com_android_server_InputApplicationHandle.cpp revision 17cc33a35729733aaa0a7706f38b1c45f0b1590a 
1/*
2 * Copyright (C) 2011 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#define LOG_TAG "InputApplicationHandle"
18
19#include "JNIHelp.h"
20#include "jni.h"
21#include <android_runtime/AndroidRuntime.h>
22#include <utils/threads.h>
23
24#include "com_android_server_InputApplicationHandle.h"
25
26namespace android {
27
28static struct {
29    jfieldID ptr;
30} gInputApplicationHandleClassInfo;
31
32static Mutex gHandleMutex;
33
34
35// --- NativeInputApplicationHandle ---
36
37NativeInputApplicationHandle::NativeInputApplicationHandle(jweak objWeak) :
38        mObjWeak(objWeak) {
39}
40
41NativeInputApplicationHandle::~NativeInputApplicationHandle() {
42    JNIEnv* env = AndroidRuntime::getJNIEnv();
43    env->DeleteWeakGlobalRef(mObjWeak);
44}
45
46jobject NativeInputApplicationHandle::getInputApplicationHandleObjLocalRef(JNIEnv* env) {
47    return env->NewLocalRef(mObjWeak);
48}
49
50
51// --- Global functions ---
52
53sp<InputApplicationHandle> android_server_InputApplicationHandle_getHandle(
54        JNIEnv* env, jobject inputApplicationHandleObj) {
55    if (!inputApplicationHandleObj) {
56        return NULL;
57    }
58
59    AutoMutex _l(gHandleMutex);
60
61    int ptr = env->GetIntField(inputApplicationHandleObj, gInputApplicationHandleClassInfo.ptr);
62    NativeInputApplicationHandle* handle;
63    if (ptr) {
64        handle = reinterpret_cast<NativeInputApplicationHandle*>(ptr);
65    } else {
66        jweak objWeak = env->NewWeakGlobalRef(inputApplicationHandleObj);
67        handle = new NativeInputApplicationHandle(objWeak);
68        handle->incStrong(inputApplicationHandleObj);
69        env->SetIntField(inputApplicationHandleObj, gInputApplicationHandleClassInfo.ptr,
70                reinterpret_cast<int>(handle));
71    }
72    return handle;
73}
74
75
76// --- JNI ---
77
78static void android_server_InputApplicationHandle_nativeDispose(JNIEnv* env, jobject obj) {
79    AutoMutex _l(gHandleMutex);
80
81    int ptr = env->GetIntField(obj, gInputApplicationHandleClassInfo.ptr);
82    if (ptr) {
83        env->SetIntField(obj, gInputApplicationHandleClassInfo.ptr, 0);
84
85        NativeInputApplicationHandle* handle = reinterpret_cast<NativeInputApplicationHandle*>(ptr);
86        handle->decStrong(obj);
87    }
88}
89
90
91static JNINativeMethod gInputApplicationHandleMethods[] = {
92    /* name, signature, funcPtr */
93    { "nativeDispose", "()V",
94            (void*) android_server_InputApplicationHandle_nativeDispose },
95};
96
97#define FIND_CLASS(var, className) \
98        var = env->FindClass(className); \
99        LOG_FATAL_IF(! var, "Unable to find class " className);
100
101#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
102        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
103        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
104
105int register_android_server_InputApplicationHandle(JNIEnv* env) {
106    int res = jniRegisterNativeMethods(env, "com/android/server/wm/InputApplicationHandle",
107            gInputApplicationHandleMethods, NELEM(gInputApplicationHandleMethods));
108    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
109
110    jclass clazz;
111    FIND_CLASS(clazz, "com/android/server/wm/InputApplicationHandle");
112
113    GET_FIELD_ID(gInputApplicationHandleClassInfo.ptr, clazz,
114            "ptr", "I");
115
116    return 0;
117}
118
119} /* namespace android */
120