// onjava/BasicSupplier.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Supplier from a class with a zero-argument constructor
package onjava;
import java.util.function.*;
import java.lang.reflect.InvocationTargetException;
public class BasicSupplier implements Supplier {
private Class type;
public BasicSupplier(Class type) {
this.type = type;
}
@Override public T get() {
try {
// Assumes type is a public class:
return type.getConstructor().newInstance();
} catch(InstantiationException |
NoSuchMethodException |
InvocationTargetException |
IllegalAccessException e) {
throw new RuntimeException(e);
}
}
// Produce a default Supplier from a type token:
public static Supplier create(Class type) {
return new BasicSupplier<>(type);
}
}