/*
 * Copyright (C) 2007 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.android.ide.eclipse.ddms;

import com.android.annotations.NonNull;
import com.android.ddmlib.AndroidDebugBridge;
import com.android.ddmlib.AndroidDebugBridge.IDeviceChangeListener;
import com.android.ddmlib.Client;
import com.android.ddmlib.DdmPreferences;
import com.android.ddmlib.IDevice;
import com.android.ddmlib.Log;
import com.android.ddmlib.Log.ILogOutput;
import com.android.ddmlib.Log.LogLevel;
import com.android.ddmuilib.DdmUiPreferences;
import com.android.ddmuilib.DevicePanel.IUiSelectionListener;
import com.android.ddmuilib.StackTracePanel;
import com.android.ddmuilib.console.DdmConsole;
import com.android.ddmuilib.console.IDdmConsole;
import com.android.ide.eclipse.ddms.i18n.Messages;
import com.android.ide.eclipse.ddms.preferences.PreferenceInitializer;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.console.ConsolePlugin;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.MessageConsole;
import org.eclipse.ui.console.MessageConsoleStream;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

import java.io.File;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.List;

/**
 * The activator class controls the plug-in life cycle
 */
public final class DdmsPlugin extends AbstractUIPlugin implements IDeviceChangeListener,
        IUiSelectionListener, com.android.ddmuilib.StackTracePanel.ISourceRevealer {


    // The plug-in ID
    public static final String PLUGIN_ID = "com.android.ide.eclipse.ddms"; //$NON-NLS-1$

    /** The singleton instance */
    private static DdmsPlugin sPlugin;

    /** Location of the adb command line executable */
    private static String sAdbLocation;
    private static String sToolsFolder;
    private static String sHprofConverter;

    private boolean mHasDebuggerConnectors;
    /** debugger connectors for already running apps.
     * Initialized from an extension point.
     */
    private IDebuggerConnector[] mDebuggerConnectors;
    private ITraceviewLauncher[] mTraceviewLaunchers;
    private List<IClientAction> mClientSpecificActions = null;

    /** Console for DDMS log message */
    private MessageConsole mDdmsConsole;

    private IDevice mCurrentDevice;
    private Client mCurrentClient;
    private boolean mListeningToUiSelection = false;

    private final ArrayList<ISelectionListener> mListeners = new ArrayList<ISelectionListener>();

    private Color mRed;


    /**
     * Classes which implement this interface provide methods that deals
     * with {@link IDevice} and {@link Client} selectionchanges.
     */
    public interface ISelectionListener {

        /**
         * Sent when a new {@link Client} is selected.
         * @param selectedClient The selected client. If null, no clients are selected.
         */
        public void selectionChanged(Client selectedClient);

        /**
         * Sent when a new {@link IDevice} is selected.
         * @param selectedDevice the selected device. If null, no devices are selected.
         */
        public void selectionChanged(IDevice selectedDevice);
    }

    /**
     * The constructor
     */
    public DdmsPlugin() {
        sPlugin = this;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
     */
    @Override
    public void start(BundleContext context) throws Exception {
        super.start(context);

        final Display display = getDisplay();

        // get the eclipse store
        final IPreferenceStore eclipseStore = getPreferenceStore();

        AndroidDebugBridge.addDeviceChangeListener(this);

        DdmUiPreferences.setStore(eclipseStore);

        //DdmUiPreferences.displayCharts();

        // set the consoles.
        mDdmsConsole = new MessageConsole("DDMS", null); //$NON-NLS-1$
        ConsolePlugin.getDefault().getConsoleManager().addConsoles(
                new IConsole[] {
                    mDdmsConsole
                });

        final MessageConsoleStream consoleStream = mDdmsConsole.newMessageStream();
        final MessageConsoleStream errorConsoleStream = mDdmsConsole.newMessageStream();
        mRed = new Color(display, 0xFF, 0x00, 0x00);

        // because this can be run, in some cases, by a non UI thread, and because
        // changing the console properties update the UI, we need to make this change
        // in the UI thread.
        display.asyncExec(new Runnable() {
            @Override
            public void run() {
                errorConsoleStream.setColor(mRed);
            }
        });

        // set up the ddms log to use the ddms console.
        Log.setLogOutput(new ILogOutput() {
            @Override
            public void printLog(LogLevel logLevel, String tag, String message) {
                if (logLevel.getPriority() >= LogLevel.ERROR.getPriority()) {
                    printToStream(errorConsoleStream, tag, message);
                    showConsoleView(mDdmsConsole);
                } else {
                    printToStream(consoleStream, tag, message);
                }
            }

