package org.maltparser.core.options.option;

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

/**
 * A boolean option is an option that can only contain a boolean value (true or
 * false).
 *
 * @author Johan Hall
 * @since 1.0
*
 */
public class BoolOption extends Option {

    private Boolean defaultValue;

    /**
     * Creates a boolean 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.
     * @param defaultValue	a default value string (true or false).
     * @throws OptionException
     */
    public BoolOption(OptionGroup group,
            String name,
            String shortDescription,
            String flag,
            String usage,
            String defaultValue) throws MaltChainedException {
        super(group, name, shortDescription, flag, usage);
        setDefaultValue(defaultValue);
    }

    /*
     * (non-Javadoc) @see
     * org.maltparser.core.options.option.Option#getValueObject(java.lang.String)
     */
    public Object getValueObject(String value) throws MaltChainedException {
        if (value.equalsIgnoreCase("true")) {
            return true;
        } else if (value.equalsIgnoreCase("false")) {
            return false;
        } else {
            throw new OptionException("Illegal boolean value '" + value + "' for the '" + getName() + "' option. ");
        }
    }

    public Object getDefaultValueObject() throws MaltChainedException {
        return defaultValue;
    }

    public void setDefaultValue(String defaultValue) throws MaltChainedException {
        if (defaultValue.equalsIgnoreCase("true")) {
            this.defaultValue = true;
        } else if (defaultValue.equalsIgnoreCase("false")) {
            this.defaultValue = false;
        } else {
            throw new OptionException("Illegal boolean default value '" + defaultValue + "' for the '" + getName() + "' option. ");
        }
    }

    public String getDefaultValueString() {
        return defaultValue.toString();
    }

    public String getStringRepresentation(Object value) {
        if (value instanceof Boolean) {
            return value.toString();
        }
        return null;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append(super.toString());
        sb.append("-----------------------------------------------------------------------------\n");
        return sb.toString();
    }
}