hg/apidesign: samples/misuse/src/org/apidesign/misuse/projectconfig/ProjectConfigurationCorrect.java@40cabcdcd2be

     1 package org.apidesign.misuse.projectconfig;

     3 public class ProjectConfigurationCorrect {

     4     // BEGIN: misuse.prjconfig.correct

     5     interface ProjectConfigurationProvider

     6         <Configuration extends ProjectConfiguration> {

     7         public Configuration[] getConfigurations();

     8         public Configuration getActive();

     9         public void setActive(Configuration c);

    10     }

    11     interface ProjectConfiguration {

    12         public String getDisplayName();

    13     }

    14     // END: misuse.prjconfig.correct

    18     /* Following does not work:

    19     static {

    20         // BEGIN: misuse.prjconfig.correct.trivial.access

    21         ProjectConfigurationProvider<?> provider = null; // obtain elsewhere;

    22         provider.setActive(provider.getConfigurations()[0]);

    23         // END: misuse.prjconfig.correct.trivial.access

    24     }

    25     */

    27     static

    28     // BEGIN: misuse.prjconfig.correct.access

    29     {

    30         ProjectConfigurationProvider<?> provider = null; // obtain elsewhere;

    31         resetToZero(provider);

    32     }

    33     // END: misuse.prjconfig.correct.access

    35     // BEGIN: misuse.prjconfig.correct.openmethod

    36     private static <C extends ProjectConfiguration> void resetToZero(

    37         ProjectConfigurationProvider<C> provider

    38     ) {

    39         provider.setActive(provider.getConfigurations()[0]);

    40     }

    41     // END: misuse.prjconfig.correct.openmethod

    43     // BEGIN: misuse.prjconfig.correct.openclass

    44     static void workWithProjectConfigurationProvider(

    45         ProjectConfigurationProvider<?> p

    46     ) {

    47         ResetToZero<?> rtz = ResetToZero.create(p);

    48         rtz.obtainFirst();

    49         // after a while

    50         rtz.apply();

    51     }

    53     static class ResetToZero<C extends ProjectConfiguration> {

    54         C active;

    55         final ProjectConfigurationProvider<C> provider;

    57         ResetToZero(ProjectConfigurationProvider<C> provider) {

    58             this.provider = provider;

    59         }

    61         static <C extends ProjectConfiguration> ResetToZero<C> create(

    62             ProjectConfigurationProvider<C> p

    63         ) {

    64             return new ResetToZero<C>(p);

    65         }

    67         public void obtainFirst() {

    68             active = provider.getConfigurations()[0];

    69         }

    71         public void apply() {

    72             provider.setActive(active);

    73         }

    74     }

    75     // END: misuse.prjconfig.correct.openclass

    77 }

author	Jaroslav Tulach <jaroslav.tulach@apidesign.org>
	Thu, 30 Oct 2014 21:30:10 +0100
changeset 409	40cabcdcd2be
parent 209	1c999569643b
permissions	-rw-r--r--