NullTreeCheckingModel.java

/*
 * Copyright 2007-2010 Enrico Boldrini, Lorenzo Bigagli This file is part of
 * CheckboxTree. CheckboxTree is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version. CheckboxTree is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details. You should have received a copy of the GNU
 * General Public License along with CheckboxTree; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */
package it.cnr.imaa.essi.lablib.gui.checkboxtree;

import javax.swing.tree.TreePath;

/**
 * Convenience class representing an empty tree checking model (cf. the Null
 * Object pattern), whose paths are always enabled, unchecked and ungreyed. This
 * class is a singleton.
 * @author Lorenzo Bigagli
 */
public class NullTreeCheckingModel implements TreeCheckingModel {

	private final static NullTreeCheckingModel singleton;

	static {
		singleton = new NullTreeCheckingModel();
	}

	private NullTreeCheckingModel() {
	}

	public static NullTreeCheckingModel getInstance() {
		return singleton;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#addCheckingPath
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public void addCheckingPath(TreePath path) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#addCheckingPaths
	 * (javax.swing.tree.TreePath[])
	 */
	@Override
	public void addCheckingPaths(TreePath[] paths) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#
	 * addTreeCheckingListener
	 * (it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingListener)
	 */
	@Override
	public void addTreeCheckingListener(TreeCheckingListener tcl) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#clearChecking
	 * ()
	 */
	@Override
	public void clearChecking() {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#getCheckingMode
	 * ()
	 */
	@Override
	public CheckingMode getCheckingMode() {
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#getCheckingPaths
	 * ()
	 */
	@Override
	public TreePath[] getCheckingPaths() {
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#getCheckingRoots
	 * ()
	 */
	@Override
	public TreePath[] getCheckingRoots() {
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#getGreyingPaths
	 * ()
	 */
	@Override
	public TreePath[] getGreyingPaths() {
		return null;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#isPathChecked
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public boolean isPathChecked(TreePath path) {
		return false;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#isPathEnabled
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public boolean isPathEnabled(TreePath path) {
		return true;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#isPathGreyed
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public boolean isPathGreyed(TreePath path) {
		return false;
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#removeCheckingPath
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public void removeCheckingPath(TreePath path) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#
	 * removeCheckingPaths(javax.swing.tree.TreePath[])
	 */
	@Override
	public void removeCheckingPaths(TreePath[] paths) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @seeit.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#
	 * removeTreeCheckingListener
	 * (it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingListener)
	 */
	@Override
	public void removeTreeCheckingListener(TreeCheckingListener tcl) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#setCheckingMode
	 * (it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel.CheckingMode)
	 */
	@Override
	public void setCheckingMode(CheckingMode mode) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#setCheckingPath
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public void setCheckingPath(TreePath path) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#setCheckingPaths
	 * (javax.swing.tree.TreePath[])
	 */
	@Override
	public void setCheckingPaths(TreePath[] paths) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#setPathEnabled
	 * (javax.swing.tree.TreePath, boolean)
	 */
	@Override
	public void setPathEnabled(TreePath path, boolean enable) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#setPathsEnabled
	 * (javax.swing.tree.TreePath[], boolean)
	 */
	@Override
	public void setPathsEnabled(TreePath[] paths, boolean enable) {
		// nothing to do (cf. the Null Object pattern)
	}

	/*
	 * (non-Javadoc)
	 * @see
	 * it.cnr.imaa.essi.lablib.gui.checkboxtree.TreeCheckingModel#toggleCheckingPath
	 * (javax.swing.tree.TreePath)
	 */
	@Override
	public void toggleCheckingPath(TreePath pathForRow) {
		// nothing to do (cf. the Null Object pattern)
	}

}