Package com.google.gwt.core.shared

Class GWT

  • public final class GWT
extends java.lang.Object
    Supports core functionality that in some cases requires direct support from the compiler and runtime systems such as runtime type information and deferred binding.

    • Constructor Summary

      Constructors 
      Constructor Description
      GWT()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <T> T create​(java.lang.Class<?> classLiteral)
      Instantiates a class via deferred binding.
      static <T> T createImpl​(java.lang.Class<?> classLiteral)
      Instantiates a class via deferred binding.
      static void debugger()
      Emits a JavaScript "debugger" statement on the line that called this method.
      static java.lang.String getUniqueThreadId()
      Returns the empty string when running in Production Mode, but returns a unique string for each thread in Development Mode (for example, different windows accessing the dev mode server will each have a unique id, and hitting refresh without restarting dev mode will result in a new unique id for a particular window.
      static java.lang.String getVersion()
      Get a human-readable representation of the GWT version used, or null if this is running on the client.
      static boolean isClient()
      Returns true when running inside the normal GWT environment, either in Development Mode or Production Mode.
      static boolean isProdMode()
      Returns true when running in production mode.
      static boolean isScript()
      Determines whether or not the running program is script or bytecode.
      static void log​(java.lang.String message)
      Logs a message to the development shell logger in Development Mode, or to the JavaScript console in Super Dev Mode.
      static void log​(java.lang.String message, java.lang.Throwable e)
      Logs a message to the development shell logger in Development Mode, or to the JavaScript console in Super Dev Mode.
      static void setBridge​(GWTBridge bridge)
      Called via reflection in Development Mode; do not ever call this method in Production Mode.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • GWT

        public GWT()

    • Method Detail

      • create

        public static <T> T create​(java.lang.Class<?> classLiteral)
        Instantiates a class via deferred binding.

        The argument to create(Class) must be a class literal because the Production Mode compiler must be able to statically determine the requested type at compile-time. This can be tricky because using a Class variable may appear to work correctly in Development Mode.

        Parameters:
        classLiteral - a class literal specifying the base class to be instantiated
        Returns:
        the new instance, which must be cast to the requested class

      • createImpl

        public static <T> T createImpl​(java.lang.Class<?> classLiteral)
        Instantiates a class via deferred binding.
        Parameters:
        classLiteral - a class literal specifying the base class to be instantiated
        Returns:
        the new instance, which must be cast to the requested class

      • getUniqueThreadId

        public static java.lang.String getUniqueThreadId()
        Returns the empty string when running in Production Mode, but returns a unique string for each thread in Development Mode (for example, different windows accessing the dev mode server will each have a unique id, and hitting refresh without restarting dev mode will result in a new unique id for a particular window. TODO(unnurg): Remove this function once Dev Mode rewriting classes are in gwt-dev.

      • getVersion

        public static java.lang.String getVersion()
        Get a human-readable representation of the GWT version used, or null if this is running on the client.
        Returns:
        a human-readable version number, such as "2.5"

      • isClient

        public static boolean isClient()
        Returns true when running inside the normal GWT environment, either in Development Mode or Production Mode. Returns false if this code is running in a plain JVM. This might happen when running shared code on the server, or during the bootstrap sequence of a GWTTestCase test.

      • isProdMode

        public static boolean isProdMode()
        Returns true when running in production mode. Returns false when running either in development mode, or when running in a plain JVM.

      • isScript

        public static boolean isScript()
        Determines whether or not the running program is script or bytecode.

      • log

        public static void log​(java.lang.String message)
        Logs a message to the development shell logger in Development Mode, or to the JavaScript console in Super Dev Mode. Calls are optimized out in Production Mode.

      • log

        public static void log​(java.lang.String message,
                       java.lang.Throwable e)
        Logs a message to the development shell logger in Development Mode, or to the JavaScript console in Super Dev Mode. Calls are optimized out in Production Mode.

      • debugger

        public static void debugger()
        Emits a JavaScript "debugger" statement on the line that called this method. If the user has the browser's debugger open, the debugger will stop when the GWT application executes that line. There is no effect in Dev Mode or in server-side code.

      • setBridge

        public static void setBridge​(GWTBridge bridge)
        Called via reflection in Development Mode; do not ever call this method in Production Mode. May be called in server code to initialize server bridge.