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package org.holoeverywhere;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.holoeverywhere.SystemServiceManager.SystemServiceCreator.SystemService;
import android.content.Context;
/**
* Manager of system services
*
* @author prok (prototypegamez@gmail.com)
*/
public final class SystemServiceManager {
public static interface SuperSystemService {
public Object superGetSystemService(String name);
}
public static interface SystemServiceCreator<T> {
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public static @interface SystemService {
public String value();
}
public T createService(Context context);
}
private static final Map<Class<? extends SystemServiceCreator<?>>, SystemServiceCreator<?>> CREATORS_MAP = new HashMap<Class<? extends SystemServiceCreator<?>>, SystemServiceManager.SystemServiceCreator<?>>();
private static final Map<String, Class<? extends SystemServiceCreator<?>>> MAP = new HashMap<String, Class<? extends SystemServiceCreator<?>>>();
private static Object getSuperSystemService(Context context, String name) {
if (context instanceof SuperSystemService) {
return ((SuperSystemService) context).superGetSystemService(name);
} else {
return context.getSystemService(name);
}
}
public static Object getSystemService(Context context, String name) {
if (context == null || context.isRestricted()) {
throw new RuntimeException("Invalid context");
} else if (name == null || name.length() == 0) {
return null;
}
Class<? extends SystemServiceCreator<?>> clazz = MAP.get(name);
if (clazz == null) {
return getSuperSystemService(context, name);
}
SystemServiceCreator<?> creator = CREATORS_MAP.get(clazz);
if (creator == null) {
try {
creator = clazz.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
CREATORS_MAP.put(clazz, creator);
}
if (creator != null) {
Object o = creator.createService(context);
if (o != null) {
return o;
}
}
return getSuperSystemService(context, name);
}
public static void register(Class<? extends SystemServiceCreator<?>> clazz) {
if (!clazz.isAnnotationPresent(SystemService.class)) {
throw new RuntimeException(
"SystemServiceCreator must be implement SystemService");
}
SystemService systemService = clazz.getAnnotation(SystemService.class);
final String name = systemService.value();
if (name == null || name.length() == 0) {
throw new RuntimeException("SystemService has incorrect name");
}
MAP.put(name, clazz);
}
public static synchronized void unregister(
Class<? extends SystemServiceCreator<?>> clazz) {
if (MAP.containsValue(clazz)) {
for (Entry<String, Class<? extends SystemServiceCreator<?>>> e : MAP
.entrySet()) {
if (e.getValue() == clazz) {
MAP.remove(e.getKey());
break;
}
}
}
CREATORS_MAP.remove(clazz);
}
private SystemServiceManager() {
}
}
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