            @Override
            public void printAndPromptLog(final LogLevel logLevel, final String tag,
                    final String message) {
                printLog(logLevel, tag, message);
                // dialog box only run in UI thread..
                display.asyncExec(new Runnable() {
                    @Override
                    public void run() {
                        Shell shell = display.getActiveShell();
                        if (logLevel == LogLevel.ERROR) {
                            MessageDialog.openError(shell, tag, message);
                        } else {
                            MessageDialog.openWarning(shell, tag, message);
                        }
                    }
                });
            }

        });

        // set up the ddms console to use this objects
        DdmConsole.setConsole(new IDdmConsole() {
            @Override
            public void printErrorToConsole(String message) {
                printToStream(errorConsoleStream, null, message);
                showConsoleView(mDdmsConsole);
            }
            @Override
            public void printErrorToConsole(String[] messages) {
                for (String m : messages) {
                    printToStream(errorConsoleStream, null, m);
                }
                showConsoleView(mDdmsConsole);
            }
            @Override
            public void printToConsole(String message) {
                printToStream(consoleStream, null, message);
            }
            @Override
            public void printToConsole(String[] messages) {
                for (String m : messages) {
                    printToStream(consoleStream, null, m);
                }
            }
        });

        // set the listener for the preference change
        eclipseStore.addPropertyChangeListener(new IPropertyChangeListener() {
            @Override
            public void propertyChange(PropertyChangeEvent event) {
                // get the name of the property that changed.
                String property = event.getProperty();

                if (PreferenceInitializer.ATTR_DEBUG_PORT_BASE.equals(property)) {
                    DdmPreferences.setDebugPortBase(
                            eclipseStore.getInt(PreferenceInitializer.ATTR_DEBUG_PORT_BASE));
                } else if (PreferenceInitializer.ATTR_SELECTED_DEBUG_PORT.equals(property)) {
                    DdmPreferences.setSelectedDebugPort(
                            eclipseStore.getInt(PreferenceInitializer.ATTR_SELECTED_DEBUG_PORT));
                } else if (PreferenceInitializer.ATTR_THREAD_INTERVAL.equals(property)) {
                    DdmUiPreferences.setThreadRefreshInterval(
                            eclipseStore.getInt(PreferenceInitializer.ATTR_THREAD_INTERVAL));
                } else if (PreferenceInitializer.ATTR_LOG_LEVEL.equals(property)) {
                    DdmPreferences.setLogLevel(
                            eclipseStore.getString(PreferenceInitializer.ATTR_LOG_LEVEL));
                } else if (PreferenceInitializer.ATTR_TIME_OUT.equals(property)) {
                    DdmPreferences.setTimeOut(
                            eclipseStore.getInt(PreferenceInitializer.ATTR_TIME_OUT));
                } else if (PreferenceInitializer.ATTR_USE_ADBHOST.equals(property)) {
                    DdmPreferences.setUseAdbHost(
                            eclipseStore.getBoolean(PreferenceInitializer.ATTR_USE_ADBHOST));
                } else if (PreferenceInitializer.ATTR_ADBHOST_VALUE.equals(property)) {
                    DdmPreferences.setAdbHostValue(
                            eclipseStore.getString(PreferenceInitializer.ATTR_ADBHOST_VALUE));
                }
            }
        });

        // do some last initializations

        // set the preferences.
        PreferenceInitializer.setupPreferences();

        // this class is set as the main source revealer and will look at all the implementations
        // of the extension point. see #reveal(String, String, int)
        StackTracePanel.setSourceRevealer(this);

        /*
         * Load the extension point implementations.
         * The first step is to load the IConfigurationElement representing the implementations.
         * The 2nd step is to use these objects to instantiate the implementation classes.
         *
         * Because the 2nd step will trigger loading the plug-ins providing the implementations,
         * and those plug-ins could access DDMS classes (like ADT), this 2nd step should be done
         * in a Job to ensure that DDMS is loaded, so that the other plug-ins can load.
         *
         * Both steps could be done in the 2nd step but some of DDMS UI rely on knowing if there
         * is an implementation or not (DeviceView), so we do the first steps in start() and, in
         * some case, record it.
         *
         */

        // get the IConfigurationElement for the debuggerConnector right away.
        final IConfigurationElement[] dcce = findConfigElements(
                "com.android.ide.eclipse.ddms.debuggerConnector"); //$NON-NLS-1$
        mHasDebuggerConnectors = dcce.length > 0;

