# LQMGMain.java

    /*
     * Copyright (C) 2011 Everit Kft. (http://www.everit.biz)
     *
     * 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.everit.persistence.lqmg;

    import org.apache.commons.cli.BasicParser;
    import org.apache.commons.cli.CommandLine;
    import org.apache.commons.cli.CommandLineParser;
    import org.apache.commons.cli.HelpFormatter;
    import org.apache.commons.cli.Options;
    import org.apache.commons.cli.ParseException;

    /**
     * The main class of the LQMG.
     */
    public final class LQMGMain {

      public static final String ARG_BUNDLES = "bundles";

      public static final String ARG_CAPABILITY = "capability";

      public static final String ARG_DEFAULT_SCHEMA = "defaultSchema";

      public static final String ARG_HACK_WIRES = "hackWires";

      public static final String ARG_INNER_CLASSES_FOR_KEYS = "innerClassesForKeys";

      public static final String ARG_LQMG_CONFIG_XML = "configurationXML";

      public static final String ARG_OUTPUT_FOLDER = "outputFolder";

      public static final String ARG_PACKAGES = "packages";

      private static String evaluateMandatoryOptionValue(final String key,
          final CommandLine commandLine,
          final Options options) {
        String result = commandLine.getOptionValue(key);
        if (result == null) {
          LQMGMain.printHelp(options);
          IllegalArgumentException e =
              new IllegalArgumentException("Missing mandatory argument: " + key);
          e.setStackTrace(new StackTraceElement[0]);
          throw e;
        }
        return result;
      }

      /**
       * The command line processor.
       *
       * @param args
       *          the arguments.
       */
      public static void main(final String[] args) {
        Options options = new Options();
        options.addOption("b", ARG_BUNDLES, true, "Location to the bundles separated by semicolon");
        options.addOption("p", ARG_PACKAGES, true,
            "Package names separated by comma that should be generated."
                + " If not defined, all packages will be generated.");
        options.addOption("cp", ARG_CAPABILITY, true,
            "Expression that is used to select the first capability based on the"
                + " capabilities that are provided by the bundles.");
        options.addOption("o", ARG_OUTPUT_FOLDER, true, "Path of the folder where the classes should be"
            + " generated");
        options.addOption("c", ARG_LQMG_CONFIG_XML, true,
            "Path of an optional configuration XML that can override"
                + " configurations coming from the capabilities");
        options.addOption("h", ARG_HACK_WIRES, true,
            "Whether to try redeploy bundles with unsatisfied constraintsin"
                + " the way that their requirements are changed to be optional. Default: true");
        options.addOption("h", ARG_INNER_CLASSES_FOR_KEYS, true,
            "Whether to generate inner classes for constraints. Default: true");
        options.addOption("ds", ARG_DEFAULT_SCHEMA, true,
            "Default schema where tables will be generated. This schema will be passed in the "
                + "constructor of the generated metadata classes where the liquibase changelog file "
                + "does not contain schema information. It is recommended to define a unique value "
                + "and use the runtime schema renaming functionality of QueryDSL.");

        CommandLineParser commandLineParser = new BasicParser();
        CommandLine commandLine;
        try {
          commandLine = commandLineParser.parse(options, args, true);
        } catch (ParseException e) {
          LQMGMain.printHelp(options);
          RuntimeException returnE = new RuntimeException(e);
          returnE.setStackTrace(new StackTraceElement[0]);
          throw returnE;
        }

        String outputFolder =
            LQMGMain.evaluateMandatoryOptionValue(ARG_OUTPUT_FOLDER, commandLine, options);
        String bundles = LQMGMain.evaluateMandatoryOptionValue(ARG_BUNDLES, commandLine, options);
        String changelog = LQMGMain.evaluateMandatoryOptionValue(ARG_CAPABILITY, commandLine, options);
        String packages = commandLine.getOptionValue(ARG_PACKAGES);
        String configurationXMLPath = commandLine.getOptionValue(ARG_LQMG_CONFIG_XML);
        String hackWires = commandLine.getOptionValue(ARG_HACK_WIRES);
        String innerClassesForKeys = commandLine.getOptionValue(ARG_INNER_CLASSES_FOR_KEYS);
        String defaultSchema = commandLine.getOptionValue(ARG_DEFAULT_SCHEMA);

        GenerationProperties generationProps =
            new GenerationProperties(changelog, bundles.split("\\;"), outputFolder);

        generationProps.setConfigurationPath(configurationXMLPath);
        generationProps.setDefaultSchema(defaultSchema);

        if (packages != null) {
          generationProps.setPackages(packages.split("\\,"));
        }

        if (hackWires != null) {
          generationProps.setHackWires(Boolean.valueOf(hackWires));
        }

        if (innerClassesForKeys != null) {
          generationProps.setHackWires(Boolean.valueOf(innerClassesForKeys));
        }

        LQMG.generate(generationProps);
      }

      private static void printHelp(final Options options) {
        HelpFormatter helperFormatter = new HelpFormatter();
        helperFormatter.printHelp("java -jar lqmg.jar", options);
      }

      private LQMGMain() {
      }

    }