utils/eclipselink.utils.rename/src/main/java/org/eclipse/persistence/utils/rename/MigrateTopLinkToEclipseLink.java

/*
 * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.utils.rename;

import java.io.*;
import java.util.*;

/**
 * Provides a product rename utility specific to moving Oracle TopLink source to EclipseLink.
 * In addition to invoking the package-rename utility it also clears out the target folder
 * except the doNotDeleteFiles. When copying and renaming classes the renamer will NOT replace
 * existing files. This allows us to modify target files and keep the modifications from future
 * executions overwriting them.
 *
 * @author djclarke
 *
 */
public class MigrateTopLinkToEclipseLink {
    private static final String PROPERTIES_FILE = "package-rename.properties";

    public static void main(String[] args) {
        if (args.length < 2 || args.length > 3){
            System.out.println("Usage: MigrateTopLinkToEclipseLink sourceDir targetDir (propertiesFile)");
        }
        String source = args[0];
        String target = args[1];
        String propertiesFile = PROPERTIES_FILE;
        if (args.length == 3){
            propertiesFile = args[2];
        }
        new MigrateTopLinkToEclipseLink().migrate(source, target, propertiesFile);
    }

    public void migrate(String source, String target, String propertiesFile) {
        Properties props = readProperties(propertiesFile);

        clearTargetFolder(target);

        PackageRenamer renamer = new PackageRenamer(source, target, props);

        renamer.run();
    }

    private void clearTargetFolder(String targetFolder) {
        File folder = new File(targetFolder);

        if (folder.exists()) {
            removeAllJavaFiles(folder);
        }
    }

    private void removeAllJavaFiles(File folder) {
        File[] contents = folder.listFiles();

        for (int index = 0; contents != null && index < contents.length; index++) {
            File file = contents[index];

            if (file.isDirectory()) {
                removeAllJavaFiles(file);
            } else {
                if (file.getName().endsWith(".java")) {
                    file.delete();
                }
            }
        }
    }

    private Properties readProperties(String filename) {
        Properties props = new Properties();
        try {
            InputStream in = new FileInputStream(filename);
            props.load(in);
            in.close();
        } catch (FileNotFoundException fileNotFoundException) {
            throw new RuntimeException("Properties file was not found: "
                    + filename);
        } catch (IOException ioException) {
            throw new RuntimeException(
                    "IO error occurred while reading the properties file:'"
                            + filename + "'" + ioException.getMessage());
        }

        return props;
    }
}