        // get the other configElements and instantiante them in a Job.
        new Job(Messages.DdmsPlugin_DDMS_Post_Create_Init) {
            @Override
            protected IStatus run(IProgressMonitor monitor) {
                try {
                    // init the lib
                    AndroidDebugBridge.init(true /* debugger support */);

                    // get the available adb locators
                    IConfigurationElement[] elements = findConfigElements(
                            "com.android.ide.eclipse.ddms.toolsLocator"); //$NON-NLS-1$

                    IToolsLocator[] locators = instantiateToolsLocators(elements);

                    for (IToolsLocator locator : locators) {
                        try {
                            String adbLocation = locator.getAdbLocation();
                            String traceviewLocation = locator.getTraceViewLocation();
                            String hprofConvLocation = locator.getHprofConvLocation();
                            if (adbLocation != null && traceviewLocation != null &&
                                    hprofConvLocation != null) {
                                // checks if the location is valid.
                                if (setToolsLocation(adbLocation, hprofConvLocation,
                                        traceviewLocation)) {

                                    AndroidDebugBridge.createBridge(sAdbLocation,
                                            true /* forceNewBridge */);

                                    // no need to look at the other locators.
                                    break;
                                }
                            }
                        } catch (Throwable t) {
                            // ignore, we'll just not use this implementation.
                        }
                    }

                    // get the available debugger connectors
                    mDebuggerConnectors = instantiateDebuggerConnectors(dcce);

                    // get the available Traceview Launchers.
                    elements = findConfigElements("com.android.ide.eclipse.ddms.traceviewLauncher"); //$NON-NLS-1$
                    mTraceviewLaunchers = instantiateTraceviewLauncher(elements);

                    return Status.OK_STATUS;
                } catch (CoreException e) {
                    return e.getStatus();
                }
            }
        }.schedule();
    }

    private void showConsoleView(MessageConsole console) {
        ConsolePlugin.getDefault().getConsoleManager().showConsoleView(console);
    }


    /** Obtain a list of configuration elements that extend the given extension point. */
    IConfigurationElement[] findConfigElements(String extensionPointId) {
        // get the adb location from an implementation of the ADB Locator extension point.
        IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();
        IExtensionPoint extensionPoint = extensionRegistry.getExtensionPoint(extensionPointId);
        if (extensionPoint != null) {
            return extensionPoint.getConfigurationElements();
        }

        // shouldn't happen or it means the plug-in is broken.
        return new IConfigurationElement[0];
    }

    /**
     * Finds if any other plug-in is extending the exposed Extension Point called adbLocator.
     *
     * @return an array of all locators found, or an empty array if none were found.
     */
    private IToolsLocator[] instantiateToolsLocators(IConfigurationElement[] configElements)
            throws CoreException {
        ArrayList<IToolsLocator> list = new ArrayList<IToolsLocator>();

        if (configElements.length > 0) {
            // only use the first one, ignore the others.
            IConfigurationElement configElement = configElements[0];

            // instantiate the class
            Object obj = configElement.createExecutableExtension("class"); //$NON-NLS-1$
            if (obj instanceof IToolsLocator) {
                list.add((IToolsLocator) obj);
            }
        }

        return list.toArray(new IToolsLocator[list.size()]);
    }

    /**
     * Finds if any other plug-in is extending the exposed Extension Point called debuggerConnector.
     *
     * @return an array of all locators found, or an empty array if none were found.
     */
    private IDebuggerConnector[] instantiateDebuggerConnectors(
            IConfigurationElement[] configElements) throws CoreException {
        ArrayList<IDebuggerConnector> list = new ArrayList<IDebuggerConnector>();

        if (configElements.length > 0) {
            // only use the first one, ignore the others.
            IConfigurationElement configElement = configElements[0];

            // instantiate the class
            Object obj = configElement.createExecutableExtension("class"); //$NON-NLS-1$
            if (obj instanceof IDebuggerConnector) {
                list.add((IDebuggerConnector) obj);
            }
        }

        return list.toArray(new IDebuggerConnector[list.size()]);
    }

    /**
     * Finds if any other plug-in is extending the exposed Extension Point called traceviewLauncher.
     *
     * @return an array of all locators found, or an empty array if none were found.
     */
    private ITraceviewLauncher[] instantiateTraceviewLauncher(
            IConfigurationElement[] configElements)
            throws CoreException {
        ArrayList<ITraceviewLauncher> list = new ArrayList<ITraceviewLauncher>();

        if (configElements.length > 0) {
            // only use the first one, ignore the others.
            IConfigurationElement configElement = configElements[0];

