SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package net.multiphasicapps.classfile;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;

/**
 * This holds the name and type strings, the type descriptor is not checked.
 *
 * @since 2017/06/12
 */
public final class NameAndType
{
    /** The name. */
    protected final String name;
    
    /** The type. */
    protected final String type;
    
    /** String representation. */
    private Reference<String> _string;
    
    /**
     * Initializes the name and type information.
     *
     * @param __n The name.
     * @param __t The type.
     * @throws NullPointerException On null arguments.
     * @since 2017/06/12
     */
    public NameAndType(String __n, String __t)
        throws NullPointerException
    {
        // Check
        if (__n == null || __t == null)
            throw new NullPointerException("NARG");
        
        // Set
        this.name = __n;
        this.type = __t;
    }
    
    /**
     * {@inheritDoc}
     * @since 2017/06/12
     */
    @Override
    public boolean equals(Object __o)
    {
        // Check
        if (!(__o instanceof NameAndType))
            return false;
        
        NameAndType o = (NameAndType)__o;
        return this.name.equals(o.name) &&
            this.type.equals(o.type);
    }
    
    /**
     * {@inheritDoc}
     * @since 2017/06/12
     */
    @Override
    public int hashCode()
    {
        return this.name.hashCode() ^ this.type.hashCode();
    }
    
    /**
     * Returns the identifier.
     *
     * @return The identifier.
     * @since 2017/06/12
     */
    public String name()
    {
        return this.name;
    }
    
    /**
     * {@inheritDoc}
     * @since 2017/06/12
     */
    @Override
    public String toString()
    {
        Reference<String> ref = this._string;
        String rv;
        
        // Cache?
        if (ref == null || null == (rv = ref.get()))
            this._string = new WeakReference<>((rv = this.name + "." +
                this.type));
        
        return rv;
    }
    
    /**
     * Returns the type.
     *
     * @return The type.
     * @since 2017/06/12
     */
    public String type()
    {
        return this.type;
    }
}