/src/main/java/com/atlassian/bamboo/plugin/dotnet/visualstudio/RunnerExtractor.java

package com.atlassian.bamboo.plugin.dotnet.visualstudio;



import com.atlassian.bamboo.build.fileserver.BuildDirectoryManager;

import com.atlassian.spring.container.LazyComponentReference;

import com.atlassian.util.concurrent.LazyReference;

import net.jcip.annotations.ThreadSafe;

import org.apache.commons.io.IOUtils;

import org.apache.log4j.Logger;

import org.jetbrains.annotations.NotNull;



import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;



/**

 * Extracts various wrapper scripts from the plugin classpath in a thread safe way

 */

@ThreadSafe

public class RunnerExtractor

{

    @SuppressWarnings("unused")

    private static final Logger log = Logger.getLogger(RunnerExtractor.class);

    // ------------------------------------------------------------------------------------------------------- Constants



    private static final LazyComponentReference<BuildDirectoryManager> BUILD_DIRECTORY_MANAGER_REFERENCE = new LazyComponentReference<BuildDirectoryManager>("buildDirectoryManager");



    private static final LazyReference<String> DOTNET_RUNNERS_HOME = new LazyReference<String>()

    {

        @Override

        protected String create() throws Exception

        {

            File file = new File(BUILD_DIRECTORY_MANAGER_REFERENCE.get().getApplicationHome(), "DotNetSupport");

            file.mkdirs();

            return file.getAbsolutePath();

        }

    };



    private static final LazyReference<String> DEVENV_RUNNER_REFERENCE = new LazyReference<String>()

    {

        @Override

        protected String create() throws Exception

        {

            return extract("/com/atlassian/bamboo/plugin/dotnet/visualstudio/devenvrunner.bat", "devenvrunner.bat");

        }

    };



    // ------------------------------------------------------------------------------------------------- Type Properties

    // ---------------------------------------------------------------------------------------------------- Dependencies

    // ---------------------------------------------------------------------------------------------------- Constructors



    private RunnerExtractor()

    {

    }



    // ----------------------------------------------------------------------------------------------- Interface Methods

    // -------------------------------------------------------------------------------------------------- Action Methods

    // -------------------------------------------------------------------------------------------------- Public Methods



    /**

     * Get the path to Bamboo's external devenv wrapper batch file

     * @return path

     */

    public static String getDevenvRunnerPath()

    {

        return DEVENV_RUNNER_REFERENCE.get();

    }



    // -------------------------------------------------------------------------------------- Basic Accessors / Mutators



    private static String extract(@NotNull String resourceName, String filename) throws IOException

    {

        InputStream inputStream = null;

        OutputStream outputStream = null;

        try

        {

            inputStream = RunnerExtractor.class.getResourceAsStream(resourceName);

            if (inputStream == null)

            {

                throw new IllegalStateException("Could not find '" + resourceName +  "' on classpath");

            }



            File file = new File(DOTNET_RUNNERS_HOME.get(), filename);

            outputStream = new FileOutputStream(file);

            IOUtils.copy(inputStream, outputStream);

            return file.getAbsolutePath();

        }

        finally

        {

            IOUtils.closeQuietly(inputStream);

            IOUtils.closeQuietly(outputStream);

        }

    }

}