Java JavaAWTAccess.get方法代码示例

import sun.misc.JavaAWTAccess; //导入方法依赖的package包/类
/**
 * Returns the default TimeZone in an AppContext if any AppContext
 * has ever used. null is returned if any AppContext hasn't been
 * used or if the AppContext doesn't have the default TimeZone.
 * null is also returned if allowSetDefault is false.
 *
 * Note that javaAWTAccess may be null if sun.awt.AppContext class hasn't
 * been loaded. If so, it implies that AWTSecurityManager is not our
 * SecurityManager and we can use a local static variable.
 * This works around a build time issue.
 */
private static TimeZone getDefaultInAppContext() {
    if (allowSetDefault) {
        // JavaAWTAccess provides access implementation-private methods without using reflection.
        JavaAWTAccess javaAWTAccess = SharedSecrets.getJavaAWTAccess();
        if (System.getSecurityManager() == null || javaAWTAccess == null) {
            return mainAppContextDefault;
        } else if (javaAWTAccess.isDisposed()) {
            return null;
        } else {
            TimeZone tz = (TimeZone) javaAWTAccess.get(TimeZone.class);
            if (tz == null && javaAWTAccess.isMainAppContext()) {
                return mainAppContextDefault;
            } else {
                return tz;
            }
        }
    }
    return null;
}
 

import sun.misc.JavaAWTAccess; //导入方法依赖的package包/类
/**
 * Returns the default TimeZone in an AppContext if any AppContext
 * has ever used. null is returned if any AppContext hasn't been
 * used or if the AppContext doesn't have the default TimeZone.
 * null is also returned if allowSetDefault is false.
 *
 * Note that javaAWTAccess may be null if sun.awt.AppContext class hasn't
 * been loaded. If so, it implies that AWTSecurityManager is not our
 * SecurityManager and we can use a local static variable.
 * This works around a build time issue.
 */
private static TimeZone getDefaultInAppContext() {
    if (allowSetDefault) {
        // JavaAWTAccess provides access implementation-private methods without using reflection.
        JavaAWTAccess javaAWTAccess = SharedSecrets.getJavaAWTAccess();
        if (javaAWTAccess == null) {
            return mainAppContextDefault;
        } else {
            if (!javaAWTAccess.isDisposed()) {
                TimeZone tz = (TimeZone)
                    javaAWTAccess.get(TimeZone.class);
                if (tz == null && javaAWTAccess.isMainAppContext()) {
                    return mainAppContextDefault;
                } else {
                    return tz;
                }
            }
        }
    }
    return null;
}
 

import sun.misc.JavaAWTAccess; //导入方法依赖的package包/类
private LoggerContext getUserContext() {
    LoggerContext context = null;

    SecurityManager sm = System.getSecurityManager();
    JavaAWTAccess javaAwtAccess = SharedSecrets.getJavaAWTAccess();
    if (sm != null && javaAwtAccess != null) {
        synchronized (javaAwtAccess) {
            // AppContext.getAppContext() returns the system AppContext if called
            // from a system thread but Logger.getLogger might be called from
            // an applet code. Instead, find the AppContext of the applet code
            // from the execution stack.
            Object ecx = javaAwtAccess.getExecutionContext();
            if (ecx == null) {
                // fall back to thread group seach of AppContext
                ecx = javaAwtAccess.getContext();
            }
            if (ecx != null) {
                context = (LoggerContext)javaAwtAccess.get(ecx, LoggerContext.class);
                if (context == null) {
                    if (javaAwtAccess.isMainAppContext()) {
                        context = userContext;
                    } else {
                        // Create a new LoggerContext for the applet.
                        // The new logger context has its requiresDefaultLoggers
                        // flag set to true - so that these loggers will be
                        // lazily added when the context is firt accessed.
                        context = new LoggerContext(true);
                    }
                    javaAwtAccess.put(ecx, LoggerContext.class, context);
                }
            }
        }
    }
    return context != null ? context : userContext;
}