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JCP Standard JSR331 “Java Constraint Programming API”. It is used for Modeling and Solving Constraint Satisfaction and Optimization Problems using Java and off-the-shelf Constraint/Linear Solvers
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//=============================================
// J A V A C O M M U N I T Y P R O C E S S
//
// J S R 3 3 1
//
// Specification
//
//=============================================
package javax.constraints;
/**
* This interface represents constrained integer variables, the most frequently
* used type of constrained objects.
*
*/
public interface Var extends ConstrainedVariable {
/**
* Returns the current minimum value in the domain of this variable.
*
* @return the current minimum value in the domain of this variable.
*/
public int getMin();
/**
* Returns the current maximum value in the domain of this variable.
*
* @return the current maximum value in the domain of this variable.
*/
public int getMax();
/**
* Returns the value to which this variable has been instantiated, throws a
* RuntimeException if the variable is not instantiated.
*
* @return the value of this instantiated variable.
* @throws RuntimeException
* if this variable is not instantiated.
*/
public int getValue();
/**
* Returns true if the domain of the variable contains only one value.
*
* @return true if the domain of the variable contains only one value.
*/
public boolean isBound();
/**
* Returns a string representation of the initial domain of this variable.
*
* @return a string representation of the initial domain of this variable.
*/
public String getInitialDomain();
/**
* Returns true if the domain of this variable contains the value.
* @return true if the value is in the domain of this variable
*/
public boolean contains(int value);
// /**
// * Returns a Constraint that represents that this variable must be
// * equal to the given variable, i.e. this == var.
// *
// * @param var
// * the given variable.
// * @return a Constraint that represents: this == var.
// */
// public Constraint eq(Var var);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * equal to the given value i.e. this == value.
// *
// * @param value
// * the given value.
// * @return a Constraint that represents: this == value.
// */
// public Constraint eq(int value);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * less than or equal to the given variable, i.e. this <= var.
// *
// * @param var
// * the given variable.
// * @return a Constraint that represents: this <= var.
// */
// public Constraint le(Var var);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * less than or equal to the given value, i.e. this <= value.
// *
// * @param value
// * the given value.
// * @return a Constraint that represents: this <= value.
// */
// public Constraint le(int value);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * less than the given variable, i.e. this < var.
// *
// * @param var
// * the given variable.
// * @return a Constraint that represents: this < var.
// */
// public Constraint lt(Var var);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * less than the given value, i.e. this < value.
// *
// * @param value
// * the given value.
// * @return a Constraint that represents: this < value.
// */
// public Constraint lt(int value);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * greater than or equal to the given variable, i.e. this >= var.
// *
// * @param var
// * the given variable.
// * @return a Constraint that represents: this >= var.
// */
// public Constraint ge(Var var);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * greater than or equal to the given value, i.e. this >= value.
// *
// * @param value
// * the given value.
// * @return a Constraint that represents: this >= value.
// */
// public Constraint ge(int value);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * greater than the given variable, i.e. this >= var.
// *
// * @param var
// * the given variable.
// * @return a Constraint that represents: this >= var.
// */
// public Constraint gt(Var var);
//
// /**
// * Returns a Constraint that represents that this variable must be
// * greater than the given value, i.e. this > value.
// *
// * @param value
// * the given value.
// * @return a Constraint that represents: this > value.
// */
// public Constraint gt(int value);
//
// /**
// * Returns a Constraint that represents that this variable must not
// * be equal to the given variable, i.e. this != var.
// *
// * @param var
// * the given variable.
// * @return a Constraint that represents: this != var.
// */
// public Constraint neq(Var var);
//
// /**
// * Returns a Constraint that represents that this variable must not
// * be equal to the given value, i.e. this != value.
// *
// * @param value
// * the given value.
// * @return a Constraint that represents: this != value.
// */
// public Constraint neq(int value);
/**
* Returns a new Var that is constrained to be the sum of this
* variable and the given value, i.e. this + value.
*
* @param value
* the given value.
* @return a Var that represents: this + value.
*/
public Var plus(int value);
/**
* Returns a new Var that is constrained to be the sum of this
* variable and the given variable, i.e. this + var.
*
* @param var
* the given variable.
* @return a Var that represents: this + var.
*/
public Var plus(Var var);
/**
* Returns a new Var that is constrained to be the difference of
* this variable and the given value, i.e. this - value.
*
* @param value
* the given value.
* @return a Var that represents: this - value.
*/
public Var minus(int value);
/**
* Returns a new Var that is constrained to be the difference of
* this variable and the given variable, i.e. this - var.
*
* @param var
* the given variable.
* @return a Var that represents: this - var.
*/
public Var minus(Var var);
/**
* Returns a new Var that is constrained to be the product of this
* variable and the given value, i.e. this * value.
*
* @param value
* the given value.
* @return a Var that represents: this * value.
*/
public Var multiply(int value);
/**
* Returns a new Var that is constrained to be the product of this
* variable and the given variable, i.e. this * var.
*
* @param var
* the given variable.
* @return a Var that represents: this * var.
*/
public Var multiply(Var var);
/**
* Returns a new Var that is constrained to be the division of this
* variable by the given value, i.e. this / value.
*
* @param value
* the given value.
* @return a Var that represents: this / value.
*/
public Var divide(int value);
/**
* Returns a new Var that is constrained to be the division of this
* variable by the given variable, i.e. this / var.
*
* @param var
* the given variable.
* @return a Var that represents: this / var.
* @throws Exception
* if dividing by zero.
*/
public Var divide(Var var) throws Exception;
/**
* Returns a new Var that is constrained to be a "percent" of this variable.
*
* @param percent the given percent.
* @return a Var that represents: percent of var.
*/
public Var percent(int percent);
/**
* Returns a new Var that is constrained to be the remainder after
* performing integer division of this variable by the given value, i.e.
* mod(this,value).
*
* @param value
* the given value.
* @return a Var that represents: mod(this,value).
*/
public Var mod(int value);
/**
* Returns a new Var that is constrained to be the negation of
this variable, i.e. 0 - this.
* @return a Var that represents: 0 - this.
*/
public Var negative();
/**
* Returns a new Var that is constrained to be the absolute value
* of this variable.
*
* @return a Var that represents the absolute value of this variable.
*/
public Var abs();
/**
* Returns a new Var that is constrained to be the product of this
* variable and itself, i.e. this * this.
*
* @return a Var that represents: this * this.
*/
public Var sqr();
/**
* Returns a new Var that is constrained to be this variable raised
* to the power of the given value, i.e. this**value.
*
* @param value
* the given value.
* @return a Var that represents: this**value.
*/
public Var power(int value);
/**
* Returns the current number of values inside the domain of this variable.
*
* @return the current number of values inside the domain of this variable.
*/
public int getDomainSize();
/**
* Returns the type of this variable's domain.
*
* @return the type of this variable's domain.
*/
public DomainType getDomainType();
/**
* Changes the domain type of this variable. Setting domain type
* AFTER a variable was created allows to take into consideration posted constraints
* and other problem state specific information.
* @param type
*/
public void setDomainType(DomainType type);
/**
* @return a VarReal variable equals to the current integer constrained
*/
public VarReal asReal();
// /**
// * Returns a Constraint that represents that this variable must
// be equal to the given value
// * i.e. this == value.
// * @param value the given value.
// * @return a Constraint that represents: this == value.
// */
// public Constraint eq(double value);
// /**
// * returns a Constraint that represents that this variable must
// be equal to the real variable
// * i.e. this == var.
// * @param var the given real variable.
// * @return a Constraint that represents: this == var.
// */
// public Constraint eq(VarReal var);
// /**
// * returns a Constraint that represents that this variable must
// not be equal to the given value
// * i.e. this != value.
// * @param value the given value.
// * @return a Constraint that represents: this != value.
// */
// public Constraint neq(double value);
// /**
// * returns a Constraint that represents that this variable must
// not be equal to the real variable
// * i.e. this != var.
// * @param var the given real variable.
// * @return a Constraint that represents: this != var.
// */
// public Constraint neq(VarReal var);
// /**
// * returns a new VarReal that is constrained to be the sum of
// this variable
// * and the given value, i.e. this + value.
// * @param value the given value.
// * @return a VarReal that represents: this + value.
// */
// public VarReal add(double value);
// /**
// * returns a new VarReal that is constrained to be the sum of
// this variable
// * and the given real variable, i.e. this + var.
// * @param var the given real variable.
// * @return a VarReal that represents: this + var.
// */
// public VarReal add(VarReal var);
// /**
// * returns a new VarReal that is constrained to be the difference
// of this variable
// * and the given value, i.e. this - value.
// * @param value the given value.
// * @return a VarReal that represents: this - value.
// */
// public VarReal sub(double value);
// /**
// * returns a new VarReal that is constrained to be the difference
// of this variable
// * and the given real variable, i.e. this - var.
// * @param var the given real variable.
// * @return a VarReal that represents: this - var.
// */
// public VarReal sub(VarReal var);
// /**
// * returns a new VarReal that is constrained to be the division
// of this variable
// * by the given value, i.e. this / value.
// * @param value the given value.
// * @return a VarReal that represents: this / value.
// */
// public VarReal div(double value);
// /**
// * returns a Constraint that represents that this variable must
// be greater than
// * or equal to the given real variable, i.e. this >= var.
// * @param var the given real variable.
// * @return a Constraint that represents: this >= var.
// */
// public Constraint ge(VarReal var);
// /**
// * returns a Constraint that represents that this variable must
// be greater than
// * or equal to the given real value, i.e. this >= value.
// * @param value the given real value.
// * @return a Constraint that represents: this >= value.
// */
// public Constraint ge(double value);
// /**
// * returns a Constraint that represents that this variable must
// be greater than
// * the given real variable, i.e. this >= var.
// * @param var the given real variable.
// * @return a Constraint that represents: this >= var.
// */
// public Constraint gt(VarReal var);
// /**
// * Returns a Constraint that represents that this variable must
// be greater than
// * the given real value, i.e. this > value.
// * @param value the given real value.
// * @return a Constraint that represents: this > value.
// */
// public Constraint gt(double value);
// /**
// * Returns a Constraint that represents that this variable must
// be less than or
// * equal to the given real variable, i.e. this <= var.
// * @param var the given real variable.
// * @return a Constraint that represents: this <= var.
// */
// public Constraint le(VarReal var);
// /**
// * Returns a Constraint that represents that this variable must
// be less than or
// * equal to the given real value, i.e. this <= value.
// * @param value the given real value.
// * @return a Constraint that represents: this <= value.
// */
// public Constraint le(double value);
// /**
// * Returns a Constraint that represents that this variable must
// be less than
// * the given real variable, i.e. this < var.
// * @param var the given real variable.
// * @return a Constraint that represents: this < var.
// */
// public Constraint lt(VarReal var);
// /**
// * Returns a Constraint that represents that this variable must
// be less than
// * the given real value, i.e. this < value.
// * @param value the given real value.
// * @return a Constraint that represents: this < value.
// */
// public Constraint lt(double value);
// /**
// * Returns a new VarReal that is constrained to be this variable
// raised to the power of the given real value,
// * i.e. this^value.
// * @param value the given real value.
// * @return a Var that represents: this^value.
// */
// public VarReal pow(double value);
// public int compareTo(Var var);
}