            // instantiate the class
            Object obj = configElement.createExecutableExtension("class"); //$NON-NLS-1$
            if (obj instanceof ITraceviewLauncher) {
                list.add((ITraceviewLauncher) obj);
            }
        }

        return list.toArray(new ITraceviewLauncher[list.size()]);
    }

    /**
     * Returns the classes that implement {@link IClientAction} in each of the extensions that
     * extend clientAction extension point.
     * @throws CoreException
     */
    private List<IClientAction> instantiateClientSpecificActions(IConfigurationElement[] elements)
            throws CoreException {
        if (elements == null || elements.length == 0) {
            return Collections.emptyList();
        }

        List<IClientAction> extensions = new ArrayList<IClientAction>(1);

        for (IConfigurationElement e : elements) {
            Object o = e.createExecutableExtension("class"); //$NON-NLS-1$
            if (o instanceof IClientAction) {
                extensions.add((IClientAction) o);
            }
        }

        return extensions;
    }

    public static Display getDisplay() {
        IWorkbench bench = sPlugin.getWorkbench();
        if (bench != null) {
            return bench.getDisplay();
        }
        return null;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
     */
    @Override
    public void stop(BundleContext context) throws Exception {
        AndroidDebugBridge.removeDeviceChangeListener(this);

        AndroidDebugBridge.terminate();

        mRed.dispose();

        sPlugin = null;
        super.stop(context);
    }

    /**
     * Returns the shared instance
     *
     * @return the shared instance
     */
    public static DdmsPlugin getDefault() {
        return sPlugin;
    }

    public static String getAdb() {
        return sAdbLocation;
    }

    public static File getPlatformToolsFolder() {
        return new File(sAdbLocation).getParentFile();
    }

    public static String getToolsFolder() {
        return sToolsFolder;
    }

    public static String getHprofConverter() {
        return sHprofConverter;
    }

    /**
     * Stores the adb location. This returns true if the location is an existing file.
     */
    private static boolean setToolsLocation(String adbLocation, String hprofConvLocation,
            String traceViewLocation) {

        File adb = new File(adbLocation);
        File hprofConverter = new File(hprofConvLocation);
        File traceview = new File(traceViewLocation);

        String missing = "";
        if (adb.isFile() == false) {
            missing += adb.getAbsolutePath() + " ";
        }
        if (hprofConverter.isFile() == false) {
            missing += hprofConverter.getAbsolutePath() + " ";
        }
        if (traceview.isFile() == false) {
            missing += traceview.getAbsolutePath() + " ";
        }

        if (missing.length() > 0) {
            String msg = String.format("DDMS files not found: %1$s", missing);
            Log.e("DDMS", msg);
            Status status = new Status(IStatus.ERROR, PLUGIN_ID, msg, null /*exception*/);
            getDefault().getLog().log(status);
            return false;
        }

        sAdbLocation = adbLocation;
        sHprofConverter = hprofConverter.getAbsolutePath();
        DdmUiPreferences.setTraceviewLocation(traceview.getAbsolutePath());

        sToolsFolder = traceview.getParent();

        return true;
    }

    /**
     * Set the location of the adb executable and optionally starts adb
     * @param adb location of adb
     * @param startAdb flag to start adb
     */
    public static void setToolsLocation(String adbLocation, boolean startAdb,
            String hprofConvLocation, String traceViewLocation) {

        if (setToolsLocation(adbLocation, hprofConvLocation, traceViewLocation)) {
            // starts the server in a thread in case this is blocking.
            if (startAdb) {
                new Thread() {
                    @Override
                    public void run() {
                        // create and start the bridge
                        try {
                            AndroidDebugBridge.createBridge(sAdbLocation,
                                    false /* forceNewBridge */);
                        } catch (Throwable t) {
                            Status status = new Status(IStatus.ERROR, PLUGIN_ID,
                                    "Failed to create AndroidDebugBridge", t);
                            getDefault().getLog().log(status);
                        }
                    }
                }.start();
            }
        }
    }

    /**
     * Returns whether there are implementations of the debuggerConnectors extension point.
     * <p/>
     * This is guaranteed to return the correct value as soon as the plug-in is loaded.
     */
    public boolean hasDebuggerConnectors() {
        return mHasDebuggerConnectors;
    }

