *
   * @if clike LibSBML attaches an identifying code to every
   * kind of SBML object.  These are known as <em>SBML type codes</em>.
   * The set of possible type codes is defined in the enumeration
   * #SBMLTypeCode_t.  The names of the type codes all begin with the
   * characters @c SBML_. @endif@if java LibSBML attaches an
   * identifying code to every kind of SBML object.  These are known as
   * <em>SBML type codes</em>.  In other languages, the set of type codes
   * is stored in an enumeration; in the Java language interface for
   * libSBML, the type codes are defined as static integer constants in
   * interface class {@link libsbmlConstants}.  The names of the type codes
   * all begin with the characters @c SBML_. @endif
   * 
   * @return the SBML type code for the objects contained in this ListOf
   * instance, or @link SBMLTypeCode_t#SBML_UNKNOWN SBML_UNKNOWN@endlink (default).
   *
   * @see getElementName()
   */
  virtual SBMLTypeCode_t getItemTypeCode () const;


  /**
   * Returns the XML element name of this object.
   *
   * For ListOfEventAssignments, the XML element name is @c
   * "listOfEventAssignments".
   * 
   * @return the name of this element, i.e., @c "listOfEventAssignments".
   */
  virtual const std::string& getElementName () const;


  /**
   * Get a EventAssignment from the ListOfEventAssignments.
   *
   * @param n the index number of the EventAssignment to get.
   * 
   * @return the nth EventAssignment in this ListOfEventAssignments.
   *
   * @see size()
   */
  virtual EventAssignment * get(unsigned int n); 


  /**
   * Get a EventAssignment from the ListOfEventAssignments.
   *
   * @param n the index number of the EventAssignment to get.
   * 
   * @return the nth EventAssignment in this ListOfEventAssignments.
   *
   * @see size()
   */
  virtual const EventAssignment * get(unsigned int n) const; 

  /**
   * Get a EventAssignment from the ListOfEventAssignments
   * based on its identifier.
   *
   * @param sid a string representing the identifier 
   * of the EventAssignment to get.
   * 
   * @return EventAssignment in this ListOfEventAssignments
   * with the given id or @c NULL if no such
   * EventAssignment exists.
   *
   * @see get(unsigned int n)
   * @see size()
   */
  virtual EventAssignment* get (const std::string& sid);


  /**
   * Get a EventAssignment from the ListOfEventAssignments
   * based on its identifier.
   *
   * @param sid a string representing the identifier 
   * of the EventAssignment to get.
   * 
   * @return EventAssignment in this ListOfEventAssignments
   * with the given id or @c NULL if no such
   * EventAssignment exists.
   *
   * @see get(unsigned int n)
   * @see size()
   */
  virtual const EventAssignment* get (const std::string& sid) const;


  /**
   * Removes the nth item from this ListOfEventAssignments items and returns a pointer to
   * it.
   *
   * The caller owns the returned item and is responsible for deleting it.
   *
   * @param n the index of the item to remove
   *
   * @see size()
   */
  virtual EventAssignment* remove (unsigned int n);


  /**
   * Removes item in this ListOfEventAssignments items with the given identifier.
   *
   * The caller owns the returned item and is responsible for deleting it.
   * If none of the items in this list have the identifier @p sid, then @c
   * NULL is returned.
   *
   * @param sid the identifier of the item to remove
   *
   * @return the item removed.  As mentioned above, the caller owns the
   * returned item.
   */
  virtual EventAssignment* remove (const std::string& sid);


  /** @cond doxygen-libsbml-internal */

  /**
   * Get the ordinal position of this element in the containing object
   * (which in this case is the Model object).
   * 
   * @return the ordinal position of the element with respect to its
   * siblings, or @c -1 (default) to indicate the position is not significant.
   */
  virtual int getElementPosition () const;

  /** @endcond */


protected:
  /** @cond doxygen-libsbml-internal */

  /**
   * @return the SBML object corresponding to next XMLToken in the
   * XMLInputStream or NULL if the token was not recognized.
   */
  virtual SBase* createObject (XMLInputStream& stream);

  /** @endcond */
};

LIBSBML_CPP_NAMESPACE_END

#endif  /* __cplusplus */


#ifndef SWIG

LIBSBML_CPP_NAMESPACE_BEGIN
BEGIN_C_DECLS

/*-----------------------------------------------------------------------------
 * See the .cpp file for the documentation of the following functions.
 *---------------------------------------------------------------------------*/

/*
LIBSBML_EXTERN
EventAssignment_t *
EventAssignment_createWithLevelVersionAndNamespaces (unsigned int level,
              unsigned int version, XMLNamespaces_t *xmlns);
*/

LIBSBML_EXTERN
EventAssignment_t *
EventAssignment_create (unsigned int level, unsigned int version);


LIBSBML_EXTERN
EventAssignment_t *
EventAssignment_createWithNS (SBMLNamespaces_t *sbmlns);


LIBSBML_EXTERN
void
EventAssignment_free (EventAssignment_t *ea);


LIBSBML_EXTERN
EventAssignment_t *
EventAssignment_clone (const EventAssignment_t *ea);


LIBSBML_EXTERN
const XMLNamespaces_t *
EventAssignment_getNamespaces(EventAssignment_t *c);


LIBSBML_EXTERN
const char *
EventAssignment_getVariable (const EventAssignment_t *ea);


LIBSBML_EXTERN
const ASTNode_t *
EventAssignment_getMath (const EventAssignment_t *ea);


LIBSBML_EXTERN
int
EventAssignment_isSetVariable (const EventAssignment_t *ea);


LIBSBML_EXTERN
int
EventAssignment_isSetMath (const EventAssignment_t *ea);


LIBSBML_EXTERN
int
EventAssignment_setVariable (EventAssignment_t *ea, const char *sid);


LIBSBML_EXTERN
int
EventAssignment_setMath (EventAssignment_t *ea, const ASTNode_t *math);


LIBSBML_EXTERN
UnitDefinition_t * 
EventAssignment_getDerivedUnitDefinition(EventAssignment_t *ea);


LIBSBML_EXTERN
int 
EventAssignment_containsUndeclaredUnits(EventAssignment_t *ea);


LIBSBML_EXTERN
EventAssignment_t *
ListOfEventAssignments_getById (ListOf_t *lo, const char *sid);


LIBSBML_EXTERN
EventAssignment_t *
ListOfEventAssignments_removeById (ListOf_t *lo, const char *sid);


END_C_DECLS
LIBSBML_CPP_NAMESPACE_END

#endif  /* !SWIG */
#endif  /* EventAssignment_h */
