/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package com.nokia.mj.impl.file;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.Enumeration;

import java.util.Vector;

import javax.microedition.io.Connector;

import javax.microedition.io.file.ConnectionClosedException;

import javax.microedition.io.file.FileConnection;

import javax.microedition.io.file.IllegalModeException;

import com.nokia.mj.impl.fileutils.FileUtility;

import com.nokia.mj.impl.fileutils.FileUTF8Handler;

import com.nokia.mj.impl.rt.support.ApplicationUtils;

import com.nokia.mj.impl.rt.support.Finalizer;

import com.nokia.mj.impl.rt.support.Jvm;

/**

 * FileConnectionImpl implements all the methods of

 * javax.microedition.io.file.FileConnection;

 */

public final class FileConnectionImpl implements FileConnection

{

    static

    {

        try

        {

            Jvm.loadSystemLibrary("javafile");

        }

        catch (Exception e)

        {

            FileLogger.ELog("Unable to load javafile native library");

        }

    }

    private FileUtility iFileUtility;

    private Finalizer iFinalizer;

    private boolean iIsOpen;

    private int iMode;

    private String iInitialUrl;

    private String FILE_LOCALHOST = "//localhost/";

    private String FILE_SIMPLE = "///";

    private FileConnectionURL iFileConnectionUrl;

    public FileConnectionImpl(String aName, int aMode, boolean aTimeouts)

    throws IOException

    {

        iInitialUrl = "file:" + aName;

        String decodedUrl = FileUTF8Handler.decode(iInitialUrl);

        decodedUrl = decodedUrl.replace('|', ':');

        // Validate File URL first.

        FileConnectionURL.checkFileUrlValidity(decodedUrl);

        String actual = FileUrlValidator.validateFileUrl(decodedUrl);

        if (iInitialUrl.startsWith("file:" + FILE_SIMPLE))

        {

            // Construct a FileConnectionURL type if the validation passes.

            iFileConnectionUrl = new FileConnectionURL(iInitialUrl, "file:///"

                    + actual, false);

        }

        else

        {

            // Construct a FileConnectionURL type if the validation passes.

            iFileConnectionUrl = new FileConnectionURL(iInitialUrl,

                    "file://localhost/" + actual, false);

        }

        // Check access.

        checkAccess(actual, aMode, true);

        // Go ahead to prompt the user

        checkSecurityPermission(actual, aMode);

        FileLogger.Log("FileConnectionImpl: Creating FileUtility With: "

                       + actual);

        // FileUtility can handle multiple "//" in the path.

        // Need to check it ourselves.

        if (actual.indexOf("//") != -1)

        {

            throw new IllegalArgumentException("Invalid Uri :" + aName);

        }

        iFileUtility = new FileUtility(actual);

        iFinalizer = registerFinalize();

        iIsOpen = true;

        iMode = aMode;

        FileLogger.Log("FileConnectionImpl: Connector.open succeeded");

    }

    /**

     * Registers with Finalizer to call a method when the object gets collected

     * by GC

     *

     * @return Finalizer object that will be notified when GC happens

     */

    private Finalizer registerFinalize()

    {

        return new Finalizer()

        {

            public void finalizeImpl()

            {

                doFinalize();

            }

        };

    }

    /**

     * Checks for already granted permissions and prompts the user if access is

     * allowed to the particular path. Prompting is delegated to

     * ApplicationUtils

     *

     * @param aAbsolutePath

     *            target to which the connection is currently open

     * @param aMode

     *            can either be FileAccessHelper.INTENT_READ or

     *            FileAccessHelper.INTENT_WRITE

     */

    private static void checkSecurityPermission(String aAbsolutePath, int aMode)

    {

        ApplicationUtils appUtils = ApplicationUtils.getInstance();

        String accessIntent = (aMode == Connector.READ) ? FileAccessHelper.INTENT_READ

                              : FileAccessHelper.INTENT_WRITE;

        FileLogger.Log("FileConnectionImpl: Check Permission to "

                       + aAbsolutePath + " in " + accessIntent + " mode");

        // Go ahead to prompt the user

        if (Connector.READ_WRITE == aMode)

        {

            FileInternalPermission permission = new FileInternalPermission(

                aAbsolutePath, FileAccessHelper.INTENT_READ);

            appUtils.checkPermission(permission);

            FileInternalPermission permission1 = new FileInternalPermission(

                aAbsolutePath, FileAccessHelper.INTENT_WRITE);

            appUtils.checkPermission(permission1);

        }

        else

        {

            FileInternalPermission permission = new FileInternalPermission(

                aAbsolutePath, accessIntent);

            appUtils.checkPermission(permission);

        }

    }

    /**

     * Checks access to a specified path given its absolute path and the mode in

     * which the connection has been opened.

