com.opsbears.webcomponents.configuration.ArgvConfigurationLoader Maven / Gradle / Ivy

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Utilities for creating and reading configuration options
There is a newer version: 1.0.0-alpha14
package com.opsbears.webcomponents.configuration;

import javax.annotation.ParametersAreNonnullByDefault;
import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Pattern;

@ParametersAreNonnullByDefault
public class ArgvConfigurationLoader implements ConfigurationLoader {
    private final static Pattern shortArgumentPattern = Pattern.compile("\\A-[a-zA-Z0-9]\\Z");
    private final static Pattern longArgumentPattern = Pattern.compile("\\A--[a-zA-Z0-9]+((-[a-zA-Z0-9]+)*)\\Z");

    private final String[] argv;

    public ArgvConfigurationLoader(String[] argv) {
        this.argv = argv;
    }

    @Override
    public String getName() {
        return "Command line arguments";
    }

    @Override
    public String getDescription() {
        return "Pass any arguments after the name of the JAR file of this application.";
    }

    @Override
    public String formatConfigurationOption(ConfigurationOption option) {
        return "--" + option.getLongOption().toLowerCase() + (option.getValueType().equals(Boolean.class)?"":" VALUE");
    }

    @Override
    public Configuration load(Configuration configuration) throws InvalidParameterException, ConfigurationOptionNotFound {
        List argvList = new ArrayList<>(Arrays.asList(argv));

        while (argvList.size() > 0) {
            String parameter = argvList.get(0);
            ConfigurationOption option;
            if (longArgumentPattern.matcher(parameter).matches()) {
                parameter = parameter.replaceAll("\\A--", "");
                option = configuration.getOption(parameter);

                //noinspection unchecked
                if (option.getValueType().isAssignableFrom(Boolean.class)) {
                    configuration = configuration.withOptionValue(parameter, true);
                    argvList.remove(0);
                } else {
                    configuration = configuration.withOptionValue(parameter, argvList.get(1));
                    argvList.remove(0);
                    argvList.remove(0);
                }
            } else if (shortArgumentPattern.matcher(parameter).matches()) {
                parameter = parameter.replaceAll("\\A-", "");
                option = configuration.getOptionByShortOption(parameter);

                //noinspection unchecked
                if (option.getValueType().isAssignableFrom(Boolean.class)) {
                    configuration = configuration.withShortOptionValue(parameter, true);
                    argvList.remove(0);
                } else {
                    configuration = configuration.withShortOptionValue(parameter, argvList.get(1));
                    argvList.remove(0);
                    argvList.remove(0);
                }
            } else {
                throw new InvalidParameterException(parameter);
            }
        }

        for (ConfigurationOptionGroupWithValues optionGroup : configuration.getConfigurationOptionGroups()) {
            for (ConfigurationOptionWithValue option : optionGroup.getOptions()) {
                if (option.getValueWithoutDefault() == null) {
                    configuration = configuration.withOptionValue(option.getLongOption(), false);
                }
            }
        }
        return configuration;
    }
}