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Android example source code file (JWebCoreJavaBridge.java)

This example Android source code file (JWebCoreJavaBridge.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, boolean, funcptr_message, handler, jwebcorejavabridge, logtag, message, os, override, perfchecker, refresh_plugins, string, stringbuilder, there, timer_message, util, utilities, utils, webview

The JWebCoreJavaBridge.java Android example source code

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.webkit;

import android.os.Handler;
import android.os.Message;
import android.util.Log;

import java.util.Set;

final class JWebCoreJavaBridge extends Handler {
    // Identifier for the timer message.
    private static final int TIMER_MESSAGE = 1;
    // ID for servicing functionptr queue
    private static final int FUNCPTR_MESSAGE = 2;
    // Log system identifier.
    private static final String LOGTAG = "webkit-timers";

    // Native object pointer for interacting in native code.
    private int mNativeBridge;
    // Instant timer is used to implement a timer that needs to fire almost
    // immediately.
    private boolean mHasInstantTimer;

    // Reference count the pause/resume of timers
    private int mPauseTimerRefCount;

    private boolean mTimerPaused;
    private boolean mHasDeferredTimers;

    // keep track of the main WebView attached to the current window so that we
    // can get the proper Context.
    private WebView mCurrentMainWebView;

    /* package */
    static final int REFRESH_PLUGINS = 100;

    /**
     * Construct a new JWebCoreJavaBridge to interface with
     * WebCore timers and cookies.
     */
    public JWebCoreJavaBridge() {
        nativeConstructor();
    }

    @Override
    protected void finalize() {
        nativeFinalize();
    }

    synchronized void setActiveWebView(WebView webview) {
        if (mCurrentMainWebView != null) {
            // it is possible if there is a sub-WebView. Do nothing.
            return;
        }
        mCurrentMainWebView = webview;
    }

    synchronized void removeActiveWebView(WebView webview) {
        if (mCurrentMainWebView != webview) {
            // it is possible if there is a sub-WebView. Do nothing.
            return;
        }
        mCurrentMainWebView = null;
    }

    /**
     * Call native timer callbacks.
     */
    private void fireSharedTimer() { 
        PerfChecker checker = new PerfChecker();
        // clear the flag so that sharedTimerFired() can set a new timer
        mHasInstantTimer = false;
        sharedTimerFired();
        checker.responseAlert("sharedTimer");
    }

    /**
     * handleMessage
     * @param msg The dispatched message.
     *
     * The only accepted message currently is TIMER_MESSAGE
     */
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
            case TIMER_MESSAGE: {
                if (mTimerPaused) {
                    mHasDeferredTimers = true;
                } else {
                    fireSharedTimer();
                }
                break;
            }
            case FUNCPTR_MESSAGE:
                nativeServiceFuncPtrQueue();
                break;
            case REFRESH_PLUGINS:
                nativeUpdatePluginDirectories(PluginManager.getInstance(null)
                        .getPluginDirectories(), ((Boolean) msg.obj)
                        .booleanValue());
                break;
        }
    }
    
    // called from JNI side
    private void signalServiceFuncPtrQueue() {
        Message msg = obtainMessage(FUNCPTR_MESSAGE);
        sendMessage(msg);
    }
    
    private native void nativeServiceFuncPtrQueue();

    /**
     * Pause all timers.
     */
    public void pause() {
        if (--mPauseTimerRefCount == 0) {
            mTimerPaused = true;
            mHasDeferredTimers = false;
        }
    }

    /**
     * Resume all timers.
     */
    public void resume() {
        if (++mPauseTimerRefCount == 1) {
           mTimerPaused = false;
           if (mHasDeferredTimers) {
               mHasDeferredTimers = false;
               fireSharedTimer();
           }
        }
    }

    /**
     * Set WebCore cache size.
     * @param bytes The cache size in bytes.
     */
    public native void setCacheSize(int bytes);