     *

     * @param aAbsolutePath

     *            path of the connection

     * @param aMode

     *            mode in which the connection has been opened.

     * @throws SecurityException

     *             in case access was allowed for the application for the given

     *             intent and target.

     */

    private static void checkAccess(String aAbsolutePath, int aMode)

    {

        checkAccess(aAbsolutePath, aMode, false);

    }

    /**

     * Checks access to a specified path given its absolute path and the mode in

     * which the connection has been opened.

     *

     * @param aAbsolutePath

     *            path of the connection

     * @param aMode

     *            mode in which the connection has been opened.

     * @param aIsOpening

     *            specifies if the access check is being made on a method that

     *            is considered as open operation (setFileConnection and

     *            Connector.open)

     * @throws SecurityException

     *             in case access was allowed for the application for the given

     *             intent and target.

     */

    private static void checkAccess(String aAbsolutePath, int aMode,

                                    boolean aIsOpening)

    {

        FileLogger.Log("FileConnectionImpl: Check Access to " + aAbsolutePath

                       + " in " + aMode + " mode");

        String modeString;

        switch (aMode)

        {

        case Connector.READ:

            modeString = FileAccessHelper.INTENT_READ;

            break;

        case Connector.WRITE:

            modeString = FileAccessHelper.INTENT_WRITE;

            break;

        default:

            modeString = FileAccessHelper.INTENT_READ_WRITE;

        }

        if (!(FileAccessHelper.accessAllowed(aAbsolutePath, modeString,

                                             FileSystemUtils.getProtectionDomain(), aIsOpening)))

        {

            // Access to the specified path not allowed.

            // Throw Security Exception

            throw new SecurityException("Permission denied: " + aAbsolutePath);

        }

    }

    private synchronized void doFinalize()

    {

        iFileUtility = null;

    }

    public void close()

    {

        iIsOpen = false;

        iFileUtility = null;

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public final void create() throws IOException

    {

        checkConnection();

        checkConnectionMode(Connector.READ);

        String domain = FileSystemUtils.getProtectionDomain();

        // We need to check if we have access to base directory and not the file

        // itself :-)

        if (!FileAccessHelper.isCreateAllowedWithinDir(iFileUtility.getPath(),

                domain))

        {

            throw new SecurityException("Permission denied: "

                                        + iFileUtility.getAbsolutePath());

        }

        if (!iFileUtility.createNewFile())

        {

            FileLogger.WLog("FileConnectionImpl: File Creation failed. "

                            + "Throwing IOException");

            throw new IOException("Unable to create file: "

                                  + iFileUtility.getAbsolutePath());

        }

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public final void rename(String aName) throws IOException

    {

        FileLogger.Log("FileConnectionImpl: rename(): " + aName);

        checkConnection();

        checkConnectionMode(Connector.READ);

        checkAccess(iFileUtility.getAbsolutePath(), Connector.WRITE);

        if (!iFileUtility.rename(aName))

        {

            FileLogger

            .ELog("FileConnectionImpl: File rename failed. Throwing IOException");

            throw new IOException("Unable to rename file or directory: "

                                  + iFileUtility.getAbsolutePath());

        }

        String curUrl = iFileConnectionUrl.getUrl();

        if (curUrl.endsWith("/"))

        {

            // Remove trailing "/"

            curUrl = curUrl.substring(0, curUrl.length() - 1);

        }

        String newUrl = curUrl.substring(0, curUrl.lastIndexOf('/') + 1);

        newUrl += iFileUtility.getName();

        iFileConnectionUrl = new FileConnectionURL(newUrl);

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public final void mkdir() throws IOException

