treefactory.java

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/*
 * ====================================================================
 * The JSP Tree Software License, Version 1.1
 *
 * (this license is derived and fully compatible with the Apache Software
 * License - see http://www.apache.org/LICENSE.txt)
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 * Copyright (c) 2002-2005 jsptree.sourceforge.net . All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *       "This product includes software developed by
 *        jsptree.sourceforge.net (http://jsptree.sourceforge.net/)."
 *    Alternately, this acknowledgment may appear in the software itself,
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 * ====================================================================
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package net.sf.jsptree.tree;

/**
 * Represents a TreeFactory for building {@link TreeStructureModel} instances.
 * All of the trees it returns have a common {@link TreeStructureModel} interface.
 * The <i>Factory</i> class, which implements this interface  usually is a
 * <i>Singleton</i>, since it needs to keep track of whether or not a
 * particular {@link Tree} instance has been generated yet. It will
 * give an opportunity to such <i>Factory</i> not to build tree
 * instance each time it is requested, but use <i>Cloneable</i> mechanism
 * of <code>Tree</code> instead.
 *
 * @author Vladislav Kamensky
 */
public interface TreeFactory {

    /**
     * Returns new <code>TreeStructureModel</code> instance by its name.
     *
     * @param p_name The name of the tree to be built.
     * @throws TreeFactoryException in case of tree with the given
     *                              name can not be built
     */
    TreeStructureModel getTree(String p_name) throws TreeFactoryException;

    /**
     * Returns new <code>TreeStateModel</code> instance by its name.
     *
     * @param p_name The name of the tree.
     * @throws TreeFactoryException in case of tree with the given
     *                              name can not be built.
     */
    TreeStateModel getTreeStates(String p_name) throws TreeFactoryException;
}