    /**
     * Returns the implementations of {@link IDebuggerConnector}.
     * <p/>
     * There may be a small amount of time right after the plug-in load where this can return
     * null even if there are implementation.
     * <p/>
     * Since the use of the implementation likely require user input, the UI can use
     * {@link #hasDebuggerConnectors()} to know if there are implementations before they are loaded.
     */
    public IDebuggerConnector[] getDebuggerConnectors() {
        return mDebuggerConnectors;
    }

    public synchronized void addSelectionListener(ISelectionListener listener) {
        mListeners.add(listener);

        // notify the new listener of the current selection
       listener.selectionChanged(mCurrentDevice);
       listener.selectionChanged(mCurrentClient);
    }

    public synchronized void removeSelectionListener(ISelectionListener listener) {
        mListeners.remove(listener);
    }

    public synchronized void setListeningState(boolean state) {
        mListeningToUiSelection = state;
    }

    /**
     * Sent when the a device is connected to the {@link AndroidDebugBridge}.
     * <p/>
     * This is sent from a non UI thread.
     * @param device the new device.
     *
     * @see IDeviceChangeListener#deviceConnected(IDevice)
     */
    @Override
    public void deviceConnected(IDevice device) {
        // if we are listening to selection coming from the ui, then we do nothing, as
        // any change in the devices/clients, will be handled by the UI, and we'll receive
        // selection notification through our implementation of IUiSelectionListener.
        if (mListeningToUiSelection == false) {
            if (mCurrentDevice == null) {
                handleDefaultSelection(device);
            }
        }
    }

    /**
     * Sent when the a device is disconnected to the {@link AndroidDebugBridge}.
     * <p/>
     * This is sent from a non UI thread.
     * @param device the new device.
     *
     * @see IDeviceChangeListener#deviceDisconnected(IDevice)
     */
    @Override
    public void deviceDisconnected(IDevice device) {
        // if we are listening to selection coming from the ui, then we do nothing, as
        // any change in the devices/clients, will be handled by the UI, and we'll receive
        // selection notification through our implementation of IUiSelectionListener.
        if (mListeningToUiSelection == false) {
            // test if the disconnected device was the default selection.
            if (mCurrentDevice == device) {
                // try to find a new device
                AndroidDebugBridge bridge = AndroidDebugBridge.getBridge();
                if (bridge != null) {
                    // get the device list
                    IDevice[] devices = bridge.getDevices();

                    // check if we still have devices
                    if (devices.length == 0) {
                        handleDefaultSelection((IDevice)null);
                    } else {
                        handleDefaultSelection(devices[0]);
                    }
                } else {
                    handleDefaultSelection((IDevice)null);
                }
            }
        }
    }

    /**
     * Sent when a device data changed, or when clients are started/terminated on the device.
     * <p/>
     * This is sent from a non UI thread.
     * @param device the device that was updated.
     * @param changeMask the mask indicating what changed.
     *
     * @see IDeviceChangeListener#deviceChanged(IDevice)
     */
    @Override
    public void deviceChanged(IDevice device, int changeMask) {
        // if we are listening to selection coming from the ui, then we do nothing, as
        // any change in the devices/clients, will be handled by the UI, and we'll receive
        // selection notification through our implementation of IUiSelectionListener.
        if (mListeningToUiSelection == false) {

            // check if this is our device
            if (device == mCurrentDevice) {
                if (mCurrentClient == null) {
                    handleDefaultSelection(device);
                } else {
                    // get the clients and make sure ours is still in there.
                    Client[] clients = device.getClients();
                    boolean foundClient = false;
                    for (Client client : clients) {
                        if (client == mCurrentClient) {
                            foundClient = true;
                            break;
                        }
                    }

                    // if we haven't found our client, lets look for a new one
                    if (foundClient == false) {
                        mCurrentClient = null;
                        handleDefaultSelection(device);
                    }
                }
            }
        }
    }

    /**
     * Sent when a new {@link IDevice} and {@link Client} are selected.
     * @param selectedDevice the selected device. If null, no devices are selected.
     * @param selectedClient The selected client. If null, no clients are selected.
     */
    @Override
    public synchronized void selectionChanged(IDevice selectedDevice, Client selectedClient) {
        if (mCurrentDevice != selectedDevice) {
            mCurrentDevice = selectedDevice;

            // notify of the new default device
            for (ISelectionListener listener : mListeners) {
                listener.selectionChanged(mCurrentDevice);
            }
        }

        if (mCurrentClient != selectedClient) {
            mCurrentClient = selectedClient;

