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 com.android.tools.layoutlib.create;
18
19import static org.junit.Assert.*;
20
21import org.junit.Test;
22import org.objectweb.asm.ClassReader;
23
24import java.io.IOException;
25import java.util.ArrayList;
26
27
28/**
29 * Tests {@link ClassHasNativeVisitor}.
30 */
31public class ClassHasNativeVisitorTest {
32
33    @Test
34    public void testHasNative() throws IOException {
35        MockClassHasNativeVisitor cv = new MockClassHasNativeVisitor();
36        String className =
37                this.getClass().getCanonicalName() + "$" + ClassWithNative.class.getSimpleName();
38        ClassReader cr = new ClassReader(className);
39
40        cr.accept(cv, 0 /* flags */);
41        assertArrayEquals(new String[] { "native_method" }, cv.getMethodsFound());
42        assertTrue(cv.hasNativeMethods());
43    }
44
45    @Test
46    public void testHasNoNative() throws IOException {
47        MockClassHasNativeVisitor cv = new MockClassHasNativeVisitor();
48        String className =
49            this.getClass().getCanonicalName() + "$" + ClassWithoutNative.class.getSimpleName();
50        ClassReader cr = new ClassReader(className);
51
52        cr.accept(cv, 0 /* flags */);
53        assertArrayEquals(new String[0], cv.getMethodsFound());
54        assertFalse(cv.hasNativeMethods());
55    }
56
57    //-------
58
59    /**
60     * Overrides {@link ClassHasNativeVisitor} to collec the name of the native methods found.
61     */
62    private static class MockClassHasNativeVisitor extends ClassHasNativeVisitor {
63        private ArrayList<String> mMethodsFound = new ArrayList<>();
64
65        public String[] getMethodsFound() {
66            return mMethodsFound.toArray(new String[mMethodsFound.size()]);
67        }
68
69        @Override
70        protected void setHasNativeMethods(boolean hasNativeMethods, String methodName) {
71            if (hasNativeMethods) {
72                mMethodsFound.add(methodName);
73            }
74            super.setHasNativeMethods(hasNativeMethods, methodName);
75        }
76    }
77
78    /**
79     * Dummy test class with a native method.
80     */
81    public static class ClassWithNative {
82        public ClassWithNative() {
83        }
84
85        public void callTheNativeMethod() {
86            native_method();
87        }
88
89        private native void native_method();
90    }
91
92    /**
93     * Dummy test class with no native method.
94     */
95    public static class ClassWithoutNative {
96        public ClassWithoutNative() {
97        }
98
99        public void someMethod() {
100        }
101    }
102}
103