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This library provides an easy way to add auto complete functionality to any JTextComponent.

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package com.swingautocompletion.main;

/*
 * #%L
 * SwingAutoCompletion
 * %%
 * Copyright (C) 2013 - 2014 SwingAutoComplete
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import java.util.ArrayList;
import java.util.List;

/**
 * @author parmstrong
 */
public class LinearSearch implements SearchStrategy
{
	@Override
	public List search(String wordPart, List items)
	{
		List suggestions = new ArrayList();
		for (AutoCompleteItem autoCompleteItem : items)
		{
			if (autoCompleteItem.getAutoCompleteId().toLowerCase().startsWith(wordPart.toLowerCase()))
				suggestions.add(autoCompleteItem);
			else
			{
				for (String alternateId : autoCompleteItem.alternateAutoCompeteIds())
				{
					if (alternateId.toLowerCase().startsWith(wordPart.toLowerCase()))
					{
						suggestions.add(autoCompleteItem);
						break;
					}
				}
			}
		}
		return suggestions;
	}
}