            // notify of the new default client
            for (ISelectionListener listener : mListeners) {
                listener.selectionChanged(mCurrentClient);
            }
        }
    }

    /**
     * Handles a default selection of a {@link IDevice} and {@link Client}.
     * @param device the selected device
     */
    private void handleDefaultSelection(final IDevice device) {
        // because the listener expect to receive this from the UI thread, and this is called
        // from the AndroidDebugBridge notifications, we need to run this in the UI thread.
        try {
            Display display = getDisplay();

            display.asyncExec(new Runnable() {
                @Override
                public void run() {
                    // set the new device if different.
                    boolean newDevice = false;
                    if (mCurrentDevice != device) {
                        mCurrentDevice = device;
                        newDevice = true;

                        // notify of the new default device
                        for (ISelectionListener listener : mListeners) {
                            listener.selectionChanged(mCurrentDevice);
                        }
                    }

                    if (device != null) {
                        // if this is a device switch or the same device but we didn't find a valid
                        // client the last time, we go look for a client to use again.
                        if (newDevice || mCurrentClient == null) {
                            // now get the new client
                            Client[] clients =  device.getClients();
                            if (clients.length > 0) {
                                handleDefaultSelection(clients[0]);
                            } else {
                                handleDefaultSelection((Client)null);
                            }
                        }
                    } else {
                        handleDefaultSelection((Client)null);
                    }
                }
            });
        } catch (SWTException e) {
            // display is disposed. Do nothing since we're quitting anyway.
        }
    }

    private void handleDefaultSelection(Client client) {
        mCurrentClient = client;

        // notify of the new default client
        for (ISelectionListener listener : mListeners) {
            listener.selectionChanged(mCurrentClient);
        }
    }

    /**
     * Prints a message, associated with a project to the specified stream
     * @param stream The stream to write to
     * @param tag The tag associated to the message. Can be null
     * @param message The message to print.
     */
    private static synchronized void printToStream(MessageConsoleStream stream, String tag,
            String message) {
        String dateTag = getMessageTag(tag);

        stream.print(dateTag);
        if (!dateTag.endsWith(" ")) {
            stream.print(" ");          //$NON-NLS-1$
        }
        stream.println(message);
    }

    /**
     * Creates a string containing the current date/time, and the tag
     * @param tag The tag associated to the message. Can be null
     * @return The dateTag
     */
    private static String getMessageTag(String tag) {
        Calendar c = Calendar.getInstance();

        if (tag == null) {
            return String.format(Messages.DdmsPlugin_Message_Tag_Mask_1, c);
        }

        return String.format(Messages.DdmsPlugin_Message_Tag_Mask_2, c, tag);
    }

    /**
     * Implementation of com.android.ddmuilib.StackTracePanel.ISourceRevealer.
     */
    @Override
    public void reveal(String applicationName, String className, int line) {
        JavaSourceRevealer.reveal(applicationName, className, line);
    }

    public boolean launchTraceview(String osPath) {
        if (mTraceviewLaunchers != null) {
            for (ITraceviewLauncher launcher : mTraceviewLaunchers) {
                try {
                    if (launcher.openFile(osPath)) {
                        return true;
                    }
                } catch (Throwable t) {
                    // ignore, we'll just not use this implementation.
                }
            }
        }

        return false;
    }

    /**
     * Returns the list of clients that extend the clientAction extension point.
     */
    @NonNull
    public synchronized List<IClientAction> getClientSpecificActions() {
        if (mClientSpecificActions == null) {
            // get available client specific action extensions
            IConfigurationElement[] elements =
                    findConfigElements("com.android.ide.eclipse.ddms.clientAction"); //$NON-NLS-1$
            try {
                mClientSpecificActions = instantiateClientSpecificActions(elements);
            } catch (CoreException e) {
                mClientSpecificActions = Collections.emptyList();
            }
        }

        return mClientSpecificActions;
    }

    private LogCatMonitor mLogCatMonitor;
    public void startLogCatMonitor(IDevice device) {
        if (mLogCatMonitor == null) {
            mLogCatMonitor = new LogCatMonitor(getDebuggerConnectors(), getPreferenceStore());
        }

        mLogCatMonitor.monitorDevice(device);
    }

    /** Returns an image descriptor for the image file at the given plug-in relative path */
    public static ImageDescriptor getImageDescriptor(String path) {
        return imageDescriptorFromPlugin(PLUGIN_ID, path);
    }
}