/* ----------------------------------------------------------------------------
 * This file was automatically generated by SWIG (http://www.swig.org).
 * Version 2.0.0
 *
 * Do not make changes to this file unless you know what you are doing--modify
 * the SWIG interface file instead.
 * ----------------------------------------------------------------------------- */

package org.sbml.libsbml;

/** 
 * LibSBML implementation of SBML's Trigger construct for Event.
 * <p>
 * An {@link Event} object defines when the event can occur, the variables that are
 * affected by the event, and how the variables are affected.  The {@link Trigger}
 * construct in SBML is used to define a mathematical expression that
 * determines when an {@link Event} is <em>triggered</em>.
 * <p>
 * A {@link Trigger} object in SBML Level&nbsp;2 and Level&nbsp;3 contains one
 * subelement named 'math' containing a MathML expression.  The expression
 * must evaluate to a value of type <code>boolean.</code>  The exact moment at which
 * the expression evaluates to <code>true</code> is the time point when the {@link Event} is
 * <em>triggered</em>.  In SBML Level&nbsp;3, {@link Trigger} has additional attributes
 * that must be assigned values; they are discussed in a separate section
 * below.
 * <p>
 * An event only <em>triggers</em> when its {@link Trigger} expression makes the
 * transition in value from <code>false</code> to <code>true.</code>  The event will also
 * trigger at any subsequent time points when the trigger makes this
 * transition; in other words, an event can be triggered multiple times
 * during a simulation if its trigger condition makes the transition from
 * <code>false</code> to <code>true</code> more than once.  In SBML Level&nbsp;3, the behavior
 * at the very start of simulation (i.e., at <em>t = 0</em>, where
 * <em>t</em> stands for time) is determined in part by the boolean flag
 * 'initialValue'.  This and other additional features introduced in SBML
 * Level&nbsp;3 are discussed further below.
 * <p>
 * <h2>Version differences</h2>
 * <p>
 * SBML Level&nbsp;3 Version&nbsp;1 introduces two required attributes
 * on the {@link Trigger} object: 'persistent' and 'initialValue'.  The rest of
 * this introduction describes these two attributes.
 * <p>
 * <h3>The 'persistent' attribute on {@link Trigger}</h3>
 * <p>
 * In the interval between when an {@link Event} object <em>triggers</em> (i.e.,
 * its {@link Trigger} object expression transitions in value from <code>false</code> to
 * <code>true</code>) and when its assignments are to be <em>executed</em>, conditions
 * in the model may change such that the trigger expression transitions
 * back from <code>true</code> to <code>false.</code>  Should the event's assignments still be
 * made if this happens?  Answering this question is the purpose of the
 * 'persistent' attribute on {@link Trigger}.
 * <p>
 * If the boolean attribute 'persistent' has a value of <code>true</code>, then once
 * the event is triggered, all of its assignments are always performed when
 * the time of execution is reached.  The name <em>persistent</em> is meant to
 * evoke the idea that the trigger expression does not have to be
 * re-checked after it triggers if 'persistent'=<code>true.</code>  Conversely, if
 * the attribute value is <code>false</code>, then the trigger expression is not
 * assumed to persist: if the expression transitions in value back to 
 * <code>false</code> at any time between when the event triggered and when it is to be
 * executed, the event is no longer considered to have triggered and its
 * assignments are not executed.  (If the trigger expression transitions
 * once more to <code>true</code> after that point, then the event is triggered, but
 * this then constitutes a whole new event trigger-and-execute sequence.)
 * <p>
 * The 'persistent' attribute can be especially useful when {@link Event} objects
 * contain {@link Delay} objects, but it is relevant even in a model without delays
 * if the model contains two or more events.  As explained in the
 * introduction to this section, the operation of all events in SBML
 * (delayed or not) is conceptually divided into two phases,
 * <em>triggering</em> and <em>execution</em>; however, unless events have
 * priorities associated with them, SBML does not mandate a particular
 * ordering of event execution in the case of simultaneous events.  Models
 * with multiple events can lead to situations where the execution of one
 * event affects another event's trigger expression value.  If that other
 * event has 'persistent'=<code>false</code>, and its trigger expression evaluates to
 * <code>false</code> before it is to be executed, the event must not be executed
 * after all.
 * <p>
 * <h3>The 'initialValue' attribute on {@link Trigger}</h3>
 * <p>
 * As mentioned above, an event <em>triggers</em> when the mathematical
 * expression in its {@link Trigger} object transitions in value from <code>false</code> to
 * <code>true.</code>  An unanswered question concerns what happens at the start of a
 * simulation: can event triggers make this transition at <em>t = 0</em>,
 * where <em>t</em> stands for time?
 * <p>
 * In order to determine whether an event may trigger at <em>t = 0</em>, it
 * is necessary to know what value the {@link Trigger} object's 'math' expression
 * had immediately prior to <em>t = 0</em>.  This starting value of the
 * trigger expression is determined by the value of the boolean attribute
 * 'initialValue'.  A value of <code>true</code> means the trigger expression is
 * taken to have the value <code>true</code> immediately prior to <em>t = 0</em>.  In
 * that case, the trigger cannot transition in value from <code>false</code> to 
 * <code>true</code> at the moment simulation begins (because it has the value <code>true</code>
 * both before and after <em>t = 0</em>), and can only make the transition
 * from <code>false</code> to <code>true</code> sometime <em>after</em> <em>t = 0</em>.  (To do
 * that, it would also first have to transition to <code>false</code> before it could
 * make the transition from <code>false</code> back to <code>true.</code>)  Conversely, if
 * 'initialValue'=<code>false</code>, then the trigger expression is assumed to start
 * with the value <code>false</code>, and therefore may trigger at <em>t = 0</em> if
 * the expression evaluates to <code>true</code> at that moment.
 * <p>
 * <p>
 * @see Event
 * @see Delay
 * @see EventAssignment
 */

