com.deploymentio.cfnstacker.StackerOptions.java Source code

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Here is the source code for com.deploymentio.cfnstacker.StackerOptions.java

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/*
 * Copyright 2016 - Deployment IO
 *
 * 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 com.deploymentio.cfnstacker;

import java.io.File;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.lang3.StringUtils;

import com.deploymentio.cfnstacker.config.StackConfig;
import com.deploymentio.cfnstacker.config.StackConfigCreator;

public class StackerOptions {

    protected PrintWriter usageWriter = new PrintWriter(System.err);

    private boolean debugEnabled;
    private boolean traceEnabled;

    private Action desiredAction;
    private File configFile;
    private StackConfig stackConfig;
    private List<String> errors = new ArrayList<>();

    public StackerOptions(String[] args) {

        Options options = new Options();
        options.addOption(Option.builder("c").desc("Stack configuration file").longOpt("config").hasArg()
                .argName("file").type(File.class).required().build());
        options.addOption(Option.builder("a").desc("Action to take").longOpt("action").hasArg().argName("name")
                .required().build());
        options.addOption(Option.builder("d").desc("Print debug messages").longOpt("debug").build());
        options.addOption(Option.builder("t").desc("Print trace messages").longOpt("trace").build());

        String desiredActionValue = null;

        CommandLineParser parser = new DefaultParser();
        CommandLine commandLine = null;
        try {
            commandLine = parser.parse(options, args);

            desiredActionValue = commandLine.getOptionValue("action");
            configFile = (File) commandLine.getParsedOptionValue("config");
            debugEnabled = commandLine.hasOption("debug");
            traceEnabled = commandLine.hasOption("trace");

        } catch (ParseException e) {
            errors.add("Invalid or missing arguments, see usage message");
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp(usageWriter, 100,
                    "java -jar cfn-stacker.jar -c <file> -a <" + StringUtils.join(Action.values(), '|') + ">",
                    "\nCFN Stacker is used to create/update/delete an AWS CloudFormation stack\n", options, 3, 3,
                    "");
            usageWriter.append('\n').flush();
        }

        if (!hasErrors()) {

            if (!configFile.exists() || !configFile.isFile()) {
                errors.add("Config file doesn't exist: Path=" + configFile.getAbsolutePath());
            } else {
                try {
                    stackConfig = new StackConfigCreator(configFile).getStackConfig();
                } catch (Exception e) {
                    errors.add("Can't load stack configuration: File=" + configFile.getAbsolutePath() + " Error="
                            + e.getClass().getName() + " ErrorMessage=" + e.getMessage());
                }
            }

            try {
                desiredAction = Action.valueOf(desiredActionValue);
            } catch (IllegalArgumentException e) {
                errors.add("Action is not valid: Found=" + desiredActionValue + " Expected="
                        + StringUtils.join(Action.values(), '|'));
            }
        }
    }

    public List<String> getErrors() {
        return errors;
    }

    public boolean hasErrors() {
        return !errors.isEmpty();
    }

    public Action getDesiredAction() {
        return desiredAction;
    }

    public File getConfigFile() {
        return configFile;
    }

    public boolean isDebugEnabled() {
        return debugEnabled;
    }

    public boolean isTraceEnabled() {
        return traceEnabled;
    }

    public StackConfig getStackConfig() {
        return stackConfig;
    }
}