com.google.gwt.core.client.UnsafeNativeLong Maven / Gradle / Ivy
/*
* Copyright 2008 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 com.google.gwt.core.client;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* This annotation can be placed on a native method to allow it to directly
* access Java long values. Without this annotation present,
* accessing a long in any way from a JSNI method is an error.
* This includes declaring a parameter or return type of long,
* calling a method that takes or returns a long, or accessing a
* long field.
*
*
* The reason for the restriction is that Java long values are not represented
* as numeric values in compiled code, but as opaque Objects. Attempting to
* perform math operations on them would produce undesirable results.
*
*
* Use this annotation with care; the only safe thing to do with
* long values in JSNI code is to pass them back into Java
* unaltered.
*
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.SOURCE)
public @interface UnsafeNativeLong {
}