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Generic support library for web applications.
There is a newer version: 1.22
/*
 * Copyright (c) 2017, Numdata BV, The Netherlands.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Numdata nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NUMDATA BV BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.numdata.oss.web.form;

import java.util.*;

import org.jetbrains.annotations.*;

/**
 * Provides access to a property stored in a {@link Map} object.
 *
 * @author G. Meinders
 */
public class MapTarget
implements FieldTarget
{
	/**
	 * Target {@link Map}.
	 */
	@NotNull
	private final Map _map;

	/**
	 * Key in map.
	 */
	@NotNull
	private final String _key;

	/**
	 * Name of form field.
	 */
	@NotNull
	private final String _name;

	/**
	 * Construct new map field target.
	 *
	 * @param map  Target map.
	 * @param name Name of property.
	 */
	public MapTarget( @NotNull final Map map, @NotNull final String name )
	{
		this( name, map, name );
	}

	/**
	 * Construct new map field target.
	 *
	 * @param name Name of property.
	 * @param map  Target map.
	 * @param key  Key in map.
	 */
	@SuppressWarnings( "AssignmentToCollectionOrArrayFieldFromParameter" )
	public MapTarget( @NotNull final String name, @NotNull final Map map, @NotNull final String key )
	{
		_map = map;
		_key = key;
		_name = name;
	}

	@NotNull
	@Override
	public String getName()
	{
		return _name;
	}

	@Nullable
	@Override
	public String getValue()
	{
		final Object value = _map.get( _key );
		return ( value == null ) ? null : String.valueOf( value );
	}

	@Override
	public void setValue( @Nullable final String value )
	{
		if ( value == null )
		{
			_map.remove( _key );
		}
		else
		{
			_map.put( _key, value );
		}
	}
}