1.1 --- a/samples/instanceofclass/src-api2.0/api/InstanceProvider.java	Sat Jun 14 10:03:34 2008 +0200
     1.2 +++ b/samples/instanceofclass/src-api2.0/api/InstanceProvider.java	Sat Jun 14 10:04:51 2008 +0200
     1.3 @@ -2,50 +2,24 @@
     1.4  package api;
     1.5  
     1.6  // BEGIN: instanceof.class.InstanceProvider2
     1.7 +public final class InstanceProvider {
     1.8 +    private final Object instance;
     1.9  
    1.10 -import java.util.Arrays;
    1.11 -import java.util.HashSet;
    1.12 -import java.util.Set;
    1.13 -import java.util.concurrent.Callable;
    1.14 -
    1.15 -public final class InstanceProvider {
    1.16 -    private final Callable<Object> instance;
    1.17 -    private final Set<String> types;
    1.18 -
    1.19 -    public InstanceProvider(Callable<Object> instance) {
    1.20 +    public InstanceProvider(Object instance) {
    1.21          this.instance = instance;
    1.22 -        this.types = null;
    1.23 -    }
    1.24 -    /** Specifies not only a factory for creating objects, but
    1.25 -     * also additional information about them.
    1.26 -     * @param instance the factory to create the object
    1.27 -     * @param type the class that the create object will be instance of
    1.28 -     * @since 2.0 
    1.29 -     */
    1.30 -    public InstanceProvider(Callable<Object> instance, String... types) {
    1.31 -        this.instance = instance;
    1.32 -        this.types = new HashSet<String>();
    1.33 -        this.types.addAll(Arrays.asList(types));
    1.34      }
    1.35      
    1.36 -    public Class<?> instanceClass() throws Exception {
    1.37 -        return instance.call().getClass();
    1.38 +    public Class<?> instanceClass() {
    1.39 +        return instance.getClass();
    1.40      }
    1.41 -    public Object instanceCreate() throws Exception {
    1.42 -        return instance.call();
    1.43 +    public Object instanceCreate() {
    1.44 +        return instance;
    1.45      }
    1.46      
    1.47 -    /** Allows to find out if the InstanceProvider creates object of given
    1.48 -     * type. This check can be done without loading the actual object or
    1.49 -     * its implementation class into memory.
    1.50 -     * 
    1.51 -     * @param c class to test 
    1.52 -     * @return if the instances produced by this provider is instance of c
    1.53 -     * @since 2.0 
    1.54 -     */
    1.55 -    public boolean isInstanceOf(Class<?> c) throws Exception {
    1.56 -        if (types != null) {
    1.57 -            return types.contains(c.getName());
    1.58 +    /** @since 2.0 */
    1.59 +    public boolean isInstanceOf(Class<?> c) {
    1.60 +        if (Helper.knownHowToDoItBetter()) {
    1.61 +            return Helper.computeTheResultOfIsInstanceOfInSomeBetterWay(c);
    1.62          } else {
    1.63              // fallback
    1.64              return c.isAssignableFrom(instanceClass());
    1.65 @@ -55,3 +29,12 @@
    1.66      
    1.67  }
    1.68  // END: instanceof.class.InstanceProvider2
    1.69 +
    1.70 +class Helper {
    1.71 +    static boolean computeTheResultOfIsInstanceOfInSomeBetterWay(Class<?> c) {
    1.72 +        return false;
    1.73 +    }
    1.74 +    static boolean knownHowToDoItBetter() {
    1.75 +        return false;
    1.76 +    }
    1.77 +}
    1.78 \ No newline at end of file