protected ScmResult executeCommand()

in maven-release-plugin/src/it/setup/maven-scm-provider-stub/src/main/java/org/apache/maven/scm/provider/stub/StubCheckOutCommand.java [52:127]
65 lines of code
11 McCabe index (conditional complexity)

    protected ScmResult executeCommand( ScmProviderRepository repository, ScmFileSet fileSet,
                                        CommandParameters parameters )
        throws ScmException
    {
        List checkedOutFiles = new ArrayList();

        try
        {
            StubScmProviderRepository stubRepo = (StubScmProviderRepository) repository;

            File workingCopyRoot = fileSet.getBasedir();
            ScmVersion version = parameters.getScmVersion( CommandParameter.SCM_VERSION );
            File revRoot;
            if ( version instanceof ScmTag )
            {
                revRoot = new File( stubRepo.getTagBase(), version.getName() );
            }
            else if ( version instanceof ScmBranch )
            {
                revRoot = new File( stubRepo.getBranchBase(), version.getName() );
            }
            else
            {
                revRoot = stubRepo.getRoot();
            }

            logger.info( "Checking out: " + revRoot + " > " + workingCopyRoot );

            if ( workingCopyRoot.isFile() )
            {
                throw new IOException( "Cannot check out into exising file" );
            }
            if ( workingCopyRoot.isDirectory() && workingCopyRoot.list().length > 0 )
            {
                throw new IOException( "Cannot check out into non-empty directory" );
            }

            List paths = stubRepo.getPaths( workingCopyRoot, fileSet );
            if ( paths.isEmpty() )
            {
                paths.add( "." );
            }

            new File( workingCopyRoot, StubScmProviderRepository.WORKING_COPY_ROOT_MARKER_FILE ).createNewFile();

            for ( Iterator it = paths.iterator(); it.hasNext(); )
            {
                String path = (String) it.next();
                File srcFile = new File( revRoot, path );
                File dstFile = new File( workingCopyRoot, path );

                logger.info( "  " + path );

                if ( srcFile.isDirectory() )
                {
                    FileUtils.copyDirectoryStructure( srcFile, dstFile );
                }
                else if ( srcFile.isFile() )
                {
                    FileUtils.copyFile( srcFile, dstFile );
                }
                else
                {
                    throw new IOException( "Cannot check out non-existing file: " + srcFile );
                }

                checkedOutFiles.add( new ScmFile( path, ScmFileStatus.CHECKED_OUT ) );
            }
        }
        catch ( IOException e )
        {
            throw new ScmException( "Error while checking out the files.", e );
        }

        return new CheckOutScmResult( null, checkedOutFiles );
    }