org.op4j.devutils.selected.SelectedImplFileCreator.java Source code

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Here is the source code for org.op4j.devutils.selected.SelectedImplFileCreator.java

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/*
 * =============================================================================
 * 
 *   Copyright (c) 2008, The OP4J team (http://www.op4j.org)
 * 
 *   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.op4j.devutils.selected;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import org.apache.commons.lang.StringUtils;

/**
 * 
 * @since 1.0
 * 
 * @author Daniel Fernández
 *
 */
public class SelectedImplFileCreator {

    private static int filesCreated = 0;

    private static Class<?>[] getClasses(String packageName) throws ClassNotFoundException, IOException {

        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        String path = packageName.replace('.', '/');
        Enumeration<URL> resources = classLoader.getResources(path);
        List<File> dirs = new ArrayList<File>();
        while (resources.hasMoreElements()) {
            URL resource = resources.nextElement();
            dirs.add(new File(resource.getFile().replaceAll("%20", " ")));
        }
        ArrayList<Class<?>> classes = new ArrayList<Class<?>>();
        for (File directory : dirs) {
            classes.addAll(findClasses(directory, packageName));
        }
        return classes.toArray(new Class[classes.size()]);
    }

    private static List<Class<?>> findClasses(File directory, String packageName) throws ClassNotFoundException {

        List<Class<?>> classes = new ArrayList<Class<?>>();
        if (!directory.exists()) {
            return classes;
        }
        File[] files = directory.listFiles();
        for (File file : files) {
            if (file.isDirectory()) {
                assert !file.getName().contains(".");
                classes.addAll(findClasses(file, packageName + "." + file.getName()));
            } else if (file.getName().endsWith(".class")) {
                classes.add(Class
                        .forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
            }
        }
        return classes;
    }

    private static void createFile(final String structureName, final String className, final ImplFile implFile)
            throws Exception {

        final URL templateFileURL = Thread.currentThread().getContextClassLoader()
                .getResource("OneLevelMapStructureLevel0SelectedOperator.txt");

        final String operatorsFolderName = (StringUtils.substringBeforeLast(
                StringUtils.substringBeforeLast(templateFileURL.getPath(), "/"), "/") + "/operators")
                        .replaceAll("%20", " ");

        final File operatorsFolder = new File(operatorsFolderName);
        operatorsFolder.mkdir();

        final String folderFragment = (implFile.getImplType() == ImplType.OP ? "/impl/op/" : "/impl/fn/");

        final File implFolder = new File(operatorsFolderName + "/impl");
        implFolder.mkdir();

        final File implFnFolder = new File(operatorsFolderName + "/impl/fn");
        implFnFolder.mkdir();

        final File implOpFolder = new File(operatorsFolderName + "/impl/op");
        implOpFolder.mkdir();

        final File structureFolder = new File(operatorsFolderName + folderFragment + structureName.toLowerCase());
        structureFolder.mkdir();

        final File resultFile = new File(
                operatorsFolderName + folderFragment + structureName.toLowerCase() + "/" + className);
        final FileWriter writer = new FileWriter(resultFile);

        writer.write(implFile.computeFileContents());

        writer.close();

        System.out.println("Created: " + resultFile.getAbsolutePath());
        filesCreated++;

    }

    public static void main(String[] args) {

        Class<?> currentClass = null;
        try {

            final Class<?>[] classesInPackage = getClasses("org.op4j.operators.intf");
            for (Class<?> clazz : classesInPackage) {

                currentClass = clazz;

                if (clazz.getSimpleName().contains("Selected") && !clazz.getSimpleName().contains("Unmodifiable")) {

                    final ImplFile implOpFile = new ImplFile(ImplType.OP, clazz);
                    createFile(StringUtils.substringAfterLast(implOpFile.getPackageName(), "."),
                            StringUtils.substringBefore(implOpFile.getClassName(), "<") + ".java", implOpFile);
                    final ImplFile implFnFile = new ImplFile(ImplType.FN, clazz);
                    createFile(StringUtils.substringAfterLast(implFnFile.getPackageName(), "."),
                            StringUtils.substringBefore(implFnFile.getClassName(), "<") + ".java", implFnFile);

                }

            }

            System.out.println("\n " + filesCreated + " files created.");

        } catch (final Exception e) {
            System.err.println("ERROR PROCESSING : " + currentClass.getName());
            e.printStackTrace();
        }

    }

}