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      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 
     34 namespace android {
     35 
     36 using JSC::Bindings::getJNIEnv;
     37 
     38 enum javaServiceClassMethods {
     39     ServiceMethodStart = 0,
     40     ServiceMethodStop,
     41     ServiceMethodSuspend,
     42     ServiceMethodResume,
     43     ServiceMethodCount
     44 };
     45 static jmethodID javaServiceClassMethodIDs[ServiceMethodCount];
     46 
     47 DeviceMotionClientImpl::DeviceMotionClientImpl(WebViewCore* webViewCore)
     48     : m_webViewCore(webViewCore)
     49     , m_javaServiceObject(0)
     50 {
     51     ASSERT(m_webViewCore);
     52 }
     53 
     54 DeviceMotionClientImpl::~DeviceMotionClientImpl()
     55 {
     56     releaseJavaInstance();
     57 }
     58 
     59 jobject 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 
     96 void DeviceMotionClientImpl::releaseJavaInstance()
     97 {
     98     if (m_javaServiceObject)
     99         getJNIEnv()->DeleteGlobalRef(m_javaServiceObject);
    100 }
    101 
    102 void DeviceMotionClientImpl::startUpdating()
    103 {
    104     jobject javaInstance = getJavaInstance();
    105     if (!javaInstance)
    106         return;
    107     getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodStart]);
    108 }
    109 
    110 void DeviceMotionClientImpl::stopUpdating()
    111 {
    112     jobject javaInstance = getJavaInstance();
    113     if (!javaInstance)
    114         return;
    115     getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodStop]);
    116 }
    117 
    118 void DeviceMotionClientImpl::onMotionChange(PassRefPtr<DeviceMotionData> motion)
    119 {
    120     m_lastMotion = motion;
    121     m_controller->didChangeDeviceMotion(m_lastMotion.get());
    122 }
    123 
    124 void DeviceMotionClientImpl::suspend()
    125 {
    126     jobject javaInstance = getJavaInstance();
    127     if (!javaInstance)
    128         return;
    129     getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodSuspend]);
    130 }
    131 
    132 void DeviceMotionClientImpl::resume()
    133 {
    134     jobject javaInstance = getJavaInstance();
    135     if (!javaInstance)
    136         return;
    137     getJNIEnv()->CallVoidMethod(javaInstance, javaServiceClassMethodIDs[ServiceMethodResume]);
    138 }
    139 
    140 } // namespace android
    141