MavenLocalRepositoryUtils.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.guvnor.common.services.project.backend.server;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.attribute.BasicFileAttributes;

import org.guvnor.common.services.project.model.GAV;

public class MavenLocalRepositoryUtils {

    /**
     * Get a Path pointing to a transient M2 Local Repository
     * @param gav GAV (helper to name temporary folder)
     * @return
     * @throws IOException
     */
    public static java.nio.file.Path getRepositoryPath( final GAV gav ) throws IOException {
        final java.nio.file.Path tempLocalRepositoryBasePath = java.nio.file.Files.createTempDirectory( "m2-" + toFileName( gav ) );
        return tempLocalRepositoryBasePath;
    }

    private static String toFileName( final GAV gav ) {
        final StringBuilder sb = new StringBuilder();
        sb.append( "m2-" ).append( gav.getGroupId() + "-" + gav.getArtifactId() + "-" + gav.getVersion() );
        return sb.toString();
    }

    /**
     * Destroy the temporary local Maven Repository and all content.
     * @param m2Folder
     */
    public static void tearDownMavenRepository( final java.nio.file.Path m2Folder ) {
        if ( m2Folder != null ) {
            try {
                Files.walkFileTree( m2Folder,
                                    new java.nio.file.SimpleFileVisitor<java.nio.file.Path>() {

                                        @Override
                                        public FileVisitResult visitFile( final java.nio.file.Path file,
                                                                          final BasicFileAttributes attrs ) throws IOException {
                                            Files.delete( file );
                                            return FileVisitResult.CONTINUE;
                                        }

                                        @Override
                                        public FileVisitResult postVisitDirectory( final java.nio.file.Path dir,
                                                                                   final IOException exc ) throws IOException {
                                            Files.delete( dir );
                                            return FileVisitResult.CONTINUE;
                                        }

                                    } );
            } catch ( IOException ioe ) {
                //Swallow
            }
        }
    }

}