1/*
2 * Copyright 2010, The Android Open Source Project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *  * Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 *  * Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "DeviceMotionClientImpl.h"
28
29#include "WebViewCore.h"
30#include <DeviceMotionController.h>
31#include <Frame.h>
32#include <JNIHelp.h>
33
34namespace android {
35
36using JSC::Bindings::getJNIEnv;
37
38enum javaServiceClassMethods {
39    ServiceMethodStart = 0,
40    ServiceMethodStop,
41    ServiceMethodSuspend,
42    ServiceMethodResume,
43    ServiceMethodCount
44};
45static jmethodID javaServiceClassMethodIDs[ServiceMethodCount];
46
47DeviceMotionClientImpl::DeviceMotionClientImpl(WebViewCore* webViewCore)
48    : m_webViewCore(webViewCore)
49    , m_javaServiceObject(0)
50{
51    ASSERT(m_webViewCore);
52}
53
54DeviceMotionClientImpl::~DeviceMotionClientImpl()
55{
56    releaseJavaInstance();
57}
58
59jobject DeviceMotionClientImpl::getJavaInstance()
60{
61    // Lazily get the Java object. We can't do this until the WebViewCore is all
62    // set up.
63    if (m_javaServiceObject)
64        return m_javaServiceObject;
65
66    JNIEnv* env = getJNIEnv();
67
68    ASSERT(m_webViewCore);
69    jobject object = m_webViewCore->getDeviceMotionService();
70    if (!object)
71        return 0;
72
73    // Get the Java DeviceMotionService class.
74    jclass javaServiceClass = env->GetObjectClass(object);
75    ASSERT(javaServiceClass);
76
77    // Set up the methods we wish to call on the Java DeviceMotionService
78    // class.
79    javaServiceClassMethodIDs[ServiceMethodStart] =
80        env->GetMethodID(javaServiceClass, "start", "()V");
81    javaServiceClassMethodIDs[ServiceMethodStop] =
82        env->GetMethodID(javaServiceClass, "stop", "()V");
83    javaServiceClassMethodIDs[ServiceMethodSuspend] =
84        env->GetMethodID(javaServiceClass, "suspend", "()V");
85    javaServiceClassMethodIDs[ServiceMethodResume] =
86        env->GetMethodID(javaServiceClass, "resume", "()V");
87    env->DeleteLocalRef(javaServiceClass);
88
89    m_javaServiceObject = getJNIEnv()->NewGlobalRef(object);
90    getJNIEnv()->DeleteLocalRef(object);
91
92    ASSERT(m_javaServiceObject);
93    return m_javaServiceObject;
94}
95
96void DeviceMotionClientImpl::releaseJavaInstance()
97{
98    if (m_javaServiceObject)
99        getJNIEnv()->DeleteGlobalRef(m_javaServiceObject);
100}
101
102void DeviceMotionClientImpl::startUpdating()
103{
104    jobject javaInstance = getJavaInstance();
105    if (!javaInstance)
106        return;
107    getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodStart]);
108}
109
110void DeviceMotionClientImpl::stopUpdating()
111{
112    jobject javaInstance = getJavaInstance();
113    if (!javaInstance)
114        return;
115    getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodStop]);
116}
117
118void DeviceMotionClientImpl::onMotionChange(PassRefPtr<DeviceMotionData> motion)
119{
120    m_lastMotion = motion;
121    m_controller->didChangeDeviceMotion(m_lastMotion.get());
122}
123
124void DeviceMotionClientImpl::suspend()
125{
126    jobject javaInstance = getJavaInstance();
127    if (!javaInstance)
128        return;
129    getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodSuspend]);
130}
131
132void DeviceMotionClientImpl::resume()
133{
134    jobject javaInstance = getJavaInstance();
135    if (!javaInstance)
136        return;
137    getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodResume]);
138}
139
140} // namespace android
141