src/plugins/android.codeutils/src/com/motorola/studio/android/db/deployment/DatabaseDeployer.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.db.deployment;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Map;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Platform;

import com.motorola.studio.android.codeutils.db.utils.DatabaseUtils;
import com.motorola.studio.android.common.IAndroidConstants;
import com.motorola.studio.android.common.utilities.FileUtil;

/**
 * Handles database deployment in devices and plug-in projects.
 */
public class DatabaseDeployer
{

    /**
     * Plug-in Identifier
     */
    private static final String PLUGIN_IDENTIFIER = "com.motorola.studio.android.codeutils";

    /**
     * Constant representing the location of the DatabaseHelper class.
     */
    private static final String DATABASE_HELPER_CLASS_LOCATION =
            "resources/databaseDeploy/DatabaseHelperjava.txt"; //$NON-NLS-1$

    /**
     * This constant represents the value of the to-be-copied Database Name
     */
    public static final String DATABASE_NAME = "#dbName#";

    /**
     * This constant represents the value of newly-created Android Application Package Name for the Database
     */
    public static final String APPLICATION_DATABASE_NAMESPACE = "#applicationPackageNamespace#";

    /**
     * Directory of the Database Helper in the android project
     */
    public static final String ANDROID_PROJECT_PACKAGE_NAME = "#packageName#"; //$NON-NLS-1$

    /**
     * Open Helper Package Name
     */
    public static final String OPEN_HELPER_PACKAGE_NAME = "#databaseOpenHelperPackageName#"; //$NON-NLS-1$

    /**
     * File name of the Database Helper in the android project
     */
    public static final String DATABASE_HELPER_CLASS_NAME = "#className#"; //$NON-NLS-1$

    /**
     * Copy the DatabaseHelper deploy file to the newly-created-android-plu-in.
     * 
     * @param project Newly-created-android Project
     * @param parameters Parameters to replace in the DatabaseHelper class file
     * @param monitor Monitor
     * 
     * @throws IOException Exception thrown in case there are problems accessing data of a file.
     * @throws CoreException Exception thrown in case there are problems accessing a file itself.
     */
    public static void copyDataBaseDeployerClassToProject(IProject project,
            Map<String, String> parameters, IProgressMonitor monitor) throws IOException,
            CoreException
    {
        // get the destination folder
        IFolder destinationFolder =
                project.getFolder(IAndroidConstants.WS_ROOT + IAndroidConstants.FD_SOURCES);
        // split the new sequence of folders - they will be created, one by one
        String[] folders =
                parameters.get(ANDROID_PROJECT_PACKAGE_NAME).split(IAndroidConstants.RE_DOT);
        // iterate through the folders and create them
        if ((folders != null) && (folders.length > 0))
        {
            // iterate
            for (String folder : folders)
            {
                // get destination folder with the next one to be created
                destinationFolder = destinationFolder.getFolder(folder);

                // proceed in case the destination folder does not exists and can be created
                if (!destinationFolder.exists())
                {
                    // create the folder
                    destinationFolder.create(true, true, monitor);
                }
            }
        }

        // get the destination file
        IFile destinationFile =
                destinationFolder.getFile(parameters.get(DATABASE_HELPER_CLASS_NAME)
                        + IAndroidConstants.DOT_JAVA);
        // proceed in case it does not exist and can be created
        if (!destinationFile.exists() && FileUtil.canWrite(destinationFile))
        {
            // get the Database Helper class as a text
            String databaseHelperText = readDatabaseHelperClassFile(project, parameters);

            // transform it in a stream
            InputStream stream = null;

            try
            {
                stream = new ByteArrayInputStream(databaseHelperText.getBytes("UTF-8")); //$NON-NLS-1$
                // create the destination folder
                destinationFile.create(stream, true, monitor);

                DatabaseUtils.formatCode(destinationFile, databaseHelperText, monitor);
            }
            finally
            {
                if (stream != null)
                {
                    stream.close();
                }
            }
        }
    }

    /**
     * Read the DatabaseHelper class file, replace the parameter maps
     * and return it as a String.
     * 
     * @param project Project where the DatabaseHelper is retrieved.
     * @param parameters Parameters for replacement in the DatabaseHelper class file.
     * 
     * @return a String representing the DatabaseHelper class file.
     * 
     * @throws IOException Exception thrown when there are problems reading elements from the
     * DatabaseHelper class file.
     */
    private static String readDatabaseHelperClassFile(IProject project,
            Map<String, String> parameters) throws IOException
    {
        URL url = Platform.getBundle(PLUGIN_IDENTIFIER).getEntry(DATABASE_HELPER_CLASS_LOCATION);
        url = FileLocator.toFileURL(url);

        // string buffer which holds the file as a text
        StringBuffer databaseHelperBuffer = new StringBuffer("");
        // reader
        BufferedReader databaseHelperReader = null;

        // get the file to be read
        File f = null;
        try
        {
            f = new File(url.getFile());
            // create the reader to manipulate the file
            databaseHelperReader = new BufferedReader(new FileReader(f));

            // read the Database Helper class file in steps (using buffer)
            String buffer = null;

            // iterate while there is stuff to read
            while ((buffer = databaseHelperReader.readLine()) != null)
            {
                // read and put the content in the string buffer element
                databaseHelperBuffer.append(buffer);
                databaseHelperBuffer.append(System.getProperty("line.separator"));
            }

        }
        finally
        {
            // close reader
            if (databaseHelperReader != null)
            {
                databaseHelperReader.close();
            }
        }

        // string holding the "text" of the DatabaseHelper class
        String databaseHelperText = "";
        // proceed in case there is stuff in the buffer to read
        if (databaseHelperBuffer != null)
        {
            databaseHelperText = databaseHelperBuffer.toString();

            // iterate through the parameters and replace the parameters in the map
            if (parameters != null)
            {
                for (String key : parameters.keySet())
                {
                    databaseHelperText = databaseHelperText.replaceAll(key, parameters.get(key));
                }
            }
        }
        // return the file as a text
        return databaseHelperText;
    }
}