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contributor license agreements.  See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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.
/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.cli;

import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

A group of mutually exclusive options.
Version:
$Id: OptionGroup.java 1749596 2016-06-21 20:27:06Z britter $/**
 * A group of mutually exclusive options.
 *
 * @version $Id: OptionGroup.java 1749596 2016-06-21 20:27:06Z britter $
 */
public class OptionGroup implements Serializable
{
    
The serial version UID. /** The serial version UID. */
    private static final long serialVersionUID = 1L;
    
    
hold the options /** hold the options */
    private final Map<String, Option> optionMap = new LinkedHashMap<String, Option>();

    
the name of the selected option /** the name of the selected option */
    private String selected;

    
specified whether this group is required /** specified whether this group is required */
    private boolean required;

    
Add the specified Option to this group.
Params:
option – the option to add to this group
Returns:
this option group with the option added/**
     * Add the specified <code>Option</code> to this group.
     *
     * @param option the option to add to this group
     * @return this option group with the option added
     */
    public OptionGroup addOption(Option option)
    {
        // key   - option name
        // value - the option
        optionMap.put(option.getKey(), option);

        return this;
    }

    
Returns:
the names of the options in this group as a 
Collection/**
     * @return the names of the options in this group as a 
     * <code>Collection</code>
     */
    public Collection<String> getNames()
    {
        // the key set is the collection of names
        return optionMap.keySet();
    }

    
Returns:
the options in this group as a Collection/**
     * @return the options in this group as a <code>Collection</code>
     */
    public Collection<Option> getOptions()
    {
        // the values are the collection of options
        return optionMap.values();
    }

    
Set the selected option of this group to name.
Params:
option – the option that is selected
Throws:
AlreadySelectedException – if an option from this group has 
already been selected./**
     * Set the selected option of this group to <code>name</code>.
     *
     * @param option the option that is selected
     * @throws AlreadySelectedException if an option from this group has 
     * already been selected.
     */
    public void setSelected(Option option) throws AlreadySelectedException
    {
        if (option == null)
        {
            // reset the option previously selected
            selected = null;
            return;
        }
        
        // if no option has already been selected or the 
        // same option is being reselected then set the
        // selected member variable
        if (selected == null || selected.equals(option.getKey()))
        {
            selected = option.getKey();
        }
        else
        {
            throw new AlreadySelectedException(this, option);
        }
    }

    
Returns:
the selected option name/**
     * @return the selected option name
     */
    public String getSelected()
    {
        return selected;
    }

    
Params:
required – specifies if this group is required/**
     * @param required specifies if this group is required
     */
    public void setRequired(boolean required)
    {
        this.required = required;
    }

    
Returns whether this option group is required.
Returns:
whether this option group is required/**
     * Returns whether this option group is required.
     *
     * @return whether this option group is required
     */
    public boolean isRequired()
    {
        return required;
    }

    
Returns the stringified version of this OptionGroup.
Returns:
the stringified representation of this group/**
     * Returns the stringified version of this OptionGroup.
     * 
     * @return the stringified representation of this group
     */
    @Override
    public String toString()
    {
        StringBuilder buff = new StringBuilder();
        
        Iterator<Option> iter = getOptions().iterator();

        buff.append("[");

        while (iter.hasNext())
        {
            Option option = iter.next();

            if (option.getOpt() != null)
            {
                buff.append("-");
                buff.append(option.getOpt());
            }
            else
            {
                buff.append("--");
                buff.append(option.getLongOpt());
            }
            
            if (option.getDescription() != null)
            {
                buff.append(" ");
                buff.append(option.getDescription());
            }
            
            if (iter.hasNext())
            {
                buff.append(", ");
            }
        }

        buff.append("]");

        return buff.toString();
    }
}