user/super/com/google/gwt/emul/java/lang/System.java

/*
 * Copyright 2006 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package java.lang;

import java.io.PrintStream;

/**
 * General-purpose low-level utility methods. GWT only supports a limited subset
 * of these methods due to browser limitations. Only the documented methods are
 * available.
 */
public final class System {

  /**
   * Does nothing in web mode. To get output in web mode, subclass PrintStream
   * and call {@link #setErr(PrintStream)}.
   */
  public static final PrintStream err = new PrintStream(null);

  /**
   * Does nothing in web mode. To get output in web mode, subclass
   * {@link PrintStream} and call {@link #setOut(PrintStream)}.
   */
  public static final PrintStream out = new PrintStream(null);

  public static native long currentTimeMillis() /*-{
    return (new Date()).getTime();
  }-*/;

  /**
   * Has no effect; just here for source compatibility.
   * 
   * @skip
   */
  public static native void gc() /*-{
  }-*/;

  public static native int identityHashCode(Object o) /*-{
    return @com.google.gwt.core.client.Impl::getHashCode(Ljava/lang/Object;)(o);
  }-*/;

  public static native void setErr(PrintStream err) /*-{
    @java.lang.System::err = err;
  }-*/;

  public static native void setOut(PrintStream out) /*-{
    @java.lang.System::out = out;
  }-*/;

}