com_android_server_input_InputApplicationHandle.cpp revision 4532e6158474a263d9d26c2b42240bcf7ce9b172 
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_input_InputApplicationHandle.h"
25
26namespace android {
27
28static struct {
29    jfieldID ptr;
30    jfieldID name;
31    jfieldID dispatchingTimeoutNanos;
32} gInputApplicationHandleClassInfo;
33
34static Mutex gHandleMutex;
35
36
37// --- NativeInputApplicationHandle ---
38
39NativeInputApplicationHandle::NativeInputApplicationHandle(jweak objWeak) :
40        mObjWeak(objWeak) {
41}
42
43NativeInputApplicationHandle::~NativeInputApplicationHandle() {
44    JNIEnv* env = AndroidRuntime::getJNIEnv();
45    env->DeleteWeakGlobalRef(mObjWeak);
46}
47
48jobject NativeInputApplicationHandle::getInputApplicationHandleObjLocalRef(JNIEnv* env) {
49    return env->NewLocalRef(mObjWeak);
50}
51
52bool NativeInputApplicationHandle::updateInfo() {
53    JNIEnv* env = AndroidRuntime::getJNIEnv();
54    jobject obj = env->NewLocalRef(mObjWeak);
55    if (!obj) {
56        releaseInfo();
57        return false;
58    }
59
60    if (!mInfo) {
61        mInfo = new InputApplicationInfo();
62    }
63
64    jstring nameObj = jstring(env->GetObjectField(obj,
65            gInputApplicationHandleClassInfo.name));
66    if (nameObj) {
67        const char* nameStr = env->GetStringUTFChars(nameObj, NULL);
68        mInfo->name.setTo(nameStr);
69        env->ReleaseStringUTFChars(nameObj, nameStr);
70        env->DeleteLocalRef(nameObj);
71    } else {
72        mInfo->name.setTo("<null>");
73    }
74
75    mInfo->dispatchingTimeout = env->GetLongField(obj,
76            gInputApplicationHandleClassInfo.dispatchingTimeoutNanos);
77
78    env->DeleteLocalRef(obj);
79    return true;
80}
81
82
83// --- Global functions ---
84
85sp<InputApplicationHandle> android_server_InputApplicationHandle_getHandle(
86        JNIEnv* env, jobject inputApplicationHandleObj) {
87    if (!inputApplicationHandleObj) {
88        return NULL;
89    }
90
91    AutoMutex _l(gHandleMutex);
92
93    int ptr = env->GetIntField(inputApplicationHandleObj, gInputApplicationHandleClassInfo.ptr);
94    NativeInputApplicationHandle* handle;
95    if (ptr) {
96        handle = reinterpret_cast<NativeInputApplicationHandle*>(ptr);
97    } else {
98        jweak objWeak = env->NewWeakGlobalRef(inputApplicationHandleObj);
99        handle = new NativeInputApplicationHandle(objWeak);
100        handle->incStrong(inputApplicationHandleObj);
101        env->SetIntField(inputApplicationHandleObj, gInputApplicationHandleClassInfo.ptr,
102                reinterpret_cast<int>(handle));
103    }
104    return handle;
105}
106
107
108// --- JNI ---
109
110static void android_server_InputApplicationHandle_nativeDispose(JNIEnv* env, jobject obj) {
111    AutoMutex _l(gHandleMutex);
112
113    int ptr = env->GetIntField(obj, gInputApplicationHandleClassInfo.ptr);
114    if (ptr) {
115        env->SetIntField(obj, gInputApplicationHandleClassInfo.ptr, 0);
116
117        NativeInputApplicationHandle* handle = reinterpret_cast<NativeInputApplicationHandle*>(ptr);
118        handle->decStrong(obj);
119    }
120}
121
122
123static JNINativeMethod gInputApplicationHandleMethods[] = {
124    /* name, signature, funcPtr */
125    { "nativeDispose", "()V",
126            (void*) android_server_InputApplicationHandle_nativeDispose },
127};
128
129#define FIND_CLASS(var, className) \
130        var = env->FindClass(className); \
131        LOG_FATAL_IF(! var, "Unable to find class " className);
132
133#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
134        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
135        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
136
137int register_android_server_InputApplicationHandle(JNIEnv* env) {
138    int res = jniRegisterNativeMethods(env, "com/android/server/input/InputApplicationHandle",
139            gInputApplicationHandleMethods, NELEM(gInputApplicationHandleMethods));
140    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
141
142    jclass clazz;
143    FIND_CLASS(clazz, "com/android/server/input/InputApplicationHandle");
144
145    GET_FIELD_ID(gInputApplicationHandleClassInfo.ptr, clazz,
146            "ptr", "I");
147
148    GET_FIELD_ID(gInputApplicationHandleClassInfo.name, clazz,
149            "name", "Ljava/lang/String;");
150
151    GET_FIELD_ID(gInputApplicationHandleClassInfo.dispatchingTimeoutNanos,
152            clazz,
153            "dispatchingTimeoutNanos", "J");
154
155    return 0;
156}
157
158} /* namespace android */
159