    /**
     * Store a cookie string associated with a url.
     * @param url The url to be used as a key for the cookie.
     * @param value The cookie string to be stored.
     */
    private void setCookies(String url, String value) {
        if (value.contains("\r") || value.contains("\n")) {
            // for security reason, filter out '\r' and '\n' from the cookie
            int size = value.length();
            StringBuilder buffer = new StringBuilder(size);
            int i = 0;
            while (i != -1 && i < size) {
                int ir = value.indexOf('\r', i);
                int in = value.indexOf('\n', i);
                int newi = (ir == -1) ? in : (in == -1 ? ir : (ir < in ? ir
                        : in));
                if (newi > i) {
                    buffer.append(value.subSequence(i, newi));
                } else if (newi == -1) {
                    buffer.append(value.subSequence(i, size));
                    break;
                }
                i = newi + 1;
            }
            value = buffer.toString();
        }
        CookieManager.getInstance().setCookie(url, value);
    }

    /**
     * Retrieve the cookie string for the given url.
     * @param url The resource's url.
     * @return A String representing the cookies for the given resource url.
     */
    private String cookies(String url) {
        return CookieManager.getInstance().getCookie(url);
    }

    /**
     * Returns whether cookies are enabled or not.
     */
    private boolean cookiesEnabled() {
        return CookieManager.getInstance().acceptCookie();
    }

    /**
     * Returns an array of plugin directoies
     */
    private String[] getPluginDirectories() {
        return PluginManager.getInstance(null).getPluginDirectories();
    }

    /**
     * Returns the path of the plugin data directory
     */
    private String getPluginSharedDataDirectory() {
        return PluginManager.getInstance(null).getPluginSharedDataDirectory();
    }

    /**
     * setSharedTimer
     * @param timemillis The relative time when the timer should fire
     */
    private void setSharedTimer(long timemillis) {
        if (DebugFlags.J_WEB_CORE_JAVA_BRIDGE) Log.v(LOGTAG, "setSharedTimer " + timemillis);

        if (timemillis <= 0) {
            // we don't accumulate the sharedTimer unless it is a delayed
            // request. This way we won't flood the message queue with
            // WebKit messages. This should improve the browser's
            // responsiveness to key events.
            if (mHasInstantTimer) {
                return;
            } else {
                mHasInstantTimer = true;
                Message msg = obtainMessage(TIMER_MESSAGE);
                sendMessageDelayed(msg, timemillis);
            }
        } else {
            Message msg = obtainMessage(TIMER_MESSAGE);
            sendMessageDelayed(msg, timemillis);
        }
    }

    /**
     * Stop the shared timer.
     */
    private void stopSharedTimer() {
        if (DebugFlags.J_WEB_CORE_JAVA_BRIDGE) {
            Log.v(LOGTAG, "stopSharedTimer removing all timers");
        }
        removeMessages(TIMER_MESSAGE);
        mHasInstantTimer = false;
        mHasDeferredTimers = false;
    }

    private String[] getKeyStrengthList() {
        return CertTool.getKeyStrengthList();
    }

    synchronized private String getSignedPublicKey(int index, String challenge,
            String url) {
        if (mCurrentMainWebView != null) {
            // generateKeyPair expects organizations which we don't have. Ignore
            // url.
            return CertTool.getSignedPublicKey(
                    mCurrentMainWebView.getContext(), index, challenge);
        } else {
            Log.e(LOGTAG, "There is no active WebView for getSignedPublicKey");
            return "";
        }
    }

    private native void nativeConstructor();
    private native void nativeFinalize();
    private native void sharedTimerFired();
    private native void nativeUpdatePluginDirectories(String[] directories,
            boolean reload);
    public native void setNetworkOnLine(boolean online);
    public native void setNetworkType(String type, String subtype);
    public native void addPackageNames(Set<String> packageNames);
    public native void addPackageName(String packageName);
    public native void removePackageName(String packageName);
}

Other Android examples (source code examples)

Here is a short list of links related to this Android JWebCoreJavaBridge.java source code file:

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