1 /*
2  * Copyright (C) 2010 The Android Open Source Project
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 dalvik.system.profiler;
18 
19 import java.util.Arrays;
20 
21 /**
22  * ThreadSampler implementation that only uses Thread.getStackTrace()
23  * and therefore is portable.
24  */
25 class PortableThreadSampler implements ThreadSampler {
26 
27     private int depth;
28 
setDepth(int depth)29     @Override public void setDepth(int depth) {
30         this.depth = depth;
31     }
32 
getStackTrace(Thread thread)33     @Override public StackTraceElement[] getStackTrace(Thread thread) {
34         StackTraceElement[] stackFrames = thread.getStackTrace();
35         if (stackFrames.length == 0) {
36             return null;
37         }
38         if (stackFrames.length > depth) {
39             stackFrames = Arrays.copyOfRange(stackFrames, 0, depth);
40         }
41         return stackFrames;
42     }
43 }
44