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java - 如何摆脱 PlaceHistoryMapper

转载 作者:塔克拉玛干 更新时间:2023-11-02 20:09:44 25 4
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有没有办法不在 PlaceHistoryMapper 中定义所有 Places?目前我正在使用 Generator 来自动生成所有地点的列表,但我不确定这是正确的方法。

public class AppPlaceHistoryMapper extends AbstractPlaceHistoryMapper<Object> {

@Override
protected PrefixAndToken getPrefixAndToken(Place place) {
if (place instanceof AbstractPlace) {
return new PrefixAndToken(((AbstractPlace) place).getName(), ((AbstractPlace) place).getTokenizer()
.getToken((AbstractPlace) place));
}
throw new RuntimeException("Invalid place: " + place);
}

/**
* This method will be overrided by the gwt-generated class, so any changes made in it will not be executed
*
* @see PlaceMapperGenerator
*/
@Override
protected PlaceTokenizer<?> getTokenizer(String prefix) {
AbstractPlace[] places = {/* List of places generated by PlaceMapperGenerator */};
for (AbstractPlace p : places) {
if (p.getName().equals(prefix)) {
return p.getTokenizer();
}
}
throw new RuntimeException("Unable to find place for provided prefix: " + prefix);
}
}

生成器:

public class PlaceMapperGenerator extends Generator {

// @formatter:off
private static final String GENERATED_METHOD_TEMPLATE =
"protected com.google.gwt.place.shared.PlaceTokenizer<?> getTokenizer(String prefix) {" +
"AbstractPlace[] places = { %s };" +
"for (AbstractPlace p : places) {" +
"if (p.getName().equals(prefix)) {" +
"return p.getTokenizer();" +
"}" +
"}" +
"throw new RuntimeException(\"Unable to find place for provided prefix: \" + prefix);" +
"}"
; // @formatter:on

@Override
public String generate(TreeLogger logger, GeneratorContext context, String typeName) {
JClassType type;
try {
type = context.getTypeOracle().getType(typeName);
} catch (NotFoundException e) {
throw new RuntimeException(e);
}
String implTypeName = type.getSimpleSourceName() + "Impl";
String implPackageName = type.getPackage().getName();
ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(implPackageName,
implTypeName);
composerFactory.setSuperclass(AppPlaceHistoryMapper.class.getName());
@SuppressWarnings("resource")
PrintWriter printWriter = context.tryCreate(logger, implPackageName, implTypeName);
if (printWriter != null) {
SourceWriter sourceWriter = composerFactory.createSourceWriter(context, printWriter);
sourceWriter.print(GENERATED_METHOD_TEMPLATE, getPlaces(context));
sourceWriter.commit(logger);
printWriter.close();
}
return composerFactory.getCreatedClassName();
}

private static String getPlaces(GeneratorContext context) {
JPackage[] packages = context.getTypeOracle().getPackages();
List<String> places = new ArrayList<String>();
for (JPackage p : packages) {
if (p.getName().startsWith(AbstractPlace.class.getPackage().getName())) {
JClassType[] types = p.getTypes();
for (JClassType type : types) {
if (type.getSuperclass() != null
&& type.getSuperclass().getQualifiedSourceName().equals(AbstractPlace.class.getName())) {
places.add("new " + type.getQualifiedSourceName() + "()");
}
}
}
}
return places.toString().replaceAll("^\\[|\\]$", "");
}
}

最佳答案

恐怕要弄清楚应用程序中的 Places 和 Tokenizers 是什么,而不用维护它们的列表,唯一的方法就是像你正在做的那样使用生成器。

无论如何,我不会维护生成器,而是使用 @WithTokenizers 注释并让 GWT 生成您的 PlaceHistoryMapper 查看 GWT MVP dev-guide

@WithTokenizers({HelloPlace.Tokenizer.class, GoodbyePlace.Tokenizer.class})
public interface AppPlaceHistoryMapper extends PlaceHistoryMapper {}

我在我的应用程序中所做的是使用脚本生成 Activity 、 View 、位置并基于模板更新 gin 模块和映射器。

关于java - 如何摆脱 PlaceHistoryMapper,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15447391/

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