1 /*
2  * Copyright (C) 2009 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.google.common.collect;
18 
19 import com.google.common.annotations.GwtCompatible;
20 
21 import java.lang.reflect.Array;
22 
23 // TODO(kevinb): guava javadoc path seems set wrong, doesn't find that last
24 // import
25 /**
26  * Version of {@link GwtPlatform} used in hosted-mode.  It includes methods in
27  * {@link Platform} that requires different implementions in web mode and
28  * hosted mode.  It is factored out from {@link Platform} because {@code
29  * GwtScriptOnly} (which is applied to the emul version) supports only public
30  * classes and methods.
31  *
32  * @author Hayward Chan
33  */
34 // TODO(hhchan): Once we start using server-side source in hosted mode, we won't
35 // need this.
36 @GwtCompatible(emulated = true)
37 public final class GwtPlatform {
38 
GwtPlatform()39   private GwtPlatform() {}
40 
41   /** See {@link Platform#newArray(Object[], int)} */
newArray(T[] reference, int length)42   public static <T> T[] newArray(T[] reference, int length) {
43     Class<?> type = reference.getClass().getComponentType();
44 
45     // the cast is safe because
46     // result.getClass() == reference.getClass().getComponentType()
47     @SuppressWarnings("unchecked")
48     T[] result = (T[]) Array.newInstance(type, length);
49     return result;
50   }
51 }
52