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
17package dalvik.system.profiler;
18
19import java.util.Arrays;
20
21/**
22 * ThreadSampler implementation that only uses Thread.getStackTrace()
23 * and therefore is portable.
24 */
25class PortableThreadSampler implements ThreadSampler {
26
27    private int depth;
28
29    @Override public void setDepth(int depth) {
30        this.depth = depth;
31    }
32
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