    {

        checkConnection();

        checkConnectionMode(Connector.READ);

        checkAccess(iFileUtility.getAbsolutePath(), Connector.WRITE);

        FileLogger.Log("FileConnectionImpl: mkdir(): "

                       + iFileUtility.getAbsolutePath());

        if (!iFileUtility.mkdir())

        {

            FileLogger.WLog("  FileConnectionImpl: "

                            + "FileUtility was unable to create directory.");

            throw new IOException("Unable to create directory: "

                                  + iFileUtility.getAbsolutePath());

        }

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public final void delete() throws IOException

    {

        checkConnection();

        checkConnectionMode(Connector.READ);

        checkAccess(iFileUtility.getAbsolutePath(), Connector.WRITE);

        FileLogger.Log("FileConnectionImpl: delete(): "

                       + iFileUtility.getAbsolutePath());

        try

        {

            if (!iFileUtility.delete())

            {

                FileLogger.WLog("FileConnectionImpl: Unable to delete file. "

                                + "Throwing IOException.");

                throw new IOException("Unable to delete file or directory: "

                                      + iFileUtility.getAbsolutePath());

            }

        }

        catch (SecurityException ex)

        {

            throw new IOException("Unable to delete file or directory: "

                                  + iFileUtility.getAbsolutePath());

        }

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public boolean exists()

    {

        checkConnection();

        checkConnectionMode(Connector.WRITE);

        return iFileUtility.exists();

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public String getName()

    {

        String name = iFileConnectionUrl.getName();

        if (name.equals(""))

        {

            return "";

        }

        if (iFileUtility.isDirectory())

        {

            name += "/";

        }

        else if (!iFileUtility.exists())

        {

            // If it does not exist, and of the initial url ended with "/"

            // we must return with a trailing "/"

            if (iInitialUrl.endsWith("/"))

            {

                name += "/";

            }

        }

        return name;

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public String getPath()

    {

        String path = iFileConnectionUrl.getPath();

        return path;

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public String getURL()

    {

        String ret = iFileConnectionUrl.getUrl();

        if (iFileUtility.isDirectory())

        {

            if (!ret.endsWith("/"))

            {

                ret += "/";

            }

        }

        else

        {

            if (iFileUtility.isFile())

            {

                if (ret.endsWith("/"))

                {

                    ret = ret.substring(0, ret.length() - 1);

                }

            }

        }

        return ret;

    }

    /**

     * Please refer JSR 75 for more details.

     *

     */

    public boolean isOpen()

    {

        return iIsOpen;

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public boolean canRead()

    {

        // Access Check

        checkConnection();

        checkConnectionMode(Connector.WRITE);

        return iFileUtility.canRead();

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public boolean canWrite()

    {

        // Access Check

        checkConnection();

        checkConnectionMode(Connector.WRITE);

        if (Connector.READ == iMode)

        {

            return false;

        }

        return iFileUtility.canWrite();

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public long lastModified()

    {

        checkConnection();

        checkConnectionMode(Connector.WRITE);

        return iFileUtility.lastModified();

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public boolean isDirectory()

    {

        checkConnection();

        checkConnectionMode(Connector.WRITE);

        return iFileUtility.isDirectory();

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public void setReadable(boolean aReadable) throws IOException

    {

        checkConnection();

        checkAccess(iFileUtility.getAbsolutePath(), Connector.WRITE);

        checkConnectionMode(Connector.READ);

        iFileUtility.setReadable(aReadable);

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public void setWritable(boolean aWritable) throws IOException

    {

        checkConnection();

        checkAccess(iFileUtility.getAbsolutePath(), Connector.WRITE);

        checkConnectionMode(Connector.READ);

        iFileUtility.setWritable(aWritable);

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public void setHidden(boolean aHidden) throws IOException

    {

        checkConnection();

        checkAccess(iFileUtility.getAbsolutePath(), Connector.WRITE);

        checkConnectionMode(Connector.READ);

        iFileUtility.setHidden(aHidden);

    }

    /**

     * Please refer JSR 75 for more details.

     */

    public Enumeration list() throws IOException

    {

        return list("*", false);

    }

    /**

     * Please refer JSR 75 for more details.