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    <title>Classe Library</title>
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<h1>Class Library</h1>

<p> O ponto de acesso para uma biblioteca JAR é uma classe derivada que estende a
classe original <code> Library </code>. O trabalho principal da biblioteca é
listar as ferramentas que estão disponíveis através da biblioteca, na maioria das vezes,
as ferramentas são todas aquelas necessárias para se adicionar os vários componentes
definidos - ou seja, instâncias da classe <code> AddTool </code> ao se trabalhar
com  diferentes fábricas de componentes.
</p>

<h2>Components</h2>

<pre>
package com.cburch.gray;

import java.util.Arrays;
import java.util.List;

import com.cburch.logisim.tools.AddTool;
import com.cburch.logisim.tools.Library;

/** The library of components that the user can access. */
public class Components extends Library {
    /** The list of all tools contained in this library. Technically,
     * libraries contain tools, which is a slightly more general concept
     * than components; practically speaking, though, you'll most often want
     * to create AddTools for new components that can be added into the circuit.
     */
    private List&lt;AddTool&gt; tools;
    
    /** Constructs an instance of this library. This constructor is how
     * Logisim accesses first when it opens the JAR file: It looks for
     * a no-arguments constructor method of the user-designated class.
     */
    public Components() {
        tools = Arrays.asList(new AddTool[] {
                new AddTool(new GrayIncrementer()),
                new AddTool(new SimpleGrayCounter()),
                new AddTool(new GrayCounter()),
        });
    }
    
    /** Returns the name of the library that the user will see. */ 
    public String getDisplayName() {
        return "Gray Tools";
    }
    
    /** Returns a list of all the tools available in this library. */
    public List&lt;AddTool&gt; getTools() {
        return tools;
    }
}
</pre>

<p><strong>Próximo:</strong> <a href="simpctr.html">Contador simples em código de Gray</a>.</p>

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