GtkBridge.java

/*
* Copyright (C) 2012 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 com.motorola.studio.android.nativeos.linux.gtk;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Arrays;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.Path;
import org.eclipse.swt.graphics.Point;
import org.osgi.framework.Bundle;

import com.motorola.studio.android.AndroidPlugin;
import com.motorola.studio.android.common.log.StudioLogger;

public class GtkBridge
{
    private static final String EXEC = getExecCommad();

    private static final String DISPLAY = getDisplayNum();

    public static String getDisplayNum()
    {
        String display = System.getenv("DISPLAY");
        return display;
    }

    public static String getExecCommad()
    {
        String absoluteFile = "";
        try
        {
            Bundle bundle = AndroidPlugin.getDefault().getBundle();
            URL locationUrl = FileLocator.find(bundle, new Path("gtk_bridge_app"), null);
            URL fileUrl = FileLocator.toFileURL(locationUrl);
            File file = new File(fileUrl.getFile());
            absoluteFile = file.getAbsolutePath();
            StudioLogger.info(GtkBridge.class, "Using gtk bridge app at: " + absoluteFile);
            checkExecutionPermission(absoluteFile);
        }
        catch (Exception e)
        {
            StudioLogger.error(GtkBridge.class, "Failed to retrieve gtk bridge app", e);
        }
        return absoluteFile;
    }

    private static void checkExecutionPermission(String executable) throws IOException
    {
        String[] command = new String[]
        {
                "chmod", "+x", executable
        };
        Runtime.getRuntime().exec(command);
    }

    public static synchronized String exec(String[] command)
    {
        String lastline = "";
        Process p = null;
        BufferedReader reader = null;
        try
        {
            p = Runtime.getRuntime().exec(command);
            reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String returnedValue = "";
            do
            {
                returnedValue = reader.readLine();
                if (returnedValue != null)
                {
                    lastline = returnedValue;
                }
            }
            while (returnedValue != null);
            int exitCode = p.waitFor();
            if (exitCode != 0)
            {
                StudioLogger.debug(GtkBridge.class, "Command " + Arrays.toString(command)
                        + " finished with error code:" + exitCode);
            }
        }
        catch (Exception e)
        {
            StudioLogger.error(GtkBridge.class,
                    "Failed to execute command :" + Arrays.toString(command), e);
        }
        finally
        {
            if (p != null)
            {
                try
                {
                    p.getInputStream().close();
                }
                catch (IOException e)
                {
                    //Do Nothing.
                }
                try
                {
                    p.getOutputStream().close();
                }
                catch (IOException e)
                {
                    //Do Nothing.
                }
                try
                {
                    p.getErrorStream().close();
                }
                catch (IOException e)
                {
                    //Do Nothing.
                }
            }
            if (reader != null)
            {
                try
                {
                    reader.close();
                }
                catch (IOException e)
                {
                    //Do Nothing.
                }
            }
        }

        return lastline;
    }

    private static long exec_toLong(String[] command)
    {
        long response = 0;
        try
        {
            String returnedValue = exec(command);
            if (!"".equals(command))
            {
                response = Long.parseLong(returnedValue);
            }
        }
        catch (Exception e)
        {
            StudioLogger.error(GtkBridge.class, "Failed to execute command", e);
        }
        return response;
    }

    public static long getWindowHandle(String windowName)
    {
        StudioLogger.debug(GtkBridge.class, "getWindowHandle " + windowName);

        String[] command =
        {
                EXEC, "getWindowHandler", DISPLAY, windowName
        };
        long handle = exec_toLong(command);
        StudioLogger.debug(GtkBridge.class, "getWindowHandle handle=" + handle);
        return handle;
    }

    public static long embedNativeWindow(long parentHandle, long windowHandle)
    {
        StudioLogger.debug(GtkBridge.class, "embedNativeWindow parent=" + parentHandle + " window="
                + windowHandle);
        String[] arguments =
                {
                        EXEC, "embedWindow", DISPLAY, Long.toString(parentHandle),
                        Long.toString(windowHandle)
                };
        long handle = exec_toLong(arguments);
        return handle;
    }

    public static void unembedNativeWindow(long parentHandle, long formerParentHandle)
    {
        StudioLogger.debug(GtkBridge.class, "unembedNativeWindow " + parentHandle);
        String[] arguments =
                {
                        EXEC, "unembedWindow", DISPLAY, Long.toString(parentHandle),
                        Long.toString(formerParentHandle)
                };
        exec(arguments);
    }

    public static Point getWindowSize(long handle)
    {
        String[] arguments =
        {
                EXEC, "getWindowSize", DISPLAY, Long.toString(handle)
        };
        String size = exec(arguments);
        Point point;
        try
        {
            String[] pointStr = size.split(",");
            int x = Integer.parseInt(pointStr[0]);
            int y = Integer.parseInt(pointStr[1]);
            point = new Point(x, y);
        }
        catch (Exception e)
        {
            point = new Point(0, 0);
        }
        return point;
    }

    public static void pressKey(long windowHandle, int key)
    {
        String[] arguments =
        {
                EXEC, "pressKey", DISPLAY, Long.toString(windowHandle), Integer.toString(key)
        };
        exec(arguments);
    }

    public static void releaseKey(long windowHandle, int key)
    {
        String[] arguments =
        {
                EXEC, "releaseKey", DISPLAY, Long.toString(windowHandle), Integer.toString(key)
        };
        exec(arguments);
    }

    public static void showWindow(long windowHandle)
    {
        StudioLogger.debug(GtkBridge.class, "showWindow " + windowHandle);
        String[] arguments =
        {
                EXEC, "showWindow", DISPLAY, Long.toString(windowHandle)
        };
        exec(arguments);
    }

    public static void hideWindow(long windowHandle)
    {
        StudioLogger.debug(GtkBridge.class, "hideWindow " + windowHandle);
        String[] arguments =
        {
                EXEC, "hideWindow", DISPLAY, Long.toString(windowHandle)
        };
        exec(arguments);
    }

    public static void restoreWindow(long windowHandle)
    {
        StudioLogger.debug(GtkBridge.class, "restoreWindow " + windowHandle);
        String[] arguments =
        {
                EXEC, "restoreWindow", DISPLAY, Long.toString(windowHandle)
        };
        exec(arguments);
    }

}