62 lines
1.8 KiB
Java
62 lines
1.8 KiB
Java
|
//: patterns/chain/ChainOfResponsibility2.java
|
||
|
|
// Using the Functional interface.
|
||
|
|
package patterns.chain;
|
||
|
|
import java.util.*;
|
||
|
|
import java.util.function.*;
|
||
|
|
import static net.mindview.util.PrintArray.*;
|
||
|
|
|
||
|
|
class FindMinima2 {
|
||
|
|
public static Result leastSquares(double[] line) {
|
||
|
|
System.out.println("LeastSquares.algorithm");
|
||
|
|
boolean weSucceed = false;
|
||
|
|
if(weSucceed) // Actual test/calculation here
|
||
|
|
return new Result(new double[] { 1.1, 2.2 });
|
||
|
|
else // Try the next one in the chain:
|
||
|
|
return new Fail();
|
||
|
|
}
|
||
|
|
public static Result perturbation(double[] line) {
|
||
|
|
System.out.println("Perturbation.algorithm");
|
||
|
|
boolean weSucceed = false;
|
||
|
|
if(weSucceed) // Actual test/calculation here
|
||
|
|
return new Result(new double[] { 3.3, 4.4 });
|
||
|
|
else
|
||
|
|
return new Fail();
|
||
|
|
}
|
||
|
|
public static Result bisection(double[] line) {
|
||
|
|
System.out.println("Bisection.algorithm");
|
||
|
|
boolean weSucceed = true;
|
||
|
|
if(weSucceed) // Actual test/calculation here
|
||
|
|
return new Result(new double[] { 5.5, 6.6 });
|
||
|
|
else
|
||
|
|
return new Fail();
|
||
|
|
}
|
||
|
|
static List<Function<double[], Result>> algorithms =
|
||
|
|
Arrays.asList(
|
||
|
|
FindMinima2::leastSquares,
|
||
|
|
FindMinima2::perturbation,
|
||
|
|
FindMinima2::bisection
|
||
|
|
);
|
||
|
|
public static Result minima(double[] line) {
|
||
|
|
for (Function<double[], Result> alg : algorithms) {
|
||
|
|
Result result = alg.apply(line);
|
||
|
|
if(result.success)
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
return new Fail();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public class ChainOfResponsibility2 {
|
||
|
|
public static void main(String args[]) {
|
||
|
|
FindMinima solver = new FindMinima();
|
||
|
|
double[] line = {
|
||
|
|
1.0, 2.0, 1.0, 2.0, -1.0,
|
||
|
|
3.0, 4.0, 5.0, 4.0 };
|
||
|
|
Result result = solver.minima(line);
|
||
|
|
if(result.success)
|
||
|
|
printArray(result.line);
|
||
|
|
else
|
||
|
|
System.out.println("No algorithm found");
|
||
|
|
}
|
||
|
|
} ///:~
|