public class Trigger extends SBase {
   private long swigCPtr;

   protected Trigger(long cPtr, boolean cMemoryOwn)
   {
     super(libsbmlJNI.Trigger_SWIGUpcast(cPtr), cMemoryOwn);
     swigCPtr = cPtr;
   }

   protected static long getCPtr(Trigger obj)
   {
     return (obj == null) ? 0 : obj.swigCPtr;
   }

   protected static long getCPtrAndDisown (Trigger obj)
   {
     long ptr = 0;

     if (obj != null)
     {
       ptr             = obj.swigCPtr;
       obj.swigCMemOwn = false;
     }

     return ptr;
   }

  protected void finalize() {
    delete();
  }

  public synchronized void delete() {
    if (swigCPtr != 0) {
      if (swigCMemOwn) {
        swigCMemOwn = false;
        libsbmlJNI.delete_Trigger(swigCPtr);
      }
      swigCPtr = 0;
    }
    super.delete();
  }

  
  /**
   * Creates a new {@link Trigger} using the given SBML <code>level</code> and <code>version</code>
   * values.
   * <p>
   * @param level a long integer, the SBML Level to assign to this {@link Trigger}
   * <p>
   * @param version a long integer, the SBML Version to assign to this
   * {@link Trigger}
   */
 public Trigger(long level, long version) throws org.sbml.libsbml.SBMLConstructorException {
    this(libsbmlJNI.new_Trigger__SWIG_0(level, version), true);
  }

  
  /**
   * Creates a new {@link Trigger} using the given {@link SBMLNamespaces} object
   * <code>sbmlns</code>.
   * <p>
   * The {@link 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
   * {@link SBMLNamespaces} object somewhere in a program, once, then pass it to
   * object constructors such as this one when needed.
   * <p>
   * @param sbmlns an {@link SBMLNamespaces} object.
   */
 public Trigger(SBMLNamespaces sbmlns) throws org.sbml.libsbml.SBMLConstructorException {
    this(libsbmlJNI.new_Trigger__SWIG_1(SBMLNamespaces.getCPtr(sbmlns), sbmlns), true);
  }

  
  /**
   * Copy constructor; creates a copy of this {@link Trigger}.
   */
 public Trigger(Trigger orig) throws org.sbml.libsbml.SBMLConstructorException {
    this(libsbmlJNI.new_Trigger__SWIG_2(Trigger.getCPtr(orig), orig), true);
  }

  
  /**
   * Creates and returns a deep copy of this {@link Trigger}.
   * <p>
   * @return a (deep) copy of this {@link Trigger}.
   */
 public Trigger cloneObject() {
    long cPtr = libsbmlJNI.Trigger_cloneObject(swigCPtr, this);
    return (cPtr == 0) ? null : new Trigger(cPtr, true);
  }

  
  /**
   * Get the mathematical formula for the trigger and return it
   * as an AST.
   * <p>
   * @return the math of this {@link Trigger}.
   */
 public ASTNode getMath() {
    long cPtr = libsbmlJNI.Trigger_getMath(swigCPtr, this);
    return (cPtr == 0) ? null : new ASTNode(cPtr, false);
  }

  
  /**
   * (SBML Level&nbsp;3 only) Get the value of the 'initialValue' attribute
   * of this {@link Trigger}.
   * <p>
   * @return the boolean value stored as the 'initialValue' attribute value
   * in this {@link Trigger}.
   * <p>
   * @note The attribute 'initialValue' is available in SBML Level&nbsp;3
   * Version&nbsp;1 Core, but is not present in lower Levels of SBML.
   */
 public boolean getInitialValue() {
    return libsbmlJNI.Trigger_getInitialValue(swigCPtr, this);
  }

  
  /**
   * (SBML Level&nbsp;3 only) Get the value of the 'persistent' attribute
   * of this {@link Trigger}.
   * <p>
   * @return the boolean value stored as the 'persistent' attribute value
   * in this {@link Trigger}.
   * <p>
   * @note The attribute 'persistent' is available in SBML Level&nbsp;3
   * Version&nbsp;1 Core, but is not present in lower Levels of SBML.
   */
 public boolean getPersistent() {
    return libsbmlJNI.Trigger_getPersistent(swigCPtr, this);
  }

  
  /**
   * Predicate to test whether the math for this trigger is set.
   * <p>
   * @return <code>true</code> if the formula (meaning the 'math' subelement) of
   * this {@link Trigger} is set, <code>false</code> otherwise.
   */
 public boolean isSetMath() {
    return libsbmlJNI.Trigger_isSetMath(swigCPtr, this);
  }

  
  /**
   * (SBML Level&nbsp;3 only) Predicate to test whether the 'initialValue'
   * attribute for this trigger is set.
   * <p>
   * @return <code>true</code> if the initialValue attribute of
   * this {@link Trigger} is set, <code>false</code> otherwise.
   * <p>
   * @note The attribute 'initialValue' is available in SBML Level&nbsp;3
   * Version&nbsp;1 Core, but is not present in lower Levels of SBML.
   */
 public boolean isSetInitialValue() {
    return libsbmlJNI.Trigger_isSetInitialValue(swigCPtr, this);
  }

  
  /**
   * (SBML Level&nbsp;3 only) Predicate to test whether the 'persistent'
   * attribute for this trigger is set.
   * <p>
   * @return <code>true</code> if the persistent attribute of
   * this {@link Trigger} is set, <code>false</code> otherwise.
   * <p>
   * @note The attribute 'persistent' is available in SBML Level&nbsp;3
   * Version&nbsp;1 Core, but is not present in lower Levels of SBML.
   */
 public boolean isSetPersistent() {
    return libsbmlJNI.Trigger_isSetPersistent(swigCPtr, this);
  }

  
  /**
   * Sets the trigger expression of this {@link Trigger} instance to a copy of the given
   * {@link ASTNode}.
   * <p>
   * @param math an {@link ASTNode} representing a formula tree.
   * <p>
   * @return integer value indicating success/failure of the
   * function.   The possible values
   * returned by this function are:
   * <li> {@link  libsbmlConstants#LIBSBML_OPERATION_SUCCESS LIBSBML_OPERATION_SUCCESS }
   * <li> {@link  libsbmlConstants#LIBSBML_INVALID_OBJECT LIBSBML_INVALID_OBJECT }
   */
 public int setMath(ASTNode math) {
    return libsbmlJNI.Trigger_setMath(swigCPtr, this, ASTNode.getCPtr(math), math);
  }

  
  /**
   * (SBML Level&nbsp;3 only) Sets the 'initialValue' attribute of this {@link Trigger} instance.
   * <p>
   * @param initialValue a boolean representing the initialValue to be set.
   * <p>
   * @return integer value indicating success/failure of the
   * function.   The possible values
   * returned by this function are:
   * <li> {@link  libsbmlConstants#LIBSBML_OPERATION_SUCCESS LIBSBML_OPERATION_SUCCESS }
   * <li> {@link  libsbmlConstants#LIBSBML_UNEXPECTED_ATTRIBUTE LIBSBML_UNEXPECTED_ATTRIBUTE }
   * <p>
   * @note The attribute 'initialValue' is available in SBML Level&nbsp;3
   * Version&nbsp;1 Core, but is not present in lower Levels of SBML.
   */
 public int setInitialValue(boolean initialValue) {
    return libsbmlJNI.Trigger_setInitialValue(swigCPtr, this, initialValue);
  }

  
  /**
   * (SBML Level&nbsp;3 only) Sets the 'persistent' attribute of this {@link Trigger} instance.
   * <p>
   * @param persistent a boolean representing the persistent value to be set.
   * <p>
   * @return integer value indicating success/failure of the
   * function.   The possible values
   * returned by this function are:
   * <li> {@link  libsbmlConstants#LIBSBML_OPERATION_SUCCESS LIBSBML_OPERATION_SUCCESS }
   * <li> {@link  libsbmlConstants#LIBSBML_UNEXPECTED_ATTRIBUTE LIBSBML_UNEXPECTED_ATTRIBUTE }
   * <p>
   * @note The attribute 'persistent' is available in SBML Level&nbsp;3
   * Version&nbsp;1 Core, but is not present in lower Levels of SBML.
   */
 public int setPersistent(boolean persistent) {
    return libsbmlJNI.Trigger_setPersistent(swigCPtr, this, persistent);
  }

  
  /**
   * Returns the libSBML type code of this object instance.
   * <p>
   * 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 the interface class {@link
   * libsbmlConstants}.  The names of the type codes all begin with the
   * characters <code>SBML_.</code> 
   * <p>
   * @return the SBML type code for this object, or {@link  libsbmlConstants#SBML_UNKNOWN SBML_UNKNOWN} (default).
   * <p>
   * @see #getElementName()
   */
 public int getTypeCode() {
    return libsbmlJNI.Trigger_getTypeCode(swigCPtr, this);
  }

  
  /**
   * Returns the XML element name of this object, which for {@link Trigger}, is
   * always <code>'trigger'.</code>
   * <p>
   * @return the name of this element, i.e., <code>'trigger'.</code> 
   */
 public String getElementName() {
    return libsbmlJNI.Trigger_getElementName(swigCPtr, this);
  }

  
  /**
   * Predicate returning <code>true</code> if
   * all the required elements for this {@link Trigger} object
   * have been set.
   * <p>
   * @note The required elements for a {@link Trigger} object are:
   * math
   * <p>
   * @return a boolean value indicating whether all the required
   * elements for this object have been defined.
   */
 public boolean hasRequiredElements() {
    return libsbmlJNI.Trigger_hasRequiredElements(swigCPtr, this);
  }

  
  /**
   * Predicate returning <code>true</code> if
   * all the required attributes for this {@link Trigger} object
   * have been set.
   * <p>
   * @note The required attributes for a {@link Trigger} object are:
   * <li> 'persistent' (required in SBML Level&nbsp;3)
   * <li> 'initialValue' (required in SBML Level&nbsp;3)
   * <p>
   * @return a boolean value indicating whether all the required
   * attributes for this object have been defined.
   */
 public boolean hasRequiredAttributes() {
    return libsbmlJNI.Trigger_hasRequiredAttributes(swigCPtr, this);
  }

}
