package org.maltparser.core.options.option;

import org.maltparser.core.exception.MaltChainedException;
import org.maltparser.core.options.OptionException;
import org.maltparser.core.options.OptionGroup;

/**
 * An unary option is an option that doesn't need a value to the specified. For
 * example the --system-help option (-h or --help).
 *
 * @author Johan Hall
 * @since 1.0
*
 */
public class UnaryOption extends Option {

    /**
     * Creates an unary option description
     *
     * @param group	a reference to the option group.
     * @param name	the name of the option.
     * @param shortDescription	a short description of the option.
     * @param flag	a short string that can be used in the command line.
     * @param usage	a string that explains the usage of the option.
     * @throws OptionException
     */
    public UnaryOption(OptionGroup group,
            String name,
            String shortDescription,
            String flag,
            String usage) throws MaltChainedException {
        super(group, name, shortDescription, flag, usage);
    }

    /*
     * (non-Javadoc) @see
     * org.maltparser.core.options.option.Option#getValueObject(java.lang.String)
     */
    public Object getValueObject(String value) throws MaltChainedException {
        if (value.equalsIgnoreCase("used")) {
            return true;
        }
        return null;
    }

    /*
     * (non-Javadoc) @see
     * org.maltparser.core.options.option.Option#getDefaultValueObject()
     */
    public Object getDefaultValueObject() throws MaltChainedException {
        return null;
    }

    /*
     * (non-Javadoc) @see
     * org.maltparser.core.options.option.Option#getDefaultValueString()
     */
    public String getDefaultValueString() {
        return null;
    }

    /*
     * (non-Javadoc) @see
     * org.maltparser.core.options.option.Option#getStringRepresentation(java.lang.Object)
     */
    public String getStringRepresentation(Object value) {
        return null;
    }

    /*
     * (non-Javadoc) @see
     * org.maltparser.core.options.option.Option#setDefaultValue(java.lang.String)
     */
    public void setDefaultValue(String defaultValue) throws MaltChainedException {
    }

    /*
     * (non-Javadoc) @see org.maltparser.core.options.option.Option#toString()
     */
    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append(super.toString());
        sb.append("-----------------------------------------------------------------------------\n");
        return sb.toString();
    }
}