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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 real variables.
*/
public interface VarReal extends ConstrainedVariable {
/**
* 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 the current minimum value in the domain of this variable.
* @return the current minimum value in the domain of this variable.
*/
public double getMin();
/**
* Returns the current maximum value in the domain of this variable.
* @return the current maximum value in the domain of this variable.
*/
public double 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 double getValue();
/**
* Removes a range of values from the domain of this variable,
* throws an exception if unsuccessful.
* @param min the minimum value of the range to be removed from the domain of this variable.
* @param max the maximum value of the range to be removed from the domain of this variable.
* @throws Exception if the value is not present in the domain of this variable.
*/
public void removeRange(double min, double max) throws Exception;
/**
* 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 the current size of the domain of this variable.
// * @return the current size of the domain of this variable.
// */
// public double getDomainSize();
/**
* Adds and 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 plus(double value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this + var.
*/
public VarReal plus(VarReal var);
/**
* Adds and 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 plus(int value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this + var.
*/
public VarReal plus(Var var);
/**
* Adds and 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 minus(double value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this - var.
*/
public VarReal minus(VarReal var);
/**
* Adds and 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 minus(int value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this - var.
*/
public VarReal minus(Var var);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this * value.
*/
public VarReal multiply(double value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this * var.
*/
public VarReal multiply(VarReal var);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this * value.
*/
public VarReal multiply(int value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this * var.
*/
public VarReal multiply(Var var);
/**
* Adds and 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 divide(double value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this / var.
* @throws Exception if dividing by zero.
*/
public VarReal divide(VarReal var) throws Exception;
/**
* Adds and 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 divide(int value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this / var.
* @throws Exception if dividing by zero.
*/
public VarReal divide(Var var) throws Exception;
/**
* Adds and returns a new VarReal that is constrained to be the negation of this variable, i.e. 0 - this.
* @return a VarReal that represents: 0 - this.
*/
public VarReal negative();
/**
* Adds and returns a new VarReal that is constrained to be the absolute value of this variable.
* @return a VarReal that represents the absolute value of this variable.
*/
public VarReal abs();
/**
* Adds and returns a new VarReal that is constrained to be the product of this variable
* and itself, i.e. this * this.
* @return a VarReal that represents: this * this.
*/
public VarReal sqr();
/**
* Adds and returns a new VarReal 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 VarReal that represents: this^value.
*/
public VarReal power(double value);
/**
* Adds and returns a new VarReal 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 VarReal that represents: this^value.
*/
public VarReal power(int value);
// /**
// * Adds and returns a new VarReal that is constrained to be this variable raised to the power of the given variable,
// * i.e. this^var.
// * @param var the given variable.
// * @return a VarReal that represents: this^var.
// */
// public VarReal power(Var var);
//
// /**
// * Adds and returns a new VarReal that is constrained to be this variable raised to the power of the given real variable,
// * i.e. this^var.
// * @param var the given real variable.
// * @return a VarReal that represents: this^var.
// */
// public VarReal power(